Measurement of Absorption Loss at 80 kHz Band for Wideband Underwater Acoustic Communication

概要

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To achieve high-speed acoustic data transmission, the use of a frequency band of $80\pm 20$ kHz is being considered. However, the absorption attenuation coefficient in these frequencies only has empirical formula. Therefore, the absorption attenuation was measured using the frequency of 60 to 100 kHz within the propagation distance of 250 to 510 m at a 1,000 m depth. The transmission signal wave form was measured with conductivity, temperature, and depth (CTD) data. From these measured data, the absorption attenuation coefficient was calculated using several empirical equations. As a result, a corresponding comparatively good for the empirical formula of Francois and Garrison.
2008-05-25