Acoustic impedance measurements - correction for probe geometry mismatch Smith, J.R. en_US Tarnopolsky, A. en_US Wolfe, Joseph en_US Fletcher, N en_US 2021-11-25T13:09:18Z 2021-11-25T13:09:18Z 2005 en_US
dc.description.abstract The effect of evanescent mode generation, due to geometrical mismatch, in acoustic impedance measurements is investigated. The particular geometry considered is that of a impedance probe with an annular flow port and a central microphone, but the techniques are applicable to other geometries. It is found that the imaginary part of the measured impedance error is proportional to frequency, and that the sign of the error is positive for measurements made on tubes with diameter much larger than that of the inlet port,,but negative for tubes with diameter close to that of the inlet. The result is a distortion of the measured frequencies of the impedance minima of the duct while the maxima are largely unaffected. There is, in addition, a real resistive component to the error that varies approximately as the square root of the frequency. Experiment confirms the results of the analysis and calculations, and a calibration procedure is proposed that allows impedance probes that have been calibrated on a semi-infinite tube of one diameter to be employed for measurements on components with an inlet duct of some very different diameter. © 2005 Acoustical Society of America. en_US
dc.identifier.issn 0001-4966 en_US
dc.language English
dc.language.iso EN en_US
dc.rights CC BY-NC-ND 3.0 en_US
dc.rights.uri en_US
dc.source Legacy MARC en_US
dc.title Acoustic impedance measurements - correction for probe geometry mismatch en_US
dc.type Journal Article en
dcterms.accessRights metadata only access
dspace.entity.type Publication en_US
unsw.description.notePublic Author webpage: en_US
unsw.identifier.doiPublisher en_US
unsw.relation.faculty Science
unsw.relation.ispartofissue 5 en_US
unsw.relation.ispartofjournal Journal of the Acoustical Society of America en_US
unsw.relation.ispartofpagefrompageto 2889-2895 en_US
unsw.relation.ispartofvolume 117 en_US
unsw.relation.originalPublicationAffiliation Smith, J.R. en_US
unsw.relation.originalPublicationAffiliation Tarnopolsky, A. en_US
unsw.relation.originalPublicationAffiliation Wolfe, Joseph, Physics, Faculty of Science, UNSW en_US
unsw.relation.originalPublicationAffiliation Fletcher, N en_US School of Physics *
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