The Bendix Corporation

Michel Lamarche

Dimitri Petrov

Arthur E Maine

An acoustic fluid velocity measuring system includes mutually perpendicular arms disposed in the direction of the rectangular components of the fluid velocity, with each arm supporting two transmitting and two receiving electro-acoustic transducers. Pulses of ultrasonic energy are transmitted and received in and against the direction of fluid flow. The transducers in each arm are arranged in separate electrical loops, each of which provides an output at a different frequency. The frequencies are compared to measure fluid speed and direction which appear on a digital display. The measurements are independent of ambient temperature and the transducers are heated so that the system operates under ice forming meteorological conditions.

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Laval, Canada

Michel Lamarche