Device for determining mass air flow in a conduit

Details Device for determining mass air flow in a conduit Device for determining mass air flow in a conduit

1975-05-20

1976-06-22

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

G01F 166

Patent

active

039643093

ABSTRACT:
An ultrasonic device for determining the air flow rate in a conduit, comprising a duct, which may form part of the conduit or may be connectable thereto, at each end of which is a respective enlarged cylindrical chamber communicating axially with the duct and housing a respective piezoelectric transducer. In use of the device the piezoelectric transducers both transmit ultrasonic signals towards each other along the duct and the air speed in the duct is determined by the difference in transit times of the ultrasonic signals in the two directions. The air flow through the chambers is largely radial and the piezoelectric transducers are located axially at positions where the air speed is very low to minimize disturbances thereto.

REFERENCES:
patent: 3468157 (1969-09-01), Burk et al.
patent: 3817098 (1974-06-01), Brown

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