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HIGH SENSITIVITY FABRY-PEROT OPTICAL FIBER SENSOR FOR THE MEASUREMENT OF MECHANICAL FORCE

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Abstract

A high sensitivity polarimetric fiber sensor has been realized, using a high finesse fiber optical Fabry-Perot resonator. The frequency of the diode laser source is locked to the resonance peak of the Fabry-Perot, where the sensitivity is highest. Heterodyne polarization interferometry is then applied to measure the phase difference between the two eigenpolarizations, independently of their amplitudes. The sensor is insensitive to temperature changes of the Fabry-Perot cavity and to other perturbations that affect the length of the cavity. The sensitivity may be as much as 100 times larger than for a single-pass sensor. The fiber optical Fabry-Perot as a passive, lightweight sensor element, which can be made very compact. The application to the measurement of static force by induced birefringence is reported in detail.

© 1988 Optical Society of America

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