CN119310188B - Electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging device and method - Google Patents
Electromagnetic ultrasonic phased array high-energy excitation and full-range high-speed focusing imaging device and method Download PDFInfo
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Abstract
The application discloses an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device and method, which relate to the technical field of ultrasonic nondestructive testing, wherein the device comprises a differential isolation high-voltage pulse transmitter, a first program-controlled switch, a second program-controlled switch, a third program-controlled switch, a fourth program-controlled switch, a multichannel isolator, a phased array electromagnetic ultrasonic sensor, a plurality of preamplifiers and a data processing module; by controlling the program-controlled switch, positive pulse and negative pulse can be transmitted, so that two high-voltage pulse excitation data sets with the same parameters and the right opposite amplitude can be obtained, and the two data sets can be added to offset the inherent noise on the excitation loop, thereby improving the signal-to-noise ratio and the resolution ratio of the signal. Compared with the traditional phased array which is excited one by one according to a delay rule, the method has the advantages that the method only needs to excite twice, the speed is high, the working efficiency is improved, the acquired data volume is greatly reduced, the subsequent calculated volume is reduced, the detection efficiency is improved, and the requirement on hardware is reduced.
Description
Technical Field
The application relates to the technical field of ultrasonic nondestructive testing, in particular to an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device and method.
Background
Compared with a single-channel ultrasonic detector, the piezoelectric ultrasonic phased array technology has higher defect detection resolution, is a relatively mature technology at present, and a plurality of piezoelectric ultrasonic phased array detection technologies and instruments are also arranged on the market, wherein the instruments mainly comprise a multichannel delay excitation module, a multichannel high-voltage excitation module, a multichannel acquisition module and a high-speed data processing module, and have high detection speed and high detection precision.
The electromagnetic ultrasonic phased array detection has the advantages of non-contact and no need of polishing, has wider application range compared with piezoelectric ultrasonic, has a plurality of electromagnetic ultrasonic phased array technical proposal, and mainly adopts the piezoelectric phased array technical proposal at present, including channel delay rule setting and excitation receiving mode. However, the piezoelectric phased array transducer has high transduction efficiency, the required excitation voltage is low, the gain of a signal echo amplifier is small, the difficulty of realizing a piezoelectric ultrasonic phased array is low, the electromagnetic ultrasonic transducer has low transduction efficiency due to the fact that the coil is used for realizing electric-magnetic-acoustic transduction, the excitation of the electromagnetic ultrasonic transducer needs a relatively large voltage and a high-gain high-signal-to-noise ratio echo signal conditioning circuit, and the electromagnetic ultrasonic signal needs multiple times of averaging to obtain a good signal-to-noise ratio, so that the electromagnetic ultrasonic phased array has higher difficulty compared with the piezoelectric ultrasonic phased array, and meanwhile, the electromagnetic ultrasonic phased array needs larger volume and larger operation amount.
Disclosure of Invention
The application aims to provide an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device and method, which can improve electromagnetic ultrasonic excitation energy and reduce imaging operand, and improve the signal-to-noise ratio, imaging speed and imaging definition of an instrument under the condition of reducing hardware requirements.
In order to achieve the above object, the present application provides the following.
The application provides an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device which comprises a differential isolation high-voltage pulse emitter, a first program-controlled switch, a second program-controlled switch, a third program-controlled switch, a fourth program-controlled switch, a multichannel isolator, a phased array electromagnetic ultrasonic sensor, a plurality of preamplifiers and a data processing module.
The positive pole of the differential isolation high-voltage pulse transmitter is connected with the first program-controlled switch and the second program-controlled switch, the negative pole of the differential isolation high-voltage pulse transmitter is connected with the third program-controlled switch and the fourth program-controlled switch, when the differential isolation high-voltage pulse transmitter transmits pulses, 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 opened, positive pulses are transmitted on the second program-controlled switch, and if the fourth program-controlled switch and the second program-controlled switch are opened, the first program-controlled switch and the third program-controlled switch are closed, and negative pulses are transmitted on the third program-controlled switch.
The second program-controlled switch and the third program-controlled switch are respectively connected with the multichannel isolator.
The phased array electromagnetic ultrasonic sensor comprises a plurality of array elements which are connected in parallel.
The multichannel isolator comprises a plurality of delay timers connected in parallel, wherein each delay timer is respectively connected with a corresponding array element and used for controlling the delay of each array element.
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.
When the first ultrasonic wave and the second ultrasonic wave contact the detected area, a first ultrasonic echo and a second ultrasonic echo are generated, the first ultrasonic echo and the second ultrasonic echo are received by each array element, and for each array element, the received first ultrasonic echo corresponds to the sent first ultrasonic wave, and the received second ultrasonic echo corresponds to the sent second ultrasonic wave.
Each pre-amplifier is respectively connected with a corresponding array element and is used for amplifying, filtering and analog-to-digital converting 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 respectively connected with each pre-amplifier and is used for adding the first data set and the second data set to obtain a total data set, determining total superposition echo amplitude values of any positions in a detected area according to the total data set and a detection coordinate system, obtaining material defect information according to the total superposition echo amplitude values, wherein the total data set comprises acquisition data of a plurality of array elements, and the detection coordinate system is a coordinate system established by the center of the first array element.
In a second aspect, the present application provides an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method, which is applied to the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device, and the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method includes the following steps.
Based on the forward pulse, acquiring first ultrasonic waves which are ultrasonic waves excited by a plurality of array elements of the excitation phased array electromagnetic ultrasonic sensor according to a specified delay rule.
And acquiring a first ultrasonic echo according to the first ultrasonic wave, wherein the first ultrasonic echo is generated when the first ultrasonic wave contacts the detected area.
Amplifying, filtering and analog-to-digital converting the first ultrasonic echo to obtain a first data set.
And acquiring second ultrasonic waves based on reverse pulse, wherein the second ultrasonic waves are ultrasonic waves excited by a plurality of array elements of the excitation phased array electromagnetic ultrasonic sensor according to a specified delay rule.
And acquiring a second ultrasonic echo according to the second ultrasonic wave, wherein the second ultrasonic echo is generated when the second ultrasonic wave contacts the detected area.
And amplifying, filtering and analog-to-digital converting the second ultrasonic echo to obtain a second data set.
And adding the first data set and the second data set to obtain a total data set, wherein the total data set comprises acquisition data of a plurality of array elements.
And determining the total superimposed echo amplitude of any position in the detected area according to the total data set and a detection coordinate system, wherein the detection coordinate system is a coordinate system established by the center of the first array element, and obtaining the material defect information according to the total superimposed echo amplitude.
According to the specific embodiments provided by the application, the following technical effects are disclosed.
The application provides an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device and method, wherein the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device comprises a differential isolation high-voltage pulse emitter, a first program-controlled switch, a second program-controlled switch, a third program-controlled switch, a fourth program-controlled switch, a multichannel isolator, a phased array electromagnetic ultrasonic sensor, a plurality of preamplifiers and a data processing module; by controlling the program-controlled switch, positive pulse and negative pulse can be transmitted, so that two high-voltage pulse excitation data sets with the same parameters and the right opposite amplitude can be obtained, and the two data sets can be added to offset the inherent noise on the excitation loop, thereby improving the signal-to-noise ratio and the resolution ratio of the signal. Compared with the traditional phased array which is excited one by one according to a delay rule, the method has the advantages that the method only needs to excite twice, the speed is high, the working efficiency is improved, the acquired data volume is greatly reduced, the subsequent calculated volume is reduced, the detection efficiency is improved, and the requirement on hardware is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device according to an embodiment of the application.
Fig. 2 is a schematic flow chart of an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method according to an embodiment of the application.
Fig. 3 is a schematic diagram of forward pulse excitation according to an embodiment of the present application.
Fig. 4 is a schematic diagram of reverse pulse excitation according to an embodiment of the present application.
Fig. 5 is a schematic diagram of a detection coordinate system according to an embodiment of the application.
FIG. 6 is a schematic diagram of a defective test block according to an embodiment of the present application.
FIG. 7 is a schematic diagram of the detection results using the imaging method of the present application.
Fig. 8 is a schematic diagram of the detection result using a conventional phased array program algorithm.
Detailed Description
The following description of the embodiments of the present application 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 application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description.
In one exemplary embodiment, as shown in FIG. 1, an electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device is provided, which comprises a differential isolation high-voltage pulse emitter, 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.
The positive pole of the differential isolation high-voltage pulse transmitter is connected with the first programmable switch S1 and the second programmable switch S2, the negative pole of the differential isolation high-voltage pulse transmitter is connected with the third programmable switch S3 and the fourth programmable switch S4, when the differential isolation high-voltage pulse transmitter transmits pulses, 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 opened, positive pulses are transmitted on the second programmable switch S2, and if the fourth programmable switch S4 and the second programmable switch S2 are opened, the first programmable switch S1 and the third programmable switch S3 are closed, and negative pulses are transmitted on the third programmable switch S3.
The second programmable switch S2 and the third programmable switch S3 are respectively connected with the multichannel isolator.
The phased array electromagnetic ultrasonic sensor comprises a plurality of array elements which are connected in parallel, and each array element is an independent coil and can independently receive ultrasonic signals.
The multichannel isolator comprises a plurality of delay timers connected in parallel, wherein each delay timer is respectively connected with a corresponding array element and used for controlling the delay of each array element.
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.
When the first ultrasonic wave and the second ultrasonic wave contact the detected area, a first ultrasonic echo and a second ultrasonic echo are generated, the first ultrasonic echo and the second ultrasonic echo are received by each array element, and for each array element, the received first ultrasonic echo corresponds to the sent first ultrasonic wave, and the received second ultrasonic echo corresponds to the sent second ultrasonic wave.
Each pre-amplifier is respectively connected with a corresponding array element and is used for amplifying, filtering and analog-to-digital converting 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 respectively connected with each pre-amplifier and is used for adding the first data set and the second data set to obtain a total data set, determining total superposition echo amplitude values of any positions in a detected area according to the total data set and a detection coordinate system, obtaining material defect information according to the total superposition echo amplitude values, wherein the total data set comprises acquisition data of a plurality of array elements, and the detection coordinate system is a coordinate system established by the center of the first array element.
As an optional implementation mode, the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device further comprises a main control module which is respectively connected with the differential isolation high-voltage pulse emitter and the data processing module and used for controlling the differential isolation high-voltage pulse emitter to emit pulses and adjusting parameters of the data processing module.
As an alternative implementation mode, the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device further comprises a display module.
And the main control module is connected with the display module and is also used for displaying the detected area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude in a color image mode to obtain a final detection result image.
The output end of the differential isolation high-voltage pulse transmitter is in a differential isolation mode, namely, the positive end and the negative end of the output end of the high-voltage pulse transmitter are not connected with the system ground.
The multichannel isolator comprises a delay timer, when a trigger signal is excited, each array element excites the array element of each phased array electromagnetic ultrasonic sensor to emit according to self delay, so that directional high-energy ultrasonic waves in a specified direction are formed, and the array elements of each phased array electromagnetic ultrasonic sensor are isolated, so that the receiving signals among the array elements can be mutually independent, and crosstalk does not occur. The high-voltage pulse transmitter can allow high-voltage pulses (generally tens of volts to thousands of volts) transmitted by the high-voltage pulse transmitter to be input into each array element of the phased array electromagnetic ultrasonic sensor, and excite each array element of the phased array electromagnetic ultrasonic sensor to work. Weak ultrasonic signals received by each array element of the phased array electromagnetic ultrasonic sensor cannot reversely pass through the multichannel isolator, so that an isolation effect is achieved. I.e. the multi-channel isolator is also used to achieve signal isolation.
The multiple groups of independent preamplifiers (preamplifiers 1-N) are identical, and are mainly used for amplifying and filtering ultrasonic echo signals received by array elements correspondingly connected with the phased array electromagnetic ultrasonic sensor, and finally, the ultrasonic echo signals are input into the data processing module through analog-to-digital conversion.
The data processing module performs data calculation according to a set algorithm to obtain material defect information and transmits the material defect information to the main control module for processing.
The main control module is mainly responsible for pulse emission, system parameter adjustment and material defect information transmission to the display module for display.
The display module is mainly responsible for displaying detection results, defects and the like.
The application greatly improves the electromagnetic ultrasonic excitation energy, reduces the imaging operation amount, and improves the signal-to-noise ratio, the imaging speed and the imaging definition of the instrument under the condition of reducing the hardware requirement.
In another exemplary embodiment of the present application, as shown in fig. 2, 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 includes the following matters.
A1, acquiring first ultrasonic waves based on forward pulse, wherein the first ultrasonic waves are ultrasonic waves excited by a plurality of array elements for exciting a phased array electromagnetic ultrasonic sensor according to a specified delay rule.
A2, acquiring a first ultrasonic echo according to the first ultrasonic wave, wherein the first ultrasonic echo is generated when the first ultrasonic wave contacts a detected area.
And A3, amplifying, filtering and analog-to-digital converting the first ultrasonic echo to obtain a first data set.
And A4, acquiring second ultrasonic waves based on reverse pulse, wherein the second ultrasonic waves are ultrasonic waves excited by a plurality of array elements for exciting the phased array electromagnetic ultrasonic sensor according to a specified delay rule.
And A5, acquiring a second ultrasonic echo according to the second ultrasonic wave, wherein the second ultrasonic echo is generated when the second ultrasonic wave contacts the detected area.
And A6, amplifying, filtering and analog-to-digital converting the second ultrasonic echo to obtain a second data set.
A7, adding the first data set and the second data set to obtain a total data set, wherein the total data set comprises acquisition data of a plurality of array elements.
A8, determining the total superimposed echo amplitude of any position in the detected area according to the total data set and a detection coordinate system, wherein the detection coordinate system is a coordinate system established by the center of the first array element, and obtaining the material defect information according to the total superimposed echo amplitude.
As an alternative embodiment, the calculation formula of the acquired data of each array element is as follows.
(1)。
Wherein, The amplitude of the wave acquired by the ith array element at the moment t, i is the ith array element, t is the time elapsed from the start of excitation,And (5) acquiring mathematical function expression of data at the time t for the ith array element.
As an alternative embodiment, the calculation formula of the total superimposed echo amplitude of any position in the detected area is as follows.
(2)。
Wherein, For the total superimposed echo amplitude at any location within the region being examined,For the ith array elementThe amplitude of the wave collected at the moment, N is the total array element number,The time required for the ultrasonic wave to be excited by the ith array element to propagate to any position in the detected area,For x coordinate values at any location within the region being measured,For y coordinate values of any position in the detected area, i is the ith array element, V is the propagation speed of ultrasonic waves in the detected part, and S is the interval between adjacent array elements.
As an alternative implementation mode, the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method further comprises the step of storing the first data set and the second data set.
As an optional implementation manner, the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method further comprises the following content.
A9, determining the measured area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude.
A10, displaying the detected area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude in a color image mode to obtain a final detection result image.
As an alternative embodiment, in step a10, the following is specifically included.
A101, respectively corresponding the minimum value and the maximum value of the total superimposed echo amplitude value to the continuous gradual change colorbar from blue to red.
And A102, establishing a one-to-one correspondence relation between the total superimposed echo amplitude and the pixel color value to obtain a final detection result graph.
Specifically, the instrument excitation reception method is as follows.
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 emitter sends high-voltage pulses with specified cycle numbers, positive pulses are emitted on the second program-controlled switch S2, as shown in figure 3, at the moment, the phased array electromagnetic ultrasonic sensor starts to work, array elements 1-N of the phased array electromagnetic ultrasonic sensor excite ultrasonic waves according to a specified time delay rule, ultrasonic echoes received by the array elements are amplified by preamplifiers 1-N connected with the ultrasonic echoes and then are simultaneously collected and then sent to the data processing module for storage, and at the moment, the data set of each channel is set A.
Each array element is excited simultaneously, compared with the excitation of a single array element, ultrasonic signals with higher energy are excited, the instrument framework is simpler, the volume power consumption is lower, the excitation energy is more focused at the defect position, and the detection sensitivity and the signal-to-noise ratio can be improved.
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 transmits the pulse same as the step 1, the negative pulse same as the step 1 is transmitted on the S3, as shown in fig. 4, at the moment, the phased array electromagnetic ultrasonic sensor starts to work, the array elements 1-N of the phased array electromagnetic ultrasonic sensor excite ultrasonic waves according to a specified time delay rule, the ultrasonic echoes received by the array elements are amplified by the preamplifiers 1-N connected with the ultrasonic echoes and then are simultaneously collected and then transmitted to the data processing module for storage, and at the moment, the data set of each channel is the data set B.
3. And adding the data of each channel corresponding to the data set A and the data set B to obtain data C.
Because the data set A and the data set B are high-voltage pulse excitation with the same parameters and the right opposite amplitude, the inherent noise on the excitation loop is counteracted by adding the data set A and the data set B in the data C, and the signal-to-noise ratio and the resolution of the signal are improved.
Compared with the traditional phased array, the method has the advantages that the probes are excited one by one according to the delay rule, the working efficiency is improved, the acquired data volume is greatly reduced, the subsequent calculated volume is reduced, the detection efficiency is improved, and the requirement on hardware is reduced.
4. The imaging method comprises the following calculation steps.
The first step, a detection coordinate system is established, wherein the detection coordinate system is established by a first array center, the detection coordinate system is shown as figure 5, and any position point in the test piece is。
The data C comprises synchronous acquisition data of all channels, and a calculation formula of the acquisition data corresponding to each array element 1-N in the data C is shown as a formula (1).
And secondly, calculating the total superposition echo amplitude of any position in the detected area according to a formula (2).
And thirdly, displaying the imaging result in a color image mode.
And respectively corresponding the minimum value and the maximum value of the total superimposed echo amplitude of the imaging region to the continuous gradual change colorbar from blue to red, and establishing a one-to-one correspondence relationship between the total superimposed echo amplitude of the imaging region and the pixel color value to obtain a final detection result diagram as shown in fig. 7.
For example imaging a defective test block as shown in fig. 6. The detection result as in fig. 8 is obtained using a general imaging algorithm, which images the defect distortion and the occurrence of the artifact. The detection result of the detection method is shown in fig. 7, the imaging is clear, no artifact exists, the shape of the hole is not distorted, and the detection result is good.
The application greatly improves the electromagnetic ultrasonic excitation energy, reduces the imaging operation amount, and improves the signal-to-noise ratio, the imaging speed and the imaging definition of the instrument under the condition of reducing the hardware requirement.
The application also provides an application scene, which applies the electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method provided by the embodiment can be applied to an ultrasonic nondestructive testing scene. The ultrasonic nondestructive testing scene comprises a forward pulse testing link, a reverse pulse testing link and a defect testing link, wherein first ultrasonic waves are obtained based on the forward pulse, first ultrasonic echoes are obtained according to the first ultrasonic waves, the first ultrasonic echoes are echoes generated when the first ultrasonic waves contact a tested area, the first ultrasonic echoes are amplified, filtered and subjected to analog-to-digital conversion to obtain a first data set, second ultrasonic waves are obtained based on the reverse pulse, second ultrasonic echoes are obtained according to the second ultrasonic waves, the second ultrasonic echoes are echoes generated when the second ultrasonic waves contact the tested area, the second ultrasonic echoes are amplified, filtered and subjected to analog-to-digital conversion to obtain a second data set, finally, the first data set and the second data set are added to obtain a total data set, the total superposition echo amplitude of any position in the tested area is determined according to the total data set and a testing coordinate system, and material defect information can be obtained according to the total superposition echo amplitude.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The principles and embodiments of the present application have been described herein with reference to specific examples, which are intended to facilitate an understanding of the principles and concepts of the application and are to be varied in scope and detail by persons of ordinary skill in the art based on the teachings herein. In view of the foregoing, this description should not be construed as limiting the application.
Claims (10)
1. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device is characterized by comprising a differential isolation high-voltage pulse emitter, a first program-controlled switch, a second program-controlled switch, a third program-controlled switch, a fourth program-controlled 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 isolation high-voltage pulse transmitter is connected with the first program-controlled switch and the second program-controlled switch, the negative pole of the differential isolation high-voltage pulse transmitter is connected with the third program-controlled switch and the fourth program-controlled switch, when the differential isolation high-voltage pulse transmitter transmits pulses, 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 opened, the second program-controlled switch transmits positive pulses, and if the fourth program-controlled switch and the second program-controlled switch are opened, the first program-controlled switch and the third program-controlled switch are closed, and the third program-controlled switch transmits negative pulses;
the second program-controlled switch and the third program-controlled switch are respectively connected with the multichannel isolator;
the phased array electromagnetic ultrasonic sensor comprises a plurality of array elements which are connected in parallel;
Each delay timer is respectively connected with a corresponding array element and used for controlling 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 a detected area, generating a first ultrasonic echo and a second ultrasonic echo, and receiving the first ultrasonic echo and the second ultrasonic echo by each array element;
Each preamplifier is connected with a corresponding array element and is used for amplifying, filtering and analog-to-digital converting 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 respectively connected with each pre-amplifier and is used for adding the first data set and the second data set to obtain a total data set, determining total superposition echo amplitude values of any positions in a detected area according to the total data set and a detection coordinate system, obtaining material defect information according to the total superposition echo amplitude values, wherein the total data set comprises acquisition data of a plurality of array elements, and the detection coordinate system is a coordinate system established by the center of the first array element.
2. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging apparatus of claim 1, wherein the multi-channel isolator is further configured to achieve signal isolation.
3. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging apparatus of claim 1, further comprising:
the main control module is respectively connected with the differential isolation high-voltage pulse emitter and the data processing module and is used for controlling the differential isolation high-voltage pulse emitter to emit pulses, adjusting parameters of the differential isolation high-voltage pulse emitter and the data processing module and receiving and processing the material defect information.
4. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging device according to claim 3, further comprising a display module;
And the main control module is connected with the display module and is also used for displaying the detected area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude in a color image mode to obtain a final detection result image.
5. An electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method, which is 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 1-4, and comprises the following steps:
acquiring first ultrasonic waves based on forward pulse, wherein the first ultrasonic waves are ultrasonic waves excited by a plurality of array elements of an excitation phased array electromagnetic ultrasonic sensor according to a specified delay rule;
Acquiring a first ultrasonic echo according to the first ultrasonic wave, wherein the first ultrasonic echo is generated when the first ultrasonic wave contacts a region to be detected;
amplifying, filtering and analog-to-digital converting the first ultrasonic echo to obtain a first data set;
Acquiring second ultrasonic waves based on reverse pulse, wherein the second ultrasonic waves are ultrasonic waves excited by a plurality of array elements of the excitation phased array electromagnetic ultrasonic sensor according to a specified delay rule;
Acquiring a second ultrasonic echo according to the second ultrasonic wave, wherein the second ultrasonic echo is generated when the second ultrasonic wave contacts a region to be detected;
Amplifying, filtering and analog-to-digital converting 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, wherein the total data set comprises acquisition data of a plurality of array elements;
And determining the total superimposed echo amplitude of any position in the detected area according to the total data set and a detection coordinate system, wherein the detection coordinate system is a coordinate system established by the center of the first array element, and obtaining the material defect information according to the total superimposed echo amplitude.
6. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method according to claim 5, wherein the calculation formula of the acquired data of each array element is as follows:
;
wherein, The amplitude of the wave acquired by the ith array element at the moment t, i is the ith array element, t is the time elapsed from the start of excitation,And (5) acquiring mathematical function expression of data at the time t for the ith array element.
7. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method according to claim 5, wherein the calculation formula of the total superimposed echo amplitude of any position in the detected area is:
;
wherein, For the total superimposed echo amplitude at any location within the region being examined,For the ith array elementThe amplitude of the wave collected at the moment, N is the total array element number,The time required for the ultrasonic wave to be excited by the ith array element to propagate to any position in the detected area,For x coordinate values at any location within the region being measured,For y coordinate values of any position in the detected area, i is the ith array element, V is the propagation speed of ultrasonic waves in the detected part, and S is the interval between adjacent array elements.
8. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method of claim 5, further comprising:
storing the first data set and the second data set.
9. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method of claim 5, further comprising:
determining a detected area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude;
And displaying the detected area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude in a color image mode to obtain a final detection result image.
10. The electromagnetic ultrasonic phased array high-energy excitation and global high-speed focusing imaging method of claim 9, wherein the detected area corresponding to the minimum value and the maximum value of the total superimposed echo amplitude is displayed in a color image mode to obtain a final detection result image, and the method specifically comprises the following steps:
respectively corresponding the minimum value and the maximum value of the total superimposed echo amplitude to a blue-to-red continuous gradual change colorbar;
and establishing a one-to-one correspondence relation between the total superimposed echo amplitude and the pixel color value to obtain a final detection result graph.
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