CN108008005A - A kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor - Google Patents
A kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor Download PDFInfo
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- CN108008005A CN108008005A CN201711458942.4A CN201711458942A CN108008005A CN 108008005 A CN108008005 A CN 108008005A CN 201711458942 A CN201711458942 A CN 201711458942A CN 108008005 A CN108008005 A CN 108008005A
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- 238000001514 detection method Methods 0.000 title claims abstract description 50
- 230000007547 defect Effects 0.000 title claims abstract description 34
- 230000005284 excitation Effects 0.000 claims abstract description 14
- 230000004936 stimulating effect Effects 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- NMWSKOLWZZWHPL-UHFFFAOYSA-N 3-chlorobiphenyl Chemical compound ClC1=CC=CC(C=2C=CC=CC=2)=C1 NMWSKOLWZZWHPL-UHFFFAOYSA-N 0.000 description 2
- 101001082832 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) Pyruvate carboxylase 2 Proteins 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
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- 238000005260 corrosion Methods 0.000 description 2
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- 238000011156 evaluation Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
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- 238000005859 coupling reaction Methods 0.000 description 1
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- 230000008030 elimination Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 230000005307 ferromagnetism Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
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- 238000007689 inspection Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
The present invention discloses a kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor, and the metallic conduit defects detection low frequency electromagnetic flexible array sensor includes：The metallic conduit defects detection low frequency electromagnetic flexible array sensor includes：Elastic supporting pipe and flexible PCB；The elastic supporting pipe is hollow structure, and the flexible PCB is bonded on the elastic supporting pipe excircle；The flexible PCB is equipped with low-frequency coil excitation and sensor array, and the sensor array is arranged on the low-frequency coil excitation top；The sensor array includes multiple differential coils, and the differential coil is made of two coils；The low-frequency coil excitation is in a ring.The low frequency electromagnetic flexible array sensor of the present invention includes multiple electromagnetic coils, the defects of can realizing all directions on metal pipe-wall, is detected, the distributed intelligence of defect in different directions is obtained, the interference between coil can be eliminated, improve detection efficiency and sensitivity.
Description
Technical field
The present invention relates to sensor field, more particularly to a kind of metallic conduit defects detection low frequency electromagnetic flexible array
Sensor.
Background technology
Stress metal pipeline is a kind of pressure-bearing class special equipment, its working environment is sufficiently complex, often subjects high temperature, height
Pressure, low temperature, inflammable and explosive, poisonous or corrosive medium comprehensive function, have the potential danger leaked and explode.Its stress
Component is generally using nonferromugnetic materials such as ferromagnetism or stainless steels, and metal material is in use, stress, medium and temperature
Degree etc. operation operating mode under can cause material corrosion, wash away be thinned and cracking equivalent damage, therefore, to live metallic conduit without into
It is used for quickly detecting in the case of the polishing cleaning of row surface significant with efficient diagnosis.In the main damage pattern of metallic conduit
In research, it is one of main damage mode for influencing bearing device long period safe operation that material corrosion, which is thinned,.Therefore, corrode
Detection is one in pressure pipeline detection and predominantly detects means, and pressure pipeline carries out REASON ANALYSIS ON WELDING SEAM and service life
One the key technical indexes of assessment.
In current defect inspection, the detection method such as Magnetic testing, ray detection, ultrasound detection extensively should
With, but consider from detection sensitivity, equipment cost, detection efficiency, accuracy of detection etc., low frequency electromagnetic detection method has
Its detection efficiency is high, and live ancillary works is few, the advantages such as testing cost is low.For the test problems of defect of pipeline, traditional electricity
Magnetic measurement sensor uses unicoil mostly, can only single-point scanning, to larger area carry out all standing detection it is then very time-consuming
Arduously, and it is easy to that detection leakage phenomenon occurs.So development it is a kind of by Kelvin effect and sweep speed influenced it is small, can large area sweep
Look into, high accuracy, highly sensitive low frequency electromagnetic sensor array, be of great significance to the detection for solving metallic conduit defect.
The content of the invention
The object of the present invention is to provide a kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor, improves pipe
The accuracy and sensitivity of road defects detection.
To achieve the above object, the present invention provides following scheme：
The present invention provides a kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor, the metallic conduit
Defects detection low frequency electromagnetic flexible array sensor includes：Elastic supporting pipe and flexible PCB；The elastic supporting pipe is
Hollow structure, the flexible PCB are bonded on the elastic supporting pipe excircle；
The flexible PCB is equipped with low-frequency coil excitation and sensor array, and the sensor array is arranged on described
Low-frequency coil excitation top；The sensor array includes multiple differential coils, and the differential coil is made of two coils；Institute
State low-frequency coil excitation in a ring.
