A novel short fiber Bragg grating accelerometer based on a V-type dual mass block structure for low- and medium-frequency vibration measurements

A novel short fiber Bragg grating (FBG) accelerometer based on a dual mass block structure is presented in this paper. The sensor is established on a solid, symmetrical design comprising a V-type beam. The configuration in the FBG accelerometer causes the FBG fiber to distort twice as much when subjected to external vibration. The theoretical research and optimization of the FBG accelerometer's natural frequency and sensitivity are performed using MATLAB software, while static structural stress and modal simulation analysis are examined using ANSYS software. An experimental test is applied to evaluate the implementation of the sensors. The natural frequency of the sensor is 880 Hz, and its stability frequency response is flat in the 20-340 Hz low-to middle-frequency range. The linearity of the average sensitivity is approximately 66.95 pm/g, and the transverse anti-interference of the FBG fiber is around 6.53%. This work proposes a suitable method to observe low-and medium-frequency vi-bration signals in large-scale applications.

Automated summary

This paper presents a novel short fiber Bragg grating (FBG) accelerometer based on a dual mass block structure. The sensor is established on a solid, symmetrical design comprising a V-type beam. The FBG accelerometer configuration causes the FBG fiber to distort twice as much when subjected to external vibration. Theoretical research and optimization of the sensor's natural frequency and sensitivity are performed using MATLAB software, while static structural stress and modal simulation analysis are examined using ANSYS software. An experimental test is conducted to evaluate the sensor's implementation. The sensor has a natural frequency of 880 Hz, with a flat stability frequency response in the 20-340 Hz low-to-middle frequency range. The average sensitivity shows a linearity of approximately 66.95 pm/g, and the transverse anti-interference of the FBG fiber is around 6.53%. This work proposes a suitable method to observe low-and medium-frequency vibration signals in large-scale applications.