CN107356664A - A kind of ferrimagnet defect detecting device based on low frequency leakage field - Google Patents
A kind of ferrimagnet defect detecting device based on low frequency leakage field Download PDFInfo
- Publication number
- CN107356664A CN107356664A CN201710682879.6A CN201710682879A CN107356664A CN 107356664 A CN107356664 A CN 107356664A CN 201710682879 A CN201710682879 A CN 201710682879A CN 107356664 A CN107356664 A CN 107356664A
- Authority
- CN
- China
- Prior art keywords
- effect sensor
- hall effect
- detection probe
- circuit
- drive module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000007547 defect Effects 0.000 title claims abstract description 28
- 238000001514 detection method Methods 0.000 claims abstract description 44
- 239000000523 sample Substances 0.000 claims abstract description 31
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 claims abstract description 9
- 230000005355 Hall effect Effects 0.000 claims description 50
- 230000005291 magnetic effect Effects 0.000 claims description 21
- 230000005284 excitation Effects 0.000 claims description 16
- 238000012545 processing Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000000694 effects Effects 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 claims description 3
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 230000001939 inductive effect Effects 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- 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 invention discloses a kind of ferrimagnet defect detecting device based on low frequency leakage field, it is characterised in that：It is made up of roller (1), detection probe (2), drive module (3), supporting construction (4), liquid crystal display systems (5), universal meter (6)；Roller (1) is connected with supporting construction (2), detection probe (2) is located at support member (4) front portion and passes through support member (4), detection probe (2) is connected with drive module (3), drive module (3) is connected with battery (5) and is placed on support member (4) rear portion, and detection probe (2) is connected by transmission line (20) with liquid crystal display systems (6).The present invention has the characteristics of simple, convenient carrying, high sensitivity, can apply the various defects of measurement ferrimagnet, and efficiently control the sensitivity of detection and cost by changing the quantity of detection probe.
Description
Technical field
The invention provides a kind of ferrimagnet defect detecting device based on low frequency leakage field, belong to Electromagnetic Testing Technology
Field.
Background technology
Ferrimagnet is a kind of conventional material in production and living, especially substantial amounts of to be applied to manufacture pressure-bearing kind equipment,
But pressure-bearing kind equipment often inevitably forms all kinds of defects in inside and outside wall.The existing detection to ferromagnetic metal material
Method such as ray detection, ultrasound detection etc. detect at the scene adaptability, testing cost, portable devices etc. have it is respective
Shortcoming, such as：Need and be detected test specimen to carry out fine ground surface coupling, so as to ultrasonic wave can detector and tested test specimen it
Between propagate；Typically it is directed to the detection of specified point, it is impossible to carry out the detection of large area region, detection efficiency is low etc..Therefore
Develop a kind of detection method that can quickly carry out large area detection and be suitable for on-line checking to be particularly important.
Low frequency Magnetic Flux Leakage Inspecting is a kind of method of electromagnetic nondestructive, is contacted without the surface with examined workpiece, to corrosion
Property damage have higher detectivity.Low frequency Magnetic Flux Leakage Inspecting technology is since 1950, and driving frequency is usually 1KHz-
500KHz, influenceed by Kelvin effect, the penetration depth of Magnetic Flux Leakage Inspecting is limited significantly, therefore Magnetic Flux Leakage Inspecting is usually used in metal
Surface and near surface detection.Low frequency leakage field overcomes the influence of Kelvin effect by reducing frequency, effectively improves 30 times of depth of detection
More than.
Based on above-mentioned background, research and development one kind can be not high to surface requirements, it is therefore desirable to has the quick, light of certain lift-off, spirit
The of a relatively high lossless detection method of sensitivity is the emphasis of current research, is advantageous to preferably prevent the failure of special equipment.
The content of the invention
It is an object of the invention to provide a kind of ferrimagnet defect detecting device based on low frequency leakage field.Present invention tool
It is easy to carry, simple in construction, easily operated, susceptibility is high, can apply to situation be present the defects of measuring ferrimagnet.
