Measuring Directional Velocity in Water Waves with an Acoustic Flowmeter

摘要

The report contains the technical details of an investigation which was undertaken to adapt an acoustical flowmeter to a device for measuring velocities in water-wave phenomena. The flowmeter studied was designed to measure the difference in travel times of two acoustical pulses traveling simultaneously in opposite directions along a common path. Because of viscous effects, a zone of low velocity flow occurs behind each probe and the measured velocity is somewhat less than the actual velocity when the angle between the acoustical path and velocity vector, theta, is small. (Author)