CN111812205B - Full-focusing and phased array double-scanning imaging method - Google Patents
Full-focusing and phased array double-scanning imaging method Download PDFInfo
- Publication number
- CN111812205B CN111812205B CN202010562565.4A CN202010562565A CN111812205B CN 111812205 B CN111812205 B CN 111812205B CN 202010562565 A CN202010562565 A CN 202010562565A CN 111812205 B CN111812205 B CN 111812205B
- Authority
- CN
- China
- Prior art keywords
- imaging
- full
- period
- phased array
- focus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 242
- 238000005070 sampling Methods 0.000 claims description 37
- 238000001514 detection method Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 35
- 230000005284 excitation Effects 0.000 claims description 32
- 239000011159 matrix material Substances 0.000 claims description 16
- 238000010586 diagram Methods 0.000 claims description 10
- 230000009977 dual effect Effects 0.000 claims description 9
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 description 30
- 230000007547 defect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 241001522296 Erithacus rubecula Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4472—Mathematical theories or simulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/106—Number of transducers one or more transducer arrays
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Mathematical Optimization (AREA)
- Signal Processing (AREA)
- Engineering & Computer Science (AREA)
- Pure & Applied Mathematics (AREA)
- Mathematical Physics (AREA)
- Mathematical Analysis (AREA)
- Algebra (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention provides a full-focusing and phased array double-scanning imaging method, which is characterized in that when phased array and full-focusing double-scanning imaging are carried out, the control of a transmitting and receiving module of the phased array and the focusing imaging processing are simultaneously carried out in parallel in the full-focusing imaging time period, so that the mutual interference of two modes is avoided, the normal operation of the two imaging modes is ensured, the imaging frame rate of the whole system is effectively improved, and the real-time requirement in practical application is met.
Description
Technical Field
The invention relates to the technical field of ultrasonic detection, in particular to a full-focusing and phased array double-scanning imaging method.
Background
Ultrasonic detection technology is a common method in the field of industrial nondestructive detection, and is widely applied to practical ultrasonic detection. The ultrasonic phased array detection imaging technology is composed of a plurality of pieces of A-scan data, and on different A-scan data processing, the collection and deflection of the A-scan ultrasonic sound beam are realized by controlling the transmitting time delay and the receiving time delay of pulse signals of each array element, and a frame of B-scan or C-scan image is composed of a plurality of pieces of A-scan data. The ultrasonic phased array detection imaging technology has the advantages of being rapid, accurate, high in adaptability and the like, and the obtained image frame rate is high.
However, the ultrasonic phased array can only perform single-point focusing scanning detection on each piece of A scanning data, and has a defect in detection precision and accuracy. The ultrasonic full-focus imaging technology is an ultrasonic nondestructive testing technology which is rising in recent years. The ultrasonic full-focusing imaging technology can focus and image any plurality of points in any region in the object to be detected, and has high detection precision and more accurate defect characterization. However, the full-focus imaging technology needs to perform focus operation processing on the image point by point, the more imaging points are, the more complex the operation is, the longer the time required for full-focus imaging is, and the lower the imaging frame rate is.
The existing ultrasonic detection equipment is often provided with an ultrasonic phased array imaging function and a full-focus imaging function, because the ultrasonic phased array detection imaging technology can excite all array elements simultaneously to carry out ultrasonic emission, and the ultrasonic full-focus imaging technology excites a single array element each time, in some cases, if the internal defects of a thicker object are detected, the signal to noise ratio of defect echo signals of the ultrasonic phased array detection imaging technology can be better, so in practical application, in order to clearly and accurately obtain imaging images of all defects in the detected object, the ultrasonic phased array detection imaging technology and the ultrasonic full-focus imaging technology are simultaneously used for scanning and detecting the detected object, during scanning, phased array scanning and detecting are carried out sequentially in time to obtain a frame of phased array defect image, then full-focus scanning and detecting are carried out to obtain a frame of full-focus defect image, and the steps are repeated as shown in an attached figure 3. Two defect imaging diagrams can be obtained in real time during scanning, but because the two detection imaging technologies are used for scanning simultaneously, the imaging frame rate of the whole system can be greatly reduced, and the real-time requirement of practical application is difficult to meet.
Disclosure of Invention
The embodiment of the invention provides a full-focus and phased array double-scanning imaging method to solve the technical problems, so that the imaging frame rate of a system can be improved when full-focus scanning imaging and phased array scanning imaging are simultaneously carried out, and the real-time requirement in practical application is met.
