Contactless measurement of the electrical resistance per unit le

Details Contactless measurement of the electrical resistance per unit le Contactless measurement of the electrical resistance per unit le

1990-05-31

1992-01-21

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

324629, 324637, G01R 2704

Patent

active

050830902

ABSTRACT:
A non-contacting method of measuring the electrical resistance per unit length of a filament, such as a carbon-coated optical fibre, makes the filament the inner conductor of a co-axial transmission line and measures a propagation characteristic of that line. The transmission line may be divided into seven sections, with a signal injected on the second section, and a comparison of the resulting signals appearing on the fourth and sixth sections being used in a feedback loop to control the injected signal frequency in such a way as to hold constant either the relative amplitudes or the relative phases of the signals appearing at the fourth and sixth sections.

REFERENCES:
patent: 3739263 (1973-06-01), Henoch
patent: 4425542 (1984-01-01), Tsaliovich et al.
patent: 4492915 (1985-01-01), Caspers
patent: 4623835 (1986-11-01), Mehdizadeh et al.

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