Air mass flow measuring apparatus

Details Air mass flow measuring apparatus Air mass flow measuring apparatus

1975-12-18

1976-09-28

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

System

73194A, G01F 186, G01F 166

Patent

active

039824357

ABSTRACT:
A pair of spaced sound pulse transducers in a passage carrying an air flow are used with a driving and time measuring circuit for measuring the upstream and downstream sound pulse propagation times. One of the transducers is mounted on density responsive bellows for movement therewith so that the transducer spacing depends on the air density. A temperature transducer senses the air temperature. Air mass flow is electrically calculated from the temperature and the upstream and downstream pulse propagation times.

REFERENCES:
patent: 2911825 (1959-11-01), Kritz
patent: 2991650 (1961-07-01), Katzenstein et al.
patent: 3496771 (1970-02-01), Moffatt
patent: 3731532 (1973-05-01), Courty

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