Coin examination apparatus employing an rl relaxation...

Details Coin examination apparatus employing an rl relaxation... Coin examination apparatus employing an rl relaxation...

G - Physics

07

D

340/124.3

G07D 5/08 (2006.01)

Patent

CA 1184269

ABSTRACT An appartus for coin testing including an improved inductive sensing arrangement. A coin to be tested is passed through an electromagnetic field produced by an inductor which is part of a resistor-inductor type relaxation oscillator operating at a frequency in the range of approximatley 100 kHz to 1 MHz. The resulting shift in frequency of the relaxation oscillator forms the basis for testing the coin. The resistor-inductor relaxation oscillator has a linear frequency response with respect to changes in the effective inductance in the oscillator over a range of inductance suitable for testing coins and produces an output signal which is digital in nature and requires no amplitude discrimination or shaping to be suitable for counting. -19-

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