Apparatus for measuring small values of air flow

Details Apparatus for measuring small values of air flow Apparatus for measuring small values of air flow

1983-09-30

1985-03-26

Ruehl, Charles A.

Measuring and testing

Volume or rate of flow

Using differential pressure

73189, 7386118, G01F 136, G01P 517

Patent

active

045065535

ABSTRACT:
A gas flow rotor cyclically connects a microphone to a dynamic flow press and then a reference static flow pressure. The microphone converts the pressures to a resultant alternating differential signal providing a first input to a phase-locked amplifier. A second amplifier input is derived from an optical pickup mounted on the rotor. Only the AC component of the converted microphone signal, which has a fixed phase relationship to that of the rotor, is amplified. A readout connected in circuit with the amplifier indicates the dynamic flow pressure.

REFERENCES:
patent: 2315756 (1943-04-01), Warner
patent: 3386287 (1968-06-01), Hurvitz

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