已有的分布式光纤拉曼测温原理是采用拉曼谱的斯托克斯和反斯托克斯强度比值与温度的关系来获取温度。但是拉曼散射峰的强度较弱,导致光强信号处理难度大。基于键弛豫理论,结合拉曼频移与键参数的关系,建立了拉曼频移与温度的线性关系,提出了拉曼频移测温的新方法。计算了金刚石、石墨、CdS、Bi₂Se₃和Sb₂Te₃的拉曼频移高温效应,计算结果与实验测量值吻合较好,并获取了拉曼参考频率和原子结合能。所提方法有效避开了拉曼峰强对测温的影响,为分布式光纤拉曼测温方法的快速发展提供了新的理论方法。

The existing distributed optical fiber Raman temperature measuring principle is to use the relationship between Stokes and anti-Stokes intensity ratio and temperature to obtain the temperature. However, it is difficult to process the light intensity signal, since the Raman scattering peak intensity is relatively weak. According to the bond relaxation theory and the relationship between Raman frequency shift and bond parameters, a linear relationship between Raman frequency shift and temperature is established. And a new method for measuring Raman frequency shift temperature is proposed. The Raman frequency shift high temperature effects of diamond, graphite, CdS, Bi₂Se₃ and Sb₂Te₃ are calculated. These calculation results match well with the experimental ones and the Raman reference frequency and the atomic cohesive energy are obtained. The proposed method effectively avoids the influence of Raman peak strength on temperature measurement and provides a new theoretical method for the rapid development of distributed optical fiber Raman temperature measuring techniques.