Optical sensing arrangements

Details Optical sensing arrangements Optical sensing arrangements

1987-08-28

1989-09-12

Lee, John D.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356 72, 356 73, B01N 2117

Patent

active

048654167

ABSTRACT:
An optical sensing arrangement in which optical signals are transmitted along a plurality of discrete optical fibre paths of different lengths which are terminated in respective sensors adapted for sensing temperature, pressure or any other condition to be sensed at appropriate locations and in which optical signals reflected or otherwise caused to be transmitted back along the optical fibres of different lengths in response to the transmission of the optical signals along said fibres and in accordance with variations in conditions at the aforesaid locations are detected by optical time domain or frequency domain reflectometer means for determining the conditions at the sensor locations.

REFERENCES:
patent: 4319186 (1982-03-01), Kingsley
patent: 4362057 (1982-12-01), Gottlieb et al.
patent: 4459477 (1984-07-01), Asawa et al.
patent: 4525818 (1985-06-01), Cielo et al.
patent: 4560248 (1985-12-01), Cramp et al.
patent: 4581530 (1986-04-01), Brogardh et al.
patent: 4648082 (1987-03-01), Savit
patent: 4654520 (1987-03-01), Griffiths
patent: 4749254 (1988-06-01), Seaver
patent: 4794619 (1988-12-01), Tregay
Davis, "Fiber optic sensors: an overview", Optical Engineering, Mar./Apr. 1985, vol. 24, No. 2, pp. 347-351.

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