JPS56141553A - Discriminating method for signal in eddy current flaw detection - Google Patents
Discriminating method for signal in eddy current flaw detectionInfo
- Publication number
- JPS56141553A JPS56141553A JP4592980A JP4592980A JPS56141553A JP S56141553 A JPS56141553 A JP S56141553A JP 4592980 A JP4592980 A JP 4592980A JP 4592980 A JP4592980 A JP 4592980A JP S56141553 A JPS56141553 A JP S56141553A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- phase
- flaw
- numerical value
- eddy current
- 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
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9046—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents by analysing electrical signals
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 discriminate noise and flaw signals easily and accurately by detecting eddy current flaw detection signals at different phase angles, forming a signal locus pattern in the prescribed phase angle directions and decoding the form numerical value relating to form characteristics. CONSTITUTION:Phase detectors 2, 4 respectively detect the specific signals for the eddy current flaw detection from a detecting part 1 via phase shifters 3, 5 differing in phase by 90 deg. from that of an oscillator 13 and applies these to an operating part 6 of pattern form numerical value via A/D converters 9, 10, etc. Then, the arithmetic part 6 synthesizes the detection output components of orthogonal two axes X, Y differing in phase by 90 deg. to operate and calculate peculiar signal locus patterns B or B', etc. thereby determining the angle alpha etc. of the form numerical value corresponding to the pattern B determined by the prescribed constant K by converted orthogonal axes X', Y' or the intermediate value of B'. This angle alpha is compared with the set value having beforehand been operated and determined by a knows flaw etc., and depending upon whether it is below or above the determined value, the flaw signal and noise signal are discriminated by the form numerical value in the prescribed same phase angle direction, whereby the flaw signal and noise signal are discriminated easily and accurately.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4592980A JPS56141553A (en) | 1980-04-07 | 1980-04-07 | Discriminating method for signal in eddy current flaw detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4592980A JPS56141553A (en) | 1980-04-07 | 1980-04-07 | Discriminating method for signal in eddy current flaw detection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS56141553A true JPS56141553A (en) | 1981-11-05 |
Family
ID=12732943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4592980A Pending JPS56141553A (en) | 1980-04-07 | 1980-04-07 | Discriminating method for signal in eddy current flaw detection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56141553A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0107844A2 (en) * | 1982-10-21 | 1984-05-09 | Chugoku X-Ray Co., Ltd. | Eddy-current defect-detecting system for metal tubes |
| FR2570500A1 (en) * | 1984-09-20 | 1986-03-21 | Siderurgie Fse Inst Rech | METHOD AND DEVICE FOR DETECTING TYPICAL DEFECTS ON A RUNNING PRODUCT, PARTICULARLY FOR DETECTING CRACKS ON A SLAB |
| JP2009019909A (en) * | 2007-07-10 | 2009-01-29 | Hitachi Ltd | Method and device for discriminating defect |
-
1980
- 1980-04-07 JP JP4592980A patent/JPS56141553A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0107844A2 (en) * | 1982-10-21 | 1984-05-09 | Chugoku X-Ray Co., Ltd. | Eddy-current defect-detecting system for metal tubes |
| FR2570500A1 (en) * | 1984-09-20 | 1986-03-21 | Siderurgie Fse Inst Rech | METHOD AND DEVICE FOR DETECTING TYPICAL DEFECTS ON A RUNNING PRODUCT, PARTICULARLY FOR DETECTING CRACKS ON A SLAB |
| US4799011A (en) * | 1984-09-20 | 1989-01-17 | Institut De Recherches De La Siderurgie Francaise-Irsid | Process and device for detecting structural defects in a product utilizing differential detection of eddy currents |
| JPH0658346B2 (en) * | 1984-09-20 | 1994-08-03 | アンステイテイ デ リシエルシエ デ ラ シデリルギ フランセ−ズ（アイア−ルエスアイデイ−） | Method and apparatus for detecting product defects by eddy current |
| JP2009019909A (en) * | 2007-07-10 | 2009-01-29 | Hitachi Ltd | Method and device for discriminating defect |
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