CN109839433A - Metallic conduit defect location detection device and method based on collection magnetic surface scanning - Google Patents
Metallic conduit defect location detection device and method based on collection magnetic surface scanning Download PDFInfo
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Abstract
The invention discloses metallic conduit defect location detection devices and method based on collection magnetic surface scanning, belong to pipeline non-destructive testing technical field, device includes: permanent magnet, optical fiber magneto-sensitive probe array, signal connection optical cable, fiber coupling module, sensing light source module, photoelectric conversion module, three dimension location module and signal processing module.Method includes: to measure the size of return light optical power to collect magnetic surface and scan metallic conduit to be measured, if the size of return light optical power changes, defect is not present in metallic conduit existing defects to be measured, otherwise, metallic conduit to be measured.The feature that the present invention is with high security, application range is wide, high sensitivity, spatial resolution are high.
Description
Technical field
The present invention relates to pipeline non-destructive testing technical fields, more particularly to the oil-gas transportation metal tube based on collection magnetic surface scanning
Road defects detection and defect positioning device and method.
Background technique
Pipeline is transporting petroleum, natural gas and product oil is most economical, most safely and effectively one of mode, is widely used in original
The transport of oil, finished product oil and gas.Pipeline transportation has become the lifeblood of Chinese national economy, and annual all with very high speed
Degree is increasing, but increasing with pipeline, the growth in pipe age, pipeline due to corrosion failure caused by perforation leakage accident frequency
Hair, not only has brought tremendous economic losses, and also serious ground contamination environment and can destroy ecology, or even fire explosion, prestige occurs
Coerce the life security of the people.Therefore, it is necessary to periodically carry out defects detection to pipeline using pipeline defect detection the relevant technologies, most
Reach the guarantee to oil-gas pipeline and maintenance purpose eventually.
According to the position of defect property and generation, using lossless detection methods such as ultrasound, magnetic powder, vortex, leakage fields to pipeline
The defects of defect is detected, and wherein Magnetic Flux Leakage Inspecting is relatively good detection method, can detect the crackle, hole, abrasion of tube body.
Magnetic Flux Leakage Inspecting is a kind of automatic Nondestructive to be grown up with being automated as purpose, leakage field similar with Magnetic testing
Detecting common sensor has induction coil, magnetodiode (SMD), tape, fluxgate, magnetic probe, Hall element etc., in reality
These sensors in the use of border there is a problem in that:
1. the sensitivity of these sensors is lower, faint magnetic leakage signal is detected to realize, generally requires to be close to casing
Wall, for sensor because moving serious wear, sensor service life is very short.
2. longitudinal space resolution is determined by detecting module volume, movement velocity and data sample rate, under array detection,
High sampling rate difficult to realize, that is, be difficult to obtain longitudinal high-space resolution defects detection.
3. the principle of induction coil is electromagnetic induction principle, i.e., the conductor of closed circuit is when the magnetic field intercepts magnetic line of force moves
Electric current can be generated, to convert electric signal for magnetic signal, electric spark phenomenon can be generated, safe coefficient is low；
4. magnetodiode reduces measurement accuracy because of its temperature coefficient and the non-linear of output to a certain extent；
5. it is high that tape detects subtraction unit complexity degree；
6. fluxgate sensor can only detect Slowly Varying magnetic field and static magnetic field, application range is narrow；
Prevent it from being used widely 7. magnetic probe measurement range is narrow, magnetic conductivity is non-linear；
8. Hall element device is more crisp, rapid wear, sensitivity is not high enough.
Summary of the invention
In order to solve the above technical problems, The present invention provides the oil-gas transportation metallic conduits based on magnetic rotation effect to lack
Detection method and device are fallen into, existing apparatus sensor service life is short, spatial resolution is not high to solve, safety is not high enough,
The problems such as application range is narrow.
