Registers – Coded record sensors – Particular sensor structure
Patent
1990-10-10
1992-09-22
Levy, Stuart S.
Registers
Coded record sensors
Particular sensor structure
235449, 324300, 324316, 324318, 585 26, G06K 708, G01V 300, C07C 1348
Patent
active
051499460
ABSTRACT:
The invention relates to a method of authenticating an object by electron paramagnetic resonance spectroscopy, the method being characterized in that at least one authenticating substance is added to the object, said substance having an EPR peak whose width is not greater than about 1.5 gauss, with the spectroscopy being performed in a static field of an amplitude such that the substance has a resonance frequency in the radio-frequency domain, and with the width of the EPR peak of the substance being used as a criterion for discrimination. The static field preferably has a low frequency colinear modulation field superposed thereon having an amplitude which is substantially greater than the EPR width of the substance, and under a radiofrequency electromagnetic field extending perpendicularly to the static field and to the modulation field and having an amplitude which is not less than the peak width, whereby paramagnetic materials having a peak width which is greater than that of the authenticating substance are not detected. The invention also provides apparatus for implementing the method, and security paper useable with the method.
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Measurement and Control, vol. 21, No. 3, Apr. 1988, London GB, pp. 83-86; R. Ladbury: "Electron Spin Resonance".
The Review of Scientific Instruments, vol. 41, No. 3, Mar. 1970, pp. 319-321; R. G. Parker and J. Jonas; "Adiabatic Fast Passage Method for Spin-Relaxation Time Measurements".
Batail Patrick
Fourmigue Marc
Jerome Denis
Tevanian Georges
Centre National de la Recherche Scientifique "CNRS"
Levy Stuart S.
Sikorski Edward
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