Title
Absorption measurement of acoustic materials using a scanning laser Doppler vibrometer Absorption measurement of acoustic materials using a scanning laser Doppler vibrometer
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
New York, N.Y. ,
Subject
Engineering sciences. Technology
Source (journal)
The journal of the Acoustical Society of America. - New York, N.Y.
Volume/pages
117(2005) :31 , p. 1168-1172
ISSN
0001-4966
ISI
000227574700019
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
In this article a method is proposed to estimate the normal incidence reflection ratio and absorption coefficient of acoustical materials using measurements in a transparent tube excited with a loudspeaker and terminated with the material under investigation. The waveforms are measured at different locations in the tube using a scanning laser Doppler vibrometer. Because the measurement probe (i.e., the laser beam) does not interfere with the wave in the tube, narrow tubes can be used. This means that-in contrast to the standardized wide tube tests using microphones-the proposed experiment could be used for high frequencies (in the paper an 8 mm tube was used, resulting in a 25 kHz upper frequency limit). It is shown based on theoretically known scenarios (i.e., an open tube and a rigid termination) that the absorption coefficient can be obtained with an error of about three percent. In addition, the absorption coefficient of two commonly used absorption materials-glass fiber wool and carpet-were determined and found to be in good agreement with material databases. (c) 2005 Acoustical Society of America.
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