Microwave moisture-profile gauge

Details Microwave moisture-profile gauge Microwave moisture-profile gauge

1978-10-02

1980-03-11

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2704

Patent

active

041930274

ABSTRACT:
The scanning microwave detection apparatus provides a moisture profile along the width of a predetermined sample such as a sheet or web. The apparatus includes a number of moisture sensors spaced along the width of the sample, such that each sensor couples microwave energy with a finite area of the sample. Each sensor is preferably a pair of horns with one located on each side of the sample to provide a microwave path through the sample. A first filter is coupled to the input of each sensor and a second filter is coupled to the output of each sensor. The pair of filters associated with each sensor is tuned to the same frequency, and each of the pairs of filters are tuned to a different predetermined frequency within a selected frequency band such that the sensors operate at different frequencies, within substantially non-overlapping frequency band-passes. The filters are preferably directional. A microwave source is coupled to the input filters and is controlled to sweep through the selected frequency band to sequentially energize each sensor. A detector is coupled to the output filters for detecting the sequential energy outputs of the sensors. These sequential outputs are a function of the moisture content of the finite areas of the sample at the sensors.

REFERENCES:
patent: 3470343 (1969-09-01), Bilbrough
patent: 3534260 (1970-10-01), Walker

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