Distributed Optical Fiber Temperature Measurement System And Software Performance

Distributed optical fiber Raman temperature measuring system is a kind of sensing system for real-time measurement of space temperature field.It has been widely used in coal mining,petrochemical,subway transportation and cable inspection.Combining with actual items about the coal mine temperature measurement,this thesis need to solve two aspects: one is the engineering requirements of system measurement accuracy in within ?1?C;two is the intuitive software performance of temperature data.To solve these problems is of great significance for the completion of the coal mine temperature monitoring project.Based on this,this thesis completed the following work:(1)According to the fiber Raman temperature measurement theory,a two channel distributed fiber Raman temperature measuring system is constructed,and the system hardware parameters are optimized.At the same time in order to obtain the temperature information of the reference fiber,the electronic temperature sensor receiving circuit design,which can realize real-time calibration system of temperature measurement data;design of optical switch circuit and realizes the fast switching of the measuring channel system.(2)Because the intensity of spontaneous Raman scattering of fiber is very low,the Raman scattering signal is very weak,and the weak sensing signal is easily affected by the system noise,thus reducing the temperature measurement accuracy.This paper realizes the real-time temperature measurement signal demodulation in the LabVIEW platform,and the cumulative average denoising algorithm in real-time to reduce the noise in the data acquisition stage,further denoising algorithm of temperature signal is filtered by Calman filter,the system finally realizes the temperature measurement accuracy of ?0.6 ?C.(3)In the VISUAL STUDIO 2010 software platform,combining with the actual temperature scenarios designed DTS industrialization graphical interface,to achieve real-time display of temperature signal in the corresponding actual monitoring sites,so as to solve the problems of long distance temperature measurement is difficult to quickly locate and display real-time temperature.Further addition of abnormal temperature alarm function in the distributed temperature measurement software system design,the man-machine interface of the system interface more friendly,so as to strengthen the application of distributed optical fiber temperature measurement system in practical engineering.At the same time,in order to facilitate the management of regional temperature information management,adding temperature data storage function and generating temperature report function,further improve the distributed temperature measurement software system.