Self-exciting optical strain gage
US5447075A · kind A · utility
4Cited by
6References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 9, 1993 |
| Grant date | Sep 5, 1995 |
| Priority date | — |
| Expiry date | Nov 9, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S73/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A self-exciting optical strain sensor (20) includes dual parallel bridges (22,24) having parallel facing surfaces (32,34). Light energy (38) entering a Fabry-Perot cavity (36) formed by this surfaces (32,34) induces a periodic buildup and release of energy in the cavity (36) which is directly related to the natural resonant frequency of the bridges (22,24). Analysis of the intensity of light emitted (50) from the cavity (36) determines the bridge natural frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.