Optical sensing arrangements with wavelength and time-displaceme

Details Optical sensing arrangements with wavelength and time-displaceme Optical sensing arrangements with wavelength and time-displaceme

1987-12-10

1989-12-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, G01J 350

Patent

active

048884804

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.

REFERENCES:
patent: 4356396 (1982-10-01), Ruell et al.
patent: 4477725 (1984-10-01), Asawa et al.
patent: 4523092 (1985-06-01), Nelson
patent: 4703175 (1987-10-01), Salour et al.

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