Present invention provide the technical scheme that the metallic conduit defect location detection device based on collection magnetic surface scanning, device
Include:
Permanent magnet, optical fiber magneto-sensitive probe array, signal connection optical cable, sensing light source module and photoelectric conversion module；It passes
The light source of photosensitive source module output connects optical cable transmission to optical fiber magneto-sensitive probe array, optical fiber magneto-sensitive probe array through signal
It exports return light and connects optical cable transmission to photoelectric conversion module through signal；
The permanent magnet includes at least one first permanent magnet and the second permanent magnet, and two permanent magnets are put so that same polarity is opposite
It sets, collection magnetic surface is formed by the adjustment of magnet strength and distance；The optical fiber sensing probe array is set between two permanent magnets,
On collection magnetic surface.
The optical fiber magneto-sensitive probe array includes at least two optical fiber magneto-sensitive probes, is arranged in certain circumferential space
Column；Optical fiber magneto-sensitive probe includes optical fiber collimator, the polarizer, magneto-optical crystal, analyzer, reflecting mirror, the optical fiber collimator
One end connection signal connects optical cable, and the other end is Nian Jie with magneto-optical crystal one end through the polarizer, and the magneto-optical crystal other end passes through analyzing
Device composition optical transport circuit Nian Jie with reflecting mirror.
Specifically, device further includes coaxial packaging fixed beam, and first permanent magnet and the second permanent magnet are through described
Coaxial packaging fixed beam.
Specifically, device further includes fiber coupling module, and fiber coupling module includes at least one fiber coupler.
Specifically, device further includes three dimension location module, and three dimension location module includes gyroscope, acceleration biography
Sensor.
Specifically, device further includes signal processing module, and signal processing module includes signal amplification circuit, multichannel A/D
Data module, embedded computer, memory module.
Specifically, photoelectric conversion module includes at least one highly sensitive photodetector, can be changed to Weak magentic-field
It is detected.
Specifically, the port a connection of light source module output end and fiber coupling module, the port of fiber coupling module are sensed
B is connect through signal connection optical cable, three dimension location module with optical fiber magneto-sensitive probe array, the port c of fiber coupling module
It is connect with photoelectric conversion module one end, the photoelectric conversion module other end is connect with signal processing module.
Further, a kind of metallic conduit defect location detection method based on collection magnetic surface scanning, method includes light data
Collection step, defect detection procedure；The light data collection step the following steps are included:
S01: at least one first permanent magnet and the second permanent magnet that permanent magnet includes are collected with same polarity formation staggered relatively
Magnetic surface scans metallic conduit to be measured to collect magnetic surface；
S02: the optical fiber magneto-sensitive probe array received input light between the first permanent magnet and the second permanent magnet, input
Light exports return light after optical fiber collimator, the polarizer, magneto-optical crystal, analyzer and reflecting mirror；
The defect detection procedure the following steps are included:
S03: the size of measurement return light optical power, if the size of return light optical power changes, metal tube to be measured
Defect is not present in road existing defects, otherwise, metallic conduit to be measured.
Specifically, the specific steps for measuring the size of return light optical power include: that return light is passed by signal connection optical cable
It is defeated to arrive photoelectric conversion module, the size for the light optical power that photoelectric conversion module measurement returns.
Specifically, optical fiber magneto-sensitive probe array includes at least two optical fiber magneto-sensitive probes, and the method also includes lacking
Positioning step is fallen into, the defect location step specifically includes following sub-step:
S11: permanent magnet, optical fiber magnetic susceptibility head array and the three dimension location module of coaxial packaging one are transported in oil gas
It is moved in pipeline, realizes the comprehensive scanning of oil and gas transportation pipeline；
S12: with the scanning along oil and gas transportation pipeline length direction, each optical fiber magnetosensitive of optical fiber magnetic susceptibility head array
Sense head exports a characteristic curve, if strong signal peak, metallic conduit existing defects to be measured, if curve is occurs in curve
Gentle then indicate pipeline zero defect, defect is not present in metallic conduit to be measured.
