Sensitivity and resonance frequency evaluations for a cantilever type hetero-core fiber optic accelerometer

This paper proposes a novel cantilever-type fiber accelerometer using a hetero-core fiber optic sensor for a compact and environmental diagnosis sensing. The developed sensing scheme is immune to electromagnetic interference and cost-effective due to the intensity-based principle. The proposed accelerometer is based on a cantilever-type hetero-core optical fiber beam to detect acceleration via deflection given on the cantilever beam including a hetero-core sensory portion. Vibration responses have been investigated from a series of experiments in which the resonance frequency and sensitivity were arbitrarily changed from 400 to 1980 Hz and from 7.1 × 10 ^-2 to 1.1 × 10 ^-1 dB/g, respectively, by changing the fiber beam length. The amplitude of optical loss linearly increased with the amplitude of input acceleration up to 2.8 g.