CN108007947A - A kind of curved x-ray imaging device and method - Google Patents

Abstract

The application discloses a curved surface X-ray imaging device and method. The X-ray emitter performs transillumination on the object; the X-ray beam penetrating the transilluminated object causes the photodiode array inside the curved surface X-ray imaging board to generate currents of different sizes; The current element collects the photocurrent of each array unit and converts it into a digital signal through the A/D conversion unit. The central processing unit collects the digital signal and transmits it through the communication unit. The image produced on the radiography plate is a projection image. By using a curved imaging plate and placing the X-ray transillumination source at the center of curvature, the transillumination in each direction can be vertical transillumination, minimizing image distortion. The use of curved imaging plate realizes the transillumination in each direction is vertical transillumination, minimizes image distortion and improves the quality of X-ray imaging.

Description

A curved surface X-ray imaging device and method

technical field

The present application relates to the technical field of electric equipment detection, and in particular to a curved surface X-ray imaging device and method.

Background technique

X-ray non-destructive testing is one of the five conventional non-destructive testing methods. It is mainly used for ray inspection of industrial equipment and has a very wide range of applications in industry. It is used for both metal inspection and non-metal inspection. The defects that may occur inside the metal, such as pores, pinholes, inclusions, porosity, cracks, segregation, incomplete penetration and insufficient fusion, etc., can be inspected by ray. The applied industries include special equipment, aerospace, ships, weapons, complete sets of hydraulic equipment, bridge steel structures, and the electric power industry. The application of X-ray non-destructive testing in the power industry is generally applied to the fault detection of power equipment, for example, through X-ray non-destructive testing of insulators, suspension clamps, strain clamps and other components.

Existing X-ray nondestructive testing equipment includes an X-ray transmitter and a plane detection board. During use, firstly, place the component to be tested on the plane detection board, and secondly, start the X-ray transmitter by adjusting the switch, and the X-ray transmitter emits X-rays to the component to be tested and the plane detection board, inside the plane detection board The control circuit converts the optical signal into an electrical signal and transmits it to the host computer.

The digital imaging plates of the current X-ray non-destructive testing equipment all use flat plates. During transillumination, only one direction is vertical transillumination, that is, only one aspect is vertical projection, there is no image distortion, and the quality of imaging depends entirely on amorphous The DQE of the electron-hole pair generated by the solar layer depends on the charge capability generated by the amorphous film. Since there is no visible light generation and no scattering, the spatial resolution depends on the size of the thin film crystal matrix per unit area. The larger the matrix, the individual thin film transistors The larger the number, the higher the spatial resolution. However, at present, it is difficult to achieve the effect of improving the spatial resolution by simply increasing the number of thin film transistors in the matrix.

Contents of the invention

The present application provides a curved surface X-ray imaging device and method to solve the problem of low image quality and no image distortion of the measured object in the X-ray detection process in the prior art.

In a first aspect, the present application provides a curved surface X-ray imaging device, which includes:

X-ray imaging boards, image acquisition components and data processing components;

The image acquisition element and the data processing element are arranged inside the X-ray imaging board, and the X-ray imaging board is a curved surface;

The image acquisition element is used to convert X-rays into electrical signals;

The data processing element is electrically connected to the image acquisition element, and is used to control the digitization of X-rays and the output of digitized images;

The image acquisition element includes a photodiode array, and each of the photodiode arrays includes a photodiode and a corresponding storage capacitor, the photodiode is electrically connected to the storage capacitor, and the photodiode The stage tube captures the reflected light and generates a diode current to form a digital image of the object.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the X-ray imaging board further has a communication element for transmitting digitized X-rays, and the communication element is also electrically connected to the data processing element Connection for controlling data transmission of digitized X-rays.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the image acquisition element is opaque to predetermined light and shadow.

With reference to the first aspect, in a third possible implementation manner of the first aspect, the photodiode is provided with a scintillator layer on one side of the image acquisition element, and the scintillator layer is used to convert the X-ray image converted into a visible light image; the photodiode is provided with a collection current element on the other side of the image collection element, and the collection current element is used to collect the photoelectric flux of each array unit.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the photodiode is an amorphous silicon photodiode.

In the second aspect, the present application also provides a curved surface X-ray imaging method, the method comprising:

Obtain the center of curvature of the X-ray imaging plate, and place the transillumination source near the center of curvature;

receiving an X-ray signal, and converting the X-ray signal into an X-ray analog signal;

converting the X-ray analog signal into an X-ray digital signal, amplifying the X-ray digital signal, and outputting an X-ray digital signal equalization value;

The equalized value of the X-ray digital signal is transmitted to a data processing element for data processing to generate an object detection image.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the method further includes: transmitting the object detection image to a host computer through a communication unit.

With reference to the second aspect, in a first possible implementation manner of the third aspect, receiving the X-ray signal and converting the X-ray signal into an X-ray analog signal includes:

receiving the X-ray signal, generating a current corresponding to the X-ray signal, collecting the current corresponding to the X-ray signal, and transmitting it to an analog-to-digital conversion unit to generate an X-ray analog signal.

The present application provides a curved surface X-ray imaging device and method. The X-ray emitter performs transillumination on the object; the X-ray beam penetrating the transilluminated object causes the photodiode array inside the curved surface X-ray imaging plate to generate currents of different sizes; The current collection element collects the photocurrent of each array unit and converts it into a digital signal through the A/D conversion unit. The central processing unit collects the digital signal and transmits it through the communication unit. The image produced on the x-ray imaging plate is a projection image. Therefore, if a flat imaging plate is used, only one direction is vertical transillumination, and the other directions are oblique transillumination, which will cause image distortion. If a curved imaging plate is used and the X-ray transillumination source is placed at the center of curvature, the transillumination in each direction can be vertical transillumination, minimizing image distortion. The curved imaging plate is used to realize that the transillumination in each direction is vertical transillumination, which minimizes image distortion and improves the quality of X-ray imaging.

Description of drawings

In order to illustrate the technical solution of the present application more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, on the premise of not paying creative labor, Additional drawings can also be derived from these drawings.

Fig. 1 is a schematic diagram of a curved surface X-ray imaging device provided by the present application;

FIG. 2 is a schematic structural diagram of a curved surface X-ray imaging device provided by the present application;

FIG. 3 is a schematic diagram of the internal structure of a curved surface X-ray imaging device provided by the present application;

FIG. 4 is a schematic diagram of a usage scenario of a curved surface X-ray imaging device provided by the present application;

Fig. 5 is a flow chart of a curved surface X-ray imaging method provided by the present application;

Fig. 6 is a flow chart of a curved surface X-ray imaging method according to a preferred embodiment;

Fig. 7 is a flow chart of a curved surface X-ray imaging method according to a preferred embodiment;

Fig. 8 is the circuit diagram of photodiode and signal amplifying circuit provided by the present application;

Fig. 9 is a circuit diagram of the data processing element provided by the present application;

FIG. 10 is a circuit diagram of the communication unit provided by the present application.

Illustration: including: 1. X-ray imaging plate, 2. Photodiode array, 3. Image acquisition element, 4. Data processing element, 5. Scintillation layer, 6. Photodiode, 7. Acquisition current element, 8. Input Output port, 9. External connection interface, 10. A/D conversion unit, 11. Signal amplification unit, 12. Data processing element, 13. Central processing unit, 14. Memory, 15. Communication unit, 16. X-ray emitter , 17. Transillumination objects.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The main purpose of the present invention is to provide a curved surface X-ray imaging device and imaging method, so that the projected X-rays are projected vertically on the X-ray imaging plate 1 in each direction, which minimizes the image of the measured object. out of shape. X-ray imaging board 1, the shape of the imaging board is a curved surface, the internal structure includes a photodiode array 2 and a photocurrent collection current element 7 located at the rear, an A/D conversion unit 10 connected to the collection current element 7 and a data processing element 4; The communication unit 15 is connected with the central processing unit and the power supply; the surface of the imaging plate is provided with a power indicator and a communication indicator light.

Imaging method, characterized in that it comprises the steps of:

(1) By arbitrarily drawing two lines perpendicular to the surface on the X-ray imaging plate 1 , the intersection of the two lines is the center of curvature of the curved X-ray imaging plate 1 .

(2) The X-ray emitter 16 is placed on the center of curvature of the curved surface X-ray imaging plate 1, the transilluminated object 17 is placed between the X-ray emitter 16 and the X-ray imaging plate 1, and the X-ray machine focus is measured to the X-ray imaging Board 1 distance.

(3) Open the power switch of X-ray imaging board 1, after treating that curved surface imaging board power supply and communication indicator light are lighted, open X-ray emitter 16 and carry out transillumination to object; The internal photodiode array 2 of the curved surface X-ray imaging board 1 produces currents of different sizes; the current collection element 7 collects the photocurrent of each array unit, and converts it into a digital signal through the A/D conversion unit 10, and the central processing unit converts the digital signal into a digital signal. After the signal is collected, it is transmitted through the communication unit 15 .

Please refer to Fig. 4, X-ray emitter 16 carries out transillumination to object; The X-ray beam 12 that penetrates transillumination object 17 makes the internal photodiode array 2 of curved surface X-ray imaging board 1 produce the electric current of different sizes; Acquisition current element 7 The photocurrent of each array unit is collected, and converted into a digital signal by the A/D conversion unit 10. The central processing unit collects the digital signal and transmits it through the communication unit 15. When the X-ray beam 12 transmits the object to be detected, the The images generated on the X-ray imaging plate 1 are projection images. Therefore, if a flat imaging plate is used, only one direction is vertical transillumination, and the other directions are oblique transillumination, which will cause image distortion. If a curved imaging plate is used and the X-ray transillumination source is placed at the center of curvature, the transillumination in each direction can be vertical transillumination, minimizing image distortion. The curved imaging plate is used to realize that the transillumination in each direction is vertical transillumination, which minimizes image distortion and improves the quality of X-ray imaging.

Therefore, the beneficial result of the present invention is: adopting the curved imaging plate realizes that the transillumination in each direction is vertical transillumination, minimizes image distortion, and improves X-ray imaging quality.

Please refer to Fig. 1 and Fig. 2, the present application provides a curved surface X-ray imaging device, including: X-ray imaging board 1, image acquisition element 3 and data processing element 4;

The image acquisition element 3 and the data processing element 4 are arranged inside the X-ray imaging board 1, and the X-ray imaging board 1 is a curved surface;

The image acquisition element 3 is used to convert X-rays into electrical signals;

The data processing element 4 is electrically connected to the image acquisition element 3, and is used to control the digitization of X-rays and the output of digitized images;

The image acquisition element 3 includes a photodiode array 2, each of the photodiode arrays 2 includes a photodiode 6 and a corresponding storage capacitor, and the photodiode 6 is electrically connected to the storage capacitor , the photodiode 6 captures reflected light and generates a diode current, thereby forming a digital image of the object. The photodiode 6 generally consists of 512 or 1024 diodes arranged linearly or in multiple groups on the crystalline silicon, responsible for receiving the optical signal after being split by the grating, and temporarily storing the optical signal, reaching the preset value of power storage, and finally converting it into electrical energy through the transmission system. Signal output, the light intensity signal received by photodiode 6 is conducted by measuring the amount of charge on storage capacitors connected to the common output line by solid-state line switches controlled by a register, and before the light signal is received by the diodes, the capacitor is When the power is fully loaded, at the beginning of each measurement cycle, due to the light irradiating the diode, an incident photodiode current is generated, causing the capacitor to release a certain amount of power quantitatively, and then the current to recharge the capacitor is proportional to the light intensity required for amplification. Realize photoelectric conversion.

As shown in Figure 1, the acquisition circuit element 7 collects the current generated by the photodiode 6, and then through the A/D conversion unit, it is converted into an electrical signal and transmitted to the signal amplifying unit 11, and the signal amplifying unit 11 amplifies the electrical signal and transmits it to , the central processing unit 13, the central processing unit 13 converts the electrical signal into an image and transmits it to the memory 14 for storage, and then transmits it to the computer through the communication unit 15. The curved X-ray imaging board may include an external connection interface 9 via an input and output port 8, so that the X-ray imaging board 1 can transmit data to a computer through a data cable.

An embodiment of the image acquisition element 3 as shown in Figure 1, the image acquisition element 3 may include, for example, an acquisition array composed of organic photodiodes, and the array of photodiodes may be an aggregation array including thousands of photodiodes, so that each The photosensitive diode generates electric power according to the light reflected by the measured object and absorbed by the photosensitive diode, and the electric power generated by the photosensitive diode can be stored in the memory 14 as a digital image of the measured object.

The X-ray imaging panel 1 also has a communication element for transmitting digitized X-rays, and the communication element is also electrically connected to the data processing element 4 for controlling data transmission of digitized X-rays.

The image acquisition element 3 is non-transparent to the predetermined light and shadow, and the image acquisition element 3 is opaque to the light from some predetermined light sources. The process of X-ray irradiation and imaging does not need to be directly observed by human vision, and the image is obtained through As shown by the computer, the image acquisition element 3 also plays a role in blocking X-rays. As shown in FIG. 4, the image acquisition element 3 includes a photodiode array 2, and each photodiode array 2 includes a photodiode 6 and a corresponding storage capacitor. Therefore, the photodiode 6 receives X-rays that pass through the measured object, And the current generated by the photodiode 6 is collected by the current collection element 7 , therefore, in this embodiment, the image collection element 3 does not have to be transparent.

Please refer to FIG. 3, the photodiode 6 is provided with a scintillator layer 5 on one side of the image acquisition element 3, and the scintillator layer 5 is used to convert an X-ray image into a visible light image; the photodiode 6 On the other side of the image collection element 3, a current collection element 7 is arranged, and the current collection element 7 is used to collect the photoelectric flux of each array unit. The incident X-ray image is converted into a visible light image by the scintillation crystal, and the visible light image is converted into a charge image by the amorphous silicon photodiode on the next layer. The absolute charge signal is taken out line by line, converted into a digital signal, and then transmitted to the computer through the communication unit. In order to form an X-ray digital image, the photodiode 6 is an amorphous silicon photodiode.

Please refer to Fig. 5, the present application also provides a curved surface X-ray imaging method,

Obtain the center of curvature of the X-ray imaging plate, and place the transillumination source near the center of curvature;

receiving an X-ray signal, and converting the X-ray signal into an X-ray analog signal;

converting the X-ray analog signal into an X-ray digital signal, amplifying the X-ray digital signal, and outputting an X-ray digital signal equalization value;

The equalized value of the X-ray digital signal is transmitted to a data processing element for data processing to generate an object detection image.

Please refer to FIG. 6 , the method further includes: transmitting the object detection image to a host computer through a communication unit. Host computer, including computer, notebook and other data processing equipment.

Please refer to Fig. 7, the X-ray signal is received, and the X-ray signal is converted into an X-ray analog signal, including:

receiving the X-ray signal, generating a current corresponding to the X-ray signal, collecting the current corresponding to the X-ray signal, and transmitting it to an analog-to-digital conversion unit to generate an X-ray analog signal.

It can be seen from the above technical solutions that in the curved surface X-ray imaging device and method provided by the present invention, the X-ray emitter 16 performs transillumination on the object; The photodiode array 2 generates currents of different sizes; the current collection element 7 collects the photocurrent of each array unit, and converts it into a digital signal through the A/D conversion unit 10, and the central processing unit collects the digital signal through the communication unit 15 After transmission, when the X-ray beam 12 penetrates the detected object, the image generated on the X-ray imaging plate 1 is projection imaging. Therefore, if a flat imaging plate is used, only one direction is vertical transillumination, and the other directions are oblique transillumination, which will cause image distortion. If a curved imaging plate is used and the X-ray transillumination source is placed at the center of curvature, the transillumination in each direction can be vertical transillumination, minimizing image distortion. The curved imaging plate is used to realize that the transillumination in each direction is vertical transillumination, which minimizes image distortion and improves the quality of X-ray imaging.

In a specific implementation, the present invention also provides a computer storage medium, wherein the computer storage medium may store a program, and the program may include some or all of the steps in each embodiment of the calling method provided by the present invention when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (English: read-only memory, ROM for short), or a random access memory (English: random access memory, RAM for short), and the like.

Those skilled in the art can clearly understand that the technologies in the embodiments of the present invention can be implemented by means of software plus a necessary general-purpose hardware platform. Based on this understanding, the essence of the technical solutions in the embodiments of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM , magnetic disk, optical disk, etc., including several instructions to enable a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of the present invention.

For the same and similar parts among the various embodiments in this specification, refer to each other. In particular, as for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for relevant parts, refer to the description in the method embodiment.

The embodiments of the present invention described above are not intended to limit the protection scope of the present invention.

Claims (8)

1. A curved surface X-ray imaging device, comprising: an X-ray imaging board (1), an image acquisition element (3) and a data processing element (4); The image acquisition element (3) and the data processing element (4) are arranged inside the X-ray imaging board (1), and the X-ray imaging board (1) is a curved surface; The image acquisition element (3) is used to convert X-rays into electrical signals; The data processing element (4) is electrically connected to the image acquisition element (3), and is used to control the digitization of X-rays and the output of digitized images; The image acquisition element (3) includes a photodiode array (2), each of the photodiode arrays (2) includes a photodiode (6) and a corresponding storage capacitor, and the photodiode (6) Electrically connected with the storage capacitor, the photodiode (6) captures reflected light and generates a diode current, thereby forming a digital image of the object. 2. The curved surface X-ray imaging device according to claim 1, characterized in that, the X-ray imaging board (1) also has a communication element for transmitting digitized X-rays, and the communication element is also connected with the data A processing element (4) is electrically connected for controlling the data transmission of the digitized X-rays. 3. The curved surface X-ray imaging device according to claim 2, characterized in that, the image acquisition element (3) is non-transparent to the predetermined light and shadow. 4. The curved surface X-ray imaging device according to claim 1, characterized in that, the photodiode (6) is provided with a scintillator layer (5) on one side of the image acquisition element (3), and the scintillation tomography (5), for converting the X-ray image into a visible light image; The photodiode (6) is provided with a current collection element (7) on the other side of the image collection element (3), and the current collection element (7) is used to collect the photoelectric flux of each array unit. 5. The curved surface X-ray imaging device according to claim 1, characterized in that the photodiode (6) is an amorphous silicon photodiode. 6. A curved surface X-ray imaging method, comprising: Obtain the center of curvature of the X-ray imaging plate, and place the transillumination source near the center of curvature; receiving an X-ray signal, and converting the X-ray signal into an X-ray analog signal; converting the X-ray analog signal into an X-ray digital signal, amplifying the X-ray digital signal, and outputting an X-ray digital signal equalization value; The equalized value of the X-ray digital signal is transmitted to a data processing element for data processing to generate an object detection image. 7. The curved surface X-ray imaging method according to claim 6, further comprising: transmitting the object detection image to a host computer through a communication unit. 8. The curved surface X-ray imaging method according to claim 6, wherein the receiving the X-ray signal and converting the X-ray signal into an X-ray analog signal comprises: receiving the X-ray signal, generating a current corresponding to the X-ray signal, collecting the current corresponding to the X-ray signal, and transmitting it to an analog-to-digital conversion unit to generate an X-ray analog signal.