S13: the output of entire optical fiber magnetic susceptibility head array forms two dimensional image；
S14: permanent magnet, optical fiber magnetic susceptibility head array and three dimension location of the signal processing module through coaxial packaging one
The scanning speed of module, strength information obtain certain characteristic curve institute body in the two dimensional image of optical fiber magnetic susceptibility head array output
The corresponding three dimensional orientation of existing defect and depth information.
Compared with prior art, the medicine have the advantages that
(1) by the way that two block permanent magnets are staggered relatively with same polarity, the magnetic line of force of sending is compressed to form thin collection magnetic recording level
Face, using collection magnetic recording level Surface scan oil and gas transportation pipeline, longitudinal space resolution ratio is only decided by collect the thickness of magnetic surface, compared to existing
Technology can effectively improve longitudinal space resolution ratio.
(2) using collection magnetic surface scanning, and the high sensitivity detection of fiber optic weak magnetic field sensor is combined, magnetic-field-sensitive member
Part does not need to be close to tube wall, and the volume of entire measuring device can be done small, on the one hand increases entire measuring device in oil-gas pipeline
Without replacing optical fiber magnetic susceptibility array, on the other hand middle percent of pass is suitable for the oil and gas transportation pipeline test of a variety of calibers
The service life of the present apparatus can be then greatly increased, working service cost is reduced.
(3) safe and reliable lightwave signal is converted for magnetic field strength information transform mode by magneto-optical crystal, and by wave
Optical signal is transmitted with optical fiber, has anti-electromagnetic interference capability strong, essential safety (electric spark etc. will not be generated) it is reliable and
The features such as high temperature resistant.
(4) optical fiber magnetic susceptibility array has that small in size, high sensitivity, anti-oxidant, antiacid caustic corrosion ability is strong, the service life is long
Feature is, it can be achieved that array distributed, real-time online, permanent monitoring.
(5) by the permanent magnet of coaxial packaging one, optical fiber magnetic susceptibility head array and three dimension location module in oil gas
It is moved in conveying pipe, realizes the defect location of oily metallic conduit.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 is the structural block diagram of the device of the embodiment of the present invention 1；
Fig. 2 is that the optical fiber magnetic susceptibility head array of the embodiment of the present invention 1 arranges schematic diagram；
Fig. 3 is the optical fiber magneto-sensitive probe array structure schematic diagram of the embodiment of the present invention 1.
Label in figure specifically indicates: 1- coaxial packaging fixed beam, 2- permanent magnet, the first permanent magnet of 21-, 22- second are forever
Magnet, 3- optical fiber magneto-sensitive probe array, 31- optical fiber collimator, 32- light polarization plate, 33- magneto-optical crystal, 34- polarizing film, 35-
Reflecting mirror, 4- metallic conduit to be measured, 5- signal connection optical cable, 6- fiber coupling module, 7- sense light source module, 8- photoelectric conversion
Module, 9- three dimension location module, 10- signal processing module
Specific embodiment
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, with reference to the accompanying drawing further
The technical schemes of the invention are described in detail, it should be understood that and embodiment described herein is merely to illustrate and explain the present invention, and
It is not used in the restriction present invention.
Embodiment 1
Metallic conduit defect location detection device of the one kind 1. based on collection magnetic surface scanning is present embodiments provided, such as Fig. 1 institute
Show, device includes:
Permanent magnet 2, optical fiber magneto-sensitive probe array 3, signal connection optical cable 5, sensing light source module 7 and photoelectric conversion module
8；The light source that sensing light source module 7 exports is transferred to optical fiber magneto-sensitive probe array 3, optical fiber magnetic susceptibility through signal connection optical cable 5
Linear transducer array 3 exports return light and is transferred to photoelectric conversion module 8 through signal connection optical cable 5；
Permanent magnet 2 includes at least one first permanent magnet 21 and the second permanent magnet 22, and two 2 both ends of permanent magnet are with same polarity
It is staggered relatively, by adjusting the thin collection magnetic surface of the formation of magnetic field strength and spacing distance, ferromagnetic metal pipeline is scanned with magnetic surface
When encountering defect, collection magnetic surface causes magnetic field strength to change because of the missing magnetic line of force.
