Abstract
A great deal of effort was devoted in recent years to improve the accuracy of the reverberation chamber method for sound power measurements of small sources. The paper summarizes the results achieved. The accuracy problems exist in two areas. The actual radiation of sound power as related to the power radiated into the free field. This ratio is a function of source position and source size as well as the radiation pattern of the source. Quite recently the statistics of the power radiation for a monopole source has been found (R. Waterhouse). Another area affecting the accuracy of measurements is the determination of the time-space average of pressure squared. For this purpose, various means, primarily the rotating diffusers, have been employed. The recent results on the effect of rotating diffusers on the statistical properties of the sound field is presented. Finally, suggestions for future development are given.
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