公路隧道光纤温度监测系统数据处理方法

Data Processing Method of Optical Fiber Temperature Monitoring System in Highway Tunnel

光纤温度监测系统能够对公路隧道中的温度异常变化及时预警。系统探测数据存在不规律缓变趋势,需要补偿和校正基底漂移影响。经过测试分析,光滑样条拟合和分段线性拟合均具有良好的修正效果。先对全段温度探测数据进行光滑样条拟合,基于此结果自动判断分段节点,再对原始数据做分段线性拟合。系统存储分段线性拟合的参数,用于自动计算各个探测点的温度修正值,使数据预处理方式具有更好的工程适用性。

Optical fiber temperature monitoring system can give early warning of abnormal temperature change in highway tunnel.It is necessary to compensate and correct the influence of base drift for the irregular and slow variation trend of the system detection data.After testing and analysis,smooth spline fitting and piecewise linear fitting have good correction effect.Firstly,smooth spline fitting is carried out for the whole temperature detection data,the segmented nodes are automatically judged based on the results,then the piecewise linear fitting is carried out for the original data.The system stores the parameters of piecewise linear fitting,which are used to automatically calculate the temperature correction value of each detection point,so that the data pretreatment method has better engineering applicability.