✦ LIBER ✦

Measuring the acoustic properties of ducts

✍ Scribed by T.E. Vigran

Publisher: Elsevier Science
Year: 1985
Tongue: English
Weight: 369 KB
Volume: 18
Category: Article
ISSN: 0003-682X
DOI: 10.1016/0003-682x(85)90009-x

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✦ Synopsis

S UMMA R Y

A short review, with examples, is given of a two-microphone transfer function method intended for making measurements in a tube or duct system. The method, originally proposed by Chung and Blaser, 1 has proved useful in measuring the absorption coefficient, impedance and transmission loss, when dealing with plane wave propagation, i.e. for frequencies below the duct cut-off frequency. For the purpose of measuring the transmission loss of duct elements, a possible means of extending the useful frequency range by two or three octaves is proposed, based on subdividing the actual duct, at the measurement site, into a bundle of smaller, parallel ducts.

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