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基于分布式拉曼温度传感器(RDTS)的温度解调原理,研究了光纤温度附加损耗对传感器测温结果的影响。采用一条光纤的不同位置同时测量两个温控箱温度的实验方法,得出当光纤温度在20.0~100.0℃范围内变化时,单位长度的光纤对该段光纤位置之后的光纤产生测温附加误差与该段光纤温度成正比以及与受温度影响的光纤长度成正比的规律,进而实现了对RDTS测温结果的修正。实验结果表明,2km中一段700m长的光纤在温控箱温度控制范围内,测量温度附加误差从修正前的最大4.09℃降低到修正后的小于0.47℃。
Based on the temperature demodulation principle of distributed Raman temperature sensor (RDTS), the influence of optical fiber temperature loss on the temperature measurement results of the sensor was studied. An experiment was conducted to measure the temperature of two temperature control boxes at the same time by using one optical fiber. It was found that when the temperature of the optical fiber varies from 20.0 to 100.0 ℃, the optical fiber with unit length produces an additional error in the temperature measurement of the optical fiber after the optical fiber position Which is directly proportional to the temperature of the fiber in the segment and proportional to the length of the fiber affected by the temperature, so as to correct the RDTS temperature measurement result. Experimental results show that a section of 700m long optical fiber in 2km is within the temperature control range of the temperature control box and the additional error of measuring temperature is reduced from the maximum 4.09 ℃ before correction to less than 0.47 ℃ after correction.