Peeling detector for tunnel wall
US6271878A · kind A · utility
9Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1997 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Sep 9, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21D11/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A peeling detector for a tunnel wall capable of rapidly inspecting the tunnel wall by effectively using infrared radiation is provided. The detector heats a tunnel wall 1 with a light emitting heater 4 while moving. An infrared camera 6 detects infrared radiation radiated by the wall after heating. Based on the quantity of the infrared energy, a difference in the temperature between peeled and normal portions induced by heating is grasped to evaluate whether the peeling of the tunnel wall 1 is present or not.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.