Self-adjusting sensor

G - Physics – 01 – B

Patent

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Details

G01B 21/08 (2006.01) B65H 7/02 (2006.01) B65H 7/12 (2006.01) G01B 7/06 (2006.01) G07D 7/00 (2006.01)

Patent

CA 2216968

A sensing device comprised of a sensing circuit (92) which changes its operating characteristics when an object comes near it. The sensing circuit (92) produces a change in output voltage proportional to the change in relative distance between the sensing circuit and an object. The actual output voltage is a functional of both target distance and control circuit input voltage. The control circuit (96) includes a comparator (102) for comparing the steady state output voltage to a reference voltage and adjustment system (104) for adjusting the input voltage to change the steady state output voltage such that the steady state output voltage approximately equals the reference voltage. The control circuit (96) reacts only to reductions in the steady state output voltage, indicative of mechanical wear, and not to increases in output voltage, indicative of currency thickness measurement.

Le détecteur de l'invention comprend un circuit de détection (92) qui fait varier ses caractéristiques de fonctionnement lorsqu'un objet s'approche de lui. Ce circuit de détection (92) génère une modification de la tension de sortie proportionnelle à la modification intervenant dans la distance entre le circuit de détection et un objet. La tension réelle de sortie est fonction à la fois de la distance cible et de la tension d'entrée du circuit de commande. Le circuit de commande (96) comprend un comparateur (102) qui compare la tension de sortie constante à une tension de référence et un système d'ajustement (104) qui règle la tension d'entrée afin de modifier la tension de sortie constante de sorte que cette dernière soit approximativement égale à la tension de référence. Le circuit de commande (96) réagit uniquement aux réductions de la tension de sortie constante, indiquant l'usure mécanique, mais ne réagit pas à la tension de sortie, indiquant la mesure de l'épaisseur du billet de banque.

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