Electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging device and method

Abstract

The present application discloses an electromagnetic ultrasonic phased array high-energy excitation and full-domain high-speed focusing imaging device and method, which relates to the field of ultrasonic non-destructive testing technology. The device includes: a differential isolation high-voltage pulse transmitter, a first programmable switch, a second programmable switch, a third programmable switch, a fourth programmable switch, a multi-channel isolator, a phased array electromagnetic ultrasonic sensor, a plurality of preamplifiers and a data processing module; by controlling the programmable switch, positive pulses and negative pulses can be emitted, and then two high-voltage pulse excitation data sets with the same parameters but opposite amplitudes can be obtained. Adding the two data sets can offset the inherent noise in the excitation loop, thereby improving the signal-to-noise ratio and resolution of the signal. Compared with the traditional phased array that excites each probe one by one according to the delay rule, the present application only needs to excite twice, which is fast and improves work efficiency. At the same time, the amount of collected data is greatly reduced, which reduces the amount of subsequent calculations, improves detection efficiency and reduces hardware requirements.

Description

Technical Field

[0001] The present application relates to the technical field of ultrasonic nondestructive testing, and in particular to an electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging device and method. Background Art

[0002] Piezoelectric ultrasonic phased array technology has higher defect detection resolution than single-channel ultrasonic detectors and is a relatively mature technology. Many piezoelectric ultrasonic phased array detection technologies and instruments have appeared on the market. The instruments mainly include multi-channel delayed excitation modules, multi-channel high-voltage excitation modules, multi-channel acquisition modules and high-speed data processing modules, with fast detection speed and high detection accuracy.

[0003] Electromagnetic ultrasonic phased array detection has the advantages of non-contact and no need for grinding. Compared with piezoelectric ultrasound, it has a wider range of applications. Some researchers have invented related electromagnetic ultrasonic phased array technical solutions, and there are also multiple electromagnetic ultrasonic phased array technical invention solutions. At present, electromagnetic ultrasonic phased array technology mainly follows the piezoelectric phased array technical solution, including channel delay law setting and excitation receiving mode. However, due to the high transduction efficiency of the piezoelectric phased array transducer, the required excitation voltage is low, the signal echo amplifier gain is small, and the difficulty of realizing the piezoelectric ultrasonic phased array is low. Electromagnetic ultrasound uses coils to realize electric-magnetic-acoustic transduction, and the transduction efficiency is low. Its excitation requires a large voltage and a high-gain high-signal-to-noise ratio echo signal conditioning circuit. Electromagnetic ultrasonic signals often need to be averaged multiple times to obtain a good signal-to-noise ratio. Therefore, the electromagnetic ultrasonic phased array is more difficult than the piezoelectric ultrasonic phased array, and the electromagnetic ultrasonic phased array requires a larger volume and a larger amount of calculation. Summary of the invention

[0004] The purpose of this application is to provide an electromagnetic ultrasonic phased array high-energy excitation and full-field high-speed focusing imaging device and method, which can improve the electromagnetic ultrasonic excitation energy and reduce the imaging calculation amount, while reducing the hardware requirements, improving the instrument signal-to-noise ratio, imaging speed and imaging clarity.

[0005] To achieve the above objectives, this application provides the following solutions.

[0006] In the first aspect, the present application provides an electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging device, which includes: a differentially isolated high-voltage pulse transmitter, a first programmable switch, a second programmable switch, a third programmable switch, a fourth programmable switch, a multi-channel isolator, a phased array electromagnetic ultrasonic sensor, a plurality of preamplifiers and a data processing module.

[0007] The positive pole of the differential isolated high-voltage pulse transmitter is connected to the first programmable switch and the second programmable switch, and the negative pole of the differential isolated high-voltage pulse transmitter is connected to the third programmable switch and the fourth programmable switch; when the differential isolated high-voltage pulse transmitter transmits a pulse, if the fourth programmable switch and the second programmable switch are closed, the first programmable switch and the third programmable switch are disconnected, and a positive pulse is transmitted from the second programmable switch; if the fourth programmable switch and the second programmable switch are disconnected, the first programmable switch and the third programmable switch are closed, and a negative pulse is transmitted from the third programmable switch.

