Sensing water and moisture using a delay line
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United States of America Patent
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May 9, 2000
Grant Date -
N/A
app pub date -
Feb 11, 1998
filing date -
Feb 11, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A phase shift oscillator circuit having a delay line in a feedback loop is employed to determine soil moisture content and water level. The delay line is connected to the oscillator such that the dielectric value of the medium inside the delay line influences the frequency of the oscillator circuit. The delay line is placed in the medium to be studied. Soil moisture content and water level are calculated as a function of the frequency of the oscillator output, and changes in soil moisture content or water level are calculated as a function of changes in oscillator frequency over time. An elongated delay line is employed to measure water level.
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