Abstract
The in-duct two-microphone method of Chung and Blaser is extended to include measurement of acoustic energy density. General transform relations are established between the sound pressure auto- and cross-spectral densities measured by using a two-microphone probe and the corresponding sound pressure data for the forward- and the backward-travelling wave components. From these relations formulas for the potential and kinetic energy density are derived for the special case of no flow. A field index F is proposed; it is the ratio between the net intensity and an apparent intensity represented by Ec 0, where E is the total energy density and c 0 the sound speed. The usefulness of the proposed index as a field indicator is demonstrated by measurements in the near field of a junction between two tubes of different cross-section.
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