CN207067061U - Eddy current array detection means based on compressed sensing, eddy current array probe - Google Patents
Eddy current array detection means based on compressed sensing, eddy current array probe Download PDFInfo
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- CN207067061U CN207067061U CN201720685004.7U CN201720685004U CN207067061U CN 207067061 U CN207067061 U CN 207067061U CN 201720685004 U CN201720685004 U CN 201720685004U CN 207067061 U CN207067061 U CN 207067061U
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- 239000000523 sample Substances 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 230000005284 excitation Effects 0.000 claims abstract description 43
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000009434 installation Methods 0.000 claims abstract description 8
- 238000005086 pumping Methods 0.000 claims description 9
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims 3
- 238000005070 sampling Methods 0.000 abstract description 17
- 230000005540 biological transmission Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000001413 cellular effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Abstract
A kind of eddy current array detection means based on compressed sensing, eddy current array probe are the utility model is related to, detection means includes excitation signal generator, power amplifier, eddy current array probe, signal acquisition module, FPGA controller and PC host computers；Eddy current array probe is made up of eddy current probe unit, and vortex is visited unit header and is made up of probing shell, termination, bottom, installation nut, excitation coil, coil rack, iron core, TMR magnetic field sensors, printed circuit board (PCB).The utility model is openness using eddy current array signal itself, while signal reconstruction precision is ensured, significantly reduce signal sampling frequencies, thus reduce the requirement to hardware modules such as sample circuits, reduce sampled data output, be advantageous to mitigate data acquisition, transmission, the hardware burden of storage, extend service life of equipment.For being powered by finite energy resource and using the portable set of array probe, a large amount of sampling energy consumptions can be saved and calculate energy consumption, significantly lengthened working hours.
Description
Technical field
A kind of eddy current array detection means based on compressed sensing of the utility model, eddy current array probe, belong to lossless inspection
Survey technology field.
Background technology
When conventional vortex detection means is scanned using array probe at present, in order to obtain distortionless signal, signal sampling
Shannon-Nyquist (Shannon-Nyquist) sampling thheorem is must comply with, sampling rate should be not less than original signal highest frequency
2 times, even more high.Such high-frequency data acquisition mode, adds hardware circuit load, volume of transmitted data and amount of storage,
Data transfer delay height, service life of equipment can be caused to shorten.Therefore it is highly desirable to design a kind of novel detection device, can be
Signals revivification precision is still can guarantee that under relatively low sample frequency, to reduce the live load of eddy current array detection means.
The content of the invention
The utility model provides a kind of eddy current array detection means based on compressed sensing, while provides based on compression sense
Eddy current array probe in the eddy current array detection means known, for overcoming conventional vortex detection means to be swept using array probe
When retouching, in order to obtain distortionless signal, it is necessary to which, with high sample frequency gathered data, volume of transmitted data is big, hardware circuit load
The problem of high.
The technical solution of the utility model is：A kind of eddy current array detection means based on compressed sensing, including excitation letter
Number generator, power amplifier, eddy current array probe, signal acquisition module, FPGA controller and PC host computers；
The FPGA controller is adopted with excitation signal generator, signal respectively by gpib bus, I/O port, RS232 buses
Collection module is connected with PC host computers；PC host computers send instructions to FPGA controller, FPGA controller root by RS232 buses
According to the instruction received, excitation signal generator is controlled to produce pulse excitation signal by gpib bus；FPGA controller passes through
I/O port sends random m pseudo-orders to signal acquisition module；The excitation signal generator output end and power amplifier input
Connection, power amplifier output are connected with the excitation coil 5 of each eddy current probe unit 10 in eddy current array probe, pumping signal
Generator produces periodically pulsing pumping signal under FPGA controller control, and signal drives after power amplifier amplifies to swash
Encourage coil and produce excitation field；The output end of TMR magnetic field sensors 8 of each eddy current probe unit 10 of eddy current array probe respectively with
Signal acquisition module input is connected；Signal acquisition module output end is connected with PC host computers.
The FPGA controller sends random m pseudo-orders to data collecting card by I/O port；
The signal sampling module includes low pass filter, voltage amplifier, data collecting card；Wherein eddy current array probe
In the output end of TMR magnetic field sensors 8 be connected with low pass filter input, the output end and voltage amplifier of low pass filter
Input be connected, the output end of voltage amplifier is connected with the input of data collecting card, the output end of data collecting card with
PC host computers connect.
