Dielectric constant measuring method and apparatus

Details Dielectric constant measuring method and apparatus Dielectric constant measuring method and apparatus

1994-08-29

1996-07-02

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324631, 324632, G01N 2200

Patent

active

055326048

ABSTRACT:
A method of measuring the dielectric constant of a sheet-like material is disclosed, the method using a cavity resonator having a transverse slit formed in the intermediate region thereof between the opposite ends for disposing a sample sheet perpendicularly to the direction of the length thereof. The dielectric constant is measured as a function of the difference f.sub.1r -f.sub.r2 between the microwave resonant frequency f.sub.1r of the cavity resonator obtained when the sample is not inserted in the transverse slit and the microwave resonant frequency f.sub.r2 of the cavity resonator obtained when it is inserted in said transverse slit. The resonant frequency f.sub.2r (.beta.) is calculated in the state in which the sample sheet in said transverse slit is rotated through a given angle .beta. with respect to said longitudinal axis from the predetermined angle designated by 0.degree., from the formula approximating the resonance curve in the cavity resonator.

REFERENCES:
patent: 3739263 (1973-06-01), Henoch
patent: 4604898 (1986-08-01), Gohin et al.
patent: 4710700 (1987-12-01), Osaki et al.
patent: 4801862 (1989-01-01), Osaki et al.
patent: 4904928 (1990-02-01), Lewis

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