A novel fiber Bragg grating (FBG) accelerometer is proposed. The accelerometer is based on a compact symmetrical structure consisting of a Y-shaped beam and an FBG. The mechanical model and sensing principle of the accelerometer are well illustrated. Then, the structural parameters are numerically studied. In experiment, the measured resonant frequency is 700 Hz, and the stable working frequency range is 50 ~ 400 Hz with an average sensitivity of 57.4 pm/g. The wavelength shift of FBG is linearly related to the acceleration with linearity better than 99.9%. Moreover, temperature effect on the accelerometer is also tested. The accelerometer exhibits good dynamic performance, as well as the advantages of compact structure and easy manufacturing, making it a candidate for vibration measurement.

提出了一种新型光纤布拉格光栅（FBG）加速度计。加速度计基于由Y形梁和FBG组成的紧凑对称结构。很好地说明了加速度计的机械模型和传感原理。然后，对结构参数进行数值研究。实验中测得的谐振频率为700 Hz，稳定工作频率范围为50～400 Hz，平均灵敏度为57.4 pm/g。FBG 的波长偏移与加速度线性相关，线性度优于 99.9%。此外，还测试了温度对加速度计的影响。该加速度计表现出良好的动态性能，以及结构紧凑、易于制造的优点，使其成为振动测量的候选者。