Optical fiber magneto-sensitive probe array 3 includes at least two optical fiber magneto-sensitive probes, in certain circumferential space arrangement,
Arrangement mode as shown in Fig. 2, but be not limited to the arrangement mode of Fig. 2, to realize oil and gas transportation pipeline respectively to collection magnetic surface magnetic field strength
Variation carries out omnidirectional detection, guarantees the high spatial resolution detection of oil and gas transportation pipeline omnidirectional；Optical fiber magneto-sensitive probe includes
Optical fiber collimator 31, the polarizer 32, magneto-optical crystal 33, analyzer 34, reflecting mirror 35, connection type is as shown in figure 3, optical fiber is quasi-
Straight 31 one end connection signal of device connects optical cable 4, and the other end is Nian Jie with 33 one end of magneto-optical crystal through the polarizer 32, and magneto-optical crystal 33 is another
One end passes through the composition optical transport circuit Nian Jie with reflecting mirror 35 of analyzer 34.
As an option, optical fiber magnetic susceptibility head array 3, which detects different metallic conduit workpiece 4 to be measured, can lead to control optical fiber magnetic
Sensing head quantity meets the defects detection of different oil and gas transportation pipelines to guarantee three-dimensional space resolution ratio.
As an option, device further include coaxial packaging fixed beam 1, the first permanent magnet 21 and the second permanent magnet 22 through
Coaxial packaging fixed beam 1.
As an option, device further includes fiber coupling module 6, and fiber coupling module 6 includes at least one fiber coupling
Device.
Further, sensing light source module 7 exports the lightwave signal of certain power and wavelength.
Further, photoelectric conversion module 8 includes at least one highly sensitive photodetector, can be to Weak magentic-field
Variation is detected, including photoconductive detector and photovoltaic detector.
As an option, device further includes three dimension location module 9, and three dimension location module 9 includes gyroscope, adds
Velocity sensor can perceive the circumferential dimensional orientation of some optical fiber magnetic susceptibility head, to realize oil-gas pipeline defect three-dimensional position
Accurate positioning.
Further, it is solid to carry out coaxial packaging for permanent magnet 2, optical fiber magneto-sensitive probe array 3 and three dimension location module 9
It is fixed, it is moved in oil and gas transportation pipeline, length direction scanning is carried out to oil-gas pipeline.
As an option, device further includes signal processing module 10, and signal processing module 10 includes signal amplification circuit, more
Channel A/D data module, embedded computer, memory module；Magnetic field signal Processing Algorithm, battle array are equipped in signal processing module 10
Column magnetic detection three-dimensional imaging algorithm, handles flaw indication, is analyzed, is judged, to detect the ruler of tested pipeline defect
Very little and location information.
Further, sensing 7 output end of light source module is connect with the port a of fiber coupling module 6, fiber coupling module 6
Port b connect through signal connection optical cable 5, three dimension location module 9 with optical fiber magneto-sensitive probe array 3, fiber coupling mould
The port c of block 6 is connect with 8 one end of photoelectric conversion module, and 8 other end of photoelectric conversion module is connect with signal processing module 10.
On the one hand device based on the inventive concept passes through two block permanent magnets 2 and collects magnetic surface with same polarity formation staggered relatively,
Scan oil and gas transportation pipeline；On the other hand then optical fiber magnetic susceptibility head is arranged in certain array, accurately perception collection magnetic surface three
The change of magnetic field strength of dimension space realizes that the high-space resolution of oil and gas transportation pipeline defect is accurately positioned detection.
Embodiment 2
The present embodiment and the inventive concept having the same of embodiment 1 provide a kind of metal tube based on collection magnetic surface scanning
Road defect location detection method, method include light data collection step, defect detection procedure.
