JPS5752856A - Electromagnetic ultrasonic flaw detecting device - Google Patents
Electromagnetic ultrasonic flaw detecting deviceInfo
- Publication number
- JPS5752856A JPS5752856A JP55127265A JP12726580A JPS5752856A JP S5752856 A JPS5752856 A JP S5752856A JP 55127265 A JP55127265 A JP 55127265A JP 12726580 A JP12726580 A JP 12726580A JP S5752856 A JPS5752856 A JP S5752856A
- Authority
- JP
- Japan
- Prior art keywords
- gap
- transmitting
- receiving coil
- changes
- detected
- 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
- G01N27/9053—Compensating for probe to workpiece spacing
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 Ultrasonic Waves (AREA)
Abstract
PURPOSE:To detect flaws exactly even if a gap between a transmitting and receiving coil and the surface of the material to be tested changes, by detecting the gap between said coil and said material to be tested and by changing the amplification of a receiving amplifier in response to magnitude of said detected signal. CONSTITUTION:A transmitting and receiving coil 4 and a gap sensor 13 are provided on the end of a central leg of an iron core 3 having a cross section in the shape of a character E, and the gap sensor 13 is driven to detect a gap between an object 5 to be inspected and the transmitting and receiving coil 4. A gap detecting circuit 14 calculates the attenuating amount of an ultrasonic received signal level corresponding to the gap detected. When the gap between the object 5 to be inspected and the transmitting and receiving coil 4 changes, the change is detected by means of the gap sensor 13 and the gap detecting circuit 14, thereby the amount of attenuation of the received signal level corresponding to the gap and a correction amount equivalent to said attenuation amount are generated in a compensating circuit 15 to allow the amplification degree of the amplifier 9 to be corrected. Even if the gap between the object 5 and the transmitting and receiving coil changes, the capability to detect flaws is kept constant at all times.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55127265A JPS5752856A (en) | 1980-09-16 | 1980-09-16 | Electromagnetic ultrasonic flaw detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55127265A JPS5752856A (en) | 1980-09-16 | 1980-09-16 | Electromagnetic ultrasonic flaw detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5752856A true JPS5752856A (en) | 1982-03-29 |
Family
ID=14955739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55127265A Pending JPS5752856A (en) | 1980-09-16 | 1980-09-16 | Electromagnetic ultrasonic flaw detecting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5752856A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58223751A (en) * | 1982-06-23 | 1983-12-26 | Hitachi Ltd | Electromagnetic ultrasonic probe |
| JPH03291407A (en) * | 1990-04-10 | 1991-12-20 | Mitsubishi Heavy Ind Ltd | Desulfurizer |
| FR2677125A1 (en) * | 1991-05-30 | 1992-12-04 | Micrel | Apparatus and method for detecting defects on metal pieces |
| JP2008212705A (en) * | 2002-04-11 | 2008-09-18 | A-Dec Inc | Fluid control system for chair |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55129749A (en) * | 1979-03-28 | 1980-10-07 | Sumitomo Metal Ind Ltd | Sensitivity correction method for electromagnetic ultrasonic wave probe |
-
1980
- 1980-09-16 JP JP55127265A patent/JPS5752856A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55129749A (en) * | 1979-03-28 | 1980-10-07 | Sumitomo Metal Ind Ltd | Sensitivity correction method for electromagnetic ultrasonic wave probe |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58223751A (en) * | 1982-06-23 | 1983-12-26 | Hitachi Ltd | Electromagnetic ultrasonic probe |
| JPH03291407A (en) * | 1990-04-10 | 1991-12-20 | Mitsubishi Heavy Ind Ltd | Desulfurizer |
| FR2677125A1 (en) * | 1991-05-30 | 1992-12-04 | Micrel | Apparatus and method for detecting defects on metal pieces |
| JP2008212705A (en) * | 2002-04-11 | 2008-09-18 | A-Dec Inc | Fluid control system for chair |
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