The present invention is achieved through the following technical solutions：A kind of described ferrimagnet defects detection based on low frequency leakage field
Device, it is characterised in that：By roller (1), detection probe (2), drive module (3), supporting construction (4), battery (5), liquid crystal
Display system (6) forms；Roller (1) is connected with supporting construction (2), and detection probe (2) is located at support member (4) front portion and passed through
Support member (4), detection probe (2) are connected with drive module (3), and drive module (3) is connected and placed with battery (5)
At support member (4) rear portion, detection probe (2) is connected by transmission line (20) liquid crystal with display system (6)；Detection probe (2)
By the first hall effect sensor (7), the second hall effect sensor (8), signal processing circuit (9), excitation coil (10), magnetic
Yoke (11) and probing shell (12) composition, the probing shell (12) of detection probe (2) is cylindrical shape, and excitation coil (10) is wrapped in
It is placed in yoke (11) and together among probing shell (12), signal processing circuit (9) is placed on probing shell (12) bottom,
First hall effect sensor (7) and the second hall effect sensor (8) are individually placed to the both sides of signal processing circuit (9)；Letter
Number process circuit (9) is made up of voltage conversion circuit (15) and differential amplifier circuit (16), voltage conversion circuit (15) respectively with
First hall effect sensor (7), the second hall effect sensor (8) and differential amplifier circuit (16) connection, the first Hall effect
Inductive sensing device (7) and the second hall effect sensor (8) are connected with differential amplifier circuit (16) respectively；Drive module (3) is by side
Wave generation circuit (13) and motor-drive circuit (14) form, and the square wave generation circuit (13) in drive module (3) produces one
Square-wave signal, it is connected to by motor-drive circuit (14) on excitation coil (10), under the driving of square-wave signal, excitation coil
(10) magnetic field is produced, defect can make magnetic field that leakage field phenomenon, the first hall effect sensor positioned at detection probe (2) bottom occur
(7) and due to there is range difference in the second hall effect sensor (8) so that and the first hall effect sensor (7) is located at fault location,
Second hall effect sensor (8) is located at zero defect, the first hall effect sensor (7) and the second hall effect sensor
(8) after producing two paths of signals via differential amplifier circuit (16) progress signal amplification, transmission line (20) to liquid crystal display system is passed through
Unite (6), liquid crystal display systems (6) will send alarm automatically after the magnitude of voltage of signal exceedes the threshold value of setting.
Described excitation coil (10) has a copper enameled wire composition, and the wire range of copper enameled wire is 0.1-1mm, number of turns
Scope is 200-1000 circles, and yoke (11) is manganese-zinc ferrite bar magnet, and voltage conversion circuit (15) is made up of MIC5205 chips,
Differential amplifier circuit (16) is made up of MAX4460 chips.
Described drive module (3) is made up of square wave generation circuit (13) and motor-drive circuit (14), and square wave produces electricity
Road (13) is made up of NE555 chips, and the frequency for producing square-wave signal is 20Hz, and motor-drive circuit (14) is by L298N chipsets
Into.
Described liquid crystal display systems (6) is by digital analog converter (17), middle control chip (18), LCDs (19) and passes
Defeated line (20) composition, detection probe (2) are connected by transmission line (20) with digital analog converter (17), digital analog converter (17) and
Middle control chip (18) is connected, and middle control chip (18) is connected with LCDs (19).
The present invention operation principle be：Excitation coil excites generation one under lower frequency (generally 1Hz-100Hz)
Alternating electromagnetic field is magnetized examined workpiece.After examined workpiece obtains magnetic, if do not damaged, the magnetic line of force is uniformly distributed in
In workpiece and magnetic field is not revealed, and now leakage magnetic flux is about zero.When there is damage, analyze as described above, workpiece, defect part magnetic conductance
Rate diminishes, and causes magnetic flux to be uniformly distributed, and magnetic field can not be all by the part, and now there are three paths in magnetic field, and one
To be penetrated from the recess of defect, second, still penetrated from workpiece, remaining magnetic field then outside workpiece by, leak out, into
For stray field.Stray field changes with the change of damage external form and size.So by detecting magnetic leakage signal, can with
To the typical information of defect.