In order to solve the technical problems, the embodiment of the invention provides a full-focusing and phased array double-scanning imaging method, which comprises the following steps:
s1, dividing imaging time into a plurality of full-focus frame periods according to a preset detection range, a preset full-focus imaging resolution and a preset imaging frame rate, and dividing each full-focus frame period into N internal synchronization periods, wherein each internal synchronization period comprises a sampling time period tc and an imaging processing time period tp;
s2, generating a full-focus image G1 according to the preset full-focus imaging resolution, generating a phased array image P according to the preset number T of data required by phased array imaging and the sampling point number r of each data, initializing all pixel values in the full-focus image G1 and the phased array image P to 0, calculating the maximum number m=tp/tc of data capable of completing processing A scanning in the imaging processing time period tp, dividing the imaging processing time period tp into m A scanning periods, and setting an identification number for each A scanning period in sequence; then executing the step S3 and the step S4 in parallel;
s3, in a sampling time period of an ith internal synchronous period of a current full-focus imaging frame period, operating a full-focus array element control mode to perform ultrasonic excitation, and storing received echo signals; in the imaging processing time period of the ith internal synchronization period, performing full-focusing operation imaging processing on the echo signal to obtain a focusing image Gi after ultrasonic excitation of the first i array elements; repeatedly executing the step S3 until i is equal to N, and executing the step S5;
s4, in an imaging processing time period of an ith internal synchronization period of a current full-focus imaging frame period, operating a phased array element control mode to perform ultrasonic excitation, performing array element ultrasonic excitation and ultrasonic signal reception according to phased array parameters corresponding to each A-scan period in the current imaging processing time period, performing phased array focusing processing on the received ultrasonic signals to obtain m pieces of A-scan data, storing the m pieces of A-scan data into a column corresponding to an A-scan period identification number in the phased array image P, and sequentially setting identification numbers for m A-scan periods of a next internal synchronization period based on the A-scan period identification number extending the last internal synchronization period; repeatedly executing the step S4 until the identification number of the current phased array A scanning period is equal to T, and executing the step S6;
s5, in an imaging processing time period of an N-th internal synchronization period of a current full-focus imaging frame period, carrying out full-focus operation on echo signals received after ultrasonic excitation on N array elements to obtain a full-focus image GN of the current frame; returning to the execution step S3 to process the next full-focus imaging frame period until the last full-focus imaging frame period is completed;
s6, when the identification number of the phased array A scanning period is T, performing array element ultrasonic excitation and ultrasonic signal reception according to phased array parameters of the T-th phased array A scanning data in the current imaging processing time period, performing phased array focusing processing to obtain the T-th A scanning data AT, storing the A scanning data AT in a T-th column in the phased array focusing diagram P to obtain a phased array image P of the current frame, and then setting the identification number for m A scanning periods of the next internal synchronization period in sequence; and returning to the execution step S4 to process the next phased array frame period until the process of the last phased array frame period is completed.
Further, the imaging processing period tp=c×v×b; wherein c is the number of rows of the preset full-focus imaging resolution, v is the number of columns of the preset full-focus imaging resolution, and b is the time for focusing each pixel by the system.
Further, the sampling period tc= 2*L/V; wherein L represents the preset detection range, and V represents the ultrasonic sound velocity.
Further, after the full-focus imaging process is performed, the full-matrix data stored in the current internal synchronization period is cleared.
Compared with the prior art, the invention has the following beneficial effects:
the embodiment of the invention provides a full-focusing and phased array double-scanning imaging method, which can simultaneously control a transmitting and receiving module of a phased array and focus imaging processing in parallel in a full-focusing imaging time period when phased array and full-focusing double-scanning imaging are carried out, so that the mutual interference of two modes is avoided, the normal operation of the two imaging modes is ensured, and the imaging frame rate of the whole system is effectively improved, thereby meeting the real-time requirement in practical application.
Drawings
FIG. 1 is a schematic diagram of a full focus imaging coordinate model according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the division of the full focus frame period and the inner synchronization period according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a conventional dual focus and phased array dual scan imaging procedure according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a full-focus array element control and a phased array element control principle according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the division of the internal synchronization period and the A-scan period according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a phased array and full focus dual scan imaging procedure according to one embodiment of the invention
Fig. 7 is a flow chart of a dual-scan imaging method of a full focus and phased array according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Note that the full focus imaging technique is to perform full matrix dataThe matrix is realized by virtual focusing imaging. Full matrix data generation process: the probe is provided with N array elements which are sequentially arranged as follows: array element 1, array element 2 once again. Exciting array element 1, N array elements receiving echo signals and storing as S 11 、S 12 、......、S 1N The method comprises the steps of carrying out a first treatment on the surface of the Exciting array element 2, N array elements receiving echo signals and storing as S 21 、S 22 、......、S 2N The method comprises the steps of carrying out a first treatment on the surface of the And so on until N array elements are excited, N multiplied by N A scanning data are received, and the data are full matrix data. By way of example, the imaging process is as follows: as shown in fig. 1, the lower small circle area is an imaging area, each small circle represents one pixel point, the imaging point img represents any one pixel point in the imaging area, (i, j) represents the coordinates of the point, where i=0, 1,2, & gt, m-1 represents the coordinates in the y-axis direction; j=0, 1,2,..n-1, represents the coordinates of the x-axis direction. P is the pixel point spacing, ds is the detection starting depth; d is the array element distance, N is the array element number, and the array element k and the array element p respectively represent the transmitting array element and the receiving array element, wherein the value ranges of k and p are 0, N-1]. The available transmit and receive strokes are respectively:
the calculation of the transmit and receive strokes varies from application to application, as just one example of an application calculation where the probe does not have a wedge.
The ultrasonic wave is emitted from the array element k, and the total sound path from the imaging point img (i, j) to the receiving array element p is as follows:
R(i,j,k,h)＝R(i,j,k)+R(i,j,h)；
the index position of the A-scan data corresponding to the total sound path is as follows:
where v refers to the propagation speed of ultrasonic waves in the object to be measured, and f refers to the clock frequency of array element sampling.
The pixel value of any imaging point is obtained by superposing the full matrix data S corresponding to the point:
and traversing and calculating to obtain all pixel values, obtaining an image, and finally processing, displaying and imaging by an upper computer.
It should be noted that, when the current ultrasonic detection device uses the ultrasonic phased array detection imaging technology and the ultrasonic full-focusing imaging technology to scan and detect the detected object, the imaging frame rate of the whole system is greatly reduced, and it is difficult to meet the real-time requirement of practical application.
This is because there is only one set of ultrasound excitation and reception modules on the ultrasound detection device, and phased array imaging techniques differ from full focus imaging techniques in the excitation and reception modes. The phased array imaging technology is that a plurality of array elements are excited simultaneously, and the transmitting time delay and the receiving time delay during excitation are set arbitrarily by a system; the full-focus imaging technology is single-array element excitation every time, and the emission time delay and the receiving time delay in excitation are 0, so that the phased array imaging technology is different from the full-focus imaging technology in ultrasonic excitation receiving control, and the ultrasonic excitation and receiving modules are multiplexed when the ultrasonic detection equipment simultaneously adopts the two technologies for detection, so that the respective imaging periods of the two detection imaging technologies are prolonged, and especially the full-focus imaging technology is complex in operation, and the imaging period is longer than that of the phased array, so that the imaging frame rate of the whole system is greatly reduced.
Based on the method, the invention provides a method, and when the ultrasonic phased array detection imaging technology and the ultrasonic full-focusing imaging technology are simultaneously used for scanning detection, the imaging frame rate of the whole system is improved, and the real-time requirement of the use site is met.
Referring to fig. 7, an embodiment of the present invention provides a method for dual scanning imaging of a full focus and a phased array, including the steps of:
s1, dividing imaging time into a plurality of full-focus frame periods according to a preset detection range, a preset full-focus imaging resolution and a preset imaging frame rate, and dividing each full-focus frame period into N internal synchronization periods, wherein each internal synchronization period comprises a sampling time period tc and an imaging processing time period tp;
s2, generating a full-focus image G1 according to the preset full-focus imaging resolution, generating a phased array image P according to the preset number T of data required by phased array imaging and the sampling point number r of each data, initializing all pixel values in the full-focus image G1 and the phased array image P to 0, calculating the maximum number m=tp/tc of data capable of completing processing A scanning in the imaging processing time period tp, dividing the imaging processing time period tp into m A scanning periods, and setting an identification number for each A scanning period in sequence; then executing the step S3 and the step S4 in parallel;
s3, in a sampling time period of an ith internal synchronous period of a current full-focus imaging frame period, operating a full-focus array element control mode to perform ultrasonic excitation, and storing received echo signals; in the imaging processing time period of the ith internal synchronization period, performing full-focusing operation imaging processing on the echo signal to obtain a focusing image Gi after ultrasonic excitation of the first i array elements; repeatedly executing the step S3 until i is equal to N, and executing the step S5;
s4, in an imaging processing time period of an ith internal synchronization period of a current full-focus imaging frame period, operating a phased array element control mode to perform ultrasonic excitation, performing array element ultrasonic excitation and ultrasonic signal reception according to phased array parameters corresponding to each A-scan period in the current imaging processing time period, performing phased array focusing processing on the received ultrasonic signals to obtain m pieces of A-scan data, storing the m pieces of A-scan data into a column corresponding to an A-scan period identification number in the phased array image P, and sequentially setting identification numbers for m A-scan periods of a next internal synchronization period based on the A-scan period identification number extending the last internal synchronization period; repeatedly executing the step S4 until the identification number of the current phased array A scanning period is equal to T, and executing the step S6;
s5, in an imaging processing time period of an N-th internal synchronization period of a current full-focus imaging frame period, carrying out full-focus operation on echo signals received after ultrasonic excitation on N array elements to obtain a full-focus image GN of the current frame; returning to the execution step S3 to process the next full-focus imaging frame period until the last full-focus imaging frame period is completed;
s6, when the identification number of the phased array A scanning period is T, performing array element ultrasonic excitation and ultrasonic signal reception according to phased array parameters of the T-th phased array A scanning data in the current imaging processing time period, performing phased array focusing processing to obtain the T-th A scanning data AT, storing the A scanning data AT in a T-th column in the phased array focusing diagram P to obtain a phased array image P of the current frame, and then setting the identification number for m A scanning periods of the next internal synchronization period in sequence; and returning to the execution step S4 to process the next phased array frame period until the process of the last phased array frame period is completed.
