CN104820023B - The ultrasonic phased array detection means of the convertible array format of low-power consumption - Google Patents

Abstract

The invention provides an ultrasonic phased array detection device with low power consumption and real-time changeable array pattern. The whole system includes: FPGA control module, square MEMS ultrasonic sensor array, PCI bus, signal processing module, array form and frequency selection module. The FPGA module includes a pulse control unit and a beam control unit, and the square MEMS ultrasonic sensor array is composed of many MEMS ultrasonic sensors, which are square phased arrays with equal numbers of horizontal rows and vertical rows and constant spacing. At the same time, the array is arranged by a row The transmitting array and the row receiving array are arranged crosswise, each transmitting array element has an independent pulse excitation channel, and each receiving array element has an independent echo receiving channel; the signal processing module consists of amplifying units equal to the number of receiving array elements and The filter unit is composed; the array form and the frequency selection module are composed of button arrays, which can respectively represent several different array styles and different ultrasonic frequencies to adapt to different detection situations, thus simplifying the hardware structure of the array and being more suitable for application in various Different special environment robots perform various detections.

Description

Ultrasonic Phased Array Detection Device in Transformable Array Form with Low Power Consumption

technical field

The invention relates to the technical field of ultrasonic phased array detection and identification, in particular to a low-power ultrasonic phased array whose array form and ultrasonic frequency can be changed through real-time selection, which can conveniently change the array pattern and ultrasonic frequency, and can be applied to According to different working environments, different array forms of ultrasonic detection devices carried on robots for special environments are selected.

Background technique

As a kind of non-destructive testing, ultrasonic testing occupies an increasingly important position in the testing field. It is not only used in the military field, aerospace field, and medical field, but is now more and more applied to industrial flaw detection, special environment detection, and gesture detection. identification etc. As the industrial environment becomes more and more complex, the requirements for the precision, accuracy and resolution of ultrasonic phased arrays are also getting higher and higher. However, different types of phased arrays have their own advantages in terms of precision, accuracy and resolution. , to adapt to different situations.

Traditional phased arrays generally include square arrays, circular arrays, rice-shaped arrays, linear arrays, triangular arrays, quincunx arrays, etc., each of which has its own disadvantages and advantages, and is suitable for different scenarios. Generally, they can only be applied to several fixed occasions. If they are used in other occasions, there will be great defects. Therefore, different arrays may be needed for detection in different occasions, which makes it very inconvenient to use and greatly increases the hardware. cost. At the same time, most of the transmitting and receiving arrays at the present stage use analog ultrasonic circulators, which require complex signal processing circuits, which will increase the power consumption of the entire system while increasing the hardware cost. Therefore, it has become a problem faced by the existing ultrasonic phased arrays to combine different commonly used array forms on the minimum hardware for detection of variable arrays with low power consumption.

Contents of the invention

The object of the present invention is to provide a low power consumption ultrasonic detection device that can select an array form in real time.

The purpose of the present invention is achieved like this: by using the same number of transmitting arrays composed of analog sensors and receiving arrays composed of digital sensors to be arranged at equal intervals to form an ultrasonic detection phased array on an integrated circuit board, one row of transmitting Array elements A row of receiving array elements are arranged staggered with each other and the spacing between each array element is equal, and the number of rows composed of transmitting and receiving array elements is equal. Each transmitting array element has an independent pulse trigger channel, and each receiving array element has an independent echo signal processing channel. Each receiving element in the array is connected to a filter module in the signal processing module, which saves the amplification and A/D conversion circuit to simplify the processing circuit of the received echo signal, and the processed signal is directly sent to the FPGA in the The wave velocity control unit performs subsequent processing. At the same time, select different array styles and ultrasonic frequencies through the button array. After the pulse control unit of the FPGA detects the input signal, it will generate the pulse of the required frequency according to the programmed program to trigger the corresponding array element to combine the required array style. At the same time Ultrasonic waves of the desired frequency are generated.

The button array used in the present invention can be integrated with the FPGA on a circuit board to reduce the size, and the whole column of sensors can be connected with the FPGA through the bus, so that the button array can be easily extended to a farther distance.

By selecting the key array, not only can different frequencies be selected, but also the transmitting array and the receiving array can be selected as different or the same array forms according to actual detection needs.

