Research on temperature-strain sensor based on FBG integrated F-P cavity
Optical fiber temperature-strain sensors have been widely used in health detection in the fields such as electric power and buildings because of their outstanding performance.This paper proposes a temperature-strain integrated sensor with fiber Bragg grating(FBG)combined with Fabry-Perot(F-P)structure.The F-P sensor is made of fused silica optical fiber.FBG can measure temperature and strain,while the fiber optic FP sensor is only sensitive to strain.By demodulating the two sensor wavelengths,the simultaneous measurement of temperature and strain can be realized by using the transfer matrix.The experimental results showed that the temperature and strain sensitivities of the FBG were 8.4 pm/℃and 0.62 pm/με,respectively,and the strain sensitivity of the F-P sensor was 1.9 μm/ε,with linearity better than 99%.The sensor has the characteristics of simple structure,low cost,easy fabrication,etc.,and has broad application prospects.
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