The Spatial Transformation of Sound Fields (STSF) technique involves scanning a sound field using an array of transducers over a planar surface close to the source under investigation. From measured cross-spectra, a principal component representation of the sound field is extracted. Any power descriptor of the near-field (intensity, sound pressure, etc.) can then be investigated by means of Near-Field Acoustic Holography, while the more distant field can be determined by application of Helmholtz's Integral Equation. Application of the technique to measurements is discussed with practical examples.
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