CN102661995A - Electromagnetic acoustic and magnetic leakage compounded detection method - Google Patents
Electromagnetic acoustic and magnetic leakage compounded detection method Download PDFInfo
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- CN102661995A CN102661995A CN2012101473588A CN201210147358A CN102661995A CN 102661995 A CN102661995 A CN 102661995A CN 2012101473588 A CN2012101473588 A CN 2012101473588A CN 201210147358 A CN201210147358 A CN 201210147358A CN 102661995 A CN102661995 A CN 102661995A
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Abstract
The invention discloses an electromagnetic acoustic and magnetic leakage compounded detection method and relates to a nondestructive detection method. The detection method comprises the following steps of: on the basis of a fundamental principle of magnetic leakage detection, increasing an EMAT (Electro Magnetic Acoustic Transducer) exciting coil capable of generating a dynamic alternating magnetic field and an EMAT detection coil for receiving ultrasonic echoes; when pulse current is excited in the EMAT exciting coil, generating electromagnetic ultrasonic waves propagated to the other side of a detected steel plate, wherein when the electromagnetic ultrasonic waves is encountered with the outer wall of the detected steel plate, acoustic echoes can be generated, and picking up the acoustic echoes by utilizing the EMAT detection coil; analyzing the pick-up acoustic echoes to obtain a position with a defect to realize the positioning of layers of an inner wall and the outer wall; and finally, forming a compound nondestructive detection effect by fusing defect form information provided by magnetic leakage detection signals so as to reconstruct an actual form and depth of the detect. According to the detection method, the defects of non-ideal evaluation effect and low accuracy to the defect of the prior art are effectively overcome, and the detection method has the advantages of simple structure and non-contact measurement.
Description
Technical field
The present invention relates to a kind of lossless detection method, especially relate to a kind of based on electromagnetic acoustic and the compound detection method of leakage field.
Background technology
Along with the widespread use that the leakage field method detects at steel plates such as storage tank, pipelines, more and more important to the location of depth of defect.On the one hand, help in the flaw detection report, the origin cause of formation of corrosion default accurately being described; On the other hand, along with the location of the inside and outside parietal layer of corrosion time (being the degree of depth), more can the exact evaluation detection signal, improve the quantified precision of testing result.Present widely used flux-leakage detection method owing to can all can produce similar stray field in tested steel plate both sides, therefore is difficult to the concrete degree of depth that corrosion takes place is assessed.And to the inside and outside wall differentiating method of Magnetic Flux Leakage Inspecting, the thinking that all adopts signal filtering to handle abroad realizes.But in fact; What cause the signal frequency changing features is not only the position of corrosion; The speed that detects and the geometric configuration of corrosion etc. also can be reflected on signal waveform and the frequency; Therefore the conventional thought effect of signal filtering processing is undesirable, and accuracy rate is paced up and down 50%, is difficult in practical engineering application, promote.
Chinese patent CN101354380A discloses a kind of eddy current, electromagnetic ultrasonic combined type nondestructive detection method; This method utilizes EDDY CURRENT sensitive for the defective on measurand surface and inferior surface; And than detection method of eddy, electromagnetic acoustic can detect thicker many materials.Combine through EDDY CURRENT and electromagnetic acoustic are detected, realized the mutual check of measurand testing result, also can compensate each other simultaneously, thereby realize detecting the measurand surface and the purpose of degree of depth defective more.But this method can only obtain the information that there are flawless information and the measurand surface and the following degree of depth thereof in the measurand surface, can't know the actual form information of defective.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned prior art, a kind of electromagnetic acoustic and leakage field compound detection device are provided.
Another object of the present invention is to provide a kind of electromagnetic acoustic and leakage field composite detection method
Said electromagnetic acoustic and leakage field compound detection device are provided with magnetic core, permanent magnet, EMAT excitation variable winding, EMAT magnetic test coil, Magnetic Flux Leakage Inspecting element; Said permanent magnet is fixed in the thinner end of magnetic core, EMAT excitation variable winding, EMAT magnetic test coil be fixed in permanent magnet under and steel plate to be measured top; Said Magnetic Flux Leakage Inspecting element is fixed in the centre at probe two ends and places steel plate to be measured top.
Said magnetic core can adopt L type magnetic core or U-shaped magnetic core etc.
Said electromagnetic acoustic and leakage field composite detection method adopt said electromagnetic acoustic and leakage field compound detection device, and said detection method may further comprise the steps:
1) electromagnetic acoustic and leakage field compound detection device are placed surface of steel plate to be measured; And steel plate to be measured is scanned detection by the lift-off value H1 that sets; Wherein, Permanent magnet, EMAT excitation variable winding, EMAT magnetic test coil and steel plate to be measured constitute electromagnet ultrasonic changer (Electromagnetic Acoustic Transducer is called for short EMAT), and electromagnet ultrasonic changer is a kind of hyperacoustic transducing head that in conductor, encourages and receive;
2) in the EMAT excitation variable winding, apply pumping signal, thereby form the electromagnetic ultrasonic wave perpendicular to surface of steel plate incident to be measured, electromagnetic acoustic wave direction steel plate opposite side to be measured is propagated; When running into steel plate outer wall to be measured; To produce ultrasonic echo, simultaneously, under the effect of permanent magnet; Steel plate to be measured to state of saturation, at this moment will be produced stray field at fault location by local magnetized;
3) pick up step 2 through the EMAT magnetic test coil) the middle ultrasonic echo that produces; Simultaneously; Utilize the Magnetic Flux Leakage Inspecting element with the lift-off value H2 that sets to step 2) in the stray field that produces measure, the output signal (being magnetic leakage signal) of ultrasound echo signal that picks up and Magnetic Flux Leakage Inspecting element is sent in the signal processing unit;
4) respectively the echoed signal of sending in the ultrasound echo signal passage is amplified and Filtering Processing with the magnetic leakage signal of sending in the magnetic leakage signal passage, the data after will handling are again sent into information handling system respectively after A/D converter converts digital signal to;
5) in information handling system, the digital signal that receives carried out analyzing and processing after, obtain the oscillogram of ultrasound echo signal and magnetic leakage signal, because signal is asynchronous, through translation reaches the purpose that two kinds of signal Synchronization show to the magnetic leakage signal time domain;
6) further the signal waveform image of two kinds of different information of reflection defective after handling in the step 5) is processed into the synchronizing signal that may be displayed on same interface and is presented on the display lower threshold T0 that configures the lower threshold A0 of first echo amplitude and receive the used time of first echo;
7) having under the prerequisite of magnetic leakage signal, the ultrasound echo signal image is analyzed, the amplitude A of first echoed signal that obtains and used time T and setting threshold A0 and T0 are compared; If A A0, then defective is positioned at the inwall of steel plate; If T T0, then defective is positioned at the outer wall or the inside of steel plate; Again through analysis to the magnetic leakage signal image; Adopt conventional Magnetic Flux Leakage Inspecting analytical approach to obtain the shape information of defective; Thereby can realize the location with inside and outside parietal layer time (being the degree of depth) of knowing of defective actual form simultaneously; Reconstruct the defective actual form and the degree of depth, accomplish once detection defective.
In step 1), said EMAT excitation variable winding and EMAT magnetic test coil can be made by two coils respectively, also can be transmitting-receiving integrated coils.
In step 3), said signal processing unit can be provided with ultrasound echo signal passage, magnetic leakage signal passage, amplification filtering module, A/D converter and information handling system.
In step 4), said information handling system can adopt single-chip microcomputer, DSP, PC etc.
Said lift-off value H1 can be 1～4mm, and H2 is 0.2～3mm; Said electromagnetic acoustic signal excites in the gap of conventional Magnetic Flux Leakage Inspecting signal sampling; It is the sinusoidal wave pulse pumping signal of 50kHz ~ 2MHz that said pumping signal adopts frequency; Said Magnetic Flux Leakage Inspecting element is a magnet-sensitive element.
The present invention increases EMAT excitation variable winding that can produce dynamic alternating magnetic field and the EMAT magnetic test coil that receives ultrasonic echo on the ultimate principle of Magnetic Flux Leakage Inspecting; Adopted a kind of redundant scheme of surveying, promptly, utilized two independent detection unit to survey same defective according to the characteristics of leakage field and two kinds of lossless detection methods of electromagnetic acoustic.Utilize the Lift-off effect and the ultrasonic echo measuring principle of electromagnetic acoustic; From the electromagnetic acoustic echoed signal, obtain the depth information of defective; Thereby utilize " complementarity " of two kinds of information that detection method provides; On the basis of Magnetic Flux Leakage Inspecting, realize the location that inside and outside parietal layer is inferior effectively, know when realizing defective actual form and depth information.Therefore in addition, electromagnetic acoustic and Magnetic Flux Leakage Inspecting all belong to " noncontact " Dynamic Non-Destruction Measurement, and two kinds of technology Non-Destructive Testing new technologies of being composited is still " noncontact " type, can satisfy the requirement of actual detected.That the present invention also has is simple in structure, it is efficient and convenient to measure, need not characteristics such as couplant.
Description of drawings
Fig. 1 is the compound detection schematic diagram of electromagnetic acoustic and leakage field; Wherein: thin directional ray is represented the magnetic line of force, and thick directional ray is represented the vertical incidence ultrasound wave of EMAT coil excitation.
Fig. 2 utilizes electromagnetic acoustic to detect the defective principle schematic when being the steel plate zero defect.
The signal waveform u-t figure that EMAT magnetic test coil when Fig. 3 is the steel plate zero defect receives.In Fig. 3, u is the ultrasonic echo amplitude (mV) that receives, and t is time (μ s).
Fig. 4 utilizes electromagnetic acoustic to detect the defective principle schematic when being positioned at the steel plate inwall for defective.
The signal waveform u-t figure that EMAT magnetic test coil when Fig. 5 is positioned at the steel plate inwall for defective receives.In Fig. 5, u is the ultrasonic echo amplitude (mV) that receives, and t is time (μ s).
Fig. 6 utilizes electromagnetic acoustic to detect the defective principle schematic when being positioned at steel plate outer wall or inside for defective.
The signal waveform u-t figure that EMAT magnetic test coil when Fig. 7 is positioned at steel plate outer wall or inside for defective receives.In Fig. 7, u is the ultrasonic echo amplitude (mV) that receives, and t is time (μ s).
Fig. 8 and Fig. 9 are for utilizing Magnetic Flux Leakage Inspecting defective schematic diagram.
In Fig. 1～9, respectively be labeled as: L type magnetic core 1, permanent magnet 2, EMAT excitation variable winding 3, Magnetic Flux Leakage Inspecting element 4, steel plate 5 to be measured, lift-off value H1, lift-off value H2, scanning direction A, the ultrasonic echo B that involves of vertical incidence, magnetic line of force C.
Embodiment
Further specify detection method provided by the invention below in conjunction with accompanying drawing:
Fig. 1 is this method pick-up unit schematic diagram.Pick-up unit of the present invention mainly is made up of L type magnetic core 1, permanent magnet 2, EMAT excitation variable winding 3 (simultaneously also as the EMAT magnetic test coil), Magnetic Flux Leakage Inspecting element 4.Permanent magnet 2 is fixed in the thinner end of L type magnetic core.EMAT excitation variable winding 3 be fixed in permanent magnet 2 under, and place steel plate to be measured 5 tops with certain lift-off value H1.Magnetic Flux Leakage Inspecting element 4 is fixed in the centre at probe two ends, and places steel plate to be measured 5 tops with certain lift-off value H2.
The detection principle of the inventive method is on the ultimate principle of Magnetic Flux Leakage Inspecting; Increase EMAT excitation variable winding that can produce dynamic alternating magnetic field and the EMAT magnetic test coil that receives ultrasonic echo; Utilize the Lift-off effect and the ultrasonic echo measuring principle of electromagnetic acoustic; From the electromagnetic acoustic echoed signal, obtain the depth information of defective, realize the location of inside and outside wall defective level.Combine the Magnetic Flux Leakage Inspecting signal again, adopt conventional Magnetic Flux Leakage Inspecting analytical approach to know the defective shape information, reach the purpose of the reconstruct defective actual form and the degree of depth.
The electromagnetic acoustic test section, shown in Fig. 2～7, the vertical incidence ultrasound wave that utilizes EMAT excitation variable winding 3 to excite detects tested steel plate 5.During zero defect, incident wave produces echo after running into the bottom surface, shown in Fig. 2 and 3; When defective is positioned at tested inner surface of steel plate; Be equivalent to change the lift-off value of EMAT excitation variable winding; Thereby changed the intensity that tested surface of steel plate forms eddy current; Also can obviously influence the intensity of the electromagnetic acoustic that excites, detected first echo amplitude of EMAT magnetic test coil this moment is less than first echo amplitude under the zero defect situation, like Figure 4 and 5; When defective was positioned at tested steel plate outside surface or inside, mainly influence was the action time of ultrasonic echo, and than the zero defect situation, the EMAT magnetic test coil will detect first ultrasonic echo in advance, like Fig. 6 and 7.Signal through the EMAT magnetic test coil is obtained carries out the depth information that analyzing and processing can be known defective.
The Magnetic Flux Leakage Inspecting part; Shown in Fig. 8 and 9, when permanent magnet magnetized tested steel plate 5 to state of saturation, inside surface and external defects can both inspire magnetic leakage signal; Magnetic leakage signal is different because of the form of defective, and the Magnetic Flux Leakage Inspecting element 4 that can both be placed in above the inside surface detects.Utilize the compact arranged Magnetic Flux Leakage Inspecting element of a row to gather magnetic leakage signal, the conventional flux-leakage detection method of the magnetic leakage signal utilization that collects is carried out the shape information that analyzing and processing can be known defective.
Because electromagnetic acoustic and leakage field are different to the direction requirement of bias magnetic field, EMAT coil and the position of Magnetic Flux Leakage Inspecting element on sonde configuration be difference to some extent also.Therefore, when popping one's head in scanning direction motion as shown in Figure 1, for same defective, there is certain fixing hysteresis in the signal of Magnetic Flux Leakage Inspecting.This problem can solve through the translation of signal time domain when the detection signal aftertreatment.After two kinds of signal Synchronization, through electromagnetic acoustic signal and the magnetic leakage signal that analyze to obtain, the just actual form of restructural defective and depth information, and distinguish inside and outside wall defective effectively.
Embodiment
The Q235 steel plate of choosing thickness and be 8mm is as detected object, and permanent magnet is selected long 50mm, wide 30mm, the N35 neodymium iron boron of thick 20mm.The broken line coil that EMAT excitation variable winding (simultaneously also as the EMAT magnetic test coil) adopts P.e.c. (PCB) to make, pcb board is thick to be 1mm, live width is 0.5mm.Sonde configuration is placed the top of steel plate to be measured with the lift-off value of 2mm, use model as the Hall element of AH3503 as the Magnetic Flux Leakage Inspecting element, measure the stray field of surface of steel plate with the lift-off value of 1mm.(4m/min) scans detection to steel plate with certain detection speed.Apply the sinusoidal wave pulse signal of 1MHz in the EMAT excitation variable winding in the gap of Magnetic Flux Leakage Inspecting signal sampling, and with EMAT magnetic test coil detection of echoes signal.With the detected ultrasound echo signal of EMAT magnetic test coil with carry out amplification filtering after the detected magnetic leakage signal of Hall element is sent into different passages respectively and handle; Data after will handling again send into respectively that PC is handled and on display, demonstrate signal waveform synchronously after A/D converter converts digital signal to.
When setting the zero defect situation, the lower threshold A0 of first echo amplitude is 200mV, and receiving the used time T 0 of first echo is 10 μ s.The amplitude A and the time T of detected first ultrasound echo signal are compared with A0, T0 respectively, if A 200mV, then defective is positioned at the inwall of steel plate; < 10 μ s, then defective is positioned at the outer wall or the inside of steel plate as if T.Combine the Magnetic Flux Leakage Inspecting signal again, utilize conventional flux-leakage detection method to know the defective shape information, the actual form of restructural defective and the degree of depth.
The foregoing description only is used for further specifying a kind of electromagnetic acoustic of the present invention and the compound detection method of leakage field; But the present invention is not limited to embodiment; Every foundation technical spirit of the present invention is done any simple modification, equivalent variations and modification to above embodiment, all falls in the protection domain of technical scheme of the present invention.
Claims (10)
1. electromagnetic acoustic and leakage field compound detection device; It is characterized in that being provided with magnetic core, permanent magnet, EMAT excitation variable winding, EMAT magnetic test coil, Magnetic Flux Leakage Inspecting element; Said permanent magnet is fixed in the thinner end of magnetic core, EMAT excitation variable winding, EMAT magnetic test coil be fixed in permanent magnet under and steel plate to be measured top; Said Magnetic Flux Leakage Inspecting element is fixed in the centre at probe two ends and places steel plate to be measured top.
2. a kind of electromagnetic acoustic as claimed in claim 1 and leakage field compound detection device is characterized in that said magnetic core adopts L type magnetic core or U-shaped magnetic core.
3. electromagnetic acoustic and leakage field composite detection method is characterized in that adopting according to claim 1 or claim 2 a kind of electromagnetic acoustic and leakage field compound detection device, and said detection method may further comprise the steps:
1) electromagnetic acoustic and leakage field compound detection device are placed surface of steel plate to be measured; And steel plate to be measured is scanned detection by the lift-off value H1 that sets; Wherein, Permanent magnet, EMAT excitation variable winding, EMAT magnetic test coil and steel plate to be measured constitute electromagnet ultrasonic changer, and electromagnet ultrasonic changer is a kind of hyperacoustic transducing head that in conductor, encourages and receive;
2) in the EMAT excitation variable winding, apply pumping signal, thereby form the electromagnetic ultrasonic wave perpendicular to surface of steel plate incident to be measured, electromagnetic acoustic wave direction steel plate opposite side to be measured is propagated; When running into steel plate outer wall to be measured; To produce ultrasonic echo, simultaneously, under the effect of permanent magnet; Steel plate to be measured to state of saturation, at this moment will be produced stray field at fault location by local magnetized;
3) pick up step 2 through the EMAT magnetic test coil) the middle ultrasonic echo that produces; Simultaneously; Utilize the Magnetic Flux Leakage Inspecting element with the lift-off value H2 that sets to step 2) in the stray field that produces measure, the output signal of ultrasound echo signal that picks up and Magnetic Flux Leakage Inspecting element is sent in the signal processing unit;
4) respectively the echoed signal of sending in the ultrasound echo signal passage is amplified and Filtering Processing with the magnetic leakage signal of sending in the magnetic leakage signal passage, the data after will handling are again sent into information handling system respectively after A/D converter converts digital signal to;
5) in information handling system, the digital signal that receives carried out analyzing and processing after, obtain the oscillogram of ultrasound echo signal and magnetic leakage signal, because signal is asynchronous, through translation reaches the purpose that two kinds of signal Synchronization show to the magnetic leakage signal time domain;
6) further the signal waveform image of two kinds of different information of reflection defective after handling in the step 5) is processed into the synchronizing signal that may be displayed on same interface and is presented on the display lower threshold T0 that configures the lower threshold A0 of first echo amplitude and receive the used time of first echo;
7) having under the prerequisite of magnetic leakage signal, the ultrasound echo signal image is analyzed, the amplitude A of first echoed signal that obtains and used time T and setting threshold A0 and T0 are compared; If A A0, then defective is positioned at the inwall of steel plate; If T T0, then defective is positioned at the outer wall or the inside of steel plate; Again through analysis to the magnetic leakage signal image; Adopt conventional Magnetic Flux Leakage Inspecting analytical approach to obtain the shape information of defective; Thereby can realize knowing and the location of inside and outside parietal layer time of defective actual form simultaneously, reconstruct the defective actual form and the degree of depth, accomplish once detection defective.
4. a kind of electromagnetic acoustic as claimed in claim 3 and leakage field composite detection method is characterized in that in step 1), and said EMAT excitation variable winding and EMAT magnetic test coil are made by two coils respectively, or are a transmitting-receiving integrated coil.
5. a kind of electromagnetic acoustic as claimed in claim 3 and leakage field composite detection method is characterized in that in step 1), and said lift-off value H1 is 1～4mm.
6. a kind of electromagnetic acoustic as claimed in claim 3 and leakage field composite detection method is characterized in that in step 2) in, it is the sinusoidal wave pulse pumping signal of 50kHz ~ 2MHz that said pumping signal adopts frequency.
7. a kind of electromagnetic acoustic as claimed in claim 3 and leakage field composite detection method; It is characterized in that in step 3) said signal processing unit is provided with ultrasound echo signal passage, magnetic leakage signal passage, amplification filtering module, A/D converter and information handling system.
8. a kind of electromagnetic acoustic as claimed in claim 3 and leakage field composite detection method is characterized in that in step 3), and said lift-off value H2 is 0.2～3mm.
9. a kind of electromagnetic acoustic as claimed in claim 3 and leakage field composite detection method is characterized in that in step 3), and said Magnetic Flux Leakage Inspecting element is a magnet-sensitive element.
10. a kind of electromagnetic acoustic as claimed in claim 3 and leakage field composite detection method is characterized in that in step 4), and said information handling system adopts single-chip microcomputer, DSP or PC.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103217481A (en) * | 2013-04-02 | 2013-07-24 | 厦门大学 | Magnetoacoustic tomography-with-magnetic-induction probe applying magnetostriction |
| CN103353478A (en) * | 2013-06-28 | 2013-10-16 | 厦门大学 | Magnetoacoustic tomography and magnetic leakage tomography compounded non-destructive detection method |
| CN103353479A (en) * | 2013-06-28 | 2013-10-16 | 厦门大学 | Electromagnetic ultrasonic longitudinal guided wave and magnetic leakage detection compounded detection method |
| CN105092701A (en) * | 2015-07-24 | 2015-11-25 | 广州彩磁信息技术有限公司 | Electromagnetic ultrasonic detection system based on electromechanical hybrid frequency-modulation energy-gathered irradiation and method |
| CN105181791A (en) * | 2015-09-30 | 2015-12-23 | 西安交通大学 | Pulsed eddy current and electromagnetic ultrasonic composite based nondestructive body defect testing method |
| CN106448187A (en) * | 2016-11-14 | 2017-02-22 | 苏州大学 | Vehicle detection system and vehicle detection method based on fusion of magnetic sensor and ultrasonic sensor |
| CN107064289A (en) * | 2017-01-18 | 2017-08-18 | 中特检科技发展(北京)有限公司 | The methods, devices and systems and sensor of type multimode electromagnetic ultrasound and Magnetic Flux Leakage Inspecting |
| CN110579528A (en) * | 2019-08-13 | 2019-12-17 | 山东电力工业锅炉压力容器检验中心有限公司 | ACFM probe and method for detecting GIS shell D-type weld joint |
| CN111480072A (en) * | 2017-11-13 | 2020-07-31 | 埃克森美孚研究工程公司 | Method of using a non-destructive material inspection system |
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| CN113866261A (en) * | 2021-09-09 | 2021-12-31 | 内蒙古科技大学 | Steel plate defect measuring device and method |
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| CN1865976A (en) * | 2006-06-16 | 2006-11-22 | 清华大学 | Large-area steel plate defect flux-leakage detection method |
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| CN1865976A (en) * | 2006-06-16 | 2006-11-22 | 清华大学 | Large-area steel plate defect flux-leakage detection method |
| CN102159944A (en) * | 2008-06-27 | 2011-08-17 | Pii(加拿大)有限公司 | Integrated multi-sensor non-destructive testing |
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| CN103217481A (en) * | 2013-04-02 | 2013-07-24 | 厦门大学 | Magnetoacoustic tomography-with-magnetic-induction probe applying magnetostriction |
| CN103353478A (en) * | 2013-06-28 | 2013-10-16 | 厦门大学 | Magnetoacoustic tomography and magnetic leakage tomography compounded non-destructive detection method |
| CN103353479A (en) * | 2013-06-28 | 2013-10-16 | 厦门大学 | Electromagnetic ultrasonic longitudinal guided wave and magnetic leakage detection compounded detection method |
| CN103353478B (en) * | 2013-06-28 | 2016-02-03 | 厦门大学 | The compound lossless detection method of a kind of magnetosonic imaging and leakage field imaging |
| CN105092701B (en) * | 2015-07-24 | 2018-09-11 | 广州丰谱信息技术有限公司 | Electromagnetic acoustic detection system and method based on electromechanical mixing frequency modulation cumulative irradiation |
| CN105092701A (en) * | 2015-07-24 | 2015-11-25 | 广州彩磁信息技术有限公司 | Electromagnetic ultrasonic detection system based on electromechanical hybrid frequency-modulation energy-gathered irradiation and method |
| CN105181791A (en) * | 2015-09-30 | 2015-12-23 | 西安交通大学 | Pulsed eddy current and electromagnetic ultrasonic composite based nondestructive body defect testing method |
| CN106448187A (en) * | 2016-11-14 | 2017-02-22 | 苏州大学 | Vehicle detection system and vehicle detection method based on fusion of magnetic sensor and ultrasonic sensor |
| CN106448187B (en) * | 2016-11-14 | 2022-09-23 | 苏州大学 | Vehicle detection system and method based on fusion of magnetic sensor and ultrasonic sensor |
| CN107064289A (en) * | 2017-01-18 | 2017-08-18 | 中特检科技发展(北京)有限公司 | The methods, devices and systems and sensor of type multimode electromagnetic ultrasound and Magnetic Flux Leakage Inspecting |
| CN107064289B (en) * | 2017-01-18 | 2024-03-29 | 中特检科技发展(北京)有限公司 | Method, device and system for multi-mode electromagnetic ultrasonic and magnetic leakage detection and sensor |
| CN111480072A (en) * | 2017-11-13 | 2020-07-31 | 埃克森美孚研究工程公司 | Method of using a non-destructive material inspection system |
| CN110579528A (en) * | 2019-08-13 | 2019-12-17 | 山东电力工业锅炉压力容器检验中心有限公司 | ACFM probe and method for detecting GIS shell D-type weld joint |
| CN113311073A (en) * | 2021-04-21 | 2021-08-27 | 武汉科技大学 | Electromagnetic ultrasonic sound time measuring method and system |
| CN113311073B (en) * | 2021-04-21 | 2022-12-02 | 武汉科技大学 | Electromagnetic ultrasonic sound time measuring method and system |
| CN113866261A (en) * | 2021-09-09 | 2021-12-31 | 内蒙古科技大学 | Steel plate defect measuring device and method |
| CN113866261B (en) * | 2021-09-09 | 2023-09-26 | 内蒙古科技大学 | Steel plate defect measuring device and method |
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