A fast response fiber Bragg grating temperature sensor was developed for the rapid temperature measurement needs of the neutral beam injector beam deflection system. Based on the thermal response principle to analyze the impact of the sensor's main design parameters on the response time,using finite element analysis software to simulate the response time of the sensor with different inner diameters and materials,the smaller the heat storage capacity of the encapsulated tube material,the smaller the inner diameter of the tube,the faster the response time of the sensor. The encapsulation fabricated the sensor in kind,and the temperature characteristics and dynamic response performance of the sensor were experimentally verified. The results show that the reflected wavelength of the FBG still maintains excellent linearity in temperature tests from-25～250 ℃. Above 0.996,the measurement accuracy of the sensor can reach 0.6％ F.S,with a hysteresis error of 1.5％ F.S. In the transient temperature change,the response time of the sensor is 0.85 s,which has a dynamic performance superior to that of the encapsulated thermocouple sensors,and is more suitable for the beam deflection system for high Stable and fast temperature monitoring.
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