Fiber Bragg grating (FBG) acceleration sensor is an important branch of FBG application and has irreplaceable advantages compared with an electronic accelerometer. An FBG acceleration sensor with high sensitivity and high natural frequency is designed. This sensor adopts a double cantilever structure to sense the vibration perpendicular to the axis. Compared with a single cantilever structure, the natural frequency is increased without reducing the sensing length. Through the above structure design and material selection, the sensor shows a high natural frequency of 8658 Hz and its sensitivity is 0.44 pm/g. After the photoelectric demodulation is used, the sensitivity is 52 mV/g and the linearity is 0.998. Through the experiment and simulation analysis, the sensor performs good anti-interference in the transverse direction and temperature compensation in the process of vibration measurement. The system is very small due to the use of light intensity demodulation technology, which is conducive to application and integration in actual measurement scenarios.

中文翻译：

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基于光纤光栅的高频加速度传感器

光纤布拉格光栅（FBG）加速度传感器是FBG应用的重要分支，与电子加速度计相比具有不可替代的优势。设计了具有高灵敏度和高固有频率的FBG加速度传感器。该传感器采用双悬臂结构以感应垂直于轴的振动。与单个悬臂结构相比，固有频率增加了而不会减小感测长度。通过上述结构设计和材料选择，该传感器显示出8658 Hz的高固有频率，其灵敏度为0.44 pm / g。使用光电解调后，灵敏度为52 mV / g，线性度为0.998。通过实验和仿真分析，在振动测量过程中，该传感器在横向方向上具有良好的抗干扰性，并具有温度补偿功能。由于使用了光强度解调技术，因此该系统非常小，这有利于在实际测量场景中进行应用和集成。