High-sensitivity dual-disk fiber-optic vibration sensing with wideband flattened response

The sensitivity and resonant frequency of the fiber-optic accelerometer are contradictory, both being limited by the sensor's size and mechanical parameters. This paper presents a dual-disk structure that incorporates liquid damping, enabling the adjustment of the system's damping ratio. This approach effectively suppresses the resonance peak and flattens the amplitude-frequency response. Experimental results show that the sensor's resonance peak is effectively suppressed, with a working bandwidth of up to 329 Hz, a sensitivity of 17,722 rad/g, and a theoretical resolution of 0.38 ng/√Hz@10 Hz.