Further, the imaging processing period tp=c×v×b; wherein c is the number of rows of the preset full-focus imaging resolution, v is the number of columns of the preset full-focus imaging resolution, and b is the time for focusing each pixel by the system.
Further, the sampling period tc= 2*L/V; wherein L represents the preset detection range, and V represents the ultrasonic sound velocity.
Further, after the full-focus imaging process is performed, the full-matrix data stored in the current internal synchronization period is cleared.
Based on the above scheme, in order to better understand the full-focusing and phased array dual-scanning imaging method provided by the invention, the following is specifically described:
referring to fig. 2 and 4-6, the working procedure of the full focus and phased array dual scan imaging method is as follows:
1. initializing, namely dividing time into uniform full-focus frame periods according to a set detection range L, the size c, the row, the v and the column of the full-focus imaging resolution and an imaging frame rate F, dividing each full-focus frame period into N internal synchronization periods, and dividing each internal synchronization period into a sampling time period tc and an imaging processing time period tp.
In addition, initializing the internal synchronization period of the current full-focus imaging frame period to be the 1 st internal synchronization period to generate a full-focus image G of c rows and v columns 1 Will G 1 All pixel values within are initialized to 0.
Meanwhile, generating a phased array image P of r rows and q columns according to the total number T of the A-scan data required by the set phased array imaging and the sampling point number r of each piece of the A-scan data, and initializing all pixel values in the P to 0.
Calculating the maximum number m=tp/tc of the A-scan data which can be processed in the imaging processing time period of one internal synchronization period; the imaging processing time period is subdivided into m a-scan periods, and the identification numbers of the m a-scan periods in the 1 st internal synchronization period are initialized to 1,2, 3.
Thereafter, the process proceeds to step 2 and step 3 at the same time.
2. In the sampling time period of the ith inner synchronous period of the current full-focus imaging frame period, entering a full-focus array element control mode of a transmitting and receiving module (namely, the ith array element is subjected to ultrasonic excitation and N array elements are received), and storing the corresponding echo signals as S i1 、S i2 、......、S iN . During the imaging processing time period, the echo signal S i1 、S i2 、......、S iN Performing full-focusing operation imaging processing to obtain a focusing image G after ultrasonic excitation of the first i array elements i The method comprises the steps of carrying out a first treatment on the surface of the Step 4 is entered until i is equal to N.
3. In the imaging processing time period of the ith internal synchronization period of the current full-focus imaging frame period, entering a phased array element control mode of a transmitting and receiving module, respectively controlling ultrasonic excitation and ultrasonic signal reception of array elements according to phased array parameters corresponding to A-scan data when the A-scan period is the current identification number according to identification numbers k, k+1, and the number of the current m phased array A-scan periods, and performing phased array focusing processing to obtain current k-th to k+m-1-th A-scan data A k To A k+m-1 (A k Consists of L data, i.e. L sampling points for each A-scan data), and the A is determined k To A k+m-1 The data is stored in correspondence with columns k to k + m-1 of the phased array focus map P.
And simultaneously setting m A scanning period identification numbers of the next internal synchronization period as k+m, k+m+1, k+m+2.
And (3) repeating the step (3) until the identification number of the current phased array A scanning period is equal to T, and entering the step (5).
4. In the imaging processing time period of the N-th internal synchronization period of the full-focus imaging frame period, acquiring a full-focus image G after ultrasonic excitation of N array elements through full-focus operation N The G is N I.e. one frame of the output full-focus image. Returning to the step 2, repeating the next full focusing frame period processing.
5. When the identification number of the phased array A-scan period is T, performing ultrasonic excitation and ultrasonic signal reception of array elements according to parameters set by the current T-th phased array A-scan data, and performing phased array focusing processing to obtain the current T-th A-scan data A T And putting the A T The data is stored in the T-th column of the phased array focus map P, outputting a complete phased array image P of one frame. Meanwhile, m a-scan period identification numbers of the next internal synchronization period are set to 1,2, 3.
Then, returning to the step 3, the next phased array frame period processing is repeated. Until the processing of the last frame period is completed.
In the embodiment, the imaging method has the functions of phased array scanning and full focusing scanning and imaging simultaneously, and according to the characteristics of phased array focusing imaging and full focusing imaging, the rapid time-sharing multiplexing is carried out on the ultrasonic excitation and receiving modules on the ultrasonic detection equipment, so that the effect of improving the imaging frame rate of the whole system is achieved.