Further, light data collection step the following steps are included:
S01: at least one first permanent magnet 21 and the second permanent magnet 22 that permanent magnet 2 includes are with same polarity shape staggered relatively
At collection magnetic surface, metallic conduit 4 to be measured is scanned to collect magnetic surface；
S02: the optical fiber magneto-sensitive probe array 3 between the first permanent magnet 21 and the second permanent magnet 22 receives input
Light, input light export return light after optical fiber collimator 31, the polarizer 32, magneto-optical crystal 33, analyzer and reflecting mirror；
Further, the defect detection procedure the following steps are included:
S03: the size of measurement return light optical power, if the size of return light optical power changes, metal tube to be measured
Defect is not present in 4 existing defects of road, otherwise, metallic conduit 4 to be measured.
Further, in step S03, the specific steps for measuring the size of return light optical power include: that return light passes through
Signal connection optical cable 5 is transferred to photoelectric conversion module 8, the size for the light optical power that the measurement of photoelectric conversion module 8 returns.
Further, the detailed operation principle that metallic conduit to be measured is detected in the present embodiment with the presence or absence of defect is as follows:
Two pieces of permanent magnets 2 are staggered relatively with same polarity, collection magnetic surface formed by the adjustment of magnet strength and distance, when this dress
It sets and senses the lightwave signal warp that light source module 7 exports certain power and wavelength according to certain velocity scanning metallic conduit 4 to be measured
Signal connection optical cable 5 be transferred to optical fiber magneto-sensitive probe array 3, into optical fiber magneto-sensitive probe array 3 input light through optical fiber
Collimator 31 is collimated to obtain collimated light, and it is brilliant that collimated light enters magneto-optic after optical fiber polarizer 32 is polarized and to form polarised light
Body 33, the magnetic field generated due to permanent magnet and when magnetic direction parallel with light propagation vector direction, due to the method for magneto-optical crystal 33
Magnetic rotation effect is drawn, the polarization direction of light will rotate, and rotate angle, θ and magnetic field strength H and magneto-optical crystal thickness
The product for spending L is directly proportional, it may be assumed that θ=VHL, in formula, it is the characteristic constant of material that V, which indicates Verdet constant,.Magneto-optical crystal 33
The rotation of certain angle is carried out to polarization light polarization direction according to external magnetic field strength information, i.e. the polarization direction of polarised light has occurred
It rotates angle and is the rotation of θ, and the polarised light rotated is transferred to analyzer 34, analyzer 34 selects a certain polarization direction
Light pass through, reflecting mirror 35 make transmission light reflection output return light through signal connection optical cable 5 be transferred to photoelectric conversion module 8.
Analyzer 34 select a certain polarization direction light pass through after, just have the ratio between the light intensity at analyzer both ends according to Malus' law:
I2:I1=COS2θ, in formula, I2Indicate return light optical power, I1Indicate input light optical power, it should be apparent that, when metal tube to be measured
When the magnetic field of 4 surface of road changes, θ value will change and make return light optical power I2Size change, because
Highly sensitive photodetector in this photoelectric conversion module 8 measures return light optical power I2Size judge metallic conduit to be measured
4 whether there is defect, if the size of return light optical power changes, 4 existing defects of metallic conduit to be measured are otherwise, to be measured
Defect is not present in metallic conduit 4.
Further, optical fiber magneto-sensitive probe array 3 includes at least two optical fiber magneto-sensitive probes, and the method is also wrapped
Defect location step is included, the defect location step specifically includes following sub-step:
S11: permanent magnet 2, optical fiber magnetic susceptibility head array 3 and the three dimension location module 9 of coaxial packaging one are in oil gas
It is moved in conveying pipe, realizes the comprehensive scanning of oil and gas transportation pipeline；
S12: with the scanning along oil and gas transportation pipeline length direction, each optical fiber magnetic of optical fiber magnetic susceptibility head array 3
Sensing head exports a characteristic curve, if strong signal peak, 4 existing defects of metallic conduit to be measured, if bent occurs in curve
Line is gently then to indicate pipeline zero defect, and defect is not present in metallic conduit 4 to be measured.
