JPS57142554A - Detector for damage position of paint coat on pipeline - Google Patents
Detector for damage position of paint coat on pipelineInfo
- Publication number
- JPS57142554A JPS57142554A JP2783281A JP2783281A JPS57142554A JP S57142554 A JPS57142554 A JP S57142554A JP 2783281 A JP2783281 A JP 2783281A JP 2783281 A JP2783281 A JP 2783281A JP S57142554 A JPS57142554 A JP S57142554A
- Authority
- JP
- Japan
- Prior art keywords
- paint coat
- damage
- pipe body
- pulse
- damage position
- 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
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/20—Investigating the presence of flaws
- G01N27/205—Investigating the presence of flaws in insulating materials
Abstract
PURPOSE:To detect damage position easily at a high accuracy by measuring impedance variation between the pipe body and electrodes arranged parallel thereto in the damage to the paint coat with a timedomain reflectmeter. CONSTITUTION:When a damage P exists on a paint coat of a pipe body 1 provided under water or ground, a current (i) flows between the pipe body 1 and the electrodes 15 arranged parallel thereto through water or soil. The current thus flowing is generally determined by the size of the damage or the resistance factor of water of soil. When the pipe body and the electrodes form a transmission circuit, the impedance changes. Entailing the change in the impedance, a reflected pulse is generated in the direction opposite to the advancing of the pulse to be applied from the end. The change in time of the pulse is measured with a timedomain reflectmeter (TDR) to detect damage position on the paint coat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2783281A JPS57142554A (en) | 1981-02-27 | 1981-02-27 | Detector for damage position of paint coat on pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2783281A JPS57142554A (en) | 1981-02-27 | 1981-02-27 | Detector for damage position of paint coat on pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS57142554A true JPS57142554A (en) | 1982-09-03 |
Family
ID=12231907
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2783281A Pending JPS57142554A (en) | 1981-02-27 | 1981-02-27 | Detector for damage position of paint coat on pipeline |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57142554A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5376889A (en) * | 1991-10-10 | 1994-12-27 | Hughes Aircraft Company | System and method for detecting and locating flaws on or beneath a surface |
-
1981
- 1981-02-27 JP JP2783281A patent/JPS57142554A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5376889A (en) * | 1991-10-10 | 1994-12-27 | Hughes Aircraft Company | System and method for detecting and locating flaws on or beneath a surface |
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