分布式光纤传感器多点温度测量的研究

基于光时域反射技术(OTDR)的原理,建立了拉曼散射分布式光纤多点温度测量系统,提出了一种新型的解调方法,即循环解调方法,用最近已知OTDR温度曲线解调下一个待测点OTDR温度曲线。通过实验验证了理论分析的正确性,该系统能够抑制温漂噪声的积累,防止瑞利背向散射光窜扰反斯托克斯背向散射光,其空间分辨力小于3m,温度分辨力约为±3℃,时间分辨力不大于3min。

Study on distributed optical fiber sensor for multi-point temperature measurement

Base on the theory of optical time domain reflectometer(OTDR),Raman scattering distributed optical fiber system for multi-point temperature measurement is established.A new demodulation method is proposed, that is circulation demodulation method.The OTDR temperature curve of the next point to be measured is demodulated by the current OTDR temperature curve.The experiment validated that the theoretical analysis is correct,and the system can inhibit the accumulation of temperature noise and prevent Rayleigh back scattering light from harassing anti-Stokes back scattering light.The spatial resolving power is less than 3m,the temperature resolving power is about ±3℃,and time resolving power is not more than 3min.