Sound Fields

  • John E. K. Foreman


In making sound pressure measurement, the effects of reflected sound must be considered. If the measurements are made very close to the source, however, the incident sound will predominate. Reflections will also occur off objects within the room as well as the walls. If a sound is produced at one point in the room and then stopped, the waves will reflect off various surfaces in a manner similar to light. With no surface absorption reflections would, theoretically, continue indefinitely. However, the movement of air particles converts some of the energy into heat by viscous action and heat conduction and also by the effects of molecular absorption and dispersion involving an exchange of translational and vibrational energy between colliding molecules (1); in addition, energy is absorbed by the reflecting material surface. Attenuation and decay of the reflections thus results.


Sound Pressure Sound Wave Noise Source Line Source Sound Field 
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Copyright information

© Van Nostrand Reinhold 1990

Authors and Affiliations

  • John E. K. Foreman
    • 1
  1. 1.Sound and Vibration LaboratoryThe University of Western OntarioLondonCanada

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