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40 dB，远小于传统测量系统中频率测量设备的80 dB。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 fiber distributed temperature sensor has the shortcoming of low precision and expensive equipments. New distributed temperature sensor based on stimulated Brillouin scattering (SBS) is designed by filling alcohol in photonic crystal fiber (PCF). Since the refractive index of alcohol varies with temperature, which results in the effective mode area of PCF varying with temperature, the output power of pulse in fiber varies with temperature. The coupled amplitude equations of SBS in optical fiber are solved numerically. And the relations between output power and temperature are obtained. The possibility of new sensing mechanism is proved. In order to achieve a precision of 1 ℃ for the new design, the dynamic range of power measurement equipment is only 40 dB, which is far less than that of frequency measurement equipment in traditional measurement system. Some influence factors in the new system are also analyzed.