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Fundamental standards for acoustics based on optical methods - final report.

Theobald, P; Thompson, A D; Robinson, S P; Barham, R G; Preston, R C; Lepper, P*; Swift, C*; Tyrer, J*; Greated, C*; Campbell, M*; Schlike, T*; Yuebing, W (2004) Fundamental standards for acoustics based on optical methods - final report. NPL Report. DQL-AC 001

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This report summarises the work undertaken on a project whose overall aim was to progress towards the development of fundamental standards for acoustics based on optical methods. The favoured approach for achieving this for sound in water is particle velocity measurement using heterodyne interferometry and a reflecting membrane in the acoustic field. This report focuses on the pilot facility established for this using a new ‘all-fibre’ heterodyne interferometer and a reflective membrane supported in the acoustic field. For sound in air, the adopted method is Laser Doppler Anemometry using photon-correlation analysis techniques.
This report is part of the Deliverable for the Phase Four Work Package for Project 3.6 of the NMS Quantum Metrology Programme for the UK Department of Trade and Industry. The Phase Four Work Package also included a number of other Deliverables which included the output of two journal papers and the delivery of an all-fibre heterodyne interferometer for sound in water. A total of four journal papers have been drafted and the optical measurement system is due for delivery within a month of the end of the project. The project was undertaken by a consortium of the National Physical Laboratory and Loughborough University, with Laser Optical Engineering Ltd. as a sub-contractor for the sound in water aspect of the project and University of Edinburgh, with Qinetiq as a sub-contractor for the sound in air aspect of the project. The project also benefited from a guest worker from the Hangzhou Applied Acoustics Research Institute, China.

Item Type: Report/Guide (NPL Report)
NPL Report No.: DQL-AC 001
Keywords: acoustic velocity, vibrometer, heterdyne interferometer, laser doppler anemometry
Subjects: Acoustics
Last Modified: 02 Feb 2018 13:16
URI: http://eprintspublications.npl.co.uk/id/eprint/2963

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