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Visualization of acoustic intensity vector fields using scanning measurement techniques

Fernandez Comesana, Daniel, Tijs, Emiel, Cats, Peter and Cook, Douglas (2013) Visualization of acoustic intensity vector fields using scanning measurement techniques At Internoise 2013, Austria. 15 - 18 Sep 2013.

Record type: Conference or Workshop Item (Poster)

Abstract

Sound propagation paths are not always well understood mainly because of the complex nature of the source or the environment. A direct method to capture the sound energy flow throughout a room is to measure the three-dimensional sound intensity distribution across space. In the past years, several studies have been carried out using step by step measurements with a three-dimensional intensity probe consisting of a sound pressure transducer and three orthogonal particle velocity sensors. The probe’s ability to measure even in highly reverberant environments and its small size are key features required for numerous applications. However, punctual measurements are time-consuming, especially when a large number of measurement positions are evaluated. The use of advanced scanning measurement techniques, such Scan & Paint, allows for the gathering of data across a time stationary sound field in a fast and efficient way, using a single sensor and webcam only. The acoustic signals are acquired manually by moving a probe across a measurement plane whilst filming the event with a camera. In the post-processing stage, the sensor position is extracted and then used for linking a segment of the signal acquired to a certain position of the space. In this manner, the overall measurement time is reduced from hours to minutes. In this paper, the acoustic intensity vector fields of several complex examples are investigated; revealing the acoustic energy flow of several vehicles, a loudspeaker in a room, and also the interaction between an absorbing sample and a reverberant sound field.

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More information

Published date: 16 September 2013
Venue - Dates: Internoise 2013, Austria, 2013-09-15 - 2013-09-18
Organisations: Acoustics Group

Identifiers

Local EPrints ID: 357181
URI: http://eprints.soton.ac.uk/id/eprint/357181
PURE UUID: f3efdbe4-7e55-4758-8837-1932e0bb6fb0

Catalogue record

Date deposited: 15 Oct 2013 13:42
Last modified: 18 Jul 2017 03:34

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Contributors

Author: Daniel Fernandez Comesana
Author: Emiel Tijs
Author: Peter Cats
Author: Douglas Cook

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