Patent ID: 8408400
Filing Date: 2013-04-02
Classification: G01N,G07D

Abstract:
1. A limpness detecting device comprising: a transmitting unit to irradiate an acoustic wave towards a conveyed bill to excite a Lamb wave; a first receiving unit to detect a leaky wave of the Lamb wave leaked from a front surface of the bill as an amplitude of the wave; a second receiving unit to detect a leaky wave of the Lamb wave emitted from a back surface of the sheet; a comparison data calculating unit to calculate comparison data based on the amplitude of the wave detected by the first receiving unit and the amplitude of the wave detected by the second receiving unit; and an intactness judgment unit to compare the comparison data calculated by the comparison data calculating unit with a preset standard value and to judge whether the bill is an intact bill or not, based on a result of the comparison.