The beneficial effects of the invention are as follows：Without permanent-magnet-field, weight of equipment and manipulation strength are alleviated, is easy to carry.Energy
Enough identification defect is positioned at the bottom or top of tested test specimen, improves accuracy of detection, and low to tested surface requirements.Can
Neatly to detect the ferrimagnet under different application environment by increasing detection probe quantity, inspection can be efficiently controlled
Survey sensitivity and cost, flexibility are higher.
Brief description of the drawings
Fig. 1 is a kind of ferrimagnet defect detecting device overall schematic based on low frequency leakage field；
Fig. 2 is a kind of detection probe schematic diagram of the ferrimagnet defect detecting device based on low frequency leakage field；
Fig. 3 is the defective voltage-contrast figure with during zero defect.
Embodiment
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.
Referring to accompanying drawing 1 and accompanying drawing 2, a kind of ferrimagnet defect detecting device based on low frequency leakage field, it is characterised in that：
It is made up of roller (1), detection probe (2), drive module (3), supporting construction (4), battery (5), liquid crystal display systems (6)；
Roller (1) is connected with supporting construction (2), and detection probe (2) is located at support member (4) front portion and passes through support member (4), detects
Probe (2) is connected with drive module (3), after drive module (3) is connected with battery (5) and is placed on support member (4)
Portion, detection probe (2) are connected by transmission line (20) liquid crystal with display system (6)；Detection probe (2) is passed by the first Hall effect
Sensor (7), the second hall effect sensor (8), signal processing circuit (9), excitation coil (10), yoke (11) and probing shell
(12) form, the probing shell (12) of detection probe (2) is cylindrical shape, and excitation coil (10) is wrapped in yoke (11) and together
It is placed among probing shell (12), signal processing circuit (9) is placed on probing shell (12) bottom, the first Hall effect sensing
Device (7) and the second hall effect sensor (8) are individually placed to the both sides of signal processing circuit (9)；Signal processing circuit (9) is by electricity
Voltage conversion circuit (15) and differential amplifier circuit (16) composition, voltage conversion circuit (15) respectively with the first hall effect sensor
(7), the second hall effect sensor (8) and differential amplifier circuit (16) connection, the first hall effect sensor (7) and second is suddenly
You are connected effect sensor (8) with differential amplifier circuit (16) respectively；Square wave generation circuit (13) in drive module (3) is by core
Piece NE555 produces a square-wave signal, frequency 20Hz, is connected by the motor-drive circuit (14) being made up of chip L298N
Onto excitation coil (10), under the driving of square-wave signal, excitation coil (10) produces magnetic field, and defect can make magnetic field that leakage field occur
Phenomenon, the first hall effect sensor (7) and the second hall effect sensor (8) positioned at detection probe (2) bottom are due to depositing
In range difference so that the first hall effect sensor (7) is located at fault location, and the second hall effect sensor (8) is located at zero defect
Place, the first hall effect sensor (7) and the second hall effect sensor (8) produce two paths of signals via differential amplifier circuit
(16) after carrying out signal amplification, transmit to liquid crystal display systems (6), the liquid crystal after magnitude of voltage of signal exceedes the threshold value of setting
Show that system will send alarm automatically.
