Fiber optic sensing system

Details Fiber optic sensing system Fiber optic sensing system

1989-09-07

1991-02-26

Ullah, Akm

Optics: measuring and testing

Range or remote distance finding

With photodetection

356345, 250227, G02B 602, G02B 616, G01B 902

Patent

active

049956973

ABSTRACT:
A fiber optic interferometer utilizes a low coherence LED laser as a light source which is filtered and driven at two RF frequencies, high and low, that are specific to the initial length of the resonator chamber. A displacement of a reflecting mirror changes the length traveled by the nonreferencing signal. The low frequency light undergoes destructive interference which reduces the average intensity of the wave while the high frequency light undergoes constructive interference which increases the average intensity of the wave. The ratio of these two intensity measurements is proportional to the displacement incurred.

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patent: 3970389 (1979-07-01), Mendrin et al.
patent: 4492464 (1985-01-01), Bourdet et al.
patent: 4627728 (1986-12-01), Willson
patent: 4644556 (1987-02-01), Petuchowski et al.
patent: 4738527 (1988-04-01), McBrien
patent: 4753529 (1988-06-01), Latton
patent: 4768880 (1988-09-01), Tur et al.
patent: 4789240 (1988-12-01), Bush
patent: 4873989 (1989-10-01), Einzig

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