DEVICE FOR CHECKING AUTHENTICITY OF COINS, TOKENS AND OTHER FLAT METAL OBJECTS Russian patent published in 2000 - IPC

FIELD: instruments. SUBSTANCE: device has coin channel 1, which lower wall 4 carries coin, which passes first and second inductance detectors 9, 10, which are designed as coils or coil and metal plate(, 11; 10, 12). First coil is mounted on lower wall 4. Second coil 10 is mounted on upper wall 5. Two coils may operate independently. In preferable embodiment, coils 9 and 10 are inserted into electric circuit of resonance line circuit. When coin M passes, parameter of resistance alteration which is induced in each coil 9 and 10 is measured and analyzed, in order to determine alloy composition and thickness of coin M. EFFECT: independent measurement of alloy composition and coin thickness, increased precision of measurement. 14 cl, 6 dwg