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The problem of offset in acoustic pulse reflectometry

Sharp, David B. and Li, Aijun (2007). The problem of offset in acoustic pulse reflectometry. In: Proceedings of International Symposium on Musical Acoustics 2007, 9-12 Sept 2007, Barcelona, Spain, pp. 789–796.

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Abstract

Acoustic pulse reflectometry has become established as a useful non-invasive technique for measuring a variety of duct properties. A sound pulse is injected into the duct under investigation and the resultant reflections are recorded. Suitable analysis of the reflections yields the input impulse response of the duct, from which both its input impedance and its internal dimensions can be calculated. However, an input impulse response measurement made using acoustic pulse reflectometry generally contains an offset. Unless this offset is removed, the application of a bore reconstruction algorithm results in a calculated duct profile which expands or contracts spuriously.
In this paper, the offset in an input impulse response measurement is shown to consist of both constant and time-varying components. Methods of preventing or removing these DC and time-varying offsets are proposed and subsequent improvements to the bore reconstruction accuracy are demonstrated.

Item Type: Conference Item
Copyright Holders: 2007 The Authors
Extra Information: Proceedings CDROM publication details: ISBN: 9788493414214
Academic Unit/Department: Mathematics, Computing and Technology > Engineering & Innovation
Item ID: 18717
Depositing User: David Sharp
Date Deposited: 22 Oct 2009 15:08
Last Modified: 07 Dec 2010 05:07
URI: http://oro.open.ac.uk/id/eprint/18717
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