提出了一种新型的基于非均匀光纤布拉格光栅（FBG）精细谱和边沿解调的应变灵敏度增强型传感器。理论研究了在轴向非均匀应变情况下普通FBG的传输谱以及基于传输谱精细结构的应变响应特性。仿真结果表明，将均匀应变转为非均匀应变的新型传感器对应变的灵敏度为普通FBG的4.6倍。在实验上设计制作了这种可将被测物体的均匀应变转换为FBG的非均匀应变以提高应变灵敏度的传感器结构。实验测量结果证明了理论分析的可行性。这种传感器在采用窄线宽激光器的FBG边沿解调方案中具有提高动态应变响应灵敏度以及增大应变测量范围的作用，同时，由于其长度可小型化，在检测高频动态应变信号方面也有较大的应用前景。

A novel sensitivity enhanced fiber Bragg grating (FBG) strain sensor based on fine transmission spectrum and edge filter interrogator of a non-uniform FBG is proposed. The fine transmission spectrum changes of FBG under axial non-uniform strain and the strain response character based on spectrum changes are studied theoretically. The simulation results show that the strain sensitivity of the FBG under non-uniform strain can be enhanced to 4.6 times normal FBG. The sensor structure is designed and made experimentally to enhance the strain sensitivity by changing uniform strain into non-uniform strain. The experimental results are in good accordance with theoretical results. The FBG strain sensitivity and the range of the dynamic strain measurement ability are both enhanced in narrow linewidth laser locked edge filter interrogation system by using this new FBG sensor. Because of its compact size, the new FBG strain senor has great potential for high frequency dynamic strain monitoring.