Abstract
This article investigates numerically several sources of errors associated with the measurement of acoustic impedance using the two-microphone method in a free field. This method is based on the evaluation of the acoustic velocity from the pressure gradient. For impedance measurement, the finite approximation, phase mismatch, effective microphone separation, and probe localization errors are analyzed. Once it is known how to calculate the exact impedance above an absorbing plane, the influence of the assumed wave propagation type on the calculation of the material impedance is then investigated. Finally, an example of the useful range of validity of the method is presented.
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