Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-09-22
1983-08-16
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2704
Patent
active
043994032
ABSTRACT:
A microwave moisture measuring, indicating and control apparatus for measuring the moisture content of material in an inspection area, comprising a microwave transmitting transducer including a modulated signal microwave generator and parabolic reflector for directing a beam of microwave energy through the inspection area and the material to be monitored therein and including a microwave absorping material layer in the path of the microwave beam directed from the reflector toward the inspection area. A microwave receiver transducer is located on the opposite side of the inspection area from the transmitting transducer and also includes a parabolic reflector for receiving the microwave energy monitoring beam after its passage through the inspection area and direct from the same to a microwave detector, the monitoring beam also passing through a layer of microwave absorping material at the receiver transducer. The microwave detector produces an output signal which is processed by moisture measuring and indicating circuitry to provide an output reading which is directly proportional to the amount of moisture present in the material located in the inspection area. The device further includes a moisture control circuit for providing correctional control signals for restoring the moisture content of the material to a selected level, if desired.
REFERENCES:
patent: 2142648 (1939-01-01), Linder
patent: 2165214 (1939-07-01), Blau et al.
patent: 2212211 (1940-08-01), Pfund
patent: 2670649 (1954-03-01), Robinson
patent: 3534260 (1970-10-01), Walker
patent: 3639834 (1972-02-01), Walker
patent: 3913012 (1975-10-01), Kujath
patent: 4156843 (1979-05-01), Strandberg, Jr. et al.
Strandberg Robert C.
Strandberg, Jr. Charles F.
Krawczewicz Stanley T.
Lane, Jr. Munson H.
Strandberg Engineering Laboratories, Inc.
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