N2 - Sound absorption coefficient is a commonly used parameter to characterize the acoustic properties of sound absorbing materials. It is defined within the frequency range of 100-5 000 Hz. In the industrial conditions, many appliances radiating acoustic energy of the frequency range of above 5000 Hz are used and at the same time it is known that a noise within the frequency range of 5 000-50 000 Hz can have a harmful effect on people,hence there is a need to define the coefficient in this frequency range. The article presents a proposal for a method of measurement of the sound absorption coefficient of materials in the frequency range from 5 000 Hz to 50 000 Hz. This method is a modification of the reverberation method with the use of interrupted noise. L1 - http://www.czasopisma.pan.pl/Content/101515/PDF/04-paper.pdf L2 - http://www.czasopisma.pan.pl/Content/101515 PY - 2013 IS - No 2 EP - 183 DO - 10.2478/aoa-2013-0020 KW - ultrasonic noise KW - sound absorption coefficient of materials A1 - Mikulski, Witold PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 38 DA - 2013 T1 - Method of Determining the Sound Absorbing Coefficient of Materials within the Frequency Range of 5 000–50 000 Hz in a Test Chamber of a Volume of about 2 m3 SP - 177 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/101515 T2 - Archives of Acoustics