Two 16-element fiber-optic seismometer arrays based on combined wavelength- and time domain multiplexing technology have been designed and investigated, followed by a field test, which is focused on the sensitivities of the sensors and correlation of the signal. The field test shows that the consistency of the sensitivities is pretty good, though the fluctuation of sensitivities at different frequencies should not be ignored. The method to calculate the correlation of two sensors is presented briefly and the results show an acceptable high level. The field test indicates that it’s available to use the arrays in practical applications of micro-seismic.
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.
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