As can be seen from the above technical solutions, since the present invention adopts the digital MEMS sensor to receive the whole column, the signal processing circuit is simplified, the processing time and hardware cost are greatly saved, and the power consumption is reduced. Different array styles can be selected on the basis of hardware, which greatly facilitates the selection of arrays and reduces the cost of use.

Description of drawings

The above and other aspects and advantages of the invention will become more readily apparent by describing in more detail exemplary embodiments of the invention with reference to the accompanying drawings, in which:

Fig. 1 is a schematic diagram of a phased array arrangement structure of the present invention;

Figure 2 is a system schematic diagram of the detection device.

detailed description

Hereinafter, the invention will now be described more fully with reference to the accompanying drawings, in which various embodiments are shown. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

The present invention will be specifically described and illustrated below in conjunction with the accompanying drawings, and the parameters used in the embodiments do not constitute limitations to the present invention.

The present invention designs an 8×8 square ultrasonic array composed of 64 MEMS sensors, as shown in Figure 1. This array is arranged crosswise by a row of transmitting arrays and a row of receiving arrays. Black solid ones represent transmitting array elements, and hollow ones represent The receiving array elements are welded on the integrated circuit board, so the transmitting array and the receiving array are both 8×4 square arrays.

Combining with Figure 2, each transmitting array element is directly connected to a port of the FPGA through a programmable amplifier and a filter unit, and each receiving array element is first connected to a filter unit of the signal processing module and then connected to the FPGA. After receiving the echo signal, each receiving array element does not need to perform amplification and A/D conversion, but directly filters the signal, and the processed signal is directly sent to the pulse control unit of FPGA for processing to display the detection result, so that both The signal processing time is saved, and the signal processing circuit becomes simpler and the hardware cost is reduced. Each button of the 4×4 button array is connected to a port of the FPGA, so that each button represents a different input signal. When the pulse control unit of the FPGA collects the input signals of different buttons, it can generate a synchronous frequency trigger pulse and output it to the ports of different control array elements to connect to the corresponding The amplifier drives the correspondingly connected array elements to generate ultrasonic waves of corresponding frequencies, thus forming the required array pattern and ultrasonic frequency, so that the same hardware structure can change many kinds of array patterns and ultrasonic frequencies, which greatly simplifies the hardware structure. Through the delay processing of the FPGA program, the ultrasonic waves generated by the corresponding array elements can be deflected to achieve phase control, so as to perform ultrasonic scanning detection. Finally, the scanning detection result can be sent to a display screen or a PC for display through the bus.

The present invention has been introduced in detail above. The present invention has small volume, simple structure, low cost, and low power consumption. It can combine the most array patterns with the least amount of hardware, and is especially suitable for detection of different environmental conditions.

The above descriptions are only examples of the present invention, and are not intended to limit the present invention. Various suitable modifications and variations are possible in the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (4)

1. A kind of 1. ultrasonic phased array detection means of the convertible array format of low-power consumption, it is characterised in that：Described device includes MEMS ultrasonic sensings phased array, array format and ultrasonic frequency selecting module, signal processing module, FPGA control modules；Institute State array format and ultrasonic frequency selecting module is used to select array format and it is expected ultrasonic frequency, and signal is transmitted to FPGA；MEMS sonacs composition N × N phased array forms square, circular, rice font or line for triggering corresponding array element The corresponding array pattern of type；

   The square array for forming N × N by several MEMS sonacs includes what is be made up of analog MEMS sonac The receiving array of emission array and the formed objects being made up of digital MEMS sonacs, a discharge therein penetrate the row of array element one The spacing received between the interlaced arrangement of array element and each array element is equal, launches equal with the row that reception array element each forms；

   Each transmitting array element has independent pulse-triggered passage, and the method that detection means is combined using push-button array and FPGA is entered The selection of a variety of array formats of row and ultrasonic frequency.
2. 2. the ultrasonic phased array detection means of the convertible array format of low-power consumption as claimed in claim 1, it is characterised in that Receiving array is by digital ultrasound sensor group into each receive connects signal processing module respectively behind array element.
3. 3. the ultrasonic phased array detection means of the convertible array format of low-power consumption as claimed in claim 1, it is characterised in that The FPGA control modules include pulse control unit and Beamsteering Unit.
4. 4. the ultrasonic phased array detection means of the convertible array format of low-power consumption as claimed in claim 2, it is characterised in that The signal processing module is made up of the amplifying unit and filter unit equal with receiving array element quantity；Array format and frequency choosing Module is selected to be made up of push-button array.