Journal
SENSORS
Volume 21, Issue 21, Pages -Publisher
MDPI
DOI: 10.3390/s21216968
Keywords
fiber Bragg grating; accelerometer; flexible hinge; vibration monitoring
Funding
- Provincial Science and Technology Innovation Strategy Project of Zhongshan [2019sdr001]
- Optical Fiber Sensing Submarine Cable System for Deep-Sea Riser Safety Monitoring [SKJC-2020-01-016]
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A novel medium-frequency accelerometer, based on fiber Bragg grating and flexible hinges, has been proposed in this paper. The differential structure doubles the sensitivity of the sensor while avoiding temperature effects. The proposed sensor shows good temperature self-compensation function and lateral anti-interference capability.
Mediumfrequency fiber Bragg grating (FBG) acceleration sensors are used in important applications in mechanical, aerospace and weapon equipment, and have strict requirements in terms of resonance frequency and sensitivity. A novel medium-frequency accelerometer, based on fiber Bragg grating and flexible hinges, is proposed in this paper. The differential structure doubles the sensitivity of the sensor while avoiding temperature effects. The structure model and principle for the sensor are introduced, the sensor's sensing characteristics are theoretically analyzed, and the structure parameters for the sensor are determined through numerical analysis. The sensing experiments show that the resonance frequency of the sensor is approximately 2800 Hz, the sensitivity is 21.8 pm/g in the flat frequency range of 50-1000 Hz, and the proposed sensor has a good temperature self-compensation function and lateral anti-interference capability.
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