Method and apparatus for sensing disturbance using fiber-optic polarization rotation
US4922095A · kind A · utility
12Cited by
27References
25Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 11, 1989 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | May 11, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L11/025
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus for sensing vibrational disturbance using fiber optic coils conducting circularly polarized light. A circularly polarized light source illuminates each of a sensing fiber optic coil in a disturbance-sensitive environment and a reference fiber optic coil in a constant environment, and light from both coils is analyzed through polarization shuttering to detect the degree of polarization rotation thereby to enable determination of frequency and amplitude of the disturbance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.