[Back]

J. Metzger, M. Kaltenbacher:
"A comparison of measurement techniques to determine the acoustic impedance at oblique sound incidence angle";
Talk: DAGA 2015, Nürnberg; 2015-03-16 - 2015-03-19; in: "41. Jahrestagung für Akustik", M. Kaltenbacher (ed.); (2015), 780 - 783.

For the measurement of acoustic material properties as normal incidence absorption coefficient or normal specific impedance well established procedures are available because there are standardized techniques for measuring these quantities, e.g. the Kundt´s tube and a large number of in-situ approaches (see, e.g. ISO 10534-2). Furthermore, angle dependent acoustic properties like the complex reflection factor can be determined by means of several measurement techniques described in literature. In this paper, we give an overview on these in-situ measurement techniques capable of measuring acoustic properties at oblique angles as well as a comparison of these techniques. Moreover we present an in situ scanning technique using the Microflown Ultimate Sound Probe (USP) in order to determine the acoustic material properties at sound incidence of oblique angles. First results obtained by our proposed technique are shown and the measurement system is characterized.

http://publik.tuwien.ac.at/files/publik_238894.pdf