A kind of eddy current array probe in eddy current array detection means realized based on compressed sensing, the eddy current array are visited
Head is by 1 or multiple identical eddy current probe units 10 form, and each vortex visits unit header 10 by probing shell 1, end
First 2, bottom 3, installation nut 4, excitation coil 5, coil rack 6, iron core 7, TMR magnetic field sensors 8 and the structure of printed circuit board (PCB) 9
Into；Wherein cylindrical excitation coil 5 is around in the outside of coil rack 6, and iron core 7 is located in coil rack 6, TMR magnetic field sensors 8
It is welded on printed circuit board (PCB) 9, printed circuit board (PCB) 9 is located at the top of coil rack 6, and the wiring of TMR magnetic field sensors 8 is by printing electricity
Road plate 6 is drawn, and the perforate of termination 2 from the top of probing shell 1 passes, bottom 3 by cylindrical excitation coil 5, coil rack 6,
Iron core 7, the axial compression of TMR magnetic field sensors 8 are encapsulated in probing shell 1, and the installation nut 4 being fixed on outside probing shell 1 is used
In fastening template mounting bracket 11.
The beneficial effects of the utility model are：The utility model is openness using eddy current array signal itself, is ensureing
While signal reconstruction precision, signal sampling frequencies are significantly reduced, are thereby dramatically reduced to hardware modules such as sample circuits
Requirement, reduce sampled data output, be advantageous to mitigate data acquisition, transmission, storage hardware burden, extend equipment use
Life-span.For being powered by finite energy resource and for portable set using array probe, can save a large amount of sampling energy consumptions and
Energy consumption is calculated, is significantly lengthened working hours.
Brief description of the drawings
Fig. 1 is the utility model eddy current array structure of the detecting device block diagram；
Fig. 2 is the utility model eddy current probe cellular construction schematic perspective view；
Fig. 3 is the utility model eddy current probe cellular construction schematic cross-sectional view；
Fig. 4 is the utility model eddy current probe cellular construction schematic top plan view；
Fig. 5 is that eddy current probe unit installs fixed form schematic diagram；
Fig. 6 is eddy current array probe structural representation；
Each label in figure：1- probing shells, 2- terminations, 3- bottoms, 4- installation nut, 5- excitation coils, 6- coil racks,
7- iron cores, 8-TMR magnetic field sensors, 9- printed circuit board (PCB)s, 10- eddy current probe units, 11- template mounting brackets.
Embodiment
With reference to the accompanying drawings and examples, the utility model is described in further detail, but content of the present utility model is not
It is limited to the scope.
Embodiment 1：As shown in figures 1 to 6, a kind of eddy current array detection means based on compressed sensing, including pumping signal hair
Raw device, power amplifier, eddy current array probe, signal acquisition module, FPGA controller and PC host computers；
The FPGA controller is adopted with excitation signal generator, signal respectively by gpib bus, I/O port, RS232 buses
Collection module is connected with PC host computers；PC host computers send instructions to FPGA controller, FPGA controller root by RS232 buses
According to the instruction received, excitation signal generator is controlled to produce pulse excitation signal by gpib bus；FPGA controller passes through
I/O port sends random m pseudo-orders to signal acquisition module；The excitation signal generator output end and power amplifier input
Connection, power amplifier output are connected with the excitation coil 5 of each eddy current probe unit 10 in eddy current array probe, pumping signal
Generator produces periodically pulsing pumping signal under FPGA controller control, and signal drives after power amplifier amplifies to swash
Encourage coil and produce excitation field；The output end of TMR magnetic field sensors 8 of each eddy current probe unit 10 of eddy current array probe respectively with
Signal acquisition module input is connected；Signal acquisition module output end is connected with PC host computers.
The FPGA controller can send random m pseudo-orders to data collecting card by I/O port；
The signal sampling module can be：Including low pass filter, voltage amplifier, data collecting card；Wherein it is vortexed
The output end of TMR magnetic field sensors 8 in array probe is connected with low pass filter input, output end and the electricity of low pass filter
The input of pressure amplifier is connected, and the output end of voltage amplifier is connected with the input of data collecting card, data collecting card
Output end is connected with PC host computers.
A kind of eddy current array probe in eddy current array detection means realized based on compressed sensing, the eddy current array are visited
Head can be：Being made up of 8 identical eddy current probe units 10 (according to being actually needed, can increase or decrease contact unit
Quantity；Eddy current array probe is scanned according to direction shown in Fig. 6, and detection efficiency substantially improves a lot compared with single probe), each
Vortex visits unit header 10 by probing shell 1, termination 2, bottom 3, installation nut 4, excitation coil 5, coil rack 6, iron core 7, TMR
Magnetic field sensor 8 and printed circuit board (PCB) 9 are formed；Wherein cylindrical excitation coil 5 is around in the outside of coil rack 6, and iron core 7 is located at
In coil rack 6, TMR magnetic field sensors 8 are welded on printed circuit board (PCB) 9, and printed circuit board (PCB) 9 is located at the top of coil rack 6,
The wiring of TMR magnetic field sensors 8 is drawn by printed circuit board (PCB) 6, and the perforate of termination 2 from the top of probing shell 1 passes, bottom 3
Cylindrical excitation coil 5, coil rack 6, iron core 7, the axial compression of TMR magnetic field sensors 8 are encapsulated in probing shell 1, Gu
The installation nut 4 being scheduled on outside probing shell 1 is used to fasten template mounting bracket 11.
The present invention use process be：
S1, signal pre-sampling：Pumping signal parameter is set on PC host computers, by RS232 buses by parameter and instruction
Send to FPGA controller；After FPGA controller receives parameter and instruction, excitation signal generator is controlled by gpib bus
Periodically pulsing pumping signal is produced, signal drives the excitation coil 5 in eddy current array probe after power amplifier amplifies
Excitation field is produced, excitation field acts on detection test specimen, and all TMR magnetic field sensors 8 are correspondingly examined in eddy current array probe
Measure the change of test specimen Induced magnetic field, and output voltage signal is as original pulse eddy current array signal X (t), by low pass filtered
Ripple device is filtered with after voltage amplifier amplification, and the signal gathered by data collecting card is discrete signal x；FPGA controller simultaneously
Random m pseudo-orders are produced, and are gathered by data collecting card；The data gathered by data collecting card deliver to upper PC host computers；
Wherein, low pass filter selects second order Butterworth LPF, transmission function H1(s), voltage amplifier is using fixation
Gain is amplified, multiplication factor G；
S2, the rarefaction representation for seeking discrete signal x：Choose Fourier transform matrix and be used as sparse basis array Ψ, so that will be from
Scattered signal x rarefaction representations are：X=Ψ c；Wherein, c is sparse coefficient, Ψ=[ψ1|ψ2|…ψN], x is the original pulse whirlpool of collection
Array signal X (t) discrete signal is flowed, N is original pulse eddy current array signal X (t) length；
S3, seek sparse sampling frequency：Sparse sampling frequency is the 2M/ of original pulse eddy current array signal X (t) highest frequencies
N times；Wherein, M=Kln (N/M), K are discrete signal x degree of rarefication；
S4, seek sensing matrix：According to H1(s), G obtains observation process transmission function and is：H (s)=H1(s)G；To H's (s)
Unit impulse response carries out sliding-model control, and discrete frequency is equal with the clock frequency of m pseudo-orders, and from sliding-model control result
In take before (M × N)/2 values form sequences h (n1), 1+ (M × N)/2 before being taken out from the m pseudo-order values of FPGA controller generation
Individual value, form sequence P (n2), according to h (n1) and P (n2) seek convolutionObtain observing square
Battle arrayFinally give sensing matrix Θ=Φ Ψ；Wherein, n1=0,1 ..., -1+ (M ×
N)/2, n2=0,1 ..., (M × N)/2, n3=0,1 ..., M × N-1, L=M × N-N；
S5, sparse sampling：Using the sparse sampling frequency obtained in step S3, by data collecting card to by low pass filtered
Ripple device filters carries out sparse sampling with the original pulse eddy current array signal X (t) after voltage amplifier amplification, obtains observation y
And deliver to PC host computers；Y=Φ x=Φ Ψ c=Θ c；
S6, in PC host computers according to observation y and sensing matrix Θ, using complementary space matching pursuit algorithm to observation
Y carries out the reconstruct of primary signal, so as to obtain final eddy current array detection signal, and shows and stores；
S7, detection are completed, then stop excitation and sampling, and otherwise return to step S5 carries out sampling next time.
Wherein, data acquisition card can use NI PCIe-6343 data collecting cards, include 32 road analog inputs and 4
Road analog output, data are exchanged with PC host computers by PCI Express buses.Inside and outside circle radius of excitation coil 5 etc. is joined
Number and the parameter of TMR magnetic field sensors 8 can be as shown in table 1：
Table 1
| The number of turn (excitation coil winding turns) | 330 |
| The inner radii of excitation coil | 9.0mm |
| The outer radii of excitation coil | 12.5mm |
| Excitation coil winding height | 20.7mm |
| Coiling excitation coil copper wire diameter | 0.15mm |
| TMR magnetic field sensor sizes | Long 5mm × wide 5mm × high 2.5mm |
Specific embodiment of the present utility model is explained in detail above in conjunction with accompanying drawing, but the utility model is not
It is limited to above-mentioned embodiment, in those of ordinary skill in the art's possessed knowledge, this practicality can also be not being departed from
Various changes can be made on the premise of new objective.
Claims (3)
- A kind of 1. eddy current array detection means based on compressed sensing, it is characterised in that：Put including excitation signal generator, power Big device, eddy current array probe, signal acquisition module, FPGA controller and PC host computers；The FPGA controller by gpib bus, I/O port, RS232 buses respectively with excitation signal generator, signal acquisition mould Block is connected with PC host computers；PC host computers send instructions to FPGA controller by RS232 buses, and FPGA controller is according to connecing The instruction received, excitation signal generator is controlled to produce pulse excitation signal by gpib bus；FPGA controller passes through I/O port Random m pseudo-orders are sent to signal acquisition module；The excitation signal generator output end is connected with power amplifier input, Power amplifier output and each eddy current probe unit in eddy current array probe（10）Excitation coil（5）It is connected, pumping signal Generator produces periodically pulsing pumping signal under FPGA controller control, and signal drives after power amplifier amplifies to swash Encourage coil and produce excitation field；The each eddy current probe unit of eddy current array probe（10）TMR magnetic field sensors（8）Output end point It is not connected with signal acquisition module input；Signal acquisition module output end is connected with PC host computers.
- 2. the eddy current array detection means according to claim 1 based on compressed sensing, it is characterised in that：The FPGA controller sends random m pseudo-orders to data collecting card by I/O port；The signal acquisition module includes low pass filter, voltage amplifier, data collecting card；Wherein in eddy current array probe TMR magnetic field sensors（8）Output end is connected with low pass filter input, the output end of low pass filter and voltage amplifier Input is connected, and the output end of voltage amplifier is connected with the input of data collecting card, the output end and PC of data collecting card Host computer connects.
- 3. realizing the eddy current array probe in the eddy current array detection means based on compressed sensing described in claim 1, it is special Sign is：The eddy current array probe is by eddy current probe unit（10）Composition, each eddy current probe unit（10）By probing shell （1）, termination（2）, bottom（3）, installation nut（4）, excitation coil（5）, coil rack（6）, iron core（7）, TMR magnetic field sensors （8）And printed circuit board (PCB)（9）Form；Wherein excitation coil（5）It is around in coil rack（6）Outside, iron core（7）Positioned at coil rack （6）It is interior, TMR magnetic field sensors（8）It is welded on printed circuit board (PCB)（9）On, printed circuit board (PCB)（9）Positioned at coil rack（6）Top, TMR magnetic field sensors（8）Wiring by printed circuit board (PCB)（9）Draw, and from probing shell（1）The termination on top（2）Perforate is worn Go out, bottom（3）By excitation coil（5）, coil rack（6）, iron core（7）, TMR magnetic field sensors（8）Axial compression is encapsulated in spy Head shell（1）It is interior, it is fixed on probing shell（1）Outer installation nut（4）For fastening template mounting bracket（11）.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167517A (en) * | 2017-06-09 | 2017-09-15 | 昆明理工大学 | Eddy current array detection means, its detection method and eddy current array probe based on compressed sensing |
| CN109632947A (en) * | 2019-01-29 | 2019-04-16 | 中国特种设备检测研究院 | Pulse eddy current detection method, device and storage medium based on transmission function |
| CN112162036A (en) * | 2020-09-16 | 2021-01-01 | 昆明理工大学 | Health monitoring system and method for regular triangle phased array bolt fastening structure |
| WO2024040898A1 (en) * | 2022-08-22 | 2024-02-29 | 华能(福建漳州)能源有限责任公司 | Labview-based teaching aid device for magnetic flux leakage detection |
-
2017
- 2017-06-09 CN CN201720685004.7U patent/CN207067061U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107167517A (en) * | 2017-06-09 | 2017-09-15 | 昆明理工大学 | Eddy current array detection means, its detection method and eddy current array probe based on compressed sensing |
| CN107167517B (en) * | 2017-06-09 | 2023-09-26 | 昆明理工大学 | Eddy current array detection device based on compressed sensing, detection method thereof and eddy current array probe |
| CN109632947A (en) * | 2019-01-29 | 2019-04-16 | 中国特种设备检测研究院 | Pulse eddy current detection method, device and storage medium based on transmission function |
| CN112162036A (en) * | 2020-09-16 | 2021-01-01 | 昆明理工大学 | Health monitoring system and method for regular triangle phased array bolt fastening structure |
| CN112162036B (en) * | 2020-09-16 | 2022-01-11 | 昆明理工大学 | Health monitoring system and method for regular triangle phased array bolt fastening structure |
| WO2024040898A1 (en) * | 2022-08-22 | 2024-02-29 | 华能(福建漳州)能源有限责任公司 | Labview-based teaching aid device for magnetic flux leakage detection |
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Granted publication date: 20180302 Termination date: 20190609 |