Abstract
The two-microphone sound intensity measurement technique has been used extensively over the last 10 years for the determination of sound power of noise sources, the determination and ranking of noise sources, and the sound transmission loss of structures. In this paper, theoretical expressions have been developed for the finite difference approximation errors that occur in estimating sound intensity in the interference fields of point harmonic and random dipole sources. Here, expressions have also been developed for the finite difference approximation error analysis of a simple harmonic point dipole located over a reflecting plane using the method of images. Sample calculations have been included to show the effects of the microphone separation distance, the distance of the measurement location from the source, the geometrical arrangement of the sources, the phase difference between the two point sources, and their relative strengths. These calculations suggest that increasing the microphone spacing increases the magnitude of the error level and also that the geometrical arrangement of the sources has a considerable effect on that level.
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