Communications: radio wave antennas – Antennas – Wave guide type
Patent
1989-11-28
1990-10-09
Hille, Rolf
Communications: radio wave antennas
Antennas
Wave guide type
343703, 324640, H01Q 1300
Patent
active
049623842
ABSTRACT:
A microwave measurement apparatus is disclosed for measuring an unknown property of a test material, such as moisture content, by transmitting microwave beams through such material so that a portion of the beam energy is absorbed by the moisture or other property. Two microwave input signals of different frequencies are used to form the microwave beams and the corresponding attenuated received signals are compared in order to compensate for the presence of a component in the test material, such as foundry molding sand, which is not being measured but which also absorbs microwave beam energy. To determine the density of the test material in the event of changes in such density, one of the microwave signals is used to measure the phase shift of the corresponding received signal and produce a phase shift output signal. A single microwave antenna having two microwave signal connection is employed to transmit the two microwave beams of differnet frequency without interference and another antenna of the same type receives such two beams to produce the two attenuated received signals. The two attenuated received signals of different frequency and the phase shift output signal are combined in a signal processor to produce a percent moisture content signal.
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Hille Rolf
Hoanganh Le
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