A New Style of FBG Vibration Sensor

A new style of FBG vibration sensor with a special structure of metal three-legged stand and elastic cantilever is designed for many low-frequency tests of engineering structures and mechanical systems. It can work with a wide band, zoom in vibrating signal and increase sensitivity. And mathematical model of vibration sensor is established. Furthermore, natural frequency, sensitivity, distortion factor, horizontal anti-jamming capability of sensor were measured. Experimental results show that to detect vibrations below 75Hz is entirely feasible, with FBG vibration sensor designed. And its natural frequency is about 100 HZ, frequency range is 75 Hz, the resolution of amplitude is 0.3 nm/mm, sensitivity is 28.5 pm/m.s -2 .

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