Optical fiber sensing system

Details Optical fiber sensing system Optical fiber sensing system

1988-03-11

1989-08-01

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231P, 356345, G01B 902

Patent

active

048535346

ABSTRACT:
An optical fibre sensing system for monitoring and/or measuring temperatures or pressures distributed around an optical fibre sensing loop. Light source and coupler are provided for applying continuous wave light to the loop so that the light propagates simultaneously in opposite directions around the loop with the resultant light output from the loop being detected by a detector. Light pulse generating source and coupler cause light pulses to propagate in one direction only around the loop and by so doing produce transient variations in the propagation constant along the looped fibre in dependence upon the distributed temperature or pressure around the loop. The detector detects the phase changes occurring in the continuous wave light received from the sensing loop due to variations in temperature or pressure around the loop.

REFERENCES:
patent: 4634852 (1987-01-01), Shaw
patent: 4767210 (1988-08-01), Kashyap

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