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Miniature photonic-crystal hydrophone optimized for ocean acoustics | | Onur Kilic
; Michel J. F. Digonnet
; Gordon S. Kino
; Olav Solgaard
; | | Date: |
Fri, 16 Apr 2010 01:30:11 GMT (1895kb) | | Abstract: | An optical hydrophone that is insensitive to hydrostatic pressure, yet
capable of measuring acoustic pressures as low as the background noise in the
ocean in a broad frequency range of 1 Hz to 100 kHz is reported. The miniature
hydrophone consists of a Fabry-Perot interferometer made of a photonic-crystal
reflector interrogated with a single-mode fiber, and is compatible with
existing fiber-optic technologies. Three sensors with different acoustic power
ranges placed within a sub-wavelength sized hydrophone head allow a high
dynamic range in the excess of 160 dB with a low harmonic distortion of better
than -30 dB. A method for suppressing cross coupling between sensors in the
same hydrophone head is also proposed. A prototype was fabricated, assembled,
and tested. The sensitivity was measured from 100 Hz to 100 kHz, demonstrating
a minimum detectable pressure down to 11 muPa (1-Hz bandwidth), a flatband
wider than 10 kHz, and very low distortion. | | Source: | arXiv, 1004.2742 | | Services: | Forum | Review | PDF | Favorites | |
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