Abstract
A robust cantilever-based push-pull 3-component (3-C) optical fiber accelerometer is
proposed and experimentally demonstrated. Sensitivity and resonance frequency can be enhanced
simultaneously by increasing the number of turns of an optical fiber without increasing the
accelerometer size at the mass of a certain value. The calibration results show that axis
sensitivity is 45 dB (re: 0 dB = 1 rad/g), with a fluctuation less than 0.9 dB in a frequency
bandwidth of 10-450 Hz. The cross sensitivity is approximately 15 dB, with a fluctuation less than
1.2 dB in a frequency bandwidth of 10-450 Hz. The crosstalk reaches up to 30 dB. Fluctuation of the
responses of the acceleration sensitivity of different components is less than 0.7 dB over a
frequency bandwidth of 10 -450 Hz, which proves the good consistency of the 3-C optical fiber
accelerometer. By usingan all-metal structure is expected to improve the reliability of the designed
accelerometer for long-term use in harsh environments. These desirable features show that the
proposed 3-C optical fiber accelerometer is satisfactory for seismic wave monitoringin oil and gas
exploration.
© 2013 Chinese Optics Letters
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