Stabilized extrinsic fiber optic Fabry-Perot sensor for surface acoustic wave detection

Tuan A. Tran

doi:10.1117/12.2321915

1 December 1991 Stabilized extrinsic fiber optic Fabry-Perot sensor for surface acoustic wave detection

Tuan A. Tran

Proceedings Volume 1584, Fiber Optic and Laser Sensors IX; (1991) https://doi.org/10.1117/12.2321915
Event: OE Fiber, 1991, Boston, MA, United States

Abstract

A surface acoustic wave (SAW) sensor based on an extrinsic Fabry-Perot mterferometer is described. A single-mode fiber, used as the input/output fiber, and a multimode fiber, used solely as a reflector, form an air-gap that acts as a low-finesse Fabry-Perot cavity. The Fresnel reference reflection from the glass/air interface at the front of the air-gap interferes with the sensing reflection from the air/glass interface at the far end of the air-gap. Strains in the silica tube housing the two fibers change the air-gap length, thereby altering the phase difference between the reference and sensing reflections. A theoretical analysis of the interaction between the strain induced by elastic stress wave fields and the fiber sensor is presented. A dual optical wavelength stabilization technique is used to minimize signal drifts. Signal to noise ratios on the order of 39 dB are obtained with a sensitivity of 4° μstrain cm^-1 for strain measurements.

Citation Download Citation

Tuan A. Tran "Stabilized extrinsic fiber optic Fabry-Perot sensor for surface acoustic wave detection", Proc. SPIE 1584, Fiber Optic and Laser Sensors IX, (1 December 1991); https://doi.org/10.1117/12.2321915

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