基于光纤光栅的杆型二维振动传感器

为了实现两个方向的振动信号检测，提出了一种以杆为弹性结构的二维光纤光栅振动传感器。首先对该传感器进行了理论分析，并推导出其固有频率和灵敏度公式。然后对传感器结构进行了优化仿真，确定各个参数的最终值。最后通过实验研究了传感器的各项性能。实验结果表明，该传感器在x方向上的固有频率为493 Hz,灵敏度为54 pm/g,线性度为99.9%;在y方向上的固有频率为466 Hz,灵敏度为5 pm/g,线性度为97.5%。此外，采用双光纤光栅消除了温度对振动信号测量的影响，温度灵敏度为0.1 pm/°C。该传感器结构简单，可检测两个方向的振动信号，消除了温度的影响，在振动信号检测中表现良好，因此在多维振动信号检测领域具有重要研究意义。

Two-Dimensional Rod-Shaped Vibration Sensor Based on Fiber Grating

In order to realize the vibration signal detection in two directions, a two-dimensional fiber grating vibration sensor with a rod as the elastic structure is proposed. Firstly, the theoretical analysis of this two-dimensional fiber grating vibration sensor is carried out, and the formula of its natural frequency and sensitivity is derived. Then the sensor structure is optimized and simulated to determine the final value of each parameter. Finally, the performance of the sensor is studied experimentally. The experimental results show that the natural frequency of the sensor in the x direction is 493 Hz, the sensitivity is 54 pm/g, and the linearity is 99.9%. The natural frequency in the y direction is 466 Hz, the sensitivity is 5 pm/g, and the linearity is 97.5%. In addition, the effect of temperature on vibration signal measurement is eliminated by using dual fiber grating, and the temperature sensitivity is 0.1 pm/°C. The sensor which can detect vibration signals in both directions and eliminate the influence of temperature is simple in structure. Since the sensor has good performance in the detection of vibration signals, it has important research significance in the field of multidimensional vibration signal detection.