Optionally, the sensor array includes 16 coils, 16 rectangular arrangements of coil.
Optionally, CPU, signal generator, power circuit and protection circuit are additionally provided with the flexible PCB, it is described
CPU connects the low-frequency coil excitation, the sensor array, the signal generator, the power circuit, the guarantor respectively
Protection circuit, the exterior host computer of the CPU connections.
Optionally, the resilient support inside pipe wall is equipped with silica gel ring, and the elastic supporting pipe is hollow structure, the bullet
Property support tube cavity be equipped with compressing gasbag, the compressing gasbag passes through micro air pump outside tracheae connection.
Optionally, the elastic supporting pipe passes through flexible PCB described in clamp connection；The clip passes through the clamping that is buckled.
Optionally, the clip is chain-type.
Optionally, the CPU uses the microcontroller of model N76E003.
The specific embodiment provided according to the present invention, the invention discloses following technique effect：
The metallic conduit defects detection of the present invention uses multiple differential coils with low frequency electromagnetic flexible array sensor, can
The defects of realizing all directions on metal pipe-wall is detected, and obtains the distributed intelligence of defect in different directions, can eliminate coil
Between interference, improve detection efficiency and sensitivity.
The resilient support tube cavity of the present invention is equipped with compressing gasbag, and compressing gasbag connects exterior micro air pump by tracheae,
It can realize and resilient support pipe size is adjusted, the convenient pipeline for detecting different-diameter.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the structural representation of the embodiment of metallic conduit defects detection low frequency electromagnetic flexible array sensor of the present invention
Scheme (top view)；
Fig. 2 is the structure diagram of low-frequency coil excitation and sensor array plate on flexible circuit of the present invention；
Fig. 3 is the top view of the clip of the present invention；
Fig. 4 is the circuit structure connection figure of metallic conduit defects detection low frequency electromagnetic flexible array sensor of the present invention.
Embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment, belongs to the scope of protection of the invention.
The object of the present invention is to provide a kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor, improves pipe
The accuracy and sensitivity of road defects detection.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
The present invention provides a kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor, Fig. 1 is the present invention
The structure diagram of the metallic conduit defects detection embodiment of low frequency electromagnetic flexible array sensor.As shown in Figure 1, the gold
Metal conduit defects detection low frequency electromagnetic flexible array sensor includes：Elastic supporting pipe 1, flexible PCB 2 and clip 13, institute
State flexible PCB 2 to be bonded on 1 excircle of elastic supporting pipe, and elastic supporting pipe 1 connects flexible PCB by clip 13
2, the clip 13 is by 14 clampings that are buckled, and clip 13 uses chain type hoop, easy to removing and installing for elastic supporting pipe 1；It is soft
Property circuit board 2 be equipped with low-frequency coil excitation 3, sensor array 4, CPU5, signal generator 6, power circuit 7, protection circuit
8, the CPU5 connect low-frequency coil excitation 3, sensor array 4, signal generator 6, power circuit 7, protection circuit 8 respectively,
The exterior host computer 9 of the CPU5 connections.
Circuit 8 is protected to protect the component in electronic circuit when overvoltage, overcurrent, surge, electromagnetic interference is subject to
It is without damage.
Low-frequency coil excitation 3 is distributed in a ring, the arrangement of 4 rectangular shape of sensor array, and sensor array 4 be arranged on it is low
The top of frequency coil stimulating 3；Sensor array 4 uses array coil set of pieces；4 number of coils of sensor array sets 16.
In practical work process, capacitive coupling produces interference between excitation coil and detection coil, i.e., produces interference to eddy current signal.This
16 coils of invention form 8 groups of differential coils, adjacent coil difference two-by-two；Sensor differential setting can effectively reduce dry
Disturb.Using this structure, the interference between coil can be eliminated；It can be used in the proximity measurement on large-area metal surface, detection
The position of component, surface topography, the internal-and external diameter etc. of coating layer thickness and revolving parts, may also be used for the surfaces such as detection crackle
Defect.
The scope of low frequency of the present invention is as follows：For ferrimagnet (such as carbon steel), frequency is no more than 30HZ；For non-ferric
Magnetic material (such as 304 stainless steels), frequency are no more than 1000HZ.
