Process and device for high speed measurement and characterizati

Details Process and device for high speed measurement and characterizati Process and device for high speed measurement and characterizati

1997-06-13

1998-09-15

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

194318, 209569, 235449, 324232, 324243, G01R 3312, G01N 2772, G07D 700, G01V 310

Patent

active

058084665

ABSTRACT:
A process for characterization of magnetic materials for validating documents carrying marks which include magnetic materials is based on an analysis of signals supplied by an oscillator generating a low frequency signal supplying emitter windings and receiver windings that have different conformations. The receiver windings (A) and (B) are joined to an amplifier that has two outputs (S1) and (S2), output (S2) yielding, upon conformation, a signal (X) that is used as a time reference, and output (S1) yielding, after various transformations, two signals (Y) and (Z), each of which is entered into a microprocessor which, together with valid magnetic marker data, generate signals accepting or rejecting the document.

REFERENCES:
patent: 4086527 (1978-04-01), Cadot
patent: 4326198 (1982-04-01), Novikoff
patent: 4622542 (1986-11-01), Weaver
patent: 5099224 (1992-03-01), Santiago et al.

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