一种新型滑动杆式光纤光栅振动传感器研究

为了提高振动传感器对加速度信号测量的灵敏度 ,本文提出了一种新型的基于悬臂梁和滑动杆结 合的光纤光栅振动加速度传感器。详细阐述了传感器的结构和工作原理,并推导了传感器固 有频率和灵敏 度的理论公式。最后通过振动台测试了传感器的固有频率和灵敏度,并和光纤光栅仅沿光纤 轴向上受力的 实验数据进行了比较。实验结果表明,传感器频率响应曲线的平坦区域在10～38Hz之间,传感器的固有频 率为62Hz,灵敏度为52.8pm/g。与光纤光栅 仅沿光纤轴向受力的实验相比较,加速度灵敏度提高了70.8%。

Study of a novel sliding rod FBG vibration sensor

In order to improve the sensitivity of vibration sensor in the measure ment of acceleration signal,a new type of fiber Bragg grating vibration acceleration se nsor based on the combination of cantilever beam and sliding rod is presented in this paper.T he structure and working principle of the sensor are described,and the theoretical formulae of the natural frequency and sensitivity of the sensor are derived.Finally,the natura l frequency and sensitivity of the sensor are tested by vibration table.The exper imental results show that the wavelength of the fiber Bragg grating changes only in the axial direction,an d the flat area of the sensor frequency response curve is betwee n 10Hz and 38Hz. The natural frequency of the sensor is 62Hz and the sensitivity is 52.8pm/g.Co mpared with the fiber grating with force only along the axis,the acceleration s ensitivity is increased by 70.8%.