Apparatus for determining the water content of isotropic materials by means of microwave absorption
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United States of America Patent
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Jun 3, 1980
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N/A
app pub date -
Mar 27, 1978
filing date -
Apr 9, 1977
priority date (Note) -
Expired
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Abstract
The principle of measurement is based on the microwave absorption by the water content of a sample. The sample is located in a closed single-reflection measurement cell which is fed by a microwave oscillator which is frequency-modulated within the absorbing frequency range of the sample. The sample partially or completely fills the end section of a circular or rectangular waveguide forming the measurement cell. The waveguide is sealed off with a short circuit plate so that two planar travelling waves with a homogeneous field distribution are present in the measurement cell.
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