Electricity: measuring and testing – Magnetic – Movable random length material measurement
Patent
1985-12-19
1987-11-24
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Movable random length material measurement
324251, 338 32H, G01B 704, G01R 3302, H01L 4300
Patent
active
047092084
ABSTRACT:
The present invention comprehends a magnetic mark detector system in which the magnetic detector head is customized to the magnetic span of the North/South poles of a magnetic mark on a cable and is focused to concentrate the specific magnetic characteristics of flux of the magnetic mark to a detector and to exclude the effects of extraneous earth magnetic fields. The magnetic head structure includes spaced apart elongated head members constructed from magnetic material and disposed in an end to end relationship. The head members have an overall length functionally related to the magnetic span of a magnetic mark and focus magnetic flux. Between facing ends of the head members, in a centrally located gap, is a Hall field effect device which responds to magnetic flux and produces an electrical output signal. In a detection circuit connected to the Hall device, a signal is amplified and calibrated so that the strength of the magnetic mark is measured and output to a comparator which produces indications of weak or strong marks which can be recorded.
REFERENCES:
patent: 2794951 (1957-06-01), Broding et al.
patent: 3873912 (1975-03-01), Mori et al.
Eisenzopf Reinhard J.
Kerr Measurement Systems, Inc.
Snow Walter E.
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