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Sound Power Determination

Sound Power as a Preferred Quantity Measure

When determining noise emissions for products, sound power is the preferred quantity to measure because it describes the absolute power of the noise source independently from the acoustic environment.

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Sound Power Determination

Three Main methods of Determination

  • Free-field – placing the source in an acoustically open area (free-field) and determining its sound power from sound pressure measurements.
  • Reverberation room – placing the source in a reverberation room (diffuse sound-field) and determining its sound power from sound pressure measurements.
  • Sound intensity – measuring sound intensity from the source directly in any sound field to determine the sound power.

The sound pressure-based methods are most often used for production audits and high volume testing, while sound intensity-based methods are used for engineering and in situ measurements

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Sound Power Determination

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