Abstract
This paper reports a new-style all-polarization-maintaining optical fiber vector
hydrophone (OFVH) that is composed of a three-component optical fiber accelerometer and
an optical fiber hydrophone. In order to make the OFVH small and compact in volume, the
orthogonal and unitized structure of the three-component optical fiber accelerometer is
adopted. The sensitivity and the operating frequency band of the accelerometer are
increased by this proposed structure. The signal fading caused by the random phase shift
in the interferometer is eliminated by phase-generated carrier technology. Calibration
results show that the acceleration sensitivity is 32.6 dB re rad/g and its fluctuation
is less than 1.4 dB over the frequency range of 20–2000 Hz. The phase sensitivity of the
optical fiber accelerometer is -155 dB re rad/μPa at 1000 Hz. This OFVH has an
excellent directivity; its maximum asymmetric index is less than 0.4 dB and its
directivity index is greater than 45dB. The excellent performance of this new-style OFVH
for use in source localization measurements is also proved by the sea trial.
© 2011 IEEE
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