contrapropagating ultrasonic flowmeter [¦kän·trǝ`prä·pǝ´gād·iŋ `ǝl·trǝ´sän·ik `flō´mēd·ǝr] ENGINEERING An instrument for determining the velocity of a fluid flow from the difference between the times required for high-frequency sound to travel between two transducers in opposite directions along a path having a component parallel to the flow. |