Measurement of the sound absorption coefficient for an advanced undergraduate physics laboratory

被引：3
|
作者：
Macho-Stadler, E. [1 ]
Elejalde-Garcia, M. J. [1 ]
机构：
[1] Univ Basque Country, Bilbao Fac Engn, Dept Appl Phys 1, Plaza Ingeniero Torres Quevedo 1, E-48013 Bilbao, Spain
来源：
EUROPEAN JOURNAL OF PHYSICS | 2017年 / 38卷 / 05期
关键词：
sound; absorption coefficient; physics laboratory; impedance tube; acoustic insulators; ACOUSTICAL PROPERTIES;
D O I：
10.1088/1361-6404/aa78b1
中图分类号：
G40 [教育学];
学科分类号：
040101 ; 120403 ;
摘要：
We present a simple experiment that allows advanced undergraduates to learn the basics of the acoustic properties of materials. The impedance tube-standing wave method is applied to study the normal absorption coefficient of acoustics insulators. The setup includes a tube, a speaker, a microphone, a digital function generator and an oscilloscope, material available in an undergraduate laboratory. Results of the change of the absorption coefficient with the frequency, the sample thickness and the sample density are analysed and compared with those obtained with a commercial system.
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页数：14
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