near field

"The area less than one wavelength from a sound source. In this area pressure and particle velocity are out of phase and sound measurements are unpredictable." [1]


参照

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Engelsk

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Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith