Optical fiber detection system using an intensity-modulating sensor
US4887901A · kind A · utility
3Cited by
1References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1986 |
| Grant date | Dec 19, 1989 |
| Priority date | — |
| Expiry date | Jul 24, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/35303
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to optical fiber measuring systems comprising a light source, a modulator for modulating the amplitude of the light signal emitted by the light source at a modulation frequency, an optical connecting fiber, a resonant cavity, a phase detector and a phase comparator. According to the invention, a sensor which is sensitive to an ambient parameter is incorporated into the cavity such that a variation in the parameter causes a variatioin in the phase of the signal at the modulation frequency. The invention can be applied to measuring systems for use in a severe environment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.