Abstract
The pressure variations caused by sound waves propagating in air result in corresponding changes in the refractive index. Using TV holography, the refractive index variations caused by single-frequency sound waves in a volume surrounding the sound emitter were recorded. The recording represents a two-dimensional mapping of the integrated sound fields where the magnitude and direction of the integrated field are found by phase stepping and image processing. For a complete description of the three-dimensional field recordings of several cross sections are needed, but in many cases valuable information can be obtained by two-dimensional projections. It is demonstrated how the technique can be used to study spatial variations in the sound emission from extended sources.
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