Abstract

We describe tunable-optical-filter-based white-light interferometry for sensor interrogation. By introducing a tunable optical filter into a white-light interferometry system, one can interrogate an interferometer with either quadrature demodulation or spectral-domain detection at low cost. To demonstrate the feasibility of effectively demodulating various types of interferometric sensor, experiments have been performed using an extrinsic Fabry–Perot tunable filter to interrogate two extrinsic Fabry–Perot interferometric temperature sensors and a diaphragm-based pressure sensor.

© 2005 Optical Society of America

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