The present invention is encouraged using low-frequency ac, and compared with direct current Magnetic Flux Leakage Inspecting, low frequency Analysis of Magnetic Flux Leakage Testing Signals can be used for damaging
The information of wound evaluation is more rich, and the information such as its amplitude, phase and frequency is used equally for Damage Evaluation.
In the present invention, 1 inner wall of elastic supporting pipe is equipped with silica gel ring, and elastic supporting pipe 1 is hollow structure, elastic supporting pipe
1 inner cavity is equipped with compressing gasbag 10, and compressing gasbag 10 connects exterior micro air pump 12 by tracheae 11；Using this structure, Neng Goushi
Now resilient support pipe size is adjusted, the convenient pipeline for detecting different-diameter.
In the present invention, CPU5 uses the microcontroller of model N76E003, and N76E003 may operate at two kinds of low-power consumption moulds
Formula-idle pulley and power-down mode, can select which kind of pattern operated in by software.During idle pulley, chip master clock closes
Close, but partial function module is still run.Chip whole clock, which is closed, under power-down mode ensures that chip power-consumption reaches minimum.Just
Under normal operating mode, master clock frequency elimination mode also may be selected and work, it is ensured that flexibly used between power consumption and performance.High-effect,
Abundant function module and configuration, N76E003 can flexibly be used for various application scenarios.
The application method of the present invention comprises the following steps：
A, elastic supporting pipe is placed on inner cavity of pipe to be detected；
B, start micro air pump afterwards, compressing gasbag is inflated, until flexible circuit plate surface fitting inner-walls of duct,
Close micro air pump；
C, startup power supply, applies low frequency ac to coil and flows into row energization；Due to by the way of ac-excited, coil
The magnetizing field of middle generation can produce Kelvin effect, and the top layer of test specimen is will focus on by magnetizing the magnetic field produced later；
D, low-frequency exciting current causes the penetration depth in magnetic field to increase, when sensor is moved to defective place, magnetic force
Line can be distorted, so as to overflow to form stray field in fault location；
E, the sensor array of the arrangement above low-frequency coil excitation is made of 16 coils, plays detection；
F. by analyzing received electromagnetic field signal, the relevant information of defect can be obtained, and be reflected in calculating
On machine.
The present invention using low-frequency ac due to being encouraged so that penetration depth increase, detection depth increase.In the signal of acquisition
In information, not only there is conventional amplitude information, also have phase information.Exactly because and the increase of signal parameter, to a certain degree
On improve the reliability and precision of detection.Meanwhile the present invention be based on low frequency electromagnetic detection method, and use sensor array into
Row detection, solves the problems, such as leakage field, eddy current sensor detection spatial resolution is low and sensitivity is not high.
Specific case used herein is set forth the principle of the present invention and embodiment, and above example is said
It is bright to be only intended to help the method and its core concept for understanding the present invention；Meanwhile for those of ordinary skill in the art, foundation
The thought of the present invention, in specific embodiments and applications there will be changes.In conclusion this specification content is not
It is interpreted as limitation of the present invention.
Claims (7)
1. a kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor, it is characterised in that the metallic conduit lacks
Falling into detection low frequency electromagnetic flexible array sensor includes：Elastic supporting pipe and flexible PCB；During the elastic supporting pipe is
Hollow structure, the flexible PCB are bonded on the elastic supporting pipe excircle；
The flexible PCB is equipped with low-frequency coil excitation and sensor array, the sensor array are arranged on the low frequency
Above coil stimulating；The sensor array includes multiple differential coils, and the differential coil is made of two coils；It is described low
Frequency coil stimulating is in a ring.
2. metallic conduit defects detection according to claim 1 low frequency electromagnetic flexible array sensor, it is characterised in that
The sensor array includes 16 coils, 16 rectangular arrangements of coil.
3. metallic conduit defects detection according to claim 1 low frequency electromagnetic flexible array sensor, it is characterised in that
CPU, signal generator, power circuit and protection circuit are additionally provided with the flexible PCB, the CPU connects described low respectively
Frequency coil stimulating, the sensor array, the signal generator, the power circuit, the protection circuit, the CPU connect
Connect exterior host computer.
4. metallic conduit defects detection according to claim 1 low frequency electromagnetic flexible array sensor, it is characterised in that
The resilient support inside pipe wall is equipped with silica gel ring, and the elastic supporting pipe is hollow structure, and the resilient support tube cavity is set
There is compressing gasbag, the compressing gasbag connects exterior micro air pump by tracheae.
