An improved tube method for acoustic impedance measurement

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TypeArticle
Journal titleBuilding Research Note
ISSN0701-5232
Volume113
Pages9
Subjectacoustic impedance; measuring instruments; Acoustics
AbstractThe tube method for specific acoustic impedance measurements is well known. In this report an iterative scheme is presented that is based on the exact plane-wave analysis of the standing-wave pattern in the tube. To use the method in its proposed format, the tube attenuation coefficient is assumed known either from theoretical prediction or prior experimental determination. The speed of sound can be calculated if the temperature of the air in the tube is measured. Alternatively, the wavelength can be measured directly by measuring the distance between two minima in the tube. Two sound pressure measurements, at the minimum and one other point, are then all that is required.
Publication date
LanguageEnglish
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
IdentifierBRN-113
NRC number1654
NPARC number20377314
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Record identifier6278aa96-6f69-47f3-aa3a-001fe4798732
Record created2012-07-24
Record modified2016-05-09
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