United States Patent Number: 6,062,076, May 16, 2000. 10 pages. Also available from the United States Patent and Trademark Office. Website: http://www.uspto.gov
NOTE: At the time of publication, the author William Durgin was not yet affiliated with Cal Poly.
Two techniques for detecting vortices and their associated circulation are disclosed. The first is termed a closed path configuration, and the second is termed the dual path configuration. These techniques are useable for the detection of wake turbulence especially in the vicinity of airport runways, which results from wing tip vortices generated by aircraft during take-off and landing. The systems are similar in that they use ultrasonic measurement techniques to determine the circulation about defined areas. The circulation is reflective of the vorticity associated with trailing vortices, which are manifest within the area.