Method of determining water content of a material and measuring apparatus
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United States of America Patent
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Issued Date -
Jan 27, 2005
app pub date -
Jun 4, 2004
filing date -
Dec 5, 2001
priority date (Note) -
Abandoned
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Abstract
The invention relates to a method of determining the water content (W.sub.v %) of a material (12) by using electromagnetic waves, the method comprising following steps: applying an electromagnetic wave; measuring the propagation time (T) of a surface electromagnetic wave (26) between two points (10, 28); calculating the dielectric constant (.epsilon.') of said material (12) from said propagation time (V); determining the dry mass per unit volume (.gamma..sub.d) of the material (12); and calculating the water content (W.sub.v %) of said material (12) from said dielectric constant (.epsilon.') and said dry mass per unit volume (.gamma..sub.d). The invention also provides apparatus enabling said water content (W.sub.v %) to be determined using two antennas (10, 28), means (44) for measuring the transit time (T), and processor means (48).
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