JPS5589743A - Electromagneto oscillation head for crack detection of metal eddy current - Google Patents
Electromagneto oscillation head for crack detection of metal eddy currentInfo
- Publication number
- JPS5589743A JPS5589743A JP16389078A JP16389078A JPS5589743A JP S5589743 A JPS5589743 A JP S5589743A JP 16389078 A JP16389078 A JP 16389078A JP 16389078 A JP16389078 A JP 16389078A JP S5589743 A JPS5589743 A JP S5589743A
- Authority
- JP
- Japan
- Prior art keywords
- detection
- pin
- coil
- pin shape
- cores
- 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
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
PURPOSE: To enable accurate inspection with small size, by providing pin shape core for detection winding the detection pin coil, and implanting a number of pin shape cores on the end surface of permanent magnet incorporated at the end of external circumference of the coil.
CONSTITUTION: AC current flows to the pin shape core 2 for detection winding the detection pin coil 3 at the center of the holders 4, 5 before and after and contained inside the oscillation head 1. Further, the ring permanent magnet 8 is incorporated in the end of external circumference of the pin coil 3 and a number of pin shape cores 9 are implanted at the end surface in circular shape. The magnetic flux from the cores 9 penetrates in straight line from the sharp tip concentratingly and with repulsion each other to completely magnetize the inspected material to the deep part. Further, the AC magnetic field by the pin shape core 2 for detection is concentratedly penetrated from the tip, then the skin effect of inspected material is not subjected and it penetrates to the deep part of the inspected material, enabling to produce eddy current internally. Accordingly, the crack detection for ferromagnetic substance can be made with a small voltage, small sized and light weight unit.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16389078A JPS5589743A (en) | 1978-12-27 | 1978-12-27 | Electromagneto oscillation head for crack detection of metal eddy current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16389078A JPS5589743A (en) | 1978-12-27 | 1978-12-27 | Electromagneto oscillation head for crack detection of metal eddy current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5589743A true JPS5589743A (en) | 1980-07-07 |
Family
ID=15782736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16389078A Pending JPS5589743A (en) | 1978-12-27 | 1978-12-27 | Electromagneto oscillation head for crack detection of metal eddy current |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5589743A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0105993A1 (en) * | 1982-10-08 | 1984-04-25 | Ngk Insulators, Ltd. | Heater with solid electrolyte |
| KR100635711B1 (en) | 2004-07-27 | 2006-10-17 | 한국표준과학연구원 | Measuring method and apparatus for corrosion position and remain thickness of metal pipe using pulse an eddy current |
| JP2007078500A (en) * | 2005-09-14 | 2007-03-29 | National Institute Of Advanced Industrial & Technology | Method and apparatus for measuring critical current density of superconductive film |
-
1978
- 1978-12-27 JP JP16389078A patent/JPS5589743A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0105993A1 (en) * | 1982-10-08 | 1984-04-25 | Ngk Insulators, Ltd. | Heater with solid electrolyte |
| KR100635711B1 (en) | 2004-07-27 | 2006-10-17 | 한국표준과학연구원 | Measuring method and apparatus for corrosion position and remain thickness of metal pipe using pulse an eddy current |
| JP2007078500A (en) * | 2005-09-14 | 2007-03-29 | National Institute Of Advanced Industrial & Technology | Method and apparatus for measuring critical current density of superconductive film |
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