Gas flow measuring system

Details Gas flow measuring system Gas flow measuring system

1978-03-15

1981-06-09

Gill, James J.

Measuring and testing

Volume or rate of flow

Using differential pressure

73717, 128725, G01F 138

Patent

active

042717019

ABSTRACT:
The pressure difference across a pneumotach restriction is sampled with a gas chopper connected across a pressure difference detecting transducer. The gas chopper alternates the pressures backward and forward in application to the transducer so that the latter develops an AC sampling signal, the strength of which is related to flow. This AC signal is sampled in synchronism over intervals having a duration related to the power line frequency to develop an integrated value of the pressure difference free of drift caused by power line interference. The resultant signal is smoothed and summed in alternating response at double the gas chopper sampling rate to give a smooth output which is then multiplied by a linearizing circuit to obtain a flow signal which is proportional to the pressure difference. Specific gas flow structures and electronic sampling circuitry are disclosed.

REFERENCES:
patent: 3195028 (1965-07-01), Werner et al.
patent: 3295370 (1967-01-01), Marx
patent: 3296868 (1967-01-01), Koppel et al.
patent: 3509767 (1968-07-01), Greer
patent: 3924612 (1975-12-01), Dempster et al.

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