| 摘要 |
A document (e.g. banknote) authenticating apparatus comprises a transport system ( 32-34, 50, 51 ) for transporting banknotes. An inspection device ( 35 ) is provided past which banknotes are transported by the transport system, the inspection device including a UV source ( 1 ) such as a LED and a UV detector ( 4, 5 ) arranged to irradiate a banknote and to detect reflected UV respectively. A processor ( 11 ) is responsible to the reflected UV to determine the authenticity of the banknote. The inspection device ( 35 ) includes a reference surface ( 3 ) over which the banknotes are transported in use, the reference surface being exposed to UV radiation from the source ( 1 ) in the absence of a banknote so as to generate a reference level signal, and being oriented such that the banknotes are delivered at an acute angle to the surface whereby passage of a banknote across the surface effects a cleaning action on the surface.
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