Because the full matrix data is required to be acquired firstly and then focused imaging processing is carried out, the focusing operation of the full focusing imaging technology is complex, the focusing imaging is carried out point by point, the focusing imaging processing time each time is very long, the time is in direct proportion to the imaging resolution, the larger the resolution is, the larger the imaging pixels are, and the focusing imaging processing time is longer. The phased array focusing imaging time is overlapped with the data sampling time, the phased array focusing imaging time is used for acquiring data and immediately focusing to obtain A-scan data, and then the A-scan data are spliced into an image.
By adopting the method of the embodiment of the invention, the internal synchronization period of the full focusing consists of a sampling time period and an imaging processing time period. The minimum value of the sampling period is related to the detection range and the ultrasonic sound velocity, and if the detection range is L and the sound velocity is V, the minimum value of the imaging processing period is 2*L/V. The minimum value of the imaging processing time period is related to the full-focus imaging resolution, the imaging resolution is set as c rows and v columns, the total pixel point is c x v, the time of the system focusing processing each pixel is set as b, and the minimum value of the imaging processing time period is c x v x b. In order to ensure that the phased array imaging technology can at least complete phased array focusing processing of a piece of data (i.e. m=1) in the imaging time period, and the phased array focusing processing time of a piece of data, i.e. the a-scan period, is equal to the sampling time period, therefore, the minimum value of the imaging time period must be greater than or equal to the minimum value of the sampling time period, in order to enable the ultrasonic system to reach the maximum frame rate when performing double-scan imaging, in practical application, the imaging processing time period is set to c×v×b, and the sampling time period is set to 2*L/V.
By adopting the method, the maximum m value of the processed A-scan data in the imaging time period of each internal synchronization period can be adaptively adjusted according to the phased array A-scan period. When the maximum number m of the A-scan data which can be processed in the imaging processing time period of one internal synchronization period is calculated, setting the imaging time period as tp and the sampling time period as tc, and setting m approximately equal to tp/tc;
m is a positive integer, and m is required to be ensured to be larger than or equal to tp. And then, according to the m value, the imaging processing time period is subdivided into m A-scanning periods, so that the frame period of the phased array is as small as possible, and the imaging frame rate of the whole system is improved.
When the method is adopted for full-focus imaging, the ultrasonic transmitting and receiving module on the ultrasonic detection equipment only needs to work according to the full-focus array element control mode in the sampling time period, the acquired full-matrix data are stored, then full-focus imaging processing is carried out on the full-matrix data stored in the current internal synchronization period in the imaging processing time period, the full-matrix data stored in the current internal synchronization period are cleared after the processing is finished, the next internal synchronization period is waited for acquiring new full-matrix data, the new full-matrix data are stored in the storage unit, the storage space is reused, and the waste of the storage space is avoided. And in the imaging processing time period, phased array phase array element control is performed on the ultrasonic transmitting and receiving module at the same time, phased array data is generated, and phased array focusing processing is immediately performed on the phased array data to obtain phased array A-scan data without storage. Because the ultrasonic transmitting and receiving module respectively generates full matrix data and phased array data in different time periods, the two groups of data are not mutually influenced, and the normal focusing imaging of the two imaging modes is ensured.
As shown in fig. 6, when the full-focus and phased array double-scan imaging method of the invention is used for phased array and full-focus double-scan imaging, the final imaging frame rate of the whole system is determined by the minimum frame rate between the frame rate of the full-focus imaging and the frame rate of the phased array imaging, and if the frame rate of the full-focus imaging is lower than the frame rate of the phased array imaging, the frame rate of the full-focus imaging is the frame rate of the system; if the frame rate of the full-focus imaging is higher than that of the phased array imaging, the frame rate of the phased array imaging is the frame rate of the system, so that the frame rate of the whole system is prevented from being greatly reduced when the traditional full-focus imaging and the phased array imaging perform double scanning, and the frame rate of the whole system is effectively improved.
The sampling time period in the internal synchronization period of the invention represents the duration of effective full matrix data required by the ultrasonic excitation and receiving module to acquire in the full-focus array element control mode, and the imaging processing time period represents the time period required by completing the full-focus operation on all pixel points of the full-focus image after the sampling time period is ended, as shown in fig. 4.
The effect of the present invention will be described by way of example, assuming that the detection range is within 150mm of the object surface, the ultrasonic sound velocity is 5900m/s (i.e., 0.0059 ms/ns), the full-focus imaging resolution is 400 rows and 400 columns, the full-focus operation processing time for each pixel point is 5ns, and the full-focus aperture N is 32; assume that the total number of phased array a scan data T is 512, and each a scan data has a sampling point L of 896.
As shown in fig. 3, according to the conventional dual scanning imaging method of full focus and phased array, a full focus frame period when scanning is performed by adopting the full focus imaging technology is calculated first, the sampling period is at least 150×2/0.0059= 50848ns, the imaging period is at least 5×400×400=800000 ns, so that the whole internal synchronization period is at least 50848+800000= 850848ns, and the whole full focus frame period is at least 850848 ×32= 27227136ns, which is about 27.2ms. Then, a phased array frame period when scanning is performed by a phased array imaging technology is calculated, the phased array imaging process is to perform focusing imaging processing while sampling, one data processing is acquired, the imaging period and the data sampling time are overlapped, so that each A scanning period is at least 150 x 2/0.0059=50848ns, and the phased array frame period formed by 512A scanning is 512 x 50848= 26034137ns and is about 26.0ms.