[0008] The second program-controlled switch and the third program-controlled switch are respectively connected to the multi-channel isolator.

[0009] The phased array electromagnetic ultrasonic sensor includes a plurality of array elements connected in parallel.

[0010] The multi-channel isolator includes a plurality of delay timers connected in parallel; each of the delay timers is connected to a corresponding array element, respectively, and is used to control the delay of each array element.

[0011] Based on the positive pulse and the negative pulse, each array element excites the first ultrasonic wave and the second ultrasonic wave according to a specified delay.

[0012] When the first ultrasonic wave and the second ultrasonic wave contact the measured area, a first ultrasonic echo and a second ultrasonic echo are generated, and the first ultrasonic echo and the second ultrasonic echo are received by each array element; for each array element, the received first ultrasonic echo corresponds to the emitted first ultrasonic wave, and the received second ultrasonic echo corresponds to the emitted second ultrasonic wave.

[0013] Each of the preamplifiers is connected to a corresponding array element, and is used to amplify, filter, and perform analog-to-digital conversion on the first ultrasonic echo and the second ultrasonic echo to obtain a first data set and a second data set.

[0014] The data processing module is connected to each of the preamplifiers, respectively, and is used to add the first data set and the second data set to obtain a total data set; determine the total superimposed echo amplitude at any position in the measured area according to the total data set and the detection coordinate system; obtain material defect information according to the total superimposed echo amplitude; the total data set includes the collected data of several array elements; the detection coordinate system is a coordinate system established with the center of the first array element.

[0015] In the second aspect, the present application provides an electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging method, which is applied to the electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging device described above, and the electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging method includes the following contents.

[0016] Based on the forward pulse, a first ultrasonic wave is obtained; the first ultrasonic wave is an ultrasonic wave excited by exciting a plurality of array elements of a phased array electromagnetic ultrasonic sensor according to a specified delay rule.

[0017] According to the first ultrasonic wave, a first ultrasonic echo is acquired; the first ultrasonic echo is an echo generated when the first ultrasonic wave contacts the measured area.

[0018] The first ultrasonic echo is amplified, filtered, and analog-to-digital converted to obtain a first data set.

[0019] Based on the reverse pulse, a second ultrasonic wave is obtained; the second ultrasonic wave is an ultrasonic wave excited by exciting a plurality of array elements of a phased array electromagnetic ultrasonic sensor according to a specified delay rule.

[0020] According to the second ultrasonic wave, a second ultrasonic echo is acquired; the second ultrasonic echo is an echo generated when the second ultrasonic wave contacts the measured area.

[0021] The second ultrasonic echo is amplified, filtered, and analog-to-digital converted to obtain a second data set.

[0022] The first data set and the second data set are added together to obtain a total data set; the total data set includes the collected data of a plurality of array elements.

[0023] The total superimposed echo amplitude at any position in the measured area is determined according to the total data set and the detection coordinate system; the detection coordinate system is a coordinate system established with the center of the first array element; and the material defect information is obtained according to the total superimposed echo amplitude.

[0024] According to the specific embodiments provided in this application, this application discloses the following technical effects.

[0025] The present application provides an electromagnetic ultrasonic phased array high-energy excitation and full-domain high-speed focusing imaging device and method, the electromagnetic ultrasonic phased array high-energy excitation and full-domain high-speed focusing imaging device includes: a differential isolation high-voltage pulse transmitter, a first programmable switch, a second programmable switch, a third programmable switch, a fourth programmable switch, a multi-channel isolator, a phased array electromagnetic ultrasonic sensor, a plurality of preamplifiers and a data processing module; by controlling the programmable switch, positive pulses and negative pulses can be emitted, and then two high-voltage pulse excitation data sets with the same parameters but opposite amplitudes can be obtained. Adding the two data sets can offset the inherent noise in the excitation circuit, and improve the signal-to-noise ratio and resolution. Compared with the traditional phased array that excites the probes one by one according to the delay rule, the present application only needs to excite twice, which is fast and improves work efficiency. At the same time, the amount of collected data is greatly reduced, which reduces the amount of subsequent calculations, improves detection efficiency and reduces hardware requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic structural diagram of an electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging device provided in one embodiment of the present application.