S13: the output of entire optical fiber magnetic susceptibility head array 3 forms two dimensional image；
S14: permanent magnet 2, optical fiber magnetic susceptibility head array 3 and three-dimensional space of the signal processing module 10 through coaxial packaging one
The scanning speed of locating module 9, strength information obtain certain characteristic song in the two dimensional image that optical fiber magnetic susceptibility head array 3 exports
The corresponding three dimensional orientation of the defect that line is embodied and depth information.
The above specific embodiment is to this practical detailed description of the invention, and it cannot be said that a specific embodiment of the invention
It is only limited to these instructions, for those of ordinary skill in the art to which the present invention belongs, is not departing from present inventive concept
Under the premise of, several simple deductions and substitution can also be made, all shall be regarded as belonging to protection scope of the present invention.
Claims (10)
1. the metallic conduit defect location detection device based on collection magnetic surface scanning, it is characterised in that: described device includes:
Permanent magnet (2), optical fiber magneto-sensitive probe array (3), signal connection optical cable (5), sensing light source module (7) and photoelectric conversion
Module (8)；The light source of sensing light source module (7) output is transferred to optical fiber magneto-sensitive probe array through signal connection optical cable (5)
(3), optical fiber magneto-sensitive probe array (3) output return light is transferred to photoelectric conversion module (8) through signal connection optical cable (5)；
The permanent magnet (2) includes at least one first permanent magnet (21) and the second permanent magnet (22), and two permanent magnets (2) are with same
Polarity is staggered relatively, forms collection magnetic surface by the adjustment of magnet strength and distance；The optical fiber sensing probe array (3) is set to two
Between a permanent magnet (2), it is located on collection magnetic surface.
The optical fiber magneto-sensitive probe array (3) includes at least two optical fiber magneto-sensitive probes, in certain circumferential space arrangement；
Optical fiber magneto-sensitive probe includes optical fiber collimator (31), the polarizer (32), magneto-optical crystal (33), analyzer (34), reflecting mirror
(35), optical fiber collimator (31) one end connection signal connection optical cable (4), the other end is through the polarizer (32) and magneto-optical crystal
(33) one end is bonded, and magneto-optical crystal (33) other end passes through analyzer (34) composition optical transport circuit Nian Jie with reflecting mirror (35).
2. the metallic conduit defect location detection device according to claim 1 based on collection magnetic surface scanning, it is characterised in that:
Described device further includes coaxial packaging fixed beam (1), and first permanent magnet (21) and the second permanent magnet (22) are through described
Coaxial packaging fixed beam (1).
3. the metallic conduit defect location detection device according to claim 1 based on collection magnetic surface scanning, it is characterised in that:
Described device further includes fiber coupling module (6), and fiber coupling module (6) includes at least one fiber coupler.
4. the metallic conduit defect location detection device according to claim 1 based on collection magnetic surface scanning, it is characterised in that:
Described device further includes three dimension location module (9), and three dimension location module (9) includes gyroscope, acceleration transducer.
5. the metallic conduit defect location detection device according to claim 1 based on collection magnetic surface scanning, it is characterised in that:
Described device further includes signal processing module (10), and signal processing module (10) includes signal amplification circuit, multichannel A/D data
Module, embedded computer, memory module.
6. the metallic conduit defect location detection device according to claim 1 based on collection magnetic surface scanning, it is characterised in that:
The photoelectric conversion module (8) includes at least one highly sensitive photodetector, can change to Weak magentic-field and detect.
7. the metallic conduit defect location detection device according to claim 6 based on collection magnetic surface scanning, it is characterised in that:
Sensing light source module (7) output end is connect with the port a of fiber coupling module (6), the port b of fiber coupling module (6)
It is connect through signal connection optical cable (5), three dimension location module (9) with optical fiber magneto-sensitive probe array (3), fiber coupling module
(6) port c is connect with photoelectric conversion module (8) one end, and photoelectric conversion module (8) other end and signal processing module (10) are even
It connects.
