30km Distributed Optical Fiber Raman Photons Temperature Lidar

摘要

The optical fiber Raman temperature (OFRT) Lidar is a real time, on line and multi-point temperature measurement system. 30k spot temperature information on space field can be measured and located the position by 30km OFRT Lidar It is a new technology integration of optical-mechanic-electric and computer. The system can take real time, on line measurement of spatial temperature field. In the system, optical fibers are both transmission media and sensing media. The intensity of anti-stokes Raman backscattering of optical fiber is modulated by the spatial temperature field where the optical fiber is laid. After signal processing and demodulation, the information of temperature can be extracted from the noise and can be displayed in real time. In time domain, using the velocity of light wave in optical fiber, the time interval of back-direction light wave and optical fiber OTDR technology The amplification of anti-stokes Raman spontaneous scattering (ARS) and the temperature effect have been first observed and applied to OFRT Lidar. The performance of OFRT Lidar is following: fiber length: 25.2km; temperature measuring range: 0-100℃(can be expand) temperature uncertainty: +-2℃: temperature resolution: 0.1; spatial resolution: 5m: measurement time: 5min; Main unit operation temperature range: 0―40℃. The optical fiber sensor probes and the software for signal processing are also discussed.