[0028] Figure 2 A schematic flow chart of an electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging method provided in one embodiment of the present application.

[0029] Figure 3 A schematic diagram of forward pulse excitation provided in one embodiment of the present application.

[0030] Figure 4 A schematic diagram of reverse pulse excitation provided in one embodiment of the present application.

[0031] Figure 5 A schematic diagram of a detection coordinate system provided in one embodiment of the present application.

[0032] Figure 6 A schematic diagram of a defective test block provided in one embodiment of the present application.

[0033] Figure 7 Schematic diagram of the detection results using the imaging method of the present application.

[0034] Figure 8 This is a schematic diagram of the detection results using a common phased array program algorithm. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] In an exemplary embodiment, Figure 1 As shown, an electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging device is provided, and the electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging device includes: a differential isolation high-voltage pulse transmitter, a first programmable switch S1, a second programmable switch S2, a third programmable switch S3, a fourth programmable switch S4, a multi-channel isolator, a phased array electromagnetic ultrasonic sensor, a plurality of preamplifiers and a data processing module.

[0038] The positive pole of the differential isolated high-voltage pulse transmitter is connected to the first programmable switch S1 and the second programmable switch S2, and the negative pole of the differential isolated high-voltage pulse transmitter is connected to the third programmable switch S3 and the fourth programmable switch S4; when the differential isolated high-voltage pulse transmitter transmits a pulse, if the fourth programmable switch S4 and the second programmable switch S2 are closed, the first programmable switch S1 and the third programmable switch S3 are disconnected, and the second programmable switch S2 transmits a positive pulse; if the fourth programmable switch S4 and the second programmable switch S2 are disconnected, the first programmable switch S1 and the third programmable switch S3 are closed, and the third programmable switch S3 transmits a negative pulse.

[0039] The second program-controlled switch S2 and the third program-controlled switch S3 are respectively connected to the multi-channel isolator.

[0040] The phased array electromagnetic ultrasonic sensor includes a plurality of array elements connected in parallel, each array element is an independent coil and can independently receive ultrasonic signals.

[0041] The multi-channel isolator includes a plurality of delay timers connected in parallel; each of the delay timers is connected to a corresponding array element, respectively, and is used to control the delay of each array element.

[0042] Based on the positive pulse and the negative pulse, each array element excites the first ultrasonic wave and the second ultrasonic wave according to a specified delay.

[0043] When the first ultrasonic wave and the second ultrasonic wave contact the measured area, a first ultrasonic echo and a second ultrasonic echo are generated, and the first ultrasonic echo and the second ultrasonic echo are received by each array element; for each array element, the received first ultrasonic echo corresponds to the emitted first ultrasonic wave, and the received second ultrasonic echo corresponds to the emitted second ultrasonic wave.

[0044] Each of the preamplifiers is connected to a corresponding array element, and is used to amplify, filter, and perform analog-to-digital conversion on the first ultrasonic echo and the second ultrasonic echo to obtain a first data set and a second data set.

[0045] The data processing module is connected to each of the preamplifiers, respectively, and is used to add the first data set and the second data set to obtain a total data set; determine the total superimposed echo amplitude at any position in the measured area according to the total data set and the detection coordinate system; obtain material defect information according to the total superimposed echo amplitude; the total data set includes the collected data of several array elements; the detection coordinate system is a coordinate system established with the center of the first array element.

[0046] As an optional embodiment, the electromagnetic ultrasonic phased array high-energy excitation and full-field high-speed focusing imaging device also includes: a main control module, which is respectively connected to the differential isolation high-voltage pulse transmitter and the data processing module, and is used to control the differential isolation high-voltage pulse transmitter to emit pulses, and is also used to adjust the parameters of the data processing module.

[0047] As an optional implementation, the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device further includes: a display module.

[0048] The main control module is connected to the display module, and is also used to display the tested area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude in a color map to obtain a final test result map.