8. using the detection method of device described in claim 1-7 any one, it is characterised in that: method includes that light data is received
Collect step, defect detection procedure；The light data collection step the following steps are included:
At least one first permanent magnet (21) and the second permanent magnet (22) that permanent magnet (2) includes are with same polarity formation staggered relatively
Collect magnetic surface, scans metallic conduit (4) to be measured to collect magnetic surface；
Optical fiber magneto-sensitive probe array (3) between the first permanent magnet (21) and the second permanent magnet (22) receives input light,
Input light exports return light after optical fiber collimator (31), the polarizer (32), magneto-optical crystal (33), analyzer and reflecting mirror；
The defect detection procedure the following steps are included:
The size of return light optical power is measured, if the size of return light optical power changes, metallic conduit (4) to be measured exists
Defect is not present in defect, otherwise, metallic conduit (4) to be measured.
9. the metallic conduit defect location detection method according to claim 8 based on collection magnetic surface scanning, it is characterised in that:
The specific steps of size of the measurement return light optical power include:
Return light is transferred to photoelectric conversion module (8) by signal connection optical cable (5), and photoelectric conversion module (8) measurement returns
The size of light optical power.
10. the metallic conduit defect location detection method according to claim 9 based on collection magnetic surface scanning, feature exist
In: the optical fiber magneto-sensitive probe array (3) includes at least two optical fiber magneto-sensitive probes, and the method also includes defect locations
Step, the defect location step specifically include following sub-step:
The permanent magnet (2) of coaxial packaging one, optical fiber magnetic susceptibility head array (3) and three dimension location module (9) are defeated in oil gas
It is moved in fortune pipeline, realizes the comprehensive scanning of oil and gas transportation pipeline；
With the scanning along oil and gas transportation pipeline length direction, each optical fiber magnetic susceptibility head of optical fiber magnetic susceptibility head array (3)
A characteristic curve is exported, if strong signal peak, metallic conduit (4) existing defects to be measured, if curve is occurs in curve
Gentle then indicate pipeline zero defect, defect is not present in metallic conduit (4) to be measured.
The output of entire optical fiber magnetic susceptibility head array (3) forms two dimensional image；
Permanent magnet (2), optical fiber magnetic susceptibility head array (3) and three-dimensional space of the signal processing module (10) through coaxial packaging one are fixed
The scanning speed of position module (9), strength information obtain certain characteristic in the two dimensional image of optical fiber magnetic susceptibility head array (3) output
The corresponding three dimensional orientation of the defect that curve is embodied and depth information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910133265.1A CN109839433A (en) | 2019-02-22 | 2019-02-22 | Metallic conduit defect location detection device and method based on collection magnetic surface scanning |
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| CN201910133265.1A CN109839433A (en) | 2019-02-22 | 2019-02-22 | Metallic conduit defect location detection device and method based on collection magnetic surface scanning |
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| CN201910133265.1A Pending CN109839433A (en) | 2019-02-22 | 2019-02-22 | Metallic conduit defect location detection device and method based on collection magnetic surface scanning |
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| CN113393440A (en) * | 2021-06-15 | 2021-09-14 | 电子科技大学 | Method for automatically enhancing and identifying weld defects based on magneto-optical imaging |
| CN114047249A (en) * | 2021-11-11 | 2022-02-15 | 中国计量大学 | Magnetic leakage scanning device based on optical fiber current sensing |
| CN114720553A (en) * | 2022-06-09 | 2022-07-08 | 西北大学 | Pipeline magnetic flux leakage detection device based on optical fiber coupling diamond-nitrogen vacancy color center |
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| CN114047249A (en) * | 2021-11-11 | 2022-02-15 | 中国计量大学 | Magnetic leakage scanning device based on optical fiber current sensing |
| CN114720553A (en) * | 2022-06-09 | 2022-07-08 | 西北大学 | Pipeline magnetic flux leakage detection device based on optical fiber coupling diamond-nitrogen vacancy color center |
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