Therefore, the imaging frame period of the whole system is 27.2+26.0=53.2 ms, the frame rate is 1×1000/53.2×18.8hz, namely every 53.2ms, and the whole system can output one frame of full-focusing image and one frame of phased array image.
As shown in fig. 6, according to the full-focus and phased array dual-scan imaging method of the embodiment of the present invention, for the full-focus frame period, the sampling period is set to 50848ns, and the imaging period is set to 800000ns, so that each internal synchronization period is 850848ns, and the full-focus frame period is 850848x32= 27227136ns, which is about 27.2ms. The maximum amount of processed A-scan data in the imaging processing time period of the internal synchronization period is calculated to be m=800000/50848 approximately equal to 15, so that 15A-scan periods are set in the imaging processing time period of each internal synchronization period, 15 phased array A-scan data are processed, 512A-scan forming phased array frame periods need 512/15 approximately equal to 35 internal synchronization periods, the phased array frame periods are 35 x 850848= 29779680ns and are approximately 29.8ms, a full-focus image is obtained every 27.2ms, a phased array image is obtained every 29.8ms, and the overall frame period of the system is 29.8ms and is approximately 1 x 1000/29.8 approximately equal to 33.6hz because the phased array frame period is 29.8ms, namely, the phased array and full-focus double-scan imaging method can obtain 1 full-focus image and one-focus phased array image every 29.8 ms. Compared with the traditional double-scanning imaging method, the method can improve the frame rate by (33.6-18.8)/18.8 approximately 78.7 percent.
Therefore, the invention can effectively improve the frame rate of the whole system when phased array and full focusing double scanning imaging is carried out.
It should be noted that the key points of the embodiment of the present invention are as follows:
1. in an internal synchronization period of full focusing, the focusing imaging processing of the phased array imaging technology and the focusing processing of the full focusing imaging technology can be simultaneously carried out, so that the control of the two imaging modes on the transmitting and receiving modules is ensured not to interfere with each other, and the control of the respective transmitting and receiving modules can be rapidly completed in a round robin manner.
2. An internal synchronization period of full focusing is divided into a sampling time period and an imaging time period, full focusing imaging control of the transmitting and receiving module is firstly carried out in the sampling time, phased array imaging control of the transmitting and receiving module is carried out in the imaging processing time period, the sequence cannot be reversed, and otherwise, simultaneous imaging of two scanning imaging modes cannot be completed.
3. The imaging time period of each internal synchronization period can adaptively adjust and process the maximum m value of the A scanning data according to the A scanning period of the phased array, so that the frame period of the phased array is as small as possible, and the imaging frame rate of the whole system is improved.
4. The minimum value of the imaging time period of each internal synchronization period is larger than the sampling time period, so that phased array imaging can complete focusing processing of at least one piece of A-scan data in the imaging time period. (for a phased array, the time for which the phased array collects data is equal to the time for which the phased array processes to a-scan, the phased array processes to a-scan with the time for collection focused, and the time period for which the phased array collects data is as long as the sampling period for full focus). If the detection range is L and the sound velocity is V, the minimum value of the imaging processing time period is larger than 2*L/V.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (4)
1. The full-focusing and phased array double-scanning imaging method is characterized by comprising the following steps of:
s1, dividing imaging time into a plurality of full-focus frame periods according to a preset detection range, a preset full-focus imaging resolution and a preset imaging frame rate, and dividing each full-focus frame period into N internal synchronization periods, wherein each internal synchronization period comprises a sampling time period tc and an imaging processing time period tp; the imaging processing time period tp is greater than the sampling time period tc;
s2, generating a full-focus image G according to the preset full-focus imaging resolution 1 Simultaneously generating a phased array image P according to the preset quantity T of the A-scan data required by phased array imaging and the sampling point number r of each A-scan data, and fully focusing the image G 1 Initializing all pixel values in the phased array image P to 0, then calculating the maximum amount m=tp/tc of the A-scan data which can be processed in the imaging processing time period tp, dividing the imaging processing time period tp into m A-scan periods, and setting an identification number for each A-scan period in sequence; then executing the step S3 and the step S4 in parallel; wherein m is a positive integer, and m×tc is greater than or equal to tp;
