Raman散射型分布式光纤温度测量方法的研究

The Research of Raman Type Distributed Optical Fiber Temperature Measuring Method

本文讨论了 Ram an散射型分布式光纤温度测量的原理和单通道、双通道工作模式的 4种解调方法 ;给出了系统的相对灵敏度 Sa、Ss、Sa/ s和 Sa/ R的表达式 ,在 0～ 12 0℃范围内 ,其理论值分别为 1.0 6 5%· K- 1 、0 .10 4%· K- 1 、0 .86 2 %· K- 1 和 1.0 6 5 %· K- 1 。由于系统波分复用器存在“串音”,因此实际系统的相对温度灵敏度低于理论计算值。

WT5”BZ]:The principle of Raman scattering type distributed optical fiber temperature measuring method has been researched,and four demodulation methods using single channel and double channels have been discussed.The expression of relative temperature sensitivity S a,S s,S a/s and S a/R of four demodulation methods have been put forward and the values are 1.065 %·K -1 ,0.104 %·K -1 ,0.862 %·K -1 and 1.065 %·K -1 respectively in the 0～120 ℃ region.Because of the “cross talk” of wavelength division multiplexer,the relative temperature sensitivity of practical system is lower than the theoretical value. [WT5”HZ]