Apparatus and method to detect moisture
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United States of America Patent
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Jun 14, 2005
Grant Date -
Dec 4, 2003
app pub date -
May 17, 2003
filing date -
May 30, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus for detecting moisture. An oscillatory electrical signal S1 generated by an oscillator is propagated into a body that includes an electrically insulative material. A signal due to S1 emerges from the body as an oscillatory electrical signal S2. The signals S1 and S2 differ in phase by Δφ, wherein Δφ is indicative of moisture along a path traversed by S1 within the insulative material, and wherein the conductance σ of the insulative material is also indicative of the moisture along the path traversed by S1 within the insulative material. S2 is received at a sensing surface of a sensing part (e.g., probe, sensing antenna, etc.) and then transmitted to a moisture detecting device. The moisture detecting device determines from S1 and S2 a measure M of the moisture as a function of Δφ or as a function of σ.
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