American Journal of Physics
The acoustic intensity vector field around a tuning fork is investigated. Theory for a longitudinal quadrupole source predicts a well-defined transition between near-field and far-field, with significant circulation of sound energy in the near-field. Vector components of the time-averaged intensity were measured using a two-microphone intensity probe and found to agree well with predictions from theory. The vector intensity map is interpreted, and shown to provide useful information about the near-field of an acoustic source.
© 2013 American Journal of Physics, posted with permission
Russell, Daniel A.; Junell, Justin; and Ludwigsen, Daniel O., "Vector Acoustic Intensity Around a Tuning Fork" (2013). Physics Publications. 6.