Contactless measurement of the electrical resistance per unit length of filaments
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United States of America Patent
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Jan 21, 1992
Grant Date -
N/A
app pub date -
May 31, 1990
filing date -
May 31, 1989
priority date (Note) -
Expired
status (Latency Note)
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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.
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