[0049] Among them, the output end of the differential isolation high-voltage pulse transmitter is in differential isolation mode, that is, the positive and negative ends of the output end of the high-voltage pulse transmitter are not connected to the system ground.

[0050] The multi-channel isolator contains a delay timer. When the excitation trigger signal comes, each array element excites the corresponding array element of each phased array electromagnetic ultrasonic sensor to emit after its own delay, forming a high-energy ultrasonic wave directed in a specified direction, and isolating the array elements of each phased array electromagnetic ultrasonic sensor so that the received signals between the array elements can be independent of each other without crosstalk. It allows the high-voltage pulse (generally tens of volts to thousands of volts) emitted by the high-voltage pulse transmitter to pass through each array element of the phased array electromagnetic ultrasonic sensor to excite each array element of the phased array electromagnetic ultrasonic sensor to work. The weak ultrasonic signal received by each array element of the phased array electromagnetic ultrasonic sensor cannot pass through the multi-channel isolator in reverse, achieving an isolation effect. That is, the multi-channel isolator is also used to achieve signal isolation.

[0051] Multiple groups of independent preamplifiers (preamplifiers 1-N) are exactly the same, and they mainly complete the amplification and filtering of ultrasonic echo signals received by corresponding connected array elements of the phased array electromagnetic ultrasonic sensor, and finally input the signals into the data processing module through analog-to-digital conversion.

[0052] The data processing module performs data calculations according to the set algorithm, obtains material defect information and transmits it to the main control module for processing.

[0053] The main control module is mainly responsible for pulse emission, system parameter adjustment, and transmitting material defect information to the display module for display.

[0054] The display module is mainly responsible for displaying test results, defects, etc.

[0055] The present application greatly improves the electromagnetic ultrasound excitation energy and reduces the imaging calculation amount, thereby improving the instrument signal-to-noise ratio, imaging speed and imaging clarity while reducing hardware requirements.

[0056] In another exemplary embodiment of the present application, Figure 2 As shown, an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method is provided, and the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method is applied to the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging described above, and the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method includes the following contents.

[0057] A1: Based on a forward pulse, a first ultrasonic wave is obtained; the first ultrasonic wave is an ultrasonic wave excited by exciting a plurality of array elements of a phased array electromagnetic ultrasonic sensor according to a specified delay rule.

[0058] A2: According to the first ultrasonic wave, a first ultrasonic echo is obtained; the first ultrasonic echo is an echo generated when the first ultrasonic wave contacts the measured area.

[0059] A3: Amplify, filter, and perform analog-to-digital conversion on the first ultrasonic echo to obtain a first data set.

[0060] A4: Based on the reverse pulse, a second ultrasonic wave is obtained; the second ultrasonic wave is an ultrasonic wave excited by exciting a plurality of array elements of a phased array electromagnetic ultrasonic sensor according to a specified delay rule.

[0061] A5: According to the second ultrasonic wave, a second ultrasonic echo is obtained; the second ultrasonic echo is an echo generated when the second ultrasonic wave contacts the measured area.

[0062] A6: Amplify, filter, and perform analog-to-digital conversion on the second ultrasonic echo to obtain a second data set.

[0063] A7: Add the first data set and the second data set to obtain a total data set; the total data set includes collected data of a plurality of array elements.

[0064] A8: Determine the total superimposed echo amplitude at any position in the measured area according to the total data set and the detection coordinate system; the detection coordinate system is a coordinate system established with the center of the first array element; obtain material defect information according to the total superimposed echo amplitude.

[0065] As an optional implementation, the calculation formula for the collected data of each array element is as follows.

[0066] (1).

[0067] in, For the i The array element t The amplitude of the wave collected at each moment, i For the i Array elements, t is the time elapsed from the start of excitation, For the i The array element t Mathematical function expression of data collected at all times.

[0068] As an optional implementation, the calculation formula for the total superimposed echo amplitude at any position in the measured area is as follows.

[0069] (2).

