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The provision of standards for underwater acoustics at simulated ocean conditions by use of the NPL Acoustic Pressure Vessel.

Beamiss, G A; Hayman, G; Robinson, S P (2001) The provision of standards for underwater acoustics at simulated ocean conditions by use of the NPL Acoustic Pressure Vessel. NPL Report. CMAM 76

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Abstract

In this report, a description is given of the work to provide standards for underwater acoustics at simulated ocean conditions in the UK. This has been achieved by the establishment of the NPL Acoustic Pressure Vessel (APV) which enables acoustic measurements to be made at hydrostatic pressures of up to just under 7 MPa (equivalent to about 700 m of water depth) and at water temperatures ranging from 2 ºC to 35 ºC. A description is given of work required for the commissioning of the APV. A full technical specification of the facility is also provided.
Also described are some of the measurements undertaken in the APV. These include absolute calibrations of hydrophones and projectors, and measurements of transducer impedance and directional response. Using the APV, each of these parameters may be determined as a function of water temperature and hydrostatic pressure. The results of the initial testing of some commercially available transducer response with environmental conditions.
Finally, a discussion is presented of some of the current limitations of the facility and the proposed future work to improve its capability is described.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMAM 76
Subjects: Acoustics
Acoustics > Underwater Acoustics
Last Modified: 02 Feb 2018 13:17
URI: http://eprintspublications.npl.co.uk/id/eprint/2094

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