阐述了利用石英晶体旋光效应实现FBG传感系统的解调原理,理论分析了石英晶体的旋光率与波长之间的变化关系。结果表明,旋光率随波长的增加逐渐减小,在834~841nm范围内近似呈线性变化。设计了双光路检测系统,对石英晶体的旋光率与波长之间的响应关系进行了验证,实验结果与理论分析一致。 The principle of demodulation of FBG sensing system by using the optical rotation effect of quartz crystal is expounded. The relationship between the optical rotation rate and the wavelength of quartz crystal is theoretically analyzed. The results show that the optical rotation rate decreases with the increase of the wavelength and changes linearly in the range of 834 ~ 841 nm. The dual optical path detection system was designed and the response relationship between the optical rotation and the wavelength of quartz crystal was verified. The experimental results are consistent with the theoretical analysis.