Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1989-01-23
1989-12-19
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 585R, 324 585B, 73 611R, G01N 2200
Patent
active
048885479
ABSTRACT:
A meter measures the flow rate of a mixture by measuring a frequency characteristic of microwave propagation within a waveguide which forms a part of the conduit through which the mixture flows. Spaced apart slots in the waveguide form transmitting and detecting antennas which are connected to the output ports of a microwave bridge. An oscillator generates microwaves which are fed to the input of the microwave bridge. The output of the bridge is the difference in power transmitted through the two antennas. This signal is fed to a phase sensitive detection system and the output can be correlated to the flow rate of the mixture. In one embodiment, a computer control unit and computer controlled switches are provided to switch the microwave bridge in and out of the circuit so that both the flow rate and the concentration of an ingredient can be measured.
REFERENCES:
patent: 2982855 (1961-05-01), Wickersham
patent: 3103627 (1963-09-01), Schneider
patent: 3498112 (1970-03-01), Howard
patent: 3956695 (1976-05-01), Stamm
patent: 4423623 (1984-01-01), Ho et al.
Goldberg Ira B.
McGinn Vincent P.
Eisenzopf Reinhard J.
Hamann H. Fredrick
Harvey Jack B.
Malin Craig O.
McFarren John C.
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