Characteristics of Fiber Bragg Grating Hydrophone

Nobuaki TAKAHASHI  Kazuto YOSHIMURA  Sumio TAKAHASHI  Kazuo IMAMURA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E83-C   No.3   pp.275-281
Publication Date: 2000/03/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Sensors)
Category: Physical and Mechanical Sensors
Keyword: 
optical fiber sensor,  fiber Bragg grating,  acousto-optics,  optical hydrophone,  underwater acoustic sensor,  wavelength division multiplexing,  

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Summary: 
Characteristics of an FBG hydrophone are described under various conditions. The developed FBG hydrophone detects an acoustic field in water with good performances: linear response,high sensitivity,high stability,wide dynamic range as large as 90 dB and wide operation frequency range from a few kHz to a few MHz. A WDM FBG hydrophone consisting of two FBGs in serial connection can detect simultaneously amplitudes and phases of acoustic fields at different points,which in turn allows a directive measurement of an acoustic field in water.