| 摘要 |
<p>A counterfeit detection apparatus for banknotes and other valuable document is described comprising a DC power supply (1) which supplies a high frequency power supply (3), with its own discrete 5 volts, to a circuit board (5) containing logic circuitry and signal conditioning circuitry and a single chip processor. The power supply (3) is connected to a UV lamp (9) and a metallised thread detector (14) formed by a pair of metallic rollers (15, 17) which roll across a banknote (19) to detect the conductivity of a metallised thread in the banknote (19). A drive from rollers (15, 17) rotates an encoder disc (21) the rotational movement being monitored by a pair of photodiodes (23, 25). The apparatus includes means for detecting the amount of UV absorption and electro-mechanical means for autoreferencing the lamp's intensity. Displays (31) are provided to give a visual or audible verