Title :
Resolving ambiguity in broadband waveguide permittivity measurements on moist materials
Author :
Ball, James A R ; Horsfield, Brendan
Author_Institution :
Dept. of Electr. Eng., Southern Queensland Univ., Toowoomba, Qld., Australia
fDate :
4/1/1998 12:00:00 AM
Abstract :
The dielectric properties of moist materials depend strongly on free water content. Moisture content may be conveniently sensed using microwaves, provided that calibration data is available. One common method utilizes network analyzer transmission measurements on waveguide cells filled with samples of known water content. Since this technique yields multiple solutions for the complex permittivity, a simple procedure has been developed to identify the correct solution. This has proved to be highly reliable and lends itself to measurement automation
Keywords :
S-parameters; calibration; microwave measurement; moisture measurement; permittivity measurement; ambiguity resolution; broadband waveguide permittivity measurement; dielectric properties; free water content; microwave measurement; moist materials; scattering parameters; swelling clay soils; swept frequency measurements; transcendental equation; vector NWA; waveguide transmission line cells; Calibration; Dielectric materials; Dielectric measurements; Electromagnetic waveguides; Microwave measurements; Microwave theory and techniques; Moisture measurement; Permittivity measurement; Scattering parameters; Water;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
