Interferometric optical sensor readout system

Jeffrey P. Andrews; Joseph A. McClintock

doi:10.1117/12.147975

12 July 1993 Interferometric optical sensor readout system

Jeffrey P. Andrews, Joseph A. McClintock

Proceedings Volume 1918, Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation; (1993) https://doi.org/10.1117/12.147975
Event: 1993 North American Conference on Smart Structures and Materials, 1993, Albuquerque, NM, United States

Abstract

A system has been developed to linearize the output of most interferometric optical sensors from dc to high frequency. The system employs a broad band light source with an unbalanced Mach-Zehnder interferometer to cancel phase changes induced by the sensor. An analog circuit is employed to produce the phase tracking signal which is linearly proportional to sensor phase. The system has demonstrated a phase resolution of 1.92 degree(s) when used to track an extrinsic Fabry-Perot strain sensor. This corresponds to a strain resolution of 0.35 (mu) (epsilon) . Frequency response is estimated to be greater than 100 kHz for the current system and above 100 MHz for an integrated optic embodiment. In addition, the system is insensitive to polarization and intensity changes induced by source drift or lead fiber perturbations.

Citation Download Citation

Jeffrey P. Andrews and Joseph A. McClintock "Interferometric optical sensor readout system", Proc. SPIE 1918, Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation, (12 July 1993); https://doi.org/10.1117/12.147975

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