为了研究温度传感器测量小热惯量温度场的准确性和即时性,对2 ml沸水分别利用水银温度计、热电偶和金属管封装的光纤光栅温度传感器进行测温,所测温度的值分别为94.0 ℃、95.0 ℃和98.6 ℃,三者的响应时间分别为10.0 s、8.5 s、2.5 s。可见,小体积金属管封装的光纤光栅温度传感器测量精度高,响应速度快。并对不同封装工艺的光纤光栅温度传感器的传感特性进行比较,结果表明,对于小热惯量温度场的监测,传感器的封装方式应采用小内径金属管封装方式。

To explore the accuracy and instantaneity of the measurement of small thermal inertia temperature field with temperature sensors, experiments are conducted to monitor the temperature of 2 ml boiling water by using mercury thermometers, thermocouple and fiber Bragg grating. Measured temperature is 94.0 ℃, 95.0 ℃, 98.6 ℃ and the response time is 10.0 s, 8.5 s, 2.5 s, which proves that fiber Bragg grating temperature sensor packaged by small volume of metal pipe has the highest immediacy and accuracy. By comparing different temperature sensing characteristics of fiber Bragg grating sensors in different encapsulation technology, the conclusion is that fiber Bragg grating packaged by small inner diameter metal tube is a suitable kind of temperature sensor to monitor the small thermal inertia temperature field.