Abstract
In free-field reciprocity calibrations, practical considerations make a small microphone spacing desirable. For very small spacings, however, the free-field response of the microphone under test is not simply obtainable from the measurements. In this paper the effects associated with small spacings are investigated for a simple microphone (a point transducer on the surface of a hard sphere). Both theoretical and experimental results are given. The work is directed toward the determination of the minimum practical spacing consistent with the usual free-field assumptions and the formulation of corrections which will permit the use of still smaller spacings in microphone calibration.
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