Correction of Absorption Coefficient in Computer Modeling of Sound Fields

The standard absorption coefficient measured in reverberation chamber is usually employed to characterize the absorbing surfaces in computer modeling of sound fields. The measurement of absorption coefficient is based on the assume that the sound field in reverberation chamber is fully diffused, however this will lead to uncertainty of absorption coefficient when sample is arranged in reverberation chamber. A relationship between absorption coefficient of sample and reverberation time is proposed and applied to correct the standard absorption coefficient. The comparison with in-situ measurement shows that the corrected absorption coefficient can improve calculation accuracy of reverberation time in computer modeling.