Published in Journal of Aircraft, Volume 44, Issue 3, May 1, 2007, pages 726-732.
Reprinted with permission of the American Institute of Aeronautics and Astronautics, Inc. Publisher website: http://www.aiaa.org/content.cfm?pageid=2.
NOTE: At the time of publication, the author William Durgin was not yet affiliated with Cal Poly.
The definitive version is available at http://dx.doi.org/10.2514/1.25060.
This paper describes the experimental proof of concept study for an ultrasonic method of wake vortex detection. This new acoustic method uses travel time of acoustic pulses around a closed path to measure the net circulation within the acoustic path. In this application the closed path encloses the vorticity shed from one side of a Piper PA-28 aircraft wing. Magnitude and sign of circulation detected is comparable to the expected circulation generated by the Piper PA-28 test aircraft. This study demonstrates the validity of the acoustic method in detecting aircraft wake vortices. Further investigations and applications using this technique are discussed.