Serial interferometric fiber-optic sensor array

Details Serial interferometric fiber-optic sensor array Serial interferometric fiber-optic sensor array

1988-08-18

1989-12-26

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250231R, 356345, G01B 902

Patent

active

048899860

ABSTRACT:
A new serial interferometric fiber-optic sensor array configuration is diosed. In a preferred embodiment of the invention pulsed light from a laser source is transmitted into a long input fiber which forms a series of N sensor elements, each of optical path length L. Each sensor element is responsive to any change in an associated predetermined physical parameter for changing its optical path length. A small portion of the optical power in the input fiber is tapped-off to a long output fiber at tap points between adjacent sensor elements and at tap points before the first and after the last sensor elements in order to produce at the output of the last sensor element a series of N+1 pulses separated in the time domain. This series of N+1 pulses from the output of the last sensor element is applied to each of two paths in a compensating interferometer of optical path imbalance L. The compensating interferometer coherently mixes pulses obtained from each adjacent pair of tap points to obtain a series of interferometric signals respectively indicative of any change in the physical parameters to which the sensor elements are respectively responsive.

REFERENCES:
patent: 4545253 (1985-10-01), Avicola
patent: 4697926 (1987-10-01), Youngquist
patent: 4699513 (1987-10-01), Brooks et al.
patent: 4770535 (1988-09-01), Kim et al.
patent: 4775216 (1988-10-01), Layton

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