基于分布式光纤光栅传感的温度测量系统

Design and Implementation of Temperature Measurement System Based on Distributed Fiber Grating Sensor

基于拉曼散射原理设计了分布式光纤光栅测温系统。以LabVIEW为开发平台,对系统的数据采集和处理部分进行了软硬件设计。通过检测Anti-stokes光和Stokes光两者光强的比值解调出散射区的温度信息,利用软件去噪算法改善系统信噪比,提高了系统的测量精度。通过测量精度试验验证,系统精度较高,能实现光纤沿线温度的分布式测量,为分布式光纤测温技术在电缆温度在线监测中的应用提供了重要参考。

Introduces the design of a distributed temperature measurement system of fiber-optic cable based on Raman scattering.Designed hardware and software program of data acquisition and processing on the development platform LabVIEW.Demodulating the temperature information of the scattering region by their light intensity ratio of anti-Stokes light and stokes light.The system signal-to-noise ratio is improved by software digital cumulative average method which also improves the system temperature measurement accuracy.The system realized the distributed temperature measurement along the optical fiber,which provides an important reference for distributed temperature measurement technology in online monitoring of cable.