Optical sensing arrangements with wavelength and time-displacement detection
US4888480A · kind A · utility
5Cited by
4References
3Claims
0Family size
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Key dates
| Filing date | Dec 10, 1987 |
| Grant date | Dec 19, 1989 |
| Priority date | — |
| Expiry date | Dec 10, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/268
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A two-wavelength referencing optical sensing arrangement comprises two laser sources for producing simultaneous optical pulse signals of two different wavelengths for transmission over a plurality of discrete optical fibre paths to the sensors terminating such paths. Time-displaced return signals of different wavelengths received over the optical paths from sensors are fed into a single receiver which uses the intensity of signals of one wavelength in order to compensate for unknown losses in the system when indicating measurement of conditions sensed at the locations of the optical sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.