Abstract
An optical fiber hydrophone based on equivalent phase shift fiber Bragg grating (EPS-FBG) with temperature compensation package provides an improvement of sensitivity in underwater acoustic measurement at wide frequency range, from 2.5 kHz to 12 kHz. The acoustic pressure is transduced into elastic vibration of a circle metal disk, resulting in an intensity modulation of the reflected light wave back from fiber Bragg grating (FBG). Experiment shows that the packaged EPS-FBG hydrophone has a minimum detectable acoustic pressure of about 500 Open image in new window at 5 kHz and achieves about 18-dB improvement of acoustic pressure sensitivity compared with a regular apodized FBG hydrophone.
Highlights
There exists a great demand for measurement of underwater acoustic signal in many applications, e.g. constructions, geophysical and military fields [1,2]
An optical fiber hydrophone based on equivalent phase shift fiber Bragg grating (EPS-FBG) with temperature compensation package provides an improvement of sensitivity in underwater acoustic measurement at wide frequency range, from 2.5 kHz to 12 kHz
Experiment shows that the packaged EPS-FBG hydrophone has a minimum detectable acoustic pressure of about 500 μPa/ Hz at 5 kHz and achieves about 18-dB improvement of acoustic pressure sensitivity compared with a regular apodized FBG hydrophone
Summary
There exists a great demand for measurement of underwater acoustic signal in many applications, e.g. constructions, geophysical and military fields [1,2]. The operating principle of FBG-based hydrophone is typically based on intensity modulation of light wave, caused by instant change of the transmission spectrum of sensor under the influence of acoustic field [12]. Low sensitivity to acoustic pressure will cause that FBGs seemingly may not satisfy the high sensitivity requirement of hydrophones [13]. A kind of simplified hydrophone package structure with improved sensitivity, good linearity, and isotropic directivity is proposed based on equivalent phase shift fiber Bragg grating (EPS-FBG).
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