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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