Distributed-feedback fiber laser sensor for simultaneous strain and temperature measurements operating in the radio-frequency domain

Abstract

Radio-frequency (rf) beat frequencies between two longitudinal modes and two polarization modes of a birefringent dual-longitudinal-mode moiré distributed-feedback fiber laser are employed to measure strain and temperature simultaneously. Operating entirely in the rf domain, this approach potentially allows one to employ low-cost and precise rf measuring techniques. A strain–temperature cross sensitivity of the strain- and the thermo-optic coefficients, which can be neglected in wavelength-based grating sensors, has been observed. The achieved sensor accuracy was ±15 µ∊ and ±0.2 °C.

© 2001 Optical Society of America

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