光频域喇曼反射光纤温度传感器的频域参量设计

研究了功率调制型光频域反射技术空间采样函数的基本特征,得到了频域测量参量对测量距离和空间分辨率的基本限制；用数值计算模拟了功率调制型光频域光纤温度传感器的测量过程,通过比较模拟测量得到的喇曼反射强度空间分布因子对实际喇曼反射强度空间分布因子的再现程度,研究了调制频率范围、频率采样间隔以及起始调制频率对测量结果的影响,得出技术可行的最佳频域测量方案.

Frequency Parameters for an Optical Fiber Sensor System Based on Frequency Domain Raman Reflectometry

Frequency parameters are some of the key technical aspects in prototyping an optical fiber sensor system based on power modulated optical frequency domain Raman reflectometry. In this paper, basic limitations on the maximum measurable distance and the spatial resolution are discussed from the characteristics of the spatial sampling function. The measuring results of the power modulated optical frequency domain Raman reflectometry are numerically simulated. By comparing the simulated spatial Raman reflection distribution with the real spatial Raman reflection distribution, the influences of the sampling frequency range,the sampling frequency interval and the starting sampling frequency are studied. The possibility of recovering the spatial distribution of the Raman reflection by using finite frequency sampling points is revealed.