Fred C Webb

US Patent:

45065535, Mar 26, 1985

Filed:

Sep 30, 1983

Appl. No.:

6/538071

Inventors:

Charles W. Bruce - Las Cruces NM
Kenneth E. Kunkel - Las Cruces NM
Fred C. Webb - Las Cruces NM

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

G01F 136
G01P 517

US Classification:

7386165

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.