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near field

5.05  near field. The acoustic field so close to an extended source that the effects of the source size are manifest in measurements.

Annotation              For a source of extent L, the “Fresnel range” can be used to define the maximum distance for the near field: L2/λ, where λ is the wavelength of the sound.

Related Articles:
  • Standards Terms: beam axis
  • Standards Terms: average sound pressure level in a room
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Related Terms:
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  • Term: acoustic
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