CN110045021A - Electromagnetic acoustic phased array detection system - Google Patents
Electromagnetic acoustic phased array detection system Download PDFInfo
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- CN110045021A CN110045021A CN201910447618.5A CN201910447618A CN110045021A CN 110045021 A CN110045021 A CN 110045021A CN 201910447618 A CN201910447618 A CN 201910447618A CN 110045021 A CN110045021 A CN 110045021A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2412—Probes using the magnetostrictive properties of the material to be examined, e.g. electromagnetic acoustic transducers [EMAT]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0234—Metals, e.g. steel
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Abstract
This application discloses a kind of electromagnetic acoustic phased array detection systems, including on-site programmable gate array FPGA, high-voltage pulse excitation module, ADC analog-digital converter, eight array element ultrasonic sensors and signal acquisition display module, wherein, FPGA generates high pressure activation signal and excitation timing for exporting control signal, to control high-voltage pulse excitation module；ADC analog-digital converter, for high pressure activation signal to be converted to excitation analog signal；Eight array element ultrasonic sensors, for generating ultrasonic wave, and the echo of reception sample under excitation analog signal and excitation timing effect；Signal acquisition display module for acquiring the eight received echoes of array element ultrasonic sensor, and shows the testing result of the sample generated according to echo.The detection system integrates electromagnetic acoustic and ultrasound phase-control technology, realizes focusing and deflection to ultrasonic acoustic beam, realizes the accurate excitation and reception of ultrasonic signal, greatly improves detection resolution.
Description
Technical field
This application involves metal material technical field of nondestructive testing more particularly to a kind of electromagnetic acoustic phased array detection systems
System.
Background technique
Ultrasonic detecting technology because of high sensitivity, detection range is wide, strong antijamming capability, defect location are accurate, detection speed
Fastly, the features such as harmless, has obtained the extensive use of industry spot.With the fast development of informationization technology, ultrasonic phase
Control battle array realizes the characteristics such as high speed, comprehensive, multi-angle and dynamic focusing, becomes in ultrasound field grinding for an emerging development
Study carefully hot spot.
Conventional ultrasonic phase array detection technique is divided into piezoelectric supersonic phased array and electromagnetic acoustic phased array, piezoelectric supersonic phase
It is high to control battle array detection sensitivity, but needs couplant, some detection materials can be polluted and is limited by environment temperature；And it is electric
Magnetic ultrasonic phase array detection technique is non-contact, the popular method of non-destructive testing technology has been become without the characteristic of couplant,
And electromagnetic acoustic can longitudinal wave, shear wave, Lamb wave etc. at excitation simultaneously, different lack may be implemented using different types of ultrasonic wave
Sunken detection.
But both at home and abroad to the research of electromagnetic acoustic phased-array technique mostly be using Lamb wave to System of Detecting Surface Defects For Material into
Row flaw detection research, it is less for the research detected using shear wave and longitudinal wave to material internal defect, cause tiny flaw signal-to-noise ratio
The problem of low, detection angles are single and lack of resolution.
Summary of the invention
This application provides a kind of electromagnetic acoustic phased array detection systems, are deposited with solving current electromagnetic acoustic phased-array technique
Tiny flaw signal-to-noise ratio is low, detection angles unit and the problem of lack of resolution.
In order to solve the above-mentioned technical problem, the embodiment of the present application discloses following technical solution:
In a first aspect, the embodiment of the present application discloses a kind of electromagnetic acoustic phased array detection system, including field-programmable
Gate array FPGA, high-voltage pulse excitation module, ADC analog-digital converter, eight array element ultrasonic sensors and signal acquisition display module,
Wherein,
The on-site programmable gate array FPGA, for exporting control signal, to control the generation of high-voltage pulse excitation module
High pressure activation signal and excitation timing；
The ADC analog-digital converter, the high pressure activation signal for exporting the high-voltage pulse excitation module are converted to
Motivate analog signal；
The eight array element ultrasonic sensor is super for generating under the excitation analog signal and excitation timing effect
Sound wave, and receive the echo of sample；
The signal acquisition display module for acquiring the received echo of eight array element ultrasonic sensor, and shows root
According to the testing result for the sample that the echo generates.
Optionally, the high-voltage pulse excitation module includes controller, excitation module and boost module, wherein
The controller, is used for emissioning controling signal, and the control signal is square-wave signal and pulse excitation；
The excitation module, for receiving the pulse excitation, and when by isolator by the excitation of the pulse excitation
Sequence is isolated with high pressure activation；
The boost module, for receiving and improving the voltage of the square-wave signal.
Optionally, the eight array element ultrasonic sensor includes outer protective shell and the preceding storing that is arranged in the outer protective shell
Big device, magnet, multiple array elements and carbonyl iron dust, wherein
The excitation analog signal that the preamplifier is used to export the ADC analog-digital converter amplifies；
Multiple array elements are set between the magnet and the carbonyl iron dust, and the magnet is close to the preposition amplification
Device.
Optionally, magnet fixed frame and card slot, the preamplifier and the magnet point are equipped in the outer protective shell
It is not fixed on the magnet fixed frame, the array element and the carbonyl iron dust are individually fixed in the card slot.
Optionally, the array element includes PCB detection coil, and the PCB detection coil is dish shaped coil.
It optionally, further include time delay exciting circuit, the input terminal of the time delay exciting circuit and the output end of the FPGA
Connection, the output end of the time delay exciting circuit are connect with multiple array elements respectively.
Optionally, the ADC analog-digital converter includes:
Analog to digital conversion circuit for the high pressure activation signal to be converted to excitation analog signal, and the echo is turned
It is changed to echo digital signal；
Circuit is received, is transmitted to the FPGA for receiving the echo digital signal, and by the echo digital signal.
Optionally, the signal acquisition display module includes:
Signal acquisition module is arranged between the ADC analog-digital converter and the FPGA, for acquiring the reception electricity
The echo digital signal on road；
Display module is connect with the FPGA, the inspection generated for showing the FPGA according to the echo digital signal
Survey result.
Optionally, the signal acquisition module includes filter, for filtering to the echo digital signal of acquisition
Wave processing.
Optionally, the filter is by the frequency filtering of the echo digital signal to 0.5-2MHz.
Compared with prior art, the application has the beneficial effect that
Electromagnetic acoustic phased array detection system provided by the embodiments of the present application includes on-site programmable gate array FPGA, high pressure
Pulse excitation module, ADC analog-digital converter, eight array element ultrasonic sensors and signal acquisition display module, wherein FPGA is for defeated
Control signal out, with control high-voltage pulse excitation module generate high pressure activation signal and excitation timing, high pressure activation signal and swash
Encouraging timing motivates eight array element ultrasonic sensors to generate ultrasonic wave, and ultrasonic wave detects sample, and receives the echo of sample, letter
Number acquisition display module generates the testing result of sample according to echo.The detection system collect electromagnetic acoustic and ultrasound phase-control technology in
All over the body, non-contact, eight array element ultrasonic sensors of sampling realize the superposition of signal, so that signal-to-noise ratio enhances, resolution ratio is improved；Eight gusts
The design of member is motivated the focus deflection of the ultrasonic acoustic beam of control realization of timing, so that the Signal-to-Noise obtained doubles
More than, realize ultrasonic signal it is accurate excitation and reception, greatly improve detection resolution, can be used for some angles it is different lack
It falls into the detection in direction and improves detection sensitivity, so that some smaller defects can also be detected, so that electromagnetic acoustic
Phased-array technique functionization, feasible robustness, the development for electromagnetic acoustic phased array provide technical support.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The application can be limited.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is a kind of structural block diagram of electromagnetic acoustic phased array detection system provided by the embodiments of the present application；
Fig. 2 is the structure of electromagnetic acoustic phased array detection system mesohigh pulse excitation module provided by the embodiments of the present application
Block diagram；
Fig. 3 is the knot of eight array element phased-array transducers in electromagnetic acoustic phased array detection system provided by the embodiments of the present application
Structure schematic diagram；
Fig. 4 is the structural schematic diagram of dish shaped coil in electromagnetic acoustic phased array detection system provided by the embodiments of the present application；
Fig. 5 is eight array element phased-array transducer time delays in electromagnetic acoustic phased array detection system provided by the embodiments of the present application
Control schematic diagram；
Fig. 6 is array element impulse time delay schematic diagram in electromagnetic acoustic phased array detection system provided by the embodiments of the present application；
Fig. 7 is eight array element phased-array transducers and examination in electromagnetic acoustic phased array detection system provided by the embodiments of the present application
The detection schematic diagram of sample；
Fig. 8 is eight array element phased-array transducer signals in electromagnetic acoustic phased array detection system provided by the embodiments of the present application
Receive schematic diagram.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the common skill in this field
The application protection all should belong in art personnel every other embodiment obtained without making creative work
Range.
It is the structural block diagram of electromagnetic acoustic phased array detection system provided by the embodiments of the present application referring to Fig. 1.
As shown in Figure 1, electromagnetic acoustic phased array detection system provided by the embodiments of the present application includes field-programmable gate array
Arrange FPGA100, high-voltage pulse excitation module 200, ADC analog-digital converter 300, eight array element ultrasonic sensors 400 and signal acquisition
Display module, wherein
FPGA100 generates high pressure activation signal and swashs for exporting control signal to control high-voltage pulse excitation module 200
Encourage timing.That is, FPGA100 can control the timing of high-voltage pulse excitation module 200, minimum can reach 2ns.
High-voltage pulse excitation module 200 generates high pressure activation signal and excitation under the control signal function of FPGA output
Timing.As shown in Fig. 2, high-voltage pulse excitation module 200 includes controller 201, excitation module 202 and boost module 203, control
Device 201 is used for emissioning controling signal, and signal can be square-wave signal and pulse sequence；Excitation module 202 receives controller 201 and emits
Pulse excitation, be the pulse sequence of 500ns, pulse excitation includes excitation timing and high pressure activation, can be by isolator by two
Person is isolated, and facilitates subsequent processing；Boost module 203 receives the 10ms square-wave signal that controller 201 emits, by the electricity of 12V
Pressure is increased to 300V, which is increased to 3000V by high-tension transformer rear shell, greatly increases the voltage of high pressure activation.
High-voltage pulse excitation module 200 is powered using 12V linear power supply, using three-level enlarged structure, three-level amplification
Multiple is respectively 70 times, 4 times and 4 times, and high-voltage pulse width and timing are controlled by FPGA100.When FPGA100 is by control pulse
Sequence and pulsed width actuation high-voltage signal, high-voltage signal amplify by three-level, generate alternating current in eight array elements.
ADC analog-digital converter 300, the high pressure activation signal for exporting high-voltage pulse excitation module are converted to excited modes
Quasi- signal.The resolution ratio of ADC analog-digital converter 300 is 16bit, for realizing the transformation of analog signal and digital signal, high pressure
Pumping signal is converted to excitation analog signal after ADC analog-digital converter 300, conveniently acts on eight array element ultrasonic sensors
On 400.
Eight array element ultrasonic sensors 400 are used to generate ultrasonic wave under excitation analog signal and excitation timing effect, and connect
Receive the echo of sample.As shown in figure 3, before eight array element ultrasonic sensors 400 include outer protective shell and are arranged in outer protective shell
Set amplifier 401, magnet 402, multiple array elements 403 and carbonyl iron dust 404, outer protective shell be used to encapsulate inside circuit devcie,
Magnet, conducting wire etc..In this example, magnet fixed frame and card slot are equipped in outer protective shell, preamplifier 401 divides with magnet 402
It is not fixed on magnet fixed frame, array element 403 and carbonyl iron dust 404 are individually fixed in card slot.
Preamplifier 401 is placed in the lateral side of magnet 402, the excited modes for exporting to ADC analog-digital converter 300
Quasi- signal amplifies, and 100 times of amplification can be achieved in maximum.
Magnet 402 is rectangle magnet, and the design of rectangle magnet can guarantee the magnetic induction of the dish shaped coil of everywhere
Intensity is identical.In this example, magnet 402 is permanent magnet, by two pieces of 150*30*40mm3Permanent magnet be composed, can have
Effect enhancing magnetic induction intensity, the ultrasonic signal that the increase excitation of maximum possible generates.
Multiple array elements 403 are set between magnet 402 and carbonyl iron dust 404, and signal function is simulated in excitation after amplification
Lower generation ultrasonic wave, and eight array elements 403 can achieve the purpose that ultrasonic beam focus deflection under the action of motivating timing.Each
Array element 403 all includes independent PCB detection coil, in this example, as shown in figure 4, PCB detection coil is butterfly shaped coils, eight
Dish shaped coil shares one block of magnet 402, and butterfly structure is to remove electromagnetic noise caused by circuit in coil.
Traditional coil is using rectangular-ambulatory-plane coil design, and the coil of the application design is to be spliced to two back-shaped coils
Together, a butterfly shaped coils are formed, effective contact area is increased.This coil design approaches can effectively inhibit common-mode noise,
Signal-to-noise ratio is improved, the receiving efficiency and detection sensitivity of signal are improved.In order to make coil received signal be more likely to mostly input
To in preamplifier, need to consider the resistance matching problem of coil and preamplifier.Linear diameter and line spacing in coil
Also signal strength can be had an impact, also problem in need of consideration.
Carbonyl iron dust 404 is that magnetic conduction is non-conductive, passes through magnetic field and electric current is prevented to pass through, farthest to eliminate
Electrical noise weakens the self-priming effect that butterfly shaped coils incude current vortex generation in magnet 402, reaches optimal signal-to-noise ratio.
Butterfly shaped coils have certain size, and eight array element ultrasonic sensors, 400 coil can occupy very big volume,
It is secondary, also to guarantee that sensor can motivate the ultrasonic wave of suitable sufficient intensity on sample 700, also to guarantee sensor energy
The echo of ultrasonic wave is enough received, is to obtain high s/n ratio, Gao Ling to the design effectively of eight array element ultrasonic sensors 400 therefore
The key of sensitivity sound beam focusing, defection signal.
If the timing in butterfly shaped coils in eight array element ultrasonic sensors 400 has phase delay, the ultrasound generated can be made
The wave field of wave has certain focusing or deflection, to achieve the effect that improve signal strength and scanning.Conversely, when ultrasonic wave is propagated
Current vortex, current vortex meeting can be generated in the active force in magnetic field due to the vibration of particle to eight array element ultrasonic sensor search coverages
Alternating magnetic field is induced, therefore alternating current can be induced in dish shaped coil, in this example, eight array element ultrasonic sensors 400
In pulse sequence accurate control can be realized by FPGA100.
Specifically, electromagnetic acoustic phased array detection system provided by the embodiments of the present application further includes time delay exciting circuit,
FPGA100 controls the excitation of different array elements by time delay exciting circuit, when different array elements have different according to array element spacing
Prolong.As shown in figure 5, the input terminal of time delay exciting circuit and the output end of FPGA100 connect, for what is exported according to FPGA100
Motivate the work of timing control time delay exciting circuit；The output end of time delay exciting circuit is connect with multiple array elements 403 respectively, is used for
The sequential time delay for controlling array element 403, achievees the purpose that ultrasound beamformer focus deflection, plays the effect for improving signal-to-noise ratio, sensitivity
Fruit can also increase scanning detection range, the different defect of discovery angle.
As shown in fig. 6, the excitation of a sine wave signal generally requires two rectangular pulses to complete, two pulses pass through
Control sequential has just obtained excitation sinusoidal signal.Accurately time delay is obtained between different array elements according to interval calculation between array element,
The transmitting that pulse sequence is controlled by FPGA100 achievees the purpose that different array elements etc. (same) phase (mutually long superposition) focuses, with
Play the strongest function and effect of interference.
As shown in fig. 7, the ultrasonic wave that multiple array elements 403 generate travels in the search coverage of sample 700, sample will cause
The oscillation of metal material electronics on 700 can generate induced electricity in dish shaped coil in the closed circuit again under magnetic fields
Stream, can be according to the ultrasound information in the induced current display material, to realize the ultrasound detection to sample 700.
Dish shaped coil in multiple array elements 403 induces induced current, sensor current signal by preamplifier 401 into
Row amplification, output is amplified induced current analog signal, carries out subsequent processing for convenience of to induced current analog signal,
Induced current analog signal is converted into induced current digital signal by ADC analog-digital converter 300, passes through signal acquisition later
Display module is acquired induced current digital signal, handles and display.
As shown in figure 8, ADC analog-digital converter 300 includes analog to digital conversion circuit and receives circuit, analog to digital conversion circuit is used for
The high pressure activation signal that high-voltage pulse excitation module 200 exports is converted into excitation analog signal, to motivate eight array element ultrasounds to pass
Sensor 400 generates ultrasonic wave, meanwhile, the received analogue echoes signal of each array element 403 is respectively converted into echo digital signal.
The echo digital signal that circuit is used to receive each road is received, and echo digital signal is transmitted to FPGA100, passes through FPGA100
Echo digital signal is handled.
For convenience of echo digital signal is transmitted to FPGA100, signal acquisition display module includes signal acquisition module 500
With display module 600, signal acquisition module 500 is arranged between ADC analog-digital converter 300 and FPGA100, receives for acquiring
The echo digital signal of circuit.The appearance of electrical noise is usually associated in echo digital signal, therefore, signal acquisition module 500
Including filter, for being filtered to the echo digital signal of acquisition, the ultrasonic frequency in metal material can be filtered
Wave is to 0.5-2MHz.
In this example, signal acquisition module 500 uses SDLaser-DAQ600 (hereinafter referred to as DAQ600), and DAQ600 is one
Money specialized high-speed signal data acquisition system, using " ARM+FPGA+ADC " framework, supporting industry on-site data gathering, state prison
The functions such as survey, which is designed using eight laminate technical grades, using independent binary channels, 16bit high-performance production by assembly line
Data acquisition is carried out, support number I/O such as extend, is locally displayed, storing, reviewing at the functions, support real-time online to acquire, handle,
Upload data, wherein network uploading speed can achieve 100Mbps, can be with real-time perfoming waveform using host computer interactive software
Display.
Display module 600 is connect with FPGA100, the testing result generated for showing FPGA according to echo digital signal.
In the echo digital signal input FPGA100 collected, FPGA100 is overlapped signal, then right by display module 600
Data carry out storage and real-time display.The section of the system that display module 600 may be based on LabView, the system can be set
The various information of display are set, data transmission can also be transmitted by network interface by WiFi.
The specific testing process of electromagnetic acoustic phased array detection system provided by the embodiments of the present application is as follows:
1. high pressure activation module is powered using 12V linear power supply, using three-level enlarged structure, three-level amplification factor point
Wei not be 70 times, 4 times and 4 times, high-voltage pulse width and timing are controlled by FPGA.FPGA passes through control pulse sequence and pulsed width actuation
High-voltage signal, high-voltage signal amplify by three-level, and alternating current is generated in butterfly shaped coils.
2. the butterfly shaped coils in eight array element sensors produce alternating current under the excitation of high pressure, on electric conductor surface
Have alternating electric field in vain, magnetic field strength can penetrate into electric conductor, and due to skin effect, the depth of penetration can weaken, and become skin table in conductor
Face can generate corresponding current vortex, and the movement of electronics will receive the effect of Lorentz force under Action of Static Magnetic Field in conductor, this
The power of kind alternation directly acts on electronics, and electronics can collide again with lattice emission, make the surface layer stress of electric conductor, and it is super to become transmitting
The sound source of sound.If the timing in butterfly shaped coils in eight array element sensors has phase delay, the wave of the ultrasonic wave generated can be made
There are certain focusing or deflection in field, to achieve the effect that improve signal strength and scanning.Conversely, when ultrasonic wave travels to eight times
First sensor detection areas can generate current vortex due to the vibration of particle under the influence of a magnetic field, and current vortex can induce alternation
Magnetic field, therefore alternating current can be induced in butterfly shaped coils.
3. the current signal amplitude for incuding generation is especially weak, but also along with the appearance of electrical noise, preamplifier and
The filter and amplification of analog signal, filtering bandwidth 0.5-2MHz may be implemented in filter circuit, and amplification factor is 0-141000 times, not
It is that amplification factor is the bigger the better, corresponding electrical noise is also reinforced.
4. the signal by preamplifier is analog signal, need at electric signal just to use analog-signal transitions here
It has arrived 16bit high-performance production by assembly line and has carried out data acquisition.
5. the eight tunnel sensor signals acquired will synthesize a branch of to achieve the effect that focus deflection, this need by add operation
Eight channel signals are wanted to acquire, each channel uses frequency 100MSPS, then data are overlapped operation by precision 16bit, FPGA
Data are stored and are shown by ARM.
Electromagnetic acoustic phased array detection system provided by the embodiments of the present application collects electromagnetic acoustic and ultrasound phase-control technology in one
Body, it is non-contact, the timing_delay estimation of driving pulse may be implemented to achieve the purpose that sound beam focusing deflects, can be used for some angles not
The detection and raising detection sensitivity in same defect direction, so that some smaller defects can also be detected, so that electric
The functionization of magnetic ultrasonic phased array technology, feasible robustness, the development for electromagnetic acoustic phased array provide technical support.It is set used in this method
It is standby simple and convenient, be easy to practical, measurement accuracy is high, favorable repeatability, facilitate electromagnetic acoustic phased array detection technique into
One step promotion and application have biggish economic benefit and social benefit.
Those skilled in the art will readily occur to its of the application after considering specification and practicing the disclosure invented here
His embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are wanted by right
The content asked is pointed out.
Above-described the application embodiment does not constitute the restriction to the application protection scope.
Claims (10)
1. a kind of electromagnetic acoustic phased array detection system, which is characterized in that including on-site programmable gate array FPGA, high-voltage pulse
Excitation module, ADC analog-digital converter, eight array element ultrasonic sensors and signal acquisition display module, wherein
The on-site programmable gate array FPGA generates high pressure for exporting control signal to control high-voltage pulse excitation module
Pumping signal and excitation timing；
The ADC analog-digital converter, the high pressure activation signal for exporting the high-voltage pulse excitation module are converted to excitation
Analog signal；
The eight array element ultrasonic sensor, for generating ultrasound under the excitation analog signal and excitation timing effect
Wave, and receive the echo of sample；
The signal acquisition display module for acquiring the received echo of eight array element ultrasonic sensor, and is shown according to institute
State the testing result of the sample of echo generation.
2. electromagnetic acoustic phased array detection system according to claim 1, which is characterized in that the high-voltage pulse excited modes
Block includes controller, excitation module and boost module, wherein
The controller, is used for emissioning controling signal, and the control signal is square-wave signal and pulse excitation；
The excitation module, for receiving the pulse excitation, and by isolator by the excitation timing of the pulse excitation with
High pressure activation isolation；
The boost module, for receiving and improving the voltage of the square-wave signal.
3. electromagnetic acoustic phased array detection system according to claim 1, which is characterized in that the eight array element ultrasonic sensing
Device includes outer protective shell and the preamplifier being arranged in the outer protective shell, magnet, multiple array elements and carbonyl iron dust,
In,
The excitation analog signal that the preamplifier is used to export the ADC analog-digital converter amplifies；
Multiple array elements are set between the magnet and the carbonyl iron dust, and the magnet is close to the preamplifier.
4. electromagnetic acoustic phased array detection system according to claim 3, which is characterized in that be equipped in the outer protective shell
Magnet fixed frame and card slot, the preamplifier and the magnet are individually fixed on the magnet fixed frame, the array element
It is individually fixed in the card slot with the carbonyl iron dust.
5. electromagnetic acoustic phased array detection system according to claim 4, which is characterized in that the array element includes PCB inspection
Test coil, the PCB detection coil are dish shaped coil.
6. electromagnetic acoustic phased array detection system according to claim 3, which is characterized in that further include time delay excitation electricity
The input terminal on road, the time delay exciting circuit is connect with the output end of the FPGA, the output end point of the time delay exciting circuit
It is not connect with multiple array elements.
7. electromagnetic acoustic phased array detection system according to claim 1, which is characterized in that the ADC analog-digital converter
Include:
Analog to digital conversion circuit for the high pressure activation signal to be converted to excitation analog signal, and the echo is converted to
Echo digital signal；
Circuit is received, is transmitted to the FPGA for receiving the echo digital signal, and by the echo digital signal.
8. electromagnetic acoustic phased array detection system according to claim 7, which is characterized in that the signal acquisition shows mould
Block includes:
Signal acquisition module is arranged between the ADC analog-digital converter and the FPGA, for acquiring the reception circuit
Echo digital signal；
Display module is connect with the FPGA, the detection knot generated for showing the FPGA according to the echo digital signal
Fruit.
9. electromagnetic acoustic phased array detection system according to claim 8, which is characterized in that the signal acquisition module packet
Filter is included, for being filtered to the echo digital signal of acquisition.
10. electromagnetic acoustic phased array detection system according to claim 9, which is characterized in that the filter will be described
The frequency filtering of echo digital signal is to 0.5-2MHz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114216600A (en) * | 2021-12-15 | 2022-03-22 | 北京工业大学 | L based on double-folding coil electromagnetic acoustic sensorCRWave sound beam deflection regulating and controlling method |
| CN115014587A (en) * | 2022-05-30 | 2022-09-06 | 西安工程大学 | Magnetic effect phased array signal acquisition structure, system and method |
| CN116106425A (en) * | 2022-12-30 | 2023-05-12 | 天津市滨海新区检验检测中心 | Magnetic nondestructive testing system based on ultrasonic phased array technology |
| CN117554493A (en) * | 2024-01-11 | 2024-02-13 | 中国特种设备检测研究院 | Method, equipment and medium for detecting near-surface defects of metal material |
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