Temperature sensor and temperature sensing system based on active phase-shifted fibre grating

摘要

#$%^&*AU2017202878B220190912.pdf#####Abstract Provided are a temperature sensor and a temperature sensing system based on an active phase-shifted grating, belonging to fibre sensing technical field. The temperature sensor comprises a pump laser, a wavelength division multiplexer, an optical detector and an active phase-shifted fibre grating with rr phase shift. Pump light emitted by the pump laser enters the active phase-shifted fibre grating through the wavelength division multiplexer. Then the active phase-shifted fibre grating absorbs the pump light and emits laser light, which travels back through the wavelength division multiplexer and enters the optical detector. The optical detector is used to measure output power of the active phase-shifted fibre grating, to analyze the power to obtain ambient temperature of the active phase-shifted fibre grating. Compared with wavelength demodulation based fibre grating sensors, this temperature sensor can obtain ambient temperature of the active phase-shifted fibre grating solely through analysis of the output power of the active phase-shifted fibre grating measured by the optical detector. (Fig. 1) 17Drawings: 10 Fig. 12 13 a c b 14 15 Fig. 1 A 140 139 138 137 141 136T1 35 133 132 1 1 A Fig. 2 134F 131 140 -13 132 Fig. 3