s3, in a sampling time period of an ith internal synchronous period of a current full-focus imaging frame period, operating a full-focus array element control mode to perform ultrasonic excitation, and storing received echo signals; in the imaging processing time period of the ith internal synchronization period, performing full-focusing operation imaging processing on the echo signal to obtain a focusing image G after ultrasonic excitation of the first i array elements i The method comprises the steps of carrying out a first treatment on the surface of the Repeatedly executing the step S3 until i is equal to N, and executing the step S5;
s4, in an imaging processing time period of an ith internal synchronization period of a current full-focus imaging frame period, operating a phased array element control mode to perform ultrasonic excitation, performing array element ultrasonic excitation and ultrasonic signal reception according to phased array parameters corresponding to each A-scan period in the current imaging processing time period, performing phased array focusing processing on the received ultrasonic signals to obtain m pieces of A-scan data, storing the m pieces of A-scan data into a column corresponding to an A-scan period identification number in the phased array image P, and sequentially setting identification numbers for m A-scan periods of a next internal synchronization period based on the A-scan period identification number extending the last internal synchronization period; repeatedly executing the step S4 until the identification number of the current phased array A scanning period is equal to T, and executing the step S6;
s5, in the imaging processing time period of the N-th internal synchronization period of the current full-focus imaging frame period, full-focus operation is carried out on echo signals received after ultrasonic excitation is carried out on N array elements, so that a full-focus image G of the current frame is obtained N The method comprises the steps of carrying out a first treatment on the surface of the Returning to the execution step S3 to process the next full-focus imaging frame period until the last full-focus imaging frame period is completed;
s6, when the identification number of the phased array A scanning period is T, performing ultrasonic excitation and ultrasonic signal reception of array elements according to phased array parameters of the T-th phased array A scanning data in the current imaging processing time period, and performing phased array focusing processing to obtain the T-th A scanning data A T And scan data A T The T-th column stored in the phased array focusing diagram P is used for obtaining a phased array image P of the current frame, and then, identification numbers are set for m A-scanning periods of the next internal synchronization period in sequence; and returning to the execution step S4 to process the next phased array frame period until the process of the last phased array frame period is completed.
2. The dual focus and phased array scanning imaging method of claim 1, wherein the imaging processing period tp = c x v x b; wherein c is the number of rows of the preset full-focus imaging resolution, v is the number of columns of the preset full-focus imaging resolution, and b is the time for focusing each pixel by the system.
3. The dual focus and phased array scanning imaging method of claim 2, wherein the sampling period tc = 2*L/V; wherein L represents the preset detection range, and V represents the ultrasonic sound velocity.
4. The dual focus and phased array scanning imaging method as claimed in claim 1, wherein the full matrix data stored in the current inner synchronization period is cleared after the full focus imaging process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010562565.4A CN111812205B (en) | 2020-06-18 | 2020-06-18 | Full-focusing and phased array double-scanning imaging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010562565.4A CN111812205B (en) | 2020-06-18 | 2020-06-18 | Full-focusing and phased array double-scanning imaging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111812205A CN111812205A (en) | 2020-10-23 |
| CN111812205B true CN111812205B (en) | 2023-05-26 |
Family
ID=72845754
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010562565.4A Active CN111812205B (en) | 2020-06-18 | 2020-06-18 | Full-focusing and phased array double-scanning imaging method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111812205B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4543829A (en) * | 1983-01-21 | 1985-10-01 | Siemens Ag | Ultrasonic imaging system |
| FR2625562A1 (en) * | 1987-12-30 | 1989-07-07 | Labo Electronique Physique | ULTRASONIC ECHOGRAPH WITH IMPROVED CADENCE OF IMAGES |
| DE3926477A1 (en) * | 1989-08-10 | 1991-02-14 | Siemens Ag | METHOD FOR CONSTRUCTING A PARALLEL SCAN IMAGE WITH AN ULTRASONIC IMAGE DEVICE |
| DE102012025535A1 (en) * | 2012-12-14 | 2014-06-18 | Europipe Gmbh | Method for imaging ultrasonic testing of e.g. steel pipe, involves summing values in time-resolved amplitude information of ultrasonic signals, and classifying information before transmission and subsequent processing procedure |
| CN103913513A (en) * | 2014-03-26 | 2014-07-09 | 深圳大学 | Phased array overall situation focusing system and focusing method thereof |
