Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1978-03-13
1979-05-29
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2704
Patent
active
041568435
ABSTRACT:
A moisture indicator and control device for measuring the moisture content of a moving web includes a modulated signal microwave generator, directional microwave transmitter and receiver antenna horns which are angularly mounted with respect to each other on one side of a moving web of material whose moisture content is being monitored. The transmitter and receiver horns are mounted within an enclosure with their adjacent edges in physical contact and with a selected optimum angle between them to minimize residual energy transfer from the transmitter horn into the receiver horn. Sine wave modulated microwaves are transmitted by the transmitter horn toward the web at a selected angle of incidence thereto. A portion of the modulated microwave signal is reflected by the web and is received by the tranmsmitter horn. The microwave detector in the base of the receiver horn detects the reflected microwave signal and produces a sine wave output, the amplitude of which is directly proportional to the amount of moisture present in the web. The moisture indicator circuit includes in connected series an operational amplifier whose gain is adjustable over a wide range for amplifying the detected signal, an a-c to d-c convertor for converting the a-c detected signal to d-c, a d-c amplifier whose gain is controlled by a range potentiometer and a microammeter moisture meter. The device further includes a special offsetting circuit to offset any signal present when no material is in front of the transmitter horn, an over range indicator, and moisture control circuit for providing correctional control signals for restoring the moisture content of the web to a selected level.
REFERENCES:
patent: 3133246 (1964-05-01), Jaffee et al.
patent: 3144601 (1964-08-01), Slabodsky
patent: 3490037 (1970-01-01), Williams
patent: 3534260 (1970-10-01), Walker
patent: 3593136 (1971-07-01), Chapman et al.
patent: 3639834 (1972-02-01), Walker
patent: 3693079 (1972-09-01), Walker
patent: 3913012 (1975-10-01), Kujath
patent: 4052666 (1977-10-01), Auer et al.
Strandberg Robert C.
Strandberg, Jr. Charles F.
Krawczewicz Stanley T.
Strandberg Engineering Laboratories, Inc.
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