Fig. 2 show a kind of detection probe schematic diagram of the ferrimagnet defect detecting device based on low frequency leakage field, such as
Shown in figure, excitation coil (10) is wrapped in yoke (11) and is placed on together among probing shell (12), signal processing circuit
(9) probing shell (12) bottom is placed on, the first hall effect sensor (7) and the second hall effect sensor (8) are put respectively
In the both sides of signal processing circuit (9)；Signal processing circuit (9) is by voltage conversion circuit (15) and differential amplifier circuit (16) group
Into voltage conversion circuit (15) is put with the first hall effect sensor (7), the second hall effect sensor (8) and difference respectively
Big circuit (16) connection, the first hall effect sensor (7) and the second hall effect sensor (8) respectively with differential amplifier circuit
(16) connect.First hall effect sensor (7) and the second hall effect sensor (8) all select A1389LLHLT-9-T, swash
The copper enameled wire that coil (10) is 0.49 millimeter of line footpath is encouraged, number of turns is 500 circles, and yoke (11) is manganese-zinc ferrite bar magnet,
The chip that voltage conversion circuit (15) is selected is MIC5205, can use the DC voltage that 12V DC voltage conversion is 5V
Powered in the first hall effect sensor (7), the second hall effect sensor (8) and differential amplifier circuit (16).Difference is put
Big circuit (16) is MAX4460 from chip, and the first hall effect sensor (7) and the second hall effect sensor (8) pass
After the two paths of signals that output comes carries out signal amplification by differential amplifier circuit (16), output signal is transmitted to digital analog converter
(17) in, data signal is converted analog signals into, and by middle control chip (18), signal is shown to LCDs (19)
On, after signal value exceedes given threshold, device can alarm, so as to remind operating personnel defective herein.Digital analog converter
(17) 1602 liquid crystal is selected from chip AD7705, middle control chip (18) selection chip STC89C51, LCDs (19)
Screen.
As shown in figure 3, when zero defect, the magnitude of voltage shown on the LCDs (19) of device is 0.04V；It is scarce when having
When falling into, the magnitude of voltage shown on the LCDs (19) of device is 1.86V.By contrast this it appears that the present invention have it is bright
Aobvious test effect.
Claims (4)
- A kind of 1. ferrimagnet defect detecting device based on low frequency leakage field, it is characterised in that：By ball (1), detection probe (2), drive module (3), supporting construction (4), battery (5), liquid crystal display systems (6) composition；Roller (1) and supporting construction (2) it is connected, detection probe (2) is located at support member (4) front portion and passes through support member (4), detection probe (2) and drive module (3) it is connected, drive module (3) is connected with battery (5) and is placed on support member (4) rear portion, and detection probe (2) passes through Transmission line (20) is connected with liquid crystal display systems (6)；Detection probe (2) is imitated by the first hall effect sensor (7), the second Hall Inductive sensing device (8), signal processing circuit (9), excitation coil (10), yoke (11) and probing shell (12) composition, detection probe (2) probing shell (12) is cylindrical shape, and excitation coil (10) is wrapped in yoke (11) and is placed on probing shell together (12) among, signal processing circuit (9) is placed on probing shell (12) bottom, and the first hall effect sensor (7) and second is suddenly Your effect sensor (8) is individually placed to the both sides of signal processing circuit (9)；Signal processing circuit (9) is by voltage conversion circuit (15) with differential amplifier circuit (16) form, voltage conversion circuit (15) respectively with the first hall effect sensor (7), second suddenly That effect sensor (8) and differential amplifier circuit (16) connection, the first hall effect sensor (7) and the second Hall effect sensing Device (8) is connected with differential amplifier circuit (16) respectively；Drive module (3) is by square wave generation circuit (13) and motor-drive circuit (14) form, the square wave generation circuit (13) in drive module (3) produces a square-wave signal, by motor-drive circuit (14) It is connected on excitation coil (10), under the driving of square-wave signal, excitation coil (10) produces magnetic field, and defect can make magnetic field Leakage field phenomenon, positioned at detection probe (2) bottom the first hall effect sensor (7) and the second hall effect sensor (8) by In range difference being present so that the first hall effect sensor (7) is located at fault location, and the second hall effect sensor (8) is located at nothing Fault location, the first hall effect sensor (7) and the second hall effect sensor (8) produce two paths of signals via differential amplification electricity After road (16) carries out signal amplification, by transmission line (20) to liquid crystal display systems (6), when the magnitude of voltage of signal exceedes setting Liquid crystal display systems (6) will send alarm automatically after threshold value.
