G - Physics
07
D
G07D 5/08 (2006.01) G01D 5/20 (2006.01) G01D 5/247 (2006.01)
Patent
CA 2162364
Apparatus for validating items of value comprising a measurement circuit including an inductor, the complex impedance of which varies in accordance with the interaction between a test item of value and a magnetic field within which the inductor is located; means for extracting first and second periodic signals from the circuit; timing means for timing the interval between corresponding portions of the first and second periodic signals; and processing means for determining the value of a parameter related to at least one of the real and imaginary parts of said complex impedance, as a measure of the validity of said test item, from the outputs of the timing means.
Appareil destiné à valider des articles de valeur, comprenant un circuit de mesure comportant: un inducteur dont l'impédance complexe varie en accord avec l'interaction entre un article de valeur test et un champ magnétique dans lequel on a placé l'inducteur, des moyens d'extraire du circuit un premier et un second signal périodique, des moyens de synchronisation destinés à chronométrer l'intervalle compris entre les portions correspondantes des premier et second signaux périodiques, ainsi que des moyens de traitement destinés à déterminer la valeur d'un paramètre se rapportant à au moins une des parties, réelle et imaginaire, de l'impédance complexe, en tant que mesure de la validité de l'article test, à partir des signaux de sortie des moyens de synchronisation.
Dillon Stephen John
Furneaux David Michael
Steel Paul Franklin
Kirby Eades Gale Baker
Mars Inc.
Mei Inc.
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