A suggestion to repeatability assessment in random incidence sound absorption measurements

Overview & Synopsis

In recent years, efforts to increase comparability in random incidence sound absorption measurements have been studied in relation to updating of ISO 354. New and faster measurement setups have improved efficiency in laboratories. These setups also give the possibility to make more measurements on the same sample without much more effort. The uncertainty related to the repeatability in laboratories can hereby potentially be improved. Using combinations of multiple empty room measurements and multiple measurements with a sample, a range of results for &ₐlpha;_s, &ₐlpha;_p, and &ₐlpha;_w for exactly the same sample can be reached. This holds a potential in research for dealing with the influence from pure measurement randomness. A look into this is presented.