Interlaboratory comparisons’ measurement uncertainty in the field of environmental noise

Abstract

This paper deals with the problem of measurement uncertainty in acoustic measurements regarding the results of interlaboratory comparison (ILC). The measurement results of ILC in the field of environmental noise have been analysed taking into account the proposed methods for standard deviations’ calculation in repeatability and reproducibility conditions. In the field of environmental noise measurements of point sound source, the measurement results as well as the precision and accuracy are discussed bearing in mind the microphone positions. The results for expanded measurement uncertainty calculations are obtained following the ISO 1996-2:2007 and ISO 1996-2017 Standard. The obtained results showed that expanded measurement uncertainty from interlaboratory comparison results calculated from probability density functions is considerably less when compared with the procedure in Standards. A good agreement is gained for the difference between A-weighted level and spectral values from logarithmically averaged measurement results on the reflection surface and close to the reflection surface.