Abstract
For the past twenty years or so we have been using acoustic intensity to map out the surface of an object in order to have a visual representation of that noise source. More recently the trend has been to use large microphone arrays and acoustic holography. Acoustic intensity is reasonably easy to do but requires an intensity probe, a two channel analyzer some training and special software. In total the system cost can easily exceed $20,000. Acoustic holography systems provide more information but are much more expensive and need trained personnel. However, a low cost single channel SLM/RTA can be used to generate very good sound pressure contour maps that help noise control engineers understand noise sources. The other advantage is that it is simple to use requiring only an hour or less of training. Several example pressure maps will be presented and compared to acoustic intensity maps.
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