Abstract
Optical fiber sensors in resonator forms such as fiber gratings and fiber etalons are being used in fiber optic smart structure sensing applications.1,2 The ability to interrogate small changes in the resonant cavity length is essential to the realization of high sensor sensitivity. We present an interrogation scheme in which changes in the length of a resonator sensor are converted to phase changes in a read-out interferometer with an effective phase gain which enhances the system sensitivity. The use of a read-out interferometer for interrogating fiber Bragg grating sensors has been previously shown.3 The scheme we describe here uses a long coherence length laser source frequency locked to the resonance of the passive resonator sensor and the resulting frequency modulated laser output is interrogated with a long path length difference Mach-Zehnder interferometer.
© 1994 Optical Society of America
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