Registers – Coded record sensors – Particular sensor structure
Patent
1977-03-16
1979-01-16
Kilgore, Robert M.
Registers
Coded record sensors
Particular sensor structure
235493, 360 2, 340572, 343 65LC, G06K 708, G01S 956, G08B 2100, G11B 2504
Patent
active
041345380
ABSTRACT:
An apparatus and process for identifying objects marked by a magnetic band or thin filament comprising detecting the passage of the magnetic band in a detection zone comprising a framework having an excitation coil fed with alternating current to produce an alternating magnetic field and a detecting coil balanced with the excitation coil such that no signal normally will appear in the absence of a magnetic body in proximity to the framework. The passage of an object carrying a magnetic band in proximity to the framework producing for each alternation of the excitation field an unbalance in a detecting circuit and the appearance of a signal which is fed to apparatus for the detection and measurement of the phase of the signal with respect to the excitation field. The magnetic band is selectively divided at variable predetermined locations by cuts of variable predetermined extent such that at the time of passage of the bands proximate the detection zone, signals of variable amplitudes are also produced, the decoding of the signals being effected in the detection apparatus by measurement of their amplitude.
REFERENCES:
patent: 3325632 (1967-06-01), Lilly
patent: 3699311 (1972-10-01), Dunbar
patent: 3755803 (1973-08-01), Cole
patent: 3832530 (1974-08-01), Reitboeck
patent: 3958105 (1976-05-01), Sidlauskas
patent: 3970824 (1976-07-01), Walton
patent: 4029945 (1977-06-01), Yamada
Elie Andre
Lagarde Pierre
Kilgore Robert M.
La Societe Metalimphy
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