Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1982-09-07
1985-05-28
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 2704
Patent
active
045203083
ABSTRACT:
A process and apparatus for the non-destructive measurement of the thickness of sheets or hollow bodies made of dielectric materials, such as plactis, makes use of a microwave frequency signal which is fed to an elongated microwave strip line which is placed either close to, or in contact with, the material to be measured, whereby the change in the propagation time of the signal represents the thickness, or the filling factor of the measured material. In the case of hollow bodies the strength of the signal is insufficient to be affected by the wall of the body remote from the conductor, and an advantage of the system is that it can be used to measure plastic materials while in a plastic state while in the process of extrusion.
REFERENCES:
patent: 3490037 (1970-01-01), Williams
patent: 4054255 (1977-10-01), Magenheim
patent: 4104584 (1978-08-01), Miyai et al.
Caspers Friedhelm
Rohde Thomas
Elektro Physik Hans Nix & Dr. Erich Steingroever
Krawczewicz Stanley T.
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