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通过对分布式温度传感系统的基本原理的研究,分析了温度测量过程中影响测温准确度的原因,提出了基于环形结构的分布式温度传感器修正瑞利噪声的方法,有效地消除了波长相关损耗和瑞利噪声引起的测温误差。通过改变传感光纤前端的参考光纤的温度,即可解出光纤的瑞利噪声。实验结果表明,修正瑞利噪声后的分布式温度传感器,测温误差从8.5℃降低到0.8℃。
Based on the research of the basic principle of distributed temperature sensor system, the reason of temperature measurement accuracy is analyzed. A distributed temperature sensor based on ring structure is proposed to correct Rayleigh noise and the wavelength is effectively eliminated Related losses and Rayleigh noise temperature measurement error. The Rayleigh noise of the fiber can be solved by changing the temperature of the reference fiber at the front end of the sensing fiber. The experimental results show that the temperature error of the distributed temperature sensor after Rayleigh noise correction is reduced from 8.5 ℃ to 0.8 ℃.