设计了一种基于啁啾光纤布拉格光栅的新型加速度传感器,该传感器主要由矩形悬臂梁构成的传感机构和光纤光谱仪及光电探测器组成.导出了啁啾光纤布拉格光栅的反射谱带宽与加速度的关系;通过光谱仪检测啁啾光纤布拉格光栅反射谱的带宽或检测光电探测器输出的电压,即可获得加速度的大小.实验结果表明,该啁啾光纤布拉格光栅反射谱带宽及光电探测器输出的电压对温度变化不敏感,且在0~700 m/s2测量范围内,反射谱带宽与加速度间具有良好的线性关系.由于反射谱带宽展宽造成了光纤布拉格光栅反射率的降低,因此光电探测器输出电压的线性响应范围只能达到0~35 m/s2,带宽和电压灵敏度分别达到0.005 6 nm·m-1·s-2和0.785 6 m V·m-1·s-2.

A novel acceleration sensor based on a chirped-fiber Bragg grating( CFBG) has been proposed.It is mainly constituted by a rectangular cantilever beam sensing mechanism,a fiber optic spectrometer and a photodetector(PD).The expression of relationship between the acceleration and the bandwidth is derived.The acceleration can be obtained by measuring the bandwidth and voltage of the PD.The experimental results show that the reflection spectrum bandwidth and voltage of the PD are insensitive to temperature changes within the measuring range,there is a good linear relationship between the bandwidth of the reflection spectrum and the measured acceleration within a large range up to 0~700 m/s2,but the reflected optical power succeeds only below 350 m/s2 due to the decay in reflectivity when the bandwidth of the FBG is broadened significantly.The achieved sensitivities are 0.005 6 nm·m-1·s-2 and 0.785 6 mV·m-1·s-2 for bandwidth and optical power measurements,respectively.