Antenna-probe measuring moisture in soil and other mediums

Details Antenna-probe measuring moisture in soil and other mediums Antenna-probe measuring moisture in soil and other mediums

1996-05-09

1997-07-08

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324601, 324632, G01N 2200

Patent

active

056465378

ABSTRACT:
A waveguide assembly adapted for use with a time domain reflectrometry device for use in measuring the moisture content in soils and other mediums. A waveguide assembly comprised of a plurality of waveguide conductors (probes) for insertion into the soil are connected to a coaxial cable. An electronic stepped pulse travels through the coaxial cable and, due to an impedance mismatch where the coaxial cable and the waveguide assembly are joined, a downgoing beginning reference wave or reflection is produced. The beginning reference wave provides a starting point for measuring the accumulated time delay as the electronic pulse continues to travel through the waveguide assembly. An ending reflection wave is created as the electronic pulse reaches the end of the waveguide assembly and transmits into the surrounding soil. The apparent dielectric of the soil may be ascertained having determined the accumulated delay time, and in turn one can ascertain the moisture content of the soil using the apparent dielectric value.

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Oliver: "Electronic Measurements and Information." McGraw Hill--1972--p. 63 .

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