Microbend fiber optic strain gauge
US5020379A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 9, 1987 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Sep 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A microbend strain gauge comprises a pair of plates having facing offset corrugations which clamp a signal optical fiber therebetween. The optical fiber is coated and a light signal is supplied to one end of the fiber which is read at an opposite end of the fiber by an optical sensor. Modulations in the light are primarily due to a difference in pressure being applied to the fiber by the plates. A second optical fiber, is subjected to the same thermal condition and its light signal compared to the light signal through the signal optical fiber to offset any temperature error introduced into the signal by changes in temperature. Aluminum, polyimide or gold coating increases temperature resistance for the fibers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.