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The sensor is designed by combination of photonic crystal fiber (PCF) and fiber Bragg grating (FBG), which is based on Sagnac interferometer to measure temperature and stress simultaneously in changing environment. The interference between two parameters is avoided by cascading two wavelength moving reverse components in this sensor system. When the PCF is connected with FBG or not, the linearity of stress sensing is 0.98 and 1, respectively. The stress sensitivity for − 0.150 nm/N and the temperature sensitivity for 0.0113 nm/°C are achieved on the dualparameter system. In addition, the measurement of dualparameters of temperature and stress of the complex environment is successfully realized in experiment.

Dual parameter measurement system for temperature and stress based on Sagnac interferomter