Method and apparatus for the measurement of the properties of sh

Details Method and apparatus for the measurement of the properties of sh Method and apparatus for the measurement of the properties of sh

1987-04-23

1988-04-19

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 58C, 324 585R, 73 73, 73159, G01R 2700, G01G 700

Patent

active

047392495

ABSTRACT:
A measurement method and an apparatus are used for determining the moisture content of sheet- or foil-like materials (1) of high moisture content and low electrical conductivity. Ground planes (3) are adapted on both sides of the material (1) to be measured; between each ground plane (3) and the material (1) to be measured, at least one center conductor (2) is adapted approximately parallel to the material (1) to be measured in order to form a quasi-TEM transmission line resonator. Electromagnetic RF energy is fed into the quasi-TEM transmission line resonator so that the electromagnetic quasi-TEM waves propagate in the plane of the material (1) to be measured. The resonator supports for the transverse and longitudinal waves such resonant modes whose resonant frequencies and Q's are dependent on the properties of the material (1) to be measured. The resonant frequencies and related Q's are measured, and these are used for determining the complex dielectric constant of the material (1) to be measured or, alternatively, the characteristics related to them.

REFERENCES:
patent: 3514703 (1970-05-01), Soga
patent: 3710243 (1973-01-01), Keenan
patent: 3810004 (1974-05-01), Henoch
patent: 4297874 (1981-11-01), Sasaki
patent: 4350883 (1982-09-01), Lagarde
patent: 4581575 (1986-04-01), Osaki

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