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Characteristics of Fiber Bragg Grating Hydrophone
Nobuaki TAKAHASHI Kazuto YOSHIMURA Sumio TAKAHASHI Kazuo IMAMURA
IEICE TRANSACTIONS on Electronics
Publication Date: 2000/03/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Sensors)
Category: Physical and Mechanical Sensors
optical fiber sensor, fiber Bragg grating, acousto-optics, optical hydrophone, underwater acoustic sensor, wavelength division multiplexing,
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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.