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Hydrophone performance in sediment.

Hayman, G; Theobald, P; Rebb, G*; Robinson, S P; Humphrey, V* (2007) Hydrophone performance in sediment. In: Proceedings of the 2nd International Conference & Exhibition on "Underwater Acoustic Measurements: Technologies & Results", June 2007, Crete.

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Measurements of acoustic signals in marine sediment are often performed using hydrophones which have been designed for use in water. Typically, they are also characterised for transmit or receive sensitivity in water. When the hydrophone is submerged in a medium other than water, the sensitivity (both amplitude and phase response) of the hydrophone and the resonant characteristics can be dramatically affected due to the different acoustic impedance and the different coupling to the medium. To investigate these changes, a series of measurements of electrical impedance and receive sensitivity were performed on a hydrophone in sediment. The initial results of this investigation are presented in this paper demonstrating the change in the hydrophone characteristics when used in sediment at higher frequencies (above 40 kHz) and the factors affecting hydrophone performance in sediment are discussed.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Keywords: sediment,, hydrophone, reciprocity
Subjects: Acoustics
Acoustics > Underwater Acoustics
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/3954

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