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High-Performance Compact Fiber Optic Interferometric Accelerometer Based on a Novel Push-Pull Structure
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DOI：10.1109/TIM.2024.3381299.png)
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Abstract
En 中文
We demonstrate a compact fiber optic accelerometer (FOA) utilizing a push-pull spring-mass structure with a size of 25 x 25 x 25 mm, showcasing the excellent performance of strong sensitivity, minimal self-noise, and wide dynamic range. The presented sensing probe is a Michelson interferometer (MI) that employs the 3 x 3 coupler demodulation method to extract the information of vibration. Both arms of the MI are fiber coils wrapped around a movable push-pull folding spring structure, serving as the sensing arm for detection, which results in twice the sensitivity compared to a single-sensing arm accelerometer. The theoretical design and finite-element analysis are validated experimentally, confirming that the proposed FOA demonstrates a mean sensitivity of 48.73 dB re rad/g over the frequency band of 5 Hz-1 kHz, closely matching the simulated results. It also achieves a large dynamic of 161.12 dB at 50 Hz. Noise evaluation experimental results reveal a low average noise level of 15.85 ng/Hz(1/2) of the proposed sensor, indicating that it is one of the fiber optic interferometric accelerometers with the lowest noise reported to date.
Keywords:
Optical fibers
Optical fiber sensors
Sensors
Sensitivity
Optical interferometry
Accelerometers
Probes
Fiber optic accelerometer (FOA)
finite-element method (FEM)
Michelson interferometer (MI)
push-pull structure
Journal
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