The optical fiber accelerometer owns exceptional advantages in various industrial applications due to its high sensitivity,
immunity to electromagnetic interference, small size, low cost and easy to form sensor network etc. This study aims to
evaluate an optimized interferometric optical fiber accelerometer based on Michelson structure. An integral parameter S
was firstly proposed to assess the general performance of the accelerometer including both the sensitivity and resonance
frequency, the compliant cylinder of the accelerometer proposed in this study was optimized as the composite structure
materials, two typical sensitivity enhanced elastic materials of polycarbonate and silicone rubber were selected. This new
type accelerometer was capable to provide higher phase sensitivity and wider flat bandwidth with optimized proportional
mixing between two materials. The comparison analysis of Young’s modulus and Poisson ratio on the promotion of integral
parameter S was finally discussed.
In this paper, a new scheme for delay parameters measurement in time division multiplexing (TDM) fiber optic interferometric sensor (FOIS) network is proposed. This scheme provides a solution of delay parameters measurement through the variance vector of the reshaped original data. By calculating the correlation between the variance vector and the system's pulse template vector, the scheme is capable to resist much more noise in the original data. Even when the SNR of the original data decreases to 7 dB, the scheme can still work with a correct rate higher than 98%. What's more, the scheme is feasible to be carried out, and it is able to work real-time.
In this paper, we propose a new type of push-pull structure fiber optic accelerometer based on 3×3 coupler for the first time and carried out measurements of its responsivity and cross-axis sensitivity. With specific algorithm, the phase signal of the sensor can be extracted without complicated modulation and demodulation. Experiments show that the responsivity of the accelerometer is larger than 40dB (0dB ref 1rad/g) within the frequency band from 10Hz to 800Hz, which agrees well with the theoretical analysis. In addition, the cross-axis sensitivity can be optimized as low as about -30dB due to the push-pull structure. The results reported here indicate that this type of fiber optic accelerometer can be applied in vibration sensing such as micro seismic monitoring.
This paper reports a new optical fiber accelerometer which is suitable for heterodyne demodulation method. Dual low reflectivity polarization-maintaining FBG is used to form the interferometer inside accelerometer, simplify the structure of traditional interferometer and eliminate polarization fading. The resonance frequency and the sensitivity of the accelerometer are predicted by using micro-element analysis. The experimental results showed that the accelerometer’s sensitivity is more than 40 dB re rad/g, and the bandwidth is wider than 1.2 kHz. This type of optical fiber accelerometer can be widely used in acceleration sensing system which requires both high sensitivity and wide bandwidth.