Design and research of fiber Bragg temperature sensor with tubular package

To meet the requirements of high temperature resistance, fast response, and stable temperature measurement in neutral beam injection systems and other environments, this paper proposes a simple fiber optic temperature sensor packaged in a copper casing structure. Temperature can be accurately measured quickly and effectively shielded against external forces by this sensor. With the temperature range of -25 to 250°C, transient thermal response simulation and experimental testing of the sensor show that the packaged temperature sensor has a sensitivity of 11.2pm/°C, linearity of up to 0.996, and a response time t63 of 0.75s. Comparative tests demonstrate that the thermal response of the fiber optic grating sensor surpasses the packaged thermocouple sensor. Furthermore, the sensor can withstand impact from both lateral and longitudinal external forces, demonstrating excellent stability.