Abstract
A multimicrophone method for measurement of the acoustic absorption of small material samples using impedance tubes is presented. The multimicrophone method may be implemented with actual or synthetic microphone arrays, the latter involving successive measurements and a roving microphone, and is an alternative to the two-microphone method of ASTM E 1050. The effects of absorption measurement inaccuracy due to microphone response (magnitude and phase) bias and measurement noise are determined by simulation. Simulation results indicate that the multimicrophone method is more robust against microphone bias and noise and is therefore more accurate than the standard method, especially as microphone counts increase, while requiring minimal additional effort and cost.
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