Sharp, David B. and Li, Aijun
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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
Mathematics, Computing and Technology
|Depositing User:||David Sharp|
|Date Deposited:||22 Oct 2009 15:08|
|Last Modified:||17 Jan 2016 08:37|
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The problem of offset in measurements made using acoustic pulse reflectometry. (deposited 21 Oct 2009 13:00)
- The problem of offset in acoustic pulse reflectometry. (deposited 22 Oct 2009 15:08) [Currently Displayed]