通过利用聚酰亚胺涂覆裸光纤光栅的方法研制了一种增敏型光纤光栅温度传感器, 其反射波长的温度敏感系数由曾敏前的10pm/℃提升至40pm/℃。在-40~200℃测试环境中, 开展了传感器标定和温度精度测量试验。试验结果表明: 利用光纤光栅增敏封装, 在高低温环境中采用低精度光纤光栅解调仪, 传感器的测温精度由±0.4℃提升至±0.1℃。上述结果显示, 采用增敏封装结构能够提升光纤光栅温度传感器的测量精度, 减低制作成本。

In this paper, the sensitized fiber Bragg grating temperature sensor was designed and developed by coating the naked fiber Bragg grating with polyimide, and its temperature sensitivity coefficient was enhanced from 10 to 40pm/℃. Tests were performed on the sensor calibration and temperature accuracy measurement under the test environment of -40~200℃. The test results show that the temperature measurement accuracy can be improved from ±0.4℃ to ±0.1℃ by using fiber grating sensitization package and low-precision fiber grating demodulation instrument in high and low temperature environment. The material characteristics of the fiber Bragg grating temperature sensor with sensitized package were analyzed which can be used to improve the accuracy of temperature measurement, greatly reduce the application cost of fiber Bragg sensor, and lay a foundation for the comprehensive use of fiber Bragg grating temperature measurement.