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传统的光纤分布式温度传感器存在精度不高和设备昂贵的缺点。设计了新型的基于受激布里渊散射(SBS)的分布式温度传感器,通过将乙醇填充到光子晶体光纤中,利用乙醇的折射率随温度变化的特性,光子晶体光纤的有效面积也随之变化,使得光纤输出功率随着温度的变化而变化;数值求解基于光纤的SBS耦合方程组,获得输出功率和温度的变化关系,从而验证了新的传感机制的可行性。基于新设计,要达到1℃的分辨率,功率测量设备的动态测量范围只需要达到40dB,远小于传统测量系统中频率测量设备的80dB。同时还对该系统中可能存在的一些影响因素进行了分析。
The traditional optical fiber distributed temperature sensor has the defects of low accuracy and high equipment cost. A novel distributed temperature sensor based on stimulated Brillouin scattering (SBS) is designed. By filling ethanol into the photonic crystal fiber, the effective area of photonic crystal fiber also varies with the change of refractive index of ethanol with temperature The output power of fiber is changed with the change of temperature, and the relationship between output power and temperature is numerically solved by the SBS coupled equations based on fiber. The feasibility of the new sensing mechanism is verified. Based on the new design, to reach a resolution of 1 ° C, the dynamic measurement range of the power measurement device only needs to reach 40 dB, which is much smaller than 80 dB of the frequency measurement device in the conventional measurement system. At the same time, some possible influencing factors in this system are also analyzed.