[0070] in, is the total superimposed echo amplitude at any position in the measured area, For the i The array element The amplitude of the wave collected at each moment, N is the total number of array elements, For the i The time required for each array element to excite the ultrasonic wave to propagate to any position in the measured area. Any position in the measured area x Coordinate values, Any position in the measured area y Coordinate values, i For the i Array elements, V is the propagation speed of ultrasonic wave in the measured component, S is the spacing between adjacent array elements.

[0071] As an optional implementation, the electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging method further includes: storing the first data set and the second data set.

[0072] As an optional implementation, the electromagnetic ultrasonic phased array high-energy excitation and full-area high-speed focusing imaging method also includes the following contents.

[0073] A9: Determine the measured area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude.

[0074] A10: Display the detected area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude in a color map to obtain a final detection result map.

[0075] As an optional implementation, step A10 specifically includes the following contents.

[0076] A101: The minimum value and the maximum value of the total superimposed echo amplitude are respectively corresponded to a colorbar with a continuous gradient from blue to red.

[0077] A102: Establish a one-to-one correspondence between the total superimposed echo amplitude and the pixel color value to obtain a final detection result graph.

[0078] Specifically, the instrument excitation receiving method is as follows.

[0079] 1. The fourth program-controlled switch S4 and the second program-controlled switch S2 are closed, the first program-controlled switch S1 and the third program-controlled switch S3 are opened, the differential isolation high-voltage pulse transmitter sends a specified number of cycle high-voltage pulses, and the second program-controlled switch S2 emits a positive pulse, such as Figure 3 As shown; at this time, the phased array electromagnetic ultrasonic sensor starts to work, and the array elements 1~N of the phased array electromagnetic ultrasonic sensor excite ultrasonic waves according to the specified delay law. The ultrasonic echoes received by each array element are amplified by the preamplifiers 1~N connected thereto, and then collected simultaneously and sent to the data processing module for storage. Suppose the data set of each channel at this time is data set A.

[0080] Compared with the excitation of a single array element, the simultaneous excitation of each array element will excite a higher energy ultrasonic signal. In addition, the instrument structure is simpler, the volume and power consumption are lower, so that the excitation energy can be more focused on the defect, which can improve the detection sensitivity and signal-to-noise ratio.

[0081] 2. The fourth program-controlled switch S4 and the second program-controlled switch S2 are opened, the first program-controlled switch S1 and the third program-controlled switch S3 are closed, the differential isolation high-voltage pulse transmitter sends the same pulse as in step 1, and S3 transmits the same negative pulse as in step 1, such as Figure 4 As shown; at this time, the phased array electromagnetic ultrasonic sensor starts to work, and the array elements 1~N of the phased array electromagnetic ultrasonic sensor excite ultrasonic waves according to the specified delay law. The ultrasonic echoes received by each array element are amplified by the preamplifier 1~N connected to it, and then collected and sent to the data processing module for storage. Suppose the data set of each channel at this time is data set B.

[0082] 3. Add the corresponding channel data of data set A and data set B to obtain data C.

[0083] Since data set A and data set B are high-voltage pulse excitations with the same parameters but opposite amplitudes, the addition of data set A and data set B in data C will offset the inherent noise in the excitation circuit, thereby improving the signal-to-noise ratio and resolution.

[0084] Compared with the traditional phased array, which excites the probes one by one according to the delay rule, the work efficiency is improved. At the same time, the amount of collected data is greatly reduced, which reduces the subsequent calculation amount, improves the detection efficiency and reduces the hardware requirements.

[0085] 4. The calculation steps of the imaging method are as follows.

[0086] The first step is to establish a detection coordinate system; the detection coordinate system is a coordinate system established with the center of the first array element; the detection coordinate system is as follows Figure 5 As shown, any point in the specimen is .

[0087] Data C contains synchronously collected data of all channels. The calculation formula for the collected data corresponding to each array element 1 to N in data C is shown in formula (1).

[0088] The second step is to calculate the total superimposed echo amplitude at any position in the measured area according to formula (2).

[0089] The third step is to display the imaging results in color.

[0090] The minimum and maximum values ​​of the total superimposed echo amplitude in the imaging area are respectively matched to the colorbar with a continuous gradient from blue to red, and a one-to-one correspondence between the total superimposed echo amplitude in the imaging area and the pixel color value is established. The final detection result is shown in the figure below. Figure 7 shown.

[0091] For example, Figure 6 The defective test block is imaged as shown. Using the common imaging algorithm, the following Figure 8 The detection results of the present invention are as follows: Figure 7 As shown, the imaging is clear, without artifacts, the hole shape is not distorted, and the detection result is good.

[0092] The present application greatly improves the electromagnetic ultrasound excitation energy and reduces the imaging calculation amount, thereby improving the instrument signal-to-noise ratio, imaging speed and imaging clarity while reducing hardware requirements.

[0093] The present application also provides an application scenario, which applies the above-mentioned electromagnetic ultrasonic phased array high-energy excitation and full-domain high-speed focusing imaging method. Specifically: the electromagnetic ultrasonic phased array high-energy excitation and full-domain high-speed focusing imaging method provided in this embodiment can be applied in ultrasonic non-destructive testing scenarios. The ultrasonic nondestructive testing scenario includes: a forward pulse detection link, a reverse pulse detection link and a defect detection link; first, based on the forward pulse, a first ultrasonic wave is obtained, and according to the first ultrasonic wave, a first ultrasonic echo is obtained; the first ultrasonic echo is the echo generated when the first ultrasonic wave contacts the measured area; the first ultrasonic echo is amplified, filtered and analog-to-digital converted to obtain a first data set; then, based on the reverse pulse, a second ultrasonic wave is obtained; according to the second ultrasonic wave, a second ultrasonic echo is obtained; the second ultrasonic echo is the echo generated when the second ultrasonic wave contacts the measured area; the second ultrasonic echo is amplified, filtered and analog-to-digital converted to obtain a second data set; finally, the first data set and the second data set are added to obtain a total data set; according to the total data set and the detection coordinate system, the total superimposed echo amplitude at any position in the measured area is determined; according to the total superimposed echo amplitude, material defect information can be obtained.

[0094] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. An electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging device, characterized in that: The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device comprises: a differential isolation high-voltage pulse transmitter, a first programmable switch, a second programmable switch, a third programmable switch, a fourth programmable switch, a multi-channel isolator, a phased array electromagnetic ultrasonic sensor, a plurality of preamplifiers and a data processing module; The positive pole of the differential isolated high-voltage pulse transmitter is connected to the first program-controlled switch and the second program-controlled switch, and the negative pole of the differential isolated high-voltage pulse transmitter is connected to the third program-controlled switch and the fourth program-controlled switch; when the differential isolated high-voltage pulse transmitter transmits a pulse, if the fourth program-controlled switch and the second program-controlled switch are closed, the first program-controlled switch and the third program-controlled switch are disconnected, and a positive pulse is transmitted from the second program-controlled switch; if the fourth program-controlled switch and the second program-controlled switch are disconnected, the first program-controlled switch and the third program-controlled switch are closed, and a negative pulse is transmitted from the third program-controlled switch; The second program-controlled switch and the third program-controlled switch are respectively connected to the multi-channel isolator; The phased array electromagnetic ultrasonic sensor includes a plurality of array elements connected in parallel; The multi-channel isolator includes a plurality of delay timers connected in parallel; each of the delay timers is connected to a corresponding array element, respectively, to control the delay of each array element; Based on the positive pulse and the negative pulse, each array element excites a first ultrasonic wave and a second ultrasonic wave according to a specified delay; When the first ultrasonic wave and the second ultrasonic wave contact the measured area, a first ultrasonic echo and a second ultrasonic echo are generated, and each array element receives the first ultrasonic echo and the second ultrasonic echo; for each array element, the received first ultrasonic echo corresponds to the emitted first ultrasonic wave, and the received second ultrasonic echo corresponds to the emitted second ultrasonic wave; Each of the preamplifiers is connected to a corresponding array element, and is used to amplify, filter, and perform analog-to-digital conversion on the first ultrasonic echo and the second ultrasonic echo to obtain a first data set and a second data set; The data processing module is connected to each of the preamplifiers, respectively, and is used to add the first data set and the second data set to obtain a total data set; determine the total superimposed echo amplitude at any position in the measured area according to the total data set and the detection coordinate system; obtain material defect information according to the total superimposed echo amplitude; the total data set includes the collected data of several array elements; the detection coordinate system is a coordinate system established with the center of the first array element.

2. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device according to claim 1, characterized in that: The multi-channel isolator is also used to achieve signal isolation.

3. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device according to claim 1, characterized in that: The electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging device also includes: The main control module is connected to the differential isolation high-voltage pulse transmitter and the data processing module respectively, and is used to control the differential isolation high-voltage pulse transmitter to transmit pulses, adjust the parameters of the differential isolation high-voltage pulse transmitter and the data processing module, and also to receive the material defect information and process it.

4. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device according to claim 3, characterized in that: The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device further includes: a display module; The main control module is connected to the display module, and is also used to display the tested area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude in a color map to obtain a final test result map.

5. A method for high-energy excitation and global high-speed focusing imaging of an electromagnetic ultrasonic phased array, characterized in that: The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method is applied to the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device as claimed in any one of claims 1 to 4, and the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method comprises: Based on the forward pulse, a first ultrasonic wave is obtained; the first ultrasonic wave is an ultrasonic wave excited by exciting a plurality of array elements of a phased array electromagnetic ultrasonic sensor according to a specified delay law; According to the first ultrasonic wave, a first ultrasonic echo is obtained; the first ultrasonic echo is an echo generated when the first ultrasonic wave contacts the measured area; amplifying, filtering, and analog-to-digital converting the first ultrasonic echo to obtain a first data set; Based on the reverse pulse, a second ultrasonic wave is obtained; the second ultrasonic wave is an ultrasonic wave excited by a plurality of array elements of a phased array electromagnetic ultrasonic sensor according to a specified delay law; According to the second ultrasonic wave, a second ultrasonic echo is obtained; the second ultrasonic echo is an echo generated when the second ultrasonic wave contacts the measured area; amplifying, filtering, and performing analog-to-digital conversion on the second ultrasonic echo to obtain a second data set; Adding the first data set and the second data set to obtain a total data set; the total data set includes the collected data of a plurality of array elements; The total superimposed echo amplitude at any position in the measured area is determined according to the total data set and the detection coordinate system; the detection coordinate system is a coordinate system established with the center of the first array element; and the material defect information is obtained according to the total superimposed echo amplitude.

6. The electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging method according to claim 5, characterized in that: The calculation formula for the collected data of each array element is: ； in, For the i The array element t The amplitude of the wave collected at each moment, i For the i Array element, t is the time elapsed from the start of excitation, For the i The array element t Mathematical function expression of data collected at all times.

7. The electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging method according to claim 5, characterized in that: The calculation formula for the total superimposed echo amplitude at any position in the measured area is: ； in, is the total superimposed echo amplitude at any position in the measured area, For the i The array element The amplitude of the wave collected at each moment, N is the total number of array elements, For the i The time required for each array element to excite the ultrasonic wave to propagate to any position in the measured area. Any position in the measured area x Coordinate values, Any position in the measured area y Coordinate values, i For the i Array elements, V is the propagation speed of ultrasonic wave in the measured component, S is the distance between adjacent array elements.

8. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method according to claim 5, characterized in that: The electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging method also includes: The first data set and the second data set are stored.

9. The electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging method according to claim 5, characterized in that: The electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging method also includes: Determine the measured area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude; The detected areas corresponding to the minimum and maximum values ​​of the total superimposed echo amplitude are displayed in a color map to obtain a final detection result map.

10. The electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging method according to claim 9, characterized in that: The detected area corresponding to the minimum and maximum values ​​of the total superimposed echo amplitude is displayed in a color map to obtain the final detection result map, which specifically includes: The minimum and maximum values ​​of the total superimposed echo amplitude are respectively corresponded to the colorbar with a continuous gradient from blue to red; A one-to-one correspondence between the total superimposed echo amplitude and the pixel color value is established to obtain a final detection result graph.

Images