JPS5730943A - Detecting method for defect in ferromagnetic material - Google Patents
Detecting method for defect in ferromagnetic materialInfo
- Publication number
- JPS5730943A JPS5730943A JP10646780A JP10646780A JPS5730943A JP S5730943 A JPS5730943 A JP S5730943A JP 10646780 A JP10646780 A JP 10646780A JP 10646780 A JP10646780 A JP 10646780A JP S5730943 A JPS5730943 A JP S5730943A
- Authority
- JP
- Japan
- Prior art keywords
- defective part
- ferromagnetic material
- inspected
- poles
- magnetic sensor
- 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
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
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
PURPOSE:To enable a rapid and reliable detection of a defective part generated in a ferromagnetic material, by a method wherein a defect detecting probe, in which a magnetic sensor is adhered to one magnetic pole of a magnet, is brought into contact with an object to be inspected. CONSTITUTION:A detecting part is moved in a state that a space between poles, appearing at the end surfaces of ferromagnetic substances 5, 5', which is magnetically closely adhered to a magnet 3, and poles, positioned facing confrontedly to said poles and appearing at a surface of an object 1 to be inspected, is spaced at a given interval by means of a spacer 6, and as a result, a density of magnetic flux at a defective part 2 decreases as compared with that of a nondefective part. The change in density is detected by means of a bridge circuit, in which a magnetic sensor 4 adhered to the interposing substance 5 and a compensating magnetic sensor 4' positioned in a nonmagnetic field state are connected together, to detect the presence of a defective part in the object to be inspected. This permits the reliable and easy detection of the position and size of the defective part in a ferromagnetic material, and besides, permits detection of the defective part in accordance with the shape of the ferromagnetic material.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10646780A JPS5730943A (en) | 1980-08-04 | 1980-08-04 | Detecting method for defect in ferromagnetic material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10646780A JPS5730943A (en) | 1980-08-04 | 1980-08-04 | Detecting method for defect in ferromagnetic material |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5730943A true JPS5730943A (en) | 1982-02-19 |
Family
ID=14434349
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10646780A Pending JPS5730943A (en) | 1980-08-04 | 1980-08-04 | Detecting method for defect in ferromagnetic material |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5730943A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0266103A2 (en) * | 1986-10-31 | 1988-05-04 | Electric Power Research Institute, Inc | Magnetic flux leakage probe for use in nondestructive testing |
US6150809A (en) * | 1996-09-20 | 2000-11-21 | Tpl, Inc. | Giant magnetorestive sensors and sensor arrays for detection and imaging of anomalies in conductive materials |
US7176681B2 (en) | 2005-03-08 | 2007-02-13 | Siemens Power Generation, Inc. | Inspection of composite components using magnetic resonance imaging |
WO2015140220A1 (en) * | 2014-03-18 | 2015-09-24 | Sensitec Gmbh | Magnetic field sensor arrangement |
WO2019107575A1 (en) * | 2017-12-01 | 2019-06-06 | 住友化学株式会社 | Defect measurement device, defect measurement method, and inspection probe |
-
1980
- 1980-08-04 JP JP10646780A patent/JPS5730943A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0266103A2 (en) * | 1986-10-31 | 1988-05-04 | Electric Power Research Institute, Inc | Magnetic flux leakage probe for use in nondestructive testing |
US6150809A (en) * | 1996-09-20 | 2000-11-21 | Tpl, Inc. | Giant magnetorestive sensors and sensor arrays for detection and imaging of anomalies in conductive materials |
US7176681B2 (en) | 2005-03-08 | 2007-02-13 | Siemens Power Generation, Inc. | Inspection of composite components using magnetic resonance imaging |
WO2015140220A1 (en) * | 2014-03-18 | 2015-09-24 | Sensitec Gmbh | Magnetic field sensor arrangement |
WO2019107575A1 (en) * | 2017-12-01 | 2019-06-06 | 住友化学株式会社 | Defect measurement device, defect measurement method, and inspection probe |
JP2019100850A (en) * | 2017-12-01 | 2019-06-24 | 住友化学株式会社 | Defect measuring apparatus, defect measuring method, and inspection probe |
CN111417851A (en) * | 2017-12-01 | 2020-07-14 | 住友化学株式会社 | Defect measuring device, defect measuring method, and inspection probe |
US11821870B2 (en) | 2017-12-01 | 2023-11-21 | Sumitomo Chemical Company, Limited | Defect measurement device, defect measurement method, and inspection probe |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4814705A (en) | Method and apparatus for magnetic discontinuity detection in a specimen of magnetizable material | |
KR100671630B1 (en) | On-line flaw detection method of magnetic leak detector and strip of magnetic flaw detector | |
JPS5730943A (en) | Detecting method for defect in ferromagnetic material | |
JPS55101044A (en) | Flaw detector | |
Kreutzbruck et al. | Adapted gmr array used in magnetic flux leakage inspection | |
JPH04296648A (en) | Method and device for magnetic crack detection | |
JPS61161659U (en) | ||
JPS6421348A (en) | Leakage magnetism flaw detection | |
JPS5757204A (en) | Method of measuring thickness of film formed on surface of ferromagnetic substance | |
JPS6483154A (en) | Current sensor | |
JPS6469946A (en) | Automatic magnetic flaw detector | |
RU2189583C2 (en) | Pyroelectromagnetic method of nondestructive test | |
Nakamura et al. | Optimization of magnetic-field component detection for unsaturated AC magnetic-flux-leakage testing to detect cracks in steel | |
JPS57161631A (en) | Detecting device for surface stress | |
JPS55129747A (en) | Damage detection and measuring method for terminal part of steel wire | |
JPH05172786A (en) | Leakage flux detector | |
SU1390583A2 (en) | Device for detecting magnetic stray fields | |
SU1413513A1 (en) | Method of magnetographic inspection of articles of ferromagnetic materials | |
JPS5651681A (en) | Measuring instrument for magnetic characteristic | |
JPH02236446A (en) | Method and device for detecting flaw by leaked magnetic flux | |
SU822088A1 (en) | Method of measuring magnetic field intensity in local specimen region | |
SU1188627A1 (en) | Method of magnetic-tape inspection of lengthwise joints of ferromagnetic tubes | |
SU1140032A1 (en) | Method of checking physical properties of ferromagnetic articles | |
JPS5689053A (en) | Electromagnetic ultrasonic inspector | |
JPS60147648A (en) | Method and device for flaw detection |