Registers – Coded record sensors – Particular sensor structure
Patent
1978-02-13
1980-05-20
Cook, Daryl W.
Registers
Coded record sensors
Particular sensor structure
235493, G06K 708, G06K 1906
Patent
active
042035449
ABSTRACT:
A method for identifying an article provided with a coded magnetic member comprising creating a detection zone by supplying an exciter coil with exciting alternating current, passing the article with the coded magnetic member through the detection zone to produce at least one signal from the coded magnetic member and detecting the derived signal using a detector coil to determine the code of the magnetic member. The magnetic member is provided with at least one of a plurality of elements made of magnetic alloys each having a different hysteresis loop and a code value is assigned to each type of alloy. The code value of each of the elements is decoded by measuring the phase shift of the signal derived using the detector coil relative to the phase of the exciting alternating current. This phase shift is indicative of the type of alloy and of the code value assigned thereto.
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patent: 3290487 (1966-12-01), Scott
patent: 3686479 (1972-08-01), Rogers et al.
patent: 3717749 (1973-02-01), Rogers
patent: 3783249 (1974-01-01), Wiegand
patent: 3790754 (1974-02-01), Black et al.
patent: 3986205 (1976-10-01), Fayling
patent: 4134538 (1979-01-01), Lagarde et al.
Cook Daryl W.
Metalimphy
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