- A kind of 2. ferrimagnet defect detecting device based on low frequency leakage field according to claim 1, it is characterised in that： Excitation coil (10) has copper enameled wire composition, and the wire range of copper enameled wire is 0.1-1mm, and number of turns scope is 200-1000 Circle, yoke (11) are manganese-zinc ferrite bar magnet, and voltage conversion circuit (15) is made up of MIC5205 chips, differential amplifier circuit (16) it is made up of MAX4460 chips.
- A kind of 3. ferrimagnet defect detecting device based on low frequency leakage field according to claim 1, it is characterised in that： Drive module (3) is made up of square wave generation circuit (13) and motor-drive circuit (14), and square wave generation circuit (13) is by NE555 cores Piece forms, and the frequency for producing square-wave signal is 20Hz, and motor-drive circuit (14) is made up of L298N chips.
- 4. a kind of ferrimagnet defect detecting device based on low frequency leakage field according to claim 1, liquid crystal display system System (6) is made up of digital analog converter (17), middle control chip (18), LCDs (19) and transmission line (20), detection probe (2) It is connected by transmission line (20) with digital analog converter (17), digital analog converter (17) is connected with middle control chip (18), middle control Chip (18) is connected with LCDs (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710682879.6A CN107356664A (en) | 2017-08-04 | 2017-08-04 | A kind of ferrimagnet defect detecting device based on low frequency leakage field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710682879.6A CN107356664A (en) | 2017-08-04 | 2017-08-04 | A kind of ferrimagnet defect detecting device based on low frequency leakage field |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107356664A true CN107356664A (en) | 2017-11-17 |
Family
ID=60287284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710682879.6A Pending CN107356664A (en) | 2017-08-04 | 2017-08-04 | A kind of ferrimagnet defect detecting device based on low frequency leakage field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107356664A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108205011A (en) * | 2018-03-06 | 2018-06-26 | 中国计量大学 | Flaw detection circuit inside a kind of ferrimagnet based on low frequency leakage field |
| CN108982659A (en) * | 2018-10-08 | 2018-12-11 | 中国计量大学 | A kind of full-automatic defect detecting device based on low frequency electromagnetic |
| CN108982651A (en) * | 2018-08-09 | 2018-12-11 | 苏州热工研究院有限公司 | Exchange leakage field sensor based on ferromagnetic butt plates welding seam crack detection and the method using its progress crack detection |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995432A (en) * | 2010-11-04 | 2011-03-30 | 重庆大学 | Hall element differential array based ferromagnetic construction member surface crack detector |
| CN103645243A (en) * | 2013-11-28 | 2014-03-19 | 南京航空航天大学 | Electromagnetic nondestructive detection system of power transmission line |
| CN204065016U (en) * | 2014-08-26 | 2014-12-31 | 湘潭宏远电子科技有限公司 | A kind of ferromagnetic tubes inner wall corrosion the cannot-harm-detection device |
| CN106124612A (en) * | 2016-06-28 | 2016-11-16 | 中国计量大学 | A kind of Portable ferromagnetic fault in material based on low frequency electromagnetic detection device |
| CN106370723A (en) * | 2016-11-14 | 2017-02-01 | 中国计量大学 | Special metal equipment damage detection system based on low-frequency eddy current |
-
2017
- 2017-08-04 CN CN201710682879.6A patent/CN107356664A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995432A (en) * | 2010-11-04 | 2011-03-30 | 重庆大学 | Hall element differential array based ferromagnetic construction member surface crack detector |
| CN103645243A (en) * | 2013-11-28 | 2014-03-19 | 南京航空航天大学 | Electromagnetic nondestructive detection system of power transmission line |
| CN204065016U (en) * | 2014-08-26 | 2014-12-31 | 湘潭宏远电子科技有限公司 | A kind of ferromagnetic tubes inner wall corrosion the cannot-harm-detection device |
