@ARTICLE{Pleban_Dariusz_Method_2013,
 author={Pleban, Dariusz},
 volume={vol. 38},
 number={No 2},
 journal={Archives of Acoustics},
 pages={191-195},
 howpublished={online},
 year={2013},
 publisher={Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics},
 abstract={Efficient ultrasonic noise reduction by using enclosures requires the knowledge of absorbing properties of materials in the frequency range above 4 kHz. However, standardized methods enable determination of absorption coefficients of materials in the frequency range up to 4 kHz. For this reason, it is proposed to carry out measurements of the sound absorption properties of materials in the free field by means of a tone-burst technique in the frequency range from 4 kHz to 40 kHz at angles of incidence varying from 0° to 60°. The absorption coefficient of a material is calculated from the reflection coefficient obtained by reflecting a tone-burst from both a perfectly reflecting panel and a combination of this panel and the sample of the tested material. The tests results show that mineral wool and polyurethane open-cell foam possess very good absorbing properties in this frequency range.},
 type={Artykuły / Articles},
 title={Method of Testing of Sound Absorption Properties of Materials Intended for Ultrasonic Noise Protection},
 URL={http://www.journals.pan.pl/Content/101517/PDF/06-paper.pdf},
 doi={10.2478/aoa-2013-0022},
 keywords={ultrasonic noise, sound absorption coefficient, tone burst technique, sound absorbing material},
}