路用光纤光栅温度传感器标定方法对比分析

Comparative Analysis of Calibration Methods for Fiber BraggGrating Temperature Sensor Used in Asphalt Pavement

摘要:

路用光纤光栅温度传感器的温度灵敏度受其所测试的介质影响，对其进行试验标定是实现沥青路面绝对温度准确测试的前提条件.首先分别基于水浴和沥青混凝土试件环境对光纤光栅温度传感器波长飘移进行实测，获得反射波长与温度的对应关系；而后通过试验数据的线性回归分析，得到不同介质环境下光纤光栅温度传感器的标定公式，并对比分析同一传感器在水浴和沥青混凝土试件中的温度传感特性及差异产生的原因.结果表明：同一传感器在不同介质环境中的温度灵敏度是不同的，基于沥青混凝土试件环境的传感器标定方法更符合工程实际，具有一定的实用价值.

Abstract:

Temperature sensitivity of fiber Bragg grating temperature sensor used in asphalt pavement is influenced by its testing medium. As a result, calibration test for this type of sensor is the prerequisite to capture absolute temperature of asphalt pavement accurately. At first, the wavelength drift of fiber Bragg grating temperature sensor in both water bath and asphalt concrete specimen was monitored, through which the relationship between reflection wavelength and temperature was established. Then, calibration equations of each sensor were carried out by linear fitting analysis of test data. Temperature sensing characteristics and its difference of the same sensor in water bath and asphalt concrete were compared and analyzed. Results show that temperature sensitivities in different media are different even for the same sensor. Whats more, calibration based on asphalt concrete specimen environment is more consistent with the actual condition, which has a certain practical value.