| 摘要 |
<p>PURPOSE: A device is check the authenticity of coins, tokens or other flat metal objects. CONSTITUTION: The device for checking the authenticity of coins, tokens or other flat metal objects is includes a channel, with a lower and an upper wall, along which a coin moves, lying on the lower wall, past at least one inductive sensor with a coil(S). The coil(S) is fed with a first current(11) from a first power or voltage source(19) and with a second current(12) from a second power or voltage source(21). Between the coil(S) and the first power or voltage source(19)is a capacitative element(C1) from an impedance(Z1). The phase difference(phgr.1) between the first current(11) and the voltage across the impedance(Z1) is used as the criterion for acceptance or rejection of the coin.</p> |
