高温光子晶体光纤温度传感器

A photonic crystal fiber (PCF) based high-temperature sensor is developed, which can be used in the temperature of higher than 500℃. The structure of the sensor is an Extrinsic Fabry-Perot Interferometer (EFPI) with a section of pure silica coreless fiber spliced to the end of a PCF. Thermal expansion and thermo-optic effect of the pure silica coreless fiber lead to the change of the optical cavity length. Based on the fiber optic white-light interferometry (WLI), the temperature is obtained by measuring the cavity length of the EFPI. The EFPI fiber optical temperature sensor with a cavity length of 175μm is measured in different temperature. The results show that the temperature fitting accuracy of 99.95% and the cavity length-temperature sensitivity of (0.851+0.0023T-0.000000957T²)nm/℃ are obtained within the temperature ranges from 27℃to 1100℃, and the temperature resolution is 0.225℃ at 1100℃.