Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-06-21
1977-10-11
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3312
Patent
active
040538273
ABSTRACT:
Apparatus for measuring, and indicating, the thickness of non-metallic coatings over a metallic surface, such as in sheathing of an electrical cable or similar structure, has a number of measuring heads, for example four, of electrical inductance type, spaced around the structure. A probe in each head has a profiled surface for presentation to the surface of the coating, the profile such as to offset any variation in inductance effects on the probe resulting from variation in diameter of the cable, without affecting the inductance effects of any variation in coating thickness. The measuring head is flexibly mounted and the signals from circuits associated with the probes are arranged to give visual indication of variation in coating thickness, and also any eccentricity. Particularly the indication can be a visual one representative of the cross section of the cable or the like.
REFERENCES:
patent: 2779916 (1957-01-01), Poole
patent: 3419797 (1968-12-01), Libby
patent: 3760264 (1973-09-01), Zumbach
patent: 3919628 (1975-11-01), Mandula et al.
Miller Georges Michel
Millette Louis Guy
Murphy Peter
Tyszewicz Wieslaw Josef
Corcoran Robert J.
Jelly Sidney T.
Northern Telecom Limited
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