Processing of one-fiber interferometric fiber-optic sensor signals
Tino, Alavie, A.
Grossman, Barry G.
Thursby, Michael H.
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Recent research conducted in the Fiber -Optic Sensor Systems Laboratory at Florida Institute of Technology in fiber -optic strain sensors for use in smart structures has concentrated primarily on one -fiber interferometers. Sensors using this technique are of particular interest because they are rugged and provide reasonable strain sensitivities, typically a thousand times that of microbend sensors, while requiring only a single optical fiber. As in two -fiber interferometers, some method must be used to convert the sensor signal output to an absolute strain value. One technique is to provide active phase tracking to keep the sensor signal output at phase quadrature for maximum sensitivity and to eliminate fringe count uncertainty. This paper contains a description of a technique for active phase tracking in polarimetric sensors composed of high- and low- birefringence fiber using an electro -optic polarization modulator. On -going development of artificial neural processors for processing fiber - optic sensor signals from both polarimetric and few mode sensors, as well as generating control signals for actuators in smart structures, is also discussed. © 1990 SPIE.