JPS6450953A - Signal processing apparatus for detecting flaw using eddy current - Google Patents
Signal processing apparatus for detecting flaw using eddy currentInfo
- Publication number
- JPS6450953A JPS6450953A JP62207982A JP20798287A JPS6450953A JP S6450953 A JPS6450953 A JP S6450953A JP 62207982 A JP62207982 A JP 62207982A JP 20798287 A JP20798287 A JP 20798287A JP S6450953 A JPS6450953 A JP S6450953A
- Authority
- JP
- Japan
- Prior art keywords
- signals
- pipe
- heat transfer
- unit
- 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
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
PURPOSE:To evaluate the damage of the heat transfer pipe of a heat exchanger without errors, by comparing signals from an eddy current flaw detector, and obtaining an AND value of the result of comparison. CONSTITUTION:A flaw detecting piece 2 is connected to an eddy current flaw detector 1, which generates four kinds of flaw detecting signals. The flaw detecting piece 2 is inserted into a heat transfer pipe 4 of a heat exchanger, which is a body to be checked, and moved in the pipe. The signals from the flaw detector 1 are combined and supplied to a signal operating unit 5. The effects of a pipe plate 3a and a supporting plate 3b of the heat transfer pipe 4 are removed in three signal operators 51-53. Then, the output signals from the unit 5 are inputted into a comparing and judging unit 6, which is provided with seven comparators 61a-61c, 62a, 62b, 63a and 63b. The signals are compared with each preset value and judged. The signals, which are outputted from the comparators of the unit 6, are inputted into an discriminating gate unit 7, in which AND gates and NAND gates are combined. Logic operations are performed, and the flaws and the attached materials of the heat transfer pipe 4, which is overlapped with the pipe plates 3a and the supporting plate 3b, are identified. Therefore, the accurate, quick judgment can be performed. Since the AND value of the result of the evaluation of a plurality of the signals is obtained, evaluation without errors can be performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62207982A JPS6450953A (en) | 1987-08-21 | 1987-08-21 | Signal processing apparatus for detecting flaw using eddy current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62207982A JPS6450953A (en) | 1987-08-21 | 1987-08-21 | Signal processing apparatus for detecting flaw using eddy current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6450953A true JPS6450953A (en) | 1989-02-27 |
Family
ID=16548720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62207982A Pending JPS6450953A (en) | 1987-08-21 | 1987-08-21 | Signal processing apparatus for detecting flaw using eddy current |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6450953A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0348152A (en) * | 1989-04-17 | 1991-03-01 | Idemitsu Eng Co Ltd | Eddy current flaw inspection and manufacture of reference sample therefor |
| JP2012141271A (en) * | 2011-01-06 | 2012-07-26 | Mitsubishi Heavy Ind Ltd | Attachment measuring device, attachment measuring method, and attachment measuring program |
| JP2017502293A (en) * | 2013-12-23 | 2017-01-19 | エレクトリシテ ド フランス | Method for quantitative prediction of steam generator plate contamination |
-
1987
- 1987-08-21 JP JP62207982A patent/JPS6450953A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0348152A (en) * | 1989-04-17 | 1991-03-01 | Idemitsu Eng Co Ltd | Eddy current flaw inspection and manufacture of reference sample therefor |
| JP2012141271A (en) * | 2011-01-06 | 2012-07-26 | Mitsubishi Heavy Ind Ltd | Attachment measuring device, attachment measuring method, and attachment measuring program |
| US9207211B2 (en) | 2011-01-06 | 2015-12-08 | Mitsubishi Heavy Industries, Ltd. | Deposit measurement apparatus, deposit measurement method, and computer-readable storage medium storing deposit measurement program |
| JP2017502293A (en) * | 2013-12-23 | 2017-01-19 | エレクトリシテ ド フランス | Method for quantitative prediction of steam generator plate contamination |
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