| CN106124612A (en) * | 2016-06-28 | 2016-11-16 | 中国计量大学 | A kind of Portable ferromagnetic fault in material based on low frequency electromagnetic detection device |
| CN106370723A (en) * | 2016-11-14 | 2017-02-01 | 中国计量大学 | Special metal equipment damage detection system based on low-frequency eddy current |
Non-Patent Citations (1)
| Title |
|---|
| 严新平 等: "机械系统工况监测与故障诊断", 武汉理工大学出版社, pages: 211 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108205011A (en) * | 2018-03-06 | 2018-06-26 | 中国计量大学 | Flaw detection circuit inside a kind of ferrimagnet based on low frequency leakage field |
| CN108205011B (en) * | 2018-03-06 | 2023-06-20 | 中国计量大学 | Ferromagnetic material internal flaw detection circuit based on low-frequency magnetic leakage |
| CN108982651A (en) * | 2018-08-09 | 2018-12-11 | 苏州热工研究院有限公司 | Exchange leakage field sensor based on ferromagnetic butt plates welding seam crack detection and the method using its progress crack detection |
| CN108982659A (en) * | 2018-10-08 | 2018-12-11 | 中国计量大学 | A kind of full-automatic defect detecting device based on low frequency electromagnetic |
| CN108982659B (en) * | 2018-10-08 | 2024-05-31 | 中国计量大学 | Full-automatic defect detection device based on low-frequency electromagnetism |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103499404B (en) | Ferromagnetic component alterante stress measurement mechanism and measuring method thereof | |
| CN102759567B (en) | The EDDY CURRENT identification of steel pipe inside and outside wall defect and evaluation method under DC magnetization | |
| CN109765292B (en) | Accurate positioning method for pipeline defects | |
| CN103235036B (en) | Based on pick-up unit and the method for the differentiation inside and outside wall defect of electromagnetic detection signal | |
| CN206489114U (en) | The sensor and system of type multimode electromagnetic ultrasound and Magnetic Flux Leakage Inspecting | |
| CN105353030A (en) | Low-frequency electromagnetism-based defect detecting device | |
| CN109358110A (en) | A kind of array electromagnetism various dimensions detection system for the imaging of steel plate internal flaw | |
| Ru et al. | Structural coupled electromagnetic sensing of defects diagnostic system | |
| CN103499636A (en) | Method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force | |
| CN107356664A (en) | A kind of ferrimagnet defect detecting device based on low frequency leakage field | |
| CN201051089Y (en) | A real time multi-channel whirlpool and magnetic memory/magnetism leakage detection device | |
| CN102879462A (en) | Metal defect eddy current detection device and probe thereof | |
| CN104833720A (en) | Method for single-coil electromagnetic resonance detection of metal pipeline damage | |
| CN105548349A (en) | Rectangular probe pulsed eddy current detecting method for realizing defect reconstruction technology | |
| CN111929356B (en) | Steel defect magnetic imaging device and method | |
| CN209264626U (en) | A kind of array electromagnetism various dimensions detection system for the imaging of steel plate internal flaw | |
| CN102087245B (en) | Amorphous alloy based electromagnetic detection sensor | |
| CN207163970U (en) | A kind of ferrimagnet defect detecting device based on low frequency leakage field | |
| CN204613151U (en) | A kind of compressed natural gas storage well the cannot-harm-detection device | |
| WO2011138993A1 (en) | Complex nondestructive inspection device using a hybrid inductive magnetic thin film sensor | |
| CN207908434U (en) | A kind of multifunctional combination probe for pipeline detection | |
| CN104391036A (en) | Gas storage well hole diameter defect detection method | |
| CN106404900A (en) | Device for detecting steel plate surface defect | |
| CN109884175A (en) | A kind of metal pipeline flaw detection device of low frequency electromagnetic combination magnetic powder | |
| CN206161591U (en) | Steel sheet surface defect detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171117 |