Ultrasonic gas flow measurement method and apparatus

Details Ultrasonic gas flow measurement method and apparatus Ultrasonic gas flow measurement method and apparatus

1991-08-01

1994-01-11

Chilcot, Jr., Richard E.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386127, G01H 500

Patent

active

052770702

ABSTRACT:
A transit time gas flow meter comprising a pair of transducers mounted at an oblique angle to gas flow in a duct for measuring the transit time of an ultrasonic pulse in both directions between the transducers and computer determines the difference between transit times as a measure of the velocity of a gas stream flowing in the duct. Each transducer is carried in a mounting assembly which is comprised of a U-shaped frame member having a base and leg members and an ultrasonic reflection surface formed on the base of U-shaped frame member. A transducer is mounted between said legs and at a predetermined oblique angle to said reflection surface. A reference target carried on the U-shaped frame member is positioned at the edge of said gas and the ultrasonic transit time to each said reference target is subtracted by the computer means from the transit times from each of transducer to the other transducer, respectively, to zero flow calibrate transit time flow meter and to improve the accuracy measurements.

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