Moisture detection apparatus and method

Measuring and testing – Moisture content or absorption characteristic of material

Reexamination Certificate

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Details

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”.

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