Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-02-14
1976-07-20
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
G01R 3312
Patent
active
039709213
ABSTRACT:
The present invention relates to a method and apparatus for measuring the length of long length materials, whose accuracy in detecting a magnetic mark is improved by having the magnetic mark, used in measuring a long material containing a magnetic constituent unit by passing the periodic magnetic marks through an A.C. magnetic field.
The apparatus for measuring the length of long length materials according to the present invention forms a magnetic powder layer locally on the surface of a long length material containing a magnetic constituent, then applies a magnetic mark, then passes it through an A.C. magnetic field, and detects the magnetic mark at a location at a distance of a known unit length from the location of the application of the magnetic mark and at the same time causes a magnetic mark to be subsequently applied on the preceding magnetic powder layer, this procedure being repeated to measure the length unit length by unit length of the material.
REFERENCES:
patent: 2989690 (1961-06-01), Cook
patent: 3066253 (1962-11-01), Bowers
Panich et al., A Device for Measuring the Length of a Moving Wire, Inst. & Control (G.B.), No. 7, July, 1970, p. 61.
Corcoran Robert J.
Sumitomo Electric Industries Ltd.
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