Patent ID: 6918482
Filing Date: 2005-07-19
Classification: G07D

Abstract:
1. An apparatus for testing the authenticity of bank notes comprising: at least one light source for emitting light suitable for exciting fluorescent light in a bank note to be checked wherein the light source is a light-emitting diode arranged to emit light containing ultraviolet light at least in a partial spectral region; at least one fluorescence detector for detecting fluorescent light emitted by a bank note to be checked; at least one amplifying device arranged to amplify output signals from the at least one fluorescent detector and/or a monitor detector; the amplifying device being formed as a lock-in amplifier; and a transport plate disposed between the light-emitting diode and the fluorescence detector, and a bank note to be checked, the transport plate having at least one-three dimensional partial area permeable at least to a partial spectral region of the light emitted by the light-emitting diode and at least to a partial spectral region of the fluorescent light emitted by a bank note to be checked.