Coin diameter measurement

G - Physics – 07 – D

Patent

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G07D 5/02 (2006.01)

Patent

CA 2244102

A coin diameter measuring circuit uses a pair of coils coupled in the feedback path of an oscillator so that the oscillator frequency is dependent upon the inductances of the coils and the mutual inductance therebetween. The coils are switched between aiding and opposing configuration during the time that a coin passes therebetween, the oscillator frequency in each configuration is measured, and the difference therebetween determined to provide an indication of the mutual inductance of the coils, and thence the diameter of the coin. Preferably, the diameter is determined by the difference between the measured mutual inductance with the coin present and with the coin absent.

Un circuit de mesure du diamètre de pièces de monnaie utilise deux bobines couplées dans la chaîne de retour d'un oscillateur, de telle sorte que la fréquence de ce dernier est fonction des inductances des bobines et de leur inductance mutuelle. Les bobines sont commutées entre une configuration facilitant le passage du courant et une configuration d'opposition pendant qu'une pièce passe entre elles, la fréquence de l'oscillateur est mesurée pour chaque configuration et la différence est déterminée pour donner une indication de l'inductance mutuelle des bobines et donc du diamètre de la pièce. De préférence, on détermine le diamètre par la différence d'inductance mutuelle, mesurée avec et sans pièce.

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