5. metallic conduit defects detection according to claim 1 low frequency electromagnetic flexible array sensor, it is characterised in that
The elastic supporting pipe passes through flexible PCB described in clamp connection；The clip passes through the clamping that is buckled.
6. metallic conduit defects detection according to claim 5 low frequency electromagnetic flexible array sensor, it is characterised in that
The clip is chain-type.
7. metallic conduit defects detection according to claim 1 low frequency electromagnetic flexible array sensor, it is characterised in that
The CPU uses the microcontroller of model N76E003.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711458942.4A CN108008005A (en) | 2017-12-28 | 2017-12-28 | A kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711458942.4A CN108008005A (en) | 2017-12-28 | 2017-12-28 | A kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor |
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| CN108008005A true CN108008005A (en) | 2018-05-08 |
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| CN201711458942.4A Pending CN108008005A (en) | 2017-12-28 | 2017-12-28 | A kind of metallic conduit defects detection low frequency electromagnetic flexible array sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111076805A (en) * | 2019-12-18 | 2020-04-28 | 天津大学 | Full-flexible electromagnetic vibration sensor based on folding film |
| CN111220710A (en) * | 2019-11-07 | 2020-06-02 | 中国石油天然气集团公司管材研究所 | Pipeline stripping monitoring system and monitoring method |
| CN112888940A (en) * | 2018-08-08 | 2021-06-01 | 蓬勃科技有限公司 | Method and device for detecting defects of metal pipeline |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261246A (en) * | 2007-03-09 | 2008-09-10 | 清华大学 | Pipeline crack far-field vortex checking method |
| CN204255905U (en) * | 2014-12-12 | 2015-04-08 | 中国人民解放军国防科学技术大学 | For the array eddy current sensor of metal pipe internal wall defects detection |
| CN105784839A (en) * | 2016-03-18 | 2016-07-20 | 中国计量学院 | Method for detecting micro-defects on surfaces of metal container |
| CN205958517U (en) * | 2016-08-17 | 2017-02-15 | 秦文婷 | Low frequency electromagnetic testing system |
| CN106442707A (en) * | 2016-12-14 | 2017-02-22 | 中国计量大学 | Metal pipeline defect detecting device based on low-frequency electromagnetism |
| CN106501355A (en) * | 2016-12-14 | 2017-03-15 | 中国计量大学 | A kind of metallic conduit defect detecting device based on far-field eddy |
-
2017
- 2017-12-28 CN CN201711458942.4A patent/CN108008005A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261246A (en) * | 2007-03-09 | 2008-09-10 | 清华大学 | Pipeline crack far-field vortex checking method |
| CN204255905U (en) * | 2014-12-12 | 2015-04-08 | 中国人民解放军国防科学技术大学 | For the array eddy current sensor of metal pipe internal wall defects detection |
| CN105784839A (en) * | 2016-03-18 | 2016-07-20 | 中国计量学院 | Method for detecting micro-defects on surfaces of metal container |
| CN205958517U (en) * | 2016-08-17 | 2017-02-15 | 秦文婷 | Low frequency electromagnetic testing system |
| CN106442707A (en) * | 2016-12-14 | 2017-02-22 | 中国计量大学 | Metal pipeline defect detecting device based on low-frequency electromagnetism |
| CN106501355A (en) * | 2016-12-14 | 2017-03-15 | 中国计量大学 | A kind of metallic conduit defect detecting device based on far-field eddy |
Non-Patent Citations (1)
| Title |
|---|
| 沈功田等, 中国质检出版社, pages: 448 - 454 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112888940A (en) * | 2018-08-08 | 2021-06-01 | 蓬勃科技有限公司 | Method and device for detecting defects of metal pipeline |
| CN111220710A (en) * | 2019-11-07 | 2020-06-02 | 中国石油天然气集团公司管材研究所 | Pipeline stripping monitoring system and monitoring method |
| CN111220710B (en) * | 2019-11-07 | 2023-09-08 | 中国石油天然气集团公司管材研究所 | Pipeline stripping monitoring system and monitoring method |
| CN111076805A (en) * | 2019-12-18 | 2020-04-28 | 天津大学 | Full-flexible electromagnetic vibration sensor based on folding film |
| CN111076805B (en) * | 2019-12-18 | 2021-09-24 | 天津大学 | Full-flexible electromagnetic vibration sensor based on folding film |
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