JPS5629156A - Noncontact type flaw detector - Google Patents
Noncontact type flaw detectorInfo
- Publication number
- JPS5629156A JPS5629156A JP10462079A JP10462079A JPS5629156A JP S5629156 A JPS5629156 A JP S5629156A JP 10462079 A JP10462079 A JP 10462079A JP 10462079 A JP10462079 A JP 10462079A JP S5629156 A JPS5629156 A JP S5629156A
- Authority
- JP
- Japan
- Prior art keywords
- distance
- sensor
- holder
- steel pipe
- inspected object
- 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 Ultrasonic Waves (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
PURPOSE: To always keep constant the distance between inspected object and the flaw detecting sensor, by floating the sensor holder from the surface of inspected object through the use of a pair of magnets located mutually to be repulsive.
CONSTITUTION: On the surface of the steep pipe 1 to be inspected, the steel pipe 1 is turned while the roller 4 at both ends of the detection head fixed plate 2 is in contact, and the entire surface is scanned with the flaw detecting sensor 16. In this case, the holder 10 having the sensor 16 is floated by a distance and in noncontact state from the surface of steel pipe with the repulsive force by the permanent magnets 30, 32 and electromagnet 34. Next, if the distance between the steel pipe 1 and the holder 10 is shorter than the reference distance, the output of the distance sensor 18 is higher than the reference potential set to negative output of the differential amplifier 40, and the amplifier 40 produces positive output and magnetizes the magnet 34 via the amplifier 42 so that the repulsive force between the magnets 30 and 32 can be increased, and the distance is corrected to the reference interval. If the distance is longer, the opposite processing as the above is made. Accordingly, the distance between the inspected object and the flaw detecting sensor is always kept constant.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10462079A JPS5629156A (en) | 1979-08-17 | 1979-08-17 | Noncontact type flaw detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10462079A JPS5629156A (en) | 1979-08-17 | 1979-08-17 | Noncontact type flaw detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5629156A true JPS5629156A (en) | 1981-03-23 |
Family
ID=14385477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10462079A Pending JPS5629156A (en) | 1979-08-17 | 1979-08-17 | Noncontact type flaw detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5629156A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008068972A1 (en) * | 2006-12-04 | 2008-06-12 | Sumitomo Metal Industries, Ltd. | Follow-up device for detecting flaw of pipe and automatic flaw detection apparatus of pipe employing it |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51114188A (en) * | 1975-03-31 | 1976-10-07 | Nippon Steel Corp | Soft contact detector |
-
1979
- 1979-08-17 JP JP10462079A patent/JPS5629156A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51114188A (en) * | 1975-03-31 | 1976-10-07 | Nippon Steel Corp | Soft contact detector |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008068972A1 (en) * | 2006-12-04 | 2008-06-12 | Sumitomo Metal Industries, Ltd. | Follow-up device for detecting flaw of pipe and automatic flaw detection apparatus of pipe employing it |
| JP2008139191A (en) * | 2006-12-04 | 2008-06-19 | Sumitomo Metal Ind Ltd | Follower device for flaw detection of pipe and automatic flaw detector of pipe using it |
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