Interferometric thermal detector

Details Interferometric thermal detector Interferometric thermal detector

1987-01-28

1988-11-15

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250340, 374131, G01J 548

Patent

active

047851740

ABSTRACT:
An interferometric sensor (10) employs a sensing optical fiber (12) and a reference optical fiber (14). The sensing fiber (12) has a coating 16 thereon responsive to radiated thermal energy while the reference fiber is shielded therefrom. Both the sensing and reference fibers are subjected to the same ambient environment so that both fibers are subjected to heating by convection or conduction in essentially the same amounts. As a result, the sensor (10) is substantially nonresponsive to convected or conducted thermal energy while being highly responsive to radiated energy, particularly in the 6-30 micron wavelength region.

REFERENCES:
patent: 4418338 (1983-11-01), Burt
W. Eickhoff, "Temperature Sensing by Mode-Mode Interference in Birefringent Optical Fibers", Optics Letters, vol. 6, No. 4 (Apr. 1981) pp. 204-206.

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