| CN106596736A (en) * | 2016-12-14 | 2017-04-26 | 天津大学 | Real-time ultrasonic phased array total focusing imaging method |
| CN106651740A (en) * | 2016-11-29 | 2017-05-10 | 中国科学院声学研究所 | FPGA-based ultrasonic total data focusing quick imaging method and system |
| CN110927254A (en) * | 2019-12-11 | 2020-03-27 | 广州多浦乐电子科技股份有限公司 | High frame rate ultrasonic full-focusing imaging system realized based on FPGA |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10309934B2 (en) * | 2017-03-29 | 2019-06-04 | Olympus Scientific Solutions Americas Inc | Method and system of deducing sound velocity using time-of-flight of surface wave |
-
2020
- 2020-06-18 CN CN202010562565.4A patent/CN111812205B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4543829A (en) * | 1983-01-21 | 1985-10-01 | Siemens Ag | Ultrasonic imaging system |
| FR2625562A1 (en) * | 1987-12-30 | 1989-07-07 | Labo Electronique Physique | ULTRASONIC ECHOGRAPH WITH IMPROVED CADENCE OF IMAGES |
| DE3926477A1 (en) * | 1989-08-10 | 1991-02-14 | Siemens Ag | METHOD FOR CONSTRUCTING A PARALLEL SCAN IMAGE WITH AN ULTRASONIC IMAGE DEVICE |
| DE102012025535A1 (en) * | 2012-12-14 | 2014-06-18 | Europipe Gmbh | Method for imaging ultrasonic testing of e.g. steel pipe, involves summing values in time-resolved amplitude information of ultrasonic signals, and classifying information before transmission and subsequent processing procedure |
| CN103913513A (en) * | 2014-03-26 | 2014-07-09 | 深圳大学 | Phased array overall situation focusing system and focusing method thereof |
| CN106651740A (en) * | 2016-11-29 | 2017-05-10 | 中国科学院声学研究所 | FPGA-based ultrasonic total data focusing quick imaging method and system |
| CN106596736A (en) * | 2016-12-14 | 2017-04-26 | 天津大学 | Real-time ultrasonic phased array total focusing imaging method |
| CN110927254A (en) * | 2019-12-11 | 2020-03-27 | 广州多浦乐电子科技股份有限公司 | High frame rate ultrasonic full-focusing imaging system realized based on FPGA |
Non-Patent Citations (6)
| Title |
|---|
| A multi-FPGA architecture-based real-time TFM ultrasound imaging;Mickael Njiki等;《J Real-Time Image Proc》;20160127;第1-17页 * |
| A multi-FPGA implementation of real-time reconstruction using Total Focusing Method;Mickael Njiki等;《Proceedings of the 2013 IEEE International Conference on Cyber Technology in Automation, Control and Intelligent Systems》;20131231;第468-473页 * |
| On the Use of Advanced Focusing Techniques for Enhanced PA UT Inspection Capability;Daniel Richard等;《12th ECNDT》;20181231;第1-8页 * |
| 基于整体聚焦算法（TFM）的超声探测技术;马锐等;《舰船电子工程》;20160229;第36卷(第2期);第122-125页 * |
| 新一代超声相控阵双全法成像检测;李衍;《无损探伤》;20181031;第42卷(第5期);第1-7，18页 * |
| 超声相控阵全聚焦法成像检测;李衍;《无损检测》;20170531;第39卷(第5期);第57-64页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111812205A (en) | 2020-10-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7454973B2 (en) | Ultrasonic inspection method and ultrasonic inspection equipment | |
| CN110927254B (en) | High frame rate ultrasonic full-focusing imaging system realized based on FPGA | |
| CN103033816B (en) | Synthetic aperture focused ultrasonic imaging implementation method based on arc scanning transition | |
| Bulavinov et al. | Sampling phased array a new technique for signal processing and ultrasonic imaging | |
| EP2538846B1 (en) | Ultrasonic imaging apparatus and method of controlling delay | |
| US8584526B2 (en) | Ultrasonic flaw detection method and ultrasonic flaw detection equipment | |
| EP3581961A1 (en) | Method and apparatus for ultrasound imaging with improved beamforming | |
| CN103765240B (en) | Enhanced ultrasound image formation using qualified regions of overlapping transmit beams | |
| US6638220B2 (en) | Ultrasonic imaging method and ultrasonic imaging apparatus | |
| CN1296723C (en) | Method and apparatus for processing wave signals representative of a bulk structure to detect and analyze the structure | |
| US5042305A (en) | Ultrasonic flaw detecting system | |
| CN113109443A (en) | Focusing acoustic array imaging method and system | |
| US7331234B2 (en) | Ultrasonic imaging method and ultrasonic imaging apparatus | |
| CN102697524A (en) | Full-focus ultrasonic imaging method and application of method in blood flow imaging | |
| US9759690B2 (en) | Method and system for nondestructive ultrasound testing | |
| CN116754657A (en) | A fast algorithm for improving time-domain synthetic aperture imaging of reinforced concrete structures | |
| CN111812205B (en) | Full-focusing and phased array double-scanning imaging method | |
| JP2013215384A (en) | Ultrasonic diagnostic apparatus and ultrasonic image generation method | |
| Sutcliffe et al. | Virtual source aperture image processing methods for non-destructive testing | |
| CN118330037A (en) | Imaging algorithm of blind area defects in lead sealing based on ultrasonic phased array | |
| US12332218B2 (en) | Method for detecting discontinuities and system for implementing said method | |
| JP6047041B2 (en) | Ultrasonic diagnostic apparatus, signal processing method and program for ultrasonic diagnostic apparatus | |
| JPWO2019030815A1 (en) | Ultrasonic inspection method and ultrasonic inspection apparatus | |
| RU2395802C1 (en) | Method of ultrasound control over butt-welded seams | |
| CN105548363A (en) | Multi-route identification based ultrasonic detection imaging method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |