CN110320283A - A kind of binary channels probe regulating mechanism and binary channels are popped one's head in the method for detection of water logging high-frequency ultrasonic - Google Patents
A kind of binary channels probe regulating mechanism and binary channels are popped one's head in the method for detection of water logging high-frequency ultrasonic Download PDFInfo
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- CN110320283A CN110320283A CN201910598601.XA CN201910598601A CN110320283A CN 110320283 A CN110320283 A CN 110320283A CN 201910598601 A CN201910598601 A CN 201910598601A CN 110320283 A CN110320283 A CN 110320283A
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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
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0609—Display arrangements, e.g. colour displays
- G01N29/0645—Display representation or displayed parameters, e.g. A-, B- or C-Scan
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- G—PHYSICS
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- 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
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- G01N29/0654—Imaging
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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
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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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
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- 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
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/265—Arrangements for orientation or scanning by relative movement of the head and the sensor by moving the sensor relative to a stationary material
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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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- 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
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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Abstract
The present invention relates to a kind of binary channels probe regulating mechanism and binary channels probe water logging high-frequency ultrasonic methods of detection, belong to steel flaw detection equipment technical field.Including the first probe holder and the second probe holder, first probe holder is fixed in module, and second probe holder is connect by micro-adjusting mechanism with module activities, the horizontal rotation angle for the second probe holder of trace regulation；First probe holder, the second probe holder bottom pass through level(l)ing mechanism respectively and are flexibly connected with corresponding first clamp port and the second clamp port, and first clamp port is for being arranged the first probe, and second clamp port is for being arranged the second probe.The application passes through the test method of inside gross imperfection in the synchronous detection steel of probe of 2 different frequencies to analyze defect location, while evaluating the inside macroscopic view degree of purity of steel；The synchronous Subarea detecting for realizing sample to be tested, reduces the check frequency of sample, improves detection accuracy, is conducive to the degree of purity inside comprehensive Fast Evaluation steel.
Description
Technical field
The present invention relates to a kind of binary channels probe regulating mechanism and binary channels probe water logging high-frequency ultrasonic methods of detection, belong to
In steel flaw detection equipment technical field.
Background technique
As client requires also to be continuously improved to steel product quality, an important indicator of the steel degree of purity as steel product quality
It is required that higher and higher.Therefore, the control and detection of internal macroscopic view and microdefect size become metallurgical scientific and technical personnel and inspection in steel
Survey personnel's major tasks content.
There is much the non-destructive test method of macroscopical degree of purity inside detection steel, steel ultrasonic examination be one kind compared with
The method of common detection steel product quality, compared to other detection means, ultrasonic examination has many advantages, such as: Neng Gou
Detected under the premise of not destroying workpiece, be pollution-free, is harmless, testing result is more accurate, easy to use, speed is fast and
Convenient for on-site test etc..Under normal conditions, when the relatively rough workpiece in surface is detected a flaw using conventional levigation method, detection effect is often
It is very poor, and water logging ultrasonic examination can be good at adapting to the flaw detection of such workpiece.Immersed ultrasonic test method also has letter
The features such as number stabilization, signal-to-noise ratio be high, automation easy to accomplish.But the signal strength of immersed ultrasonic test is very weak, generally requires
By attenuator gain be transferred to it is very high could find the defects of workpiece echo, according to experimental study, when the probe using same frequency
When, the signal strength of immersed ultrasonic test and levigation method difference in signal strength 20dB or so.So generally using poly- in water logging flaw detection
Coke probe is to increase signal strength, although the method can increase signal strength to a certain degree, due to the sound of focusing probe
Beam is unevenly distributed, cause actually detected effect be not it is ideal, need repeatedly detect a flaw could be by defect existing for steel
Parameter detecting comes out, and wastes detection time significantly, reduces detection efficiency.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of binary channels probe regulating mechanism for the above-mentioned prior art
For installing the ultrasonic probe of two operations simultaneously, it is achieved in binary channels probe water logging high-frequency ultrasonic method of detection, is adopted
The defect to different depth present in steel, size is able to achieve with the two primary detections of probe warp with different detection frequencies
It is detected, shortens detection time, improve detection accuracy.
The present invention solves the above problems used technical solution are as follows: a kind of binary channels is popped one's head in regulating mechanism, which sets
It sets in the module that can be gone up and down on Z-direction (vertical direction), including the first probe holder and the second probe holder, described first
Probe holder is fixed in module, and second probe holder is connect by micro-adjusting mechanism with module activities, is used for trace regulation second
The deflection of the opposite Z-direction of probe holder；First probe holder, the second probe holder bottom pass through respectively level(l)ing mechanism with
Corresponding first clamp port and the second clamp port are flexibly connected, for adjusting the first clamp port and the second clamp port in the horizontal direction
On position, first clamp port for be arranged first probe, second clamp port for be arranged second probe.
The micro-adjusting mechanism includes movable disc, elastic top rod, thousand points of bars of ejection and shifting block, and the movable disc is erect
It is arranged in module side, movable disc can be around central shaft in vertical plane intrinsic deflection, and the shifting block is fixed on the movable disc
Edge, the elastic top rod is located at shifting block side and elasticity withstands shifting block always, and it is another that thousand points of bars of the ejection are located at shifting block
Side reversely pushes shifting block to make reversely to resist elastic top rod.
The level(l)ing mechanism includes fixed block, adjusting block and adjusting screw rod, and the fixed block is fixed on probe holder bottom
Portion, the adjusting block are fixedly connected with clamp port, and the adjusting screw rod is horizontally set on fixed block, adjusting screw rod and adjusting block
It is threadedly coupled, adjusting block can be along the adjusting screw rod horizontal displacement of rotation.
A kind of binary channels probe water logging high-frequency ultrasonic method of detection, the method specifically comprise the following steps:
(1) binary channels probe regulating mechanism installation: binary channels probe regulating mechanism setting is visited in water logging high-frequency ultrasonic
In the module for hurting instrument Z axis, two probes with different frequency are set in the first clamp port and the second clamp port, and by two
Probe is connect with standard UHF interface；
(2) instrument calibration is debugged: standard specimen being set in high-frequency ultrasonic defectoscope sink, the first probe and second is adjusted and visits
The incident angle of head is mutually perpendicular to flat-bottom hole in the incident direction and standard specimen of the first and second probe；By adjustment module in Z axis side
To position, probe and water layer distance are adjusted, so that the echo of flat hole defect is maximum on standard specimen；Adjust gain determines two
The basic dB value of probe；
(3) sample is heat-treated and processes: after being heat-treated to pole sample to be detected, specimen surface carries out railway carriage again
And polish, reduce check frequency；
(4) sample scans: the pole sample of step 3 is set on the chuck of water logging high-frequency ultrasonic defectoscope sink, is opened
Dynamic dual channel mode, carries out system to water logging supersonic detector and returns to zero, and then adjusts the incident angle of the first and second probe, visits
Grease head highness；Sample parameter, defectoscope flaw detection stepping rate are inputted, the first and second probe is made to synchronize Scanning Detction；
(5) detect: dual probe can each self-forming A, C-scan figure after the end of scan；When field trash is arrived in scanning in A sweep figure
Shi Shengbo can reflect, and ordinate echo height represents the size of field trash in figure, abscissa represent field trash away from
The position of specimen surface and depth；The corresponding perspective view of A sweep figure, that is, C-scan figure: the depth of color represents echo height,
Abscissa represents the case where sample expansion；Ordinate illustrates the size and quantity of field trash；
If desired positioning analysis is carried out to field trash in sample, C-scan figure, application probe return is opened by analysis software
Function, which is moved to, is mingled with object location, 360 ° of spinning samples, the examination when field trash reflection echo maximum, immediately below probe vertical
Sample surface marks, which is position nearest apart from field trash on epidermis, while having recorded field trash size, quantity
And distributed intelligence.
Sample grows 300~600mm, 30~120mm of diameter in the step 3, and meets finish < 1.0 μm, curvature
≤2mm/m。
It pops one's head in water compared with the prior art, the advantages of the present invention are as follows a kind of: binary channels probe regulating mechanism and binary channels
High-frequency ultrasonic method of detection is soaked, binary channels probe regulating mechanism is set directly on the Z axis of water logging supersonic detector, is passed through
The test method of internal gross imperfection is analyzed defect location in the synchronous detection steel of the probe of 2 different frequencies, evaluates simultaneously
The inside macroscopic view degree of purity of steel.Entire the test period is short, does not destroy sample, the subregion inspection of synchronous realization sample to be tested radially
It surveys, further decreases the check frequency of sample, improve accuracy in detection, be conducive to pure inside comprehensive Fast Evaluation steel
Degree, qualitative analysis is positioned and dissected for further field trash seems extremely important.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of binary channels probe regulating mechanism of the embodiment of the present invention；
Fig. 2 is the resulting A figure of 10MHz scanning probe；
Fig. 3 is the resulting C figure of 10MHz scanning probe；
Fig. 4 is the resulting A figure of 25MHz scanning probe；
Fig. 5 is the resulting C figure of 25MHz scanning probe；
1 module, 2 micro-adjusting mechanisms, 2.1 ejection micrometers, 2.2 movable discs, 2.3 elastic top rods, 2.4 shifting blocks, 3 in figure
First probe holder, 4 second probe holders, 5 first clamp ports, 6 second clamp ports, 7 level(l)ing mechanisms, 7.1 fixed blocks, 7.2 are adjusted
Locking nub, 7.3 adjusting screw rods.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
The regulating mechanism as shown in Figure 1, one of the present embodiment binary channels is popped one's head in, mechanism setting is can be in Z axis side
In the module 1 gone up and down upwards.The regulating mechanism includes the first probe holder 3 and the second probe holder 4 set on the same side, the first probe
Frame 3 is fixed on module 1, and the second probe holder 4 is flexibly connected by micro-adjusting mechanism 2 with module 1,2 trace regulation second of micro-adjusting mechanism
The rotation angle of probe holder；First probe holder 3 and 4 bottom of the second probe holder pass through level(l)ing mechanism 7 and corresponding respectively
One clamp port 5 and the second clamp port 6 are flexibly connected, and level(l)ing mechanism 7 adjusts the side of the first clamp port 5 and the second clamp port 6
Position.First probe is arranged in the first clamp port 5, the second probe is arranged in the second clamp port 6.By adjusting module 1 in Z
Position on axis carries out height adjustment to the first probe and the second probe；Level(l)ing mechanism 7 to first probe incident angle into
Row is adjusted；The incident angle of the second probe is adjusted in level(l)ing mechanism 7 and micro-adjusting mechanism 2, realizes the same stepping of dual probe
Row detection effectively shortens detection time to realize the Subarea detecting of sample to be tested, greatly improves sample detection efficiency.
Above-mentioned micro-adjusting mechanism includes movable disc 2.2, elastic top rod 2.3, thousand points of bars 2.1 of ejection and shifting block 2.4, activity
Disk 2.2, which is erect, to be arranged in 1 side of module, and movable disc 2.2 can be around central shaft in vertical plane intrinsic deflection, movable disc 2.2
It is fixedly connected with the second probe holder 4, when movable disc 2.2 deflects, the second probe holder 4, which synchronizes, to deflect.Shifting block 2.4
It is fixed on the top edge of movable disc 2.2, elastic top rod 2.3 is located at 2.4 side of shifting block and elasticity withstands shifting block always
2.4, it ejects thousand points of bars 2.1 and is set in movable disc 2.2, eject thousand points of bars 2.1 and be located at 2.4 other side of shifting block and reversely push group
Block 2.4 makes reversely to resist elastic top rod 2.3.When ejection thousand divide bar 2.1 to elastic top rod 2.3 close to when, eject thousand points of bars
2.1 resist shifting block 2.4 to knock-pin 2.3 close to and knock-pin 2.3 is pushed back, shifting block 2.4 drives movable disc 2.2 to elastic top
2.3 side of rod deflects；When ejection thousand divide bar 2.1 to elastic top rod 2.3 far from when, elastic top rod 2.3 ejection and band
Dynamic shifting block 2.4 divides bar 2.1 to push up closely to ejection thousand, and shifting block 2.4 drives movable disc 2.2 to divide 2.1 side of bar to deflect to ejection thousand,
To adjust the angle of the second probe holder 4 deflection.
Ejection thousand in the present embodiment divides bar to be the micrometer head of outside micrometer.
Above-mentioned level(l)ing mechanism 7 includes fixed block 7.1 and adjusting block 7.2, and fixed block 7.1 is fixed on probe holder bottom,
Adjusting block 7.2 is fixedly connected with clamp port, and fixed block 7.1 is equipped with groove, and adjusting block 7.2 is equipped with convex block, groove and convex block
Match to merge and adjusting screw rod 7.3 is inserted into fixed block 7.1 and adjusting block 7.2, so that fixed block 7.1 and adjusting screw rod 7.3 are solid
Fixed connection, adjusting block 7.2 are flexibly connected with adjusting screw rod 7.3.When turn adjusting screw rod 7.3, realize adjusting block 7.2 along tune
The movement of 7.3 track of screw rod is saved, to adjust the position of grip block.
A kind of probe water logging high-frequency ultrasonic method of detection of binary channels specifically comprises the following steps:
Step 1: binary channels probe regulating mechanism is arranged in the module 1 of water logging high-frequency ultrasonic defectoscope Z axis, will
10MHz probe as the first probe and the 25MHz probe as the second probe are respectively arranged on the first aid mouth 5 and the second clamping
In mouth 6, and two probes are connect with standard UHF interface, is connected with image analysis software；
Step 2: standard specimen is placed in high-frequency ultrasonic defectoscope sink, first adjusts level(l)ing mechanism 7, then adjust
Micro-adjusting mechanism 2, so that the first probe, the second probe are mutually perpendicular to (i.e. incident angle is 90 °) with flat-bottom hole on standard specimen；Pass through hand
Dynamic position of the adjustment module 1 on Z axis adjusts the first probe, the second probe at a distance from water layer, so that flat-bottom hole lacks on standard specimen
Fall into echo amplitude peak；Lock module.At this point, adjust gain determines the basic dB value of 2 probes so that wave amplitude is 80%；
Step 3: it takes and is about 300mm, diameter about 60mm pole sample and is quenched and be tempered and to pole specimen surface vehicle
Skin simultaneously polishes, so that the finish of sample is 0.8 μm, curvature 1.8mm/m, to reduce check frequency；
Step 4: the pole sample of step 3 being set on the chuck of water logging high-frequency ultrasonic defectoscope sink, and starting is double
Channel pattern carries out system to water logging supersonic detector and returns to zero, and first passes through the incidence that level(l)ing mechanism adjusts the first probe
Angle, incident angle are 90 °, and the incident angle of the second probe is adjusted by level(l)ing mechanism and micro-adjusting mechanism,
So that incident angle is similarly 90 °, the first probe and the second probe height are then adjusted；And sample parameter, defectoscope are detected a flaw
The parameters such as stepping, speed are input to water logging high-frequency ultrasonic defectoscope, realize that dual probe synchronizes Scanning Detction；
Step 5: as shown in Fig. 2,3,4,5, dual probe each self-forming A of meeting, C-scan figure, A sweep figure after the end of scan
In when scanning is to field trash sound wave can reflect, ordinate echo height represents the size of field trash, horizontal seat in figure
Mark represents position and depth of the field trash away from specimen surface；The corresponding perspective view of A sweep figure, that is, C-scan figure: the depth of color
Echo height is represented, abscissa represents the case where sample is unfolded；Ordinate illustrates the size sum number of field trash
Amount；
If desired positioning analysis is carried out to field trash in sample, C-scan figure, application probe return is opened by analysis software
Function, which is moved to, is mingled with object location, 360 ° of spinning samples, the examination when field trash reflection echo maximum, immediately below probe vertical
Sample surface marks, which is position nearest apart from field trash on epidermis, while having recorded field trash size, quantity
And distributed intelligence.
Overall step includes: the installation of 1. binary channels probe regulating mechanism and probe；2. carrying out high frequency ultrasound using standard specimen
The calibration of wave inspection instrument；3. sample is processed；4. dual probe is scanned detection simultaneously after installation sample；5. being popped one's head according to two frequencies
A, the C-scan figure of each self-forming are analyzed respectively determines the information such as size, quantity and distribution of defect in sample.
The present invention is that binary channels probe regulating mechanism is arranged directly on water logging supersonic detector, passes through 2 different frequencies
The test method of internal gross imperfection carrys out the defect location analysis to different depth in the synchronous detection steel of the probe of rate, evaluates simultaneously
The inside macroscopic view degree of purity of steel.Entire the test period is short, does not destroy sample, the synchronous Subarea detecting for realizing sample to be tested, into one
Step reduces the check frequency of sample, improves detection accuracy, is conducive to the degree of purity inside comprehensive Fast Evaluation steel, for into one
The positioning of step field trash and dissection qualitative analysis seem extremely important.
In addition to the implementation, all to use equivalent transformation or equivalent replacement the invention also includes there is an other embodiments
The technical solution that mode is formed should all be fallen within the scope of the hereto appended claims.
Claims (5)
- The regulating mechanism 1. a kind of binary channels is popped one's head in, the mechanism are arranged in the module (1) that can be gone up and down in the Z-axis direction, including First probe holder (3) and the second probe holder (4), first probe holder (3) are fixed in module, second probe holder (4) It is flexibly connected by micro-adjusting mechanism (2) with module (1), is used for the inclined of the opposite Z-direction of the second probe holder of trace regulation (4) Turn；First probe holder (3), the second probe holder (4) bottom pass through level(l)ing mechanism (7) and corresponding first clamping respectively Mouth (5) and the second clamp port (6) are flexibly connected, for adjusting the first clamp port (5) and the second clamp port (6) in the horizontal direction Position, first clamp port (5) for be arranged first probe, second clamp port (6) for be arranged second probe.
- The regulating mechanism 2. a kind of binary channels according to claim 1 is popped one's head in, it is characterised in that: micro-adjusting mechanism (2) packet Include movable disc (2.2), elastic top rod (2.3), thousand points of bars (2.1) of ejection and shifting block (2.4), the movable disc (2.2) Setting is erect in module (1) side, and movable disc can be around central shaft in vertical plane intrinsic deflection, the shifting block (2.4) is fixed At the edge of the movable disc (2.2), the elastic top rod (2.3) is located at shifting block (2.4) side and elasticity is withstood always Shifting block, thousand points of bars of the ejection are located at shifting block (2.4) other side and shifting block (2.4) are reversely pushed to make reversely to resist elastic top rod (2.3)。
- The regulating mechanism 3. a kind of binary channels according to claim 1 is popped one's head in, it is characterised in that: the level(l)ing mechanism It (7) include fixed block (7.1), adjusting block (7.2) and adjusting screw rod (7.3), the fixed block (7.1) is fixed on probe holder bottom Portion, the adjusting block (7.2) are fixedly connected with clamp port, and the adjusting screw rod (7.3) is horizontally set on fixed block (7.1), Adjusting screw rod (7.3) is threadedly coupled with adjusting block (7.2), and adjusting block (7.2) can be horizontal along the adjusting screw rod (7.3) of rotation Displacement.
- 4. based on a kind of binary channels probe water logging high-frequency ultrasonic method of detection any in claims 1 to 3, feature Be: the method specifically comprises the following steps:Step 1: binary channels probe regulating mechanism installation: binary channels probe regulating mechanism setting is visited in water logging high-frequency ultrasonic Hurt in the module (1) of instrument Z axis, two probes with different frequency are set to the first clamp port (5) and the second clamp port (6) It is interior, and two probes are connect with standard UHF interface；Step 2: instrument calibration debugging: standard specimen is set in high-frequency ultrasonic defectoscope sink, is adjusted the first probe and second and is visited The incident angle of head is mutually perpendicular to flat-bottom hole in the incident direction and standard specimen of the first and second probe；By adjustment module (1) in Z The position of axis direction adjusts probe and water layer distance, so that the echo of flat hole defect is maximum on standard specimen；Adjust gain determines The basic dB value of two probes；Step 3: sample is heat-treated and processes: after being heat-treated to pole sample to be detected, specimen surface carries out railway carriage again And polish, reduce check frequency；Step 4: sample scans: the pole sample of step 3 is set on the chuck of water logging high-frequency ultrasonic defectoscope sink, is opened Dynamic dual channel mode, carries out system to water logging supersonic detector and returns to zero, and then adjusts the incident angle of the first and second probe, visits Grease head highness；Sample parameter, defectoscope flaw detection stepping rate are inputted, the first and second probe is made to synchronize Scanning Detction；Step 5: detection: dual probe can each self-forming A, C-scan figure after the end of scan；When field trash is arrived in scanning in A sweep figure Shi Shengbo can reflect, and ordinate echo height represents the size of field trash in figure, abscissa represent field trash away from The position of specimen surface and depth；The corresponding perspective view of A sweep figure, that is, C-scan figure: the depth of color represents echo height, Abscissa represents the case where sample expansion；Ordinate illustrates the size and quantity of field trash；If desired positioning analysis is carried out to field trash in sample, C-scan figure, application probe return function is opened by analysis software It is moved to and is mingled with object location, 360 ° of spinning samples, the sample table when field trash reflection echo maximum, immediately below probe vertical Face marks, which is position nearest apart from field trash on epidermis, while having recorded field trash size, quantity and having divided Cloth information.
- The water logging high-frequency ultrasonic method of detection 5. a kind of binary channels according to claim 4 is popped one's head in, it is characterised in that: described Sample grows 300~600mm, 30~120mm of diameter in step 3, and meets finish < 1.0 μm, curvature≤2mm/m.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110907535A (en) * | 2019-12-05 | 2020-03-24 | 广西电网有限责任公司电力科学研究院 | Defect positioning guided wave detection method based on rotary scanning |
| CN112129838A (en) * | 2020-10-29 | 2020-12-25 | 杭州道森科技有限公司 | Dual-track defect positioning device |
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