Measurement of Sound Intensity and Sound Power
MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
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In this report the concept of a measurement technique for calculating sound intensity in the frequency domain is discussed and also how such a measurement system can be implemented in practice by using a frequency domain analyser. The technique described employs a dual-channel FFT analyser to obtain a cross power spectrum from the two microphones from which sound intensity is calculated. This approach enables a general-purpose FFT analyser together with a micro-computer to perform the function of a dedicated sound intensity analyser. The application of sound intensity measurement technique in sound power determination of a reference Source is presented.