基于光时域反射技术及瑞利散射,构建全自动控制的高精度力-光耦合试验系统,进行了分布式光纤传感器裂缝传感模型试验,研究了混凝土模型力-光本构关系,试验中组合传感光纤初始感知缝宽达0.1mm,光纤传感动态范围达5.3mm,定位精度达到0.2m,并根据试验数据拟合出半经验公式。 Based on optical time-domain reflectometry and Rayleigh scattering, a fully automatic control system of high-precision force-optical coupling was constructed. The crack sensing model test of distributed optical fiber sensor was carried out. The force-optical constitutive relationship of concrete model was studied. The initial sensing aperture of combination sensing fiber is 0.1mm, the dynamic range of optical fiber sensing is 5.3mm, the positioning accuracy is 0.2m, and the semi-empirical formula is fitted according to the experimental data.