Abstract
We present a high-resolution simultaneous strain and temperature measurement scheme using
${\pi }$
-phase-shifted fiber Bragg grating written in PANDA-type polarization maintaining fiber. Two optical parameters, the Bragg frequency and the birefringence-introduced frequency difference, are measured to perform the discrimination of strain and temperature. A double-sideband interrogation method together with a cross-feedback technique is introduced, which significantly reduces the measurement error in birefringence-introduced frequency difference, and hence improves the sensing resolution of strain and temperature. In the demonstration experiment, simultaneous measurement of strain and temperature with resolutions of 0.018
$\mu$
${\epsilon }$
and 0.0014
$\boldsymbol {^{\circ }}$
C respectively is realized.
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