Abstract
Extensive study of the sound field in the region surrounding a rigid obstacle has led to the development of a three-dimensional representation of the pressure field. The obstacle under investigation was placed in an anechoic chamber in the path of a plane acoustic wave. The sound field in a selected horizontal plane surrounding the obstacle was studied by automatically moving a small probe microphone through the region at a speed of 4 mm/sec. The signal from the probe microphone was fed to an audiofrequency spectrometer and recorded by means of a graphic level recorder. The data tapes were coordinated to construct a three-dimensional model showing the pressure amplitude as a function of two position coordinates (x and y). Models have been constructed for the sound field in the region surrounding a sphere and a cube at different frequencies. [This work was supported by a Research Grant from Temple University.]
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