测量海水温度分布的光纤光栅传感系统研究

介绍了基于光纤光栅的传感原理,完成了对光纤光栅温度传感器的实验室标定,得到了每个传感器专门的参数.通过对传感器进行铠装封装,排除了海水压力等因素的影响;设计了200m的光纤光栅传感器阵列,并将其应用到海洋环境探测中.试验对中国南海海域200m深的海水剖面温度进行了测试.提出了对测量数据应用Levenberg-Marqu...

Research on optic fiber Bragg grating temperature sensing system for seawater measurement

The principle of FBG temperature monitoring was introduced,the calibration work for FBG temperature sensors were finished in laboratory,each sensor's specific parameters was obtained.From sophisticated sensor package,the sensors can eliminate the effect by water pressure and other factors,then sensors were screened out for experiment.200 m optic fiber Bragg grating sensor array was designed,and was used in marine environment detection.The experiments were performed in South China Sea and got 200 meters deep seawater profile temperature.The curve fitting method was proposed to process the data based on Levenberg-Marquardt algorithm.By curve fitting to the data acquired,the precision was better than 0.2 ℃,which verified the effectiveness of the method.This result has practical value for marine environment detection.