Measuring and testing – Moisture content or absorption characteristic of material
Reexamination Certificate
2005-06-14
2005-06-14
Williams, Hezron (Department: 2856)
Measuring and testing
Moisture content or absorption characteristic of material
C073S073000, C073S074000, C073S075000, C324S664000
Reexamination Certificate
active
06904789
ABSTRACT:
A sensor to detect the presence of water or moisture in bulk materials includes a standard circuit board and a three element transmission line. The sensor electronics include an oscillator responsive to a direct current voltage supply which provides a square wave voltage signal. The sensor electronics further include a phase detector which detects the difference in phase between the reference square wave voltage signal and a signal provided to the transmission line buried in a medium. The phase difference is proportional to the dielectric constant of the medium surrounding the transmission line.
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Article inComputers and Electronics in Agriculture,1998, pp. 31-44, written by Gaylon S. Campbell and Russell Y. Anderson entitled “Evaluation of Simple Transmission Line Oscillators for Soil Moisture Measurement”.
Campbell Gaylon S.
Greenway Warren C.
Decagon Devices, Inc.
Holland & Hart
Jackson André K.
Williams Hezron
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