为了实现对齿轮弯曲应力的测量，本文在分析布拉格光纤光栅(FBG)应力传感模型的基础上，提出一种齿轮弯曲应力的光纤动态测试系统设计方案。进而利用耦合模式理论对 FBG的光谱特性进行分析，并确定了用于齿轮弯曲应力测量的光纤光栅探头参数；根据齿轮弯曲应力的分布规律，对光纤探头的布置方式和光纤传输路径进行设计。然后，设计基于 F-P滤波器的光纤光栅解调系统，仿真结果验证了解调系统设计的有效性和合理性。最后，通过理论分析得出，该测量方案具有结构简单，抗电磁干扰，适合于分布式测量等特点。

In order to realize the bending stress of gear measurement, based on the analysis of Fiber Bragg Grating (FBG) strain sensing model, an optical fiber dynamic testing system design scheme of gear bending stress was put forward. And then the coupled mode theory was used to analyze the spectrum characteristics of FBG, according to which the optical fiber grating sensor parameter was determined. Based on gear bending stress distribution rule, the set of optical fiber probe and its transmission way were designed. What’s more, the fiber grating demodulation system was designed based on F-P filter. The simulation results verified the effectiveness and rationality of demodulation system. Finally, verified by theoretical analysis, the measurement scheme has the advantages of simple structure, resistance to electromagnetic interference, suitable for distributed measurement, etc.