Abstract

A high-resolution strain/temperature sensing system based on a fiber Bragg grating–Fabry–Perot cavity (FBG–FPC) and a wavelength-swept single-longitudinal-mode laser diode (modulated by a sawtooth signal) is proposed. The high-finesse ($\sim$627) FBG–FPC formed by two uniform FBGs of high reflectivity ($\sim$99.5%) is used both as a strain/temperature sensor and a FPC with ultranarrow ($\sim$0.12 pm) transmission bands. Using a photodetector to detect the transmissive light of the laser diode through the FBG–FPC, wavelength demodulation is achieved by mapping wavelength measurement to time measurement. Both strain sensing and temperature sensing with a resolution of 0.11$\ \mu\varepsilon$ and 0.014$\,^{\circ}\hbox{C}$, respectively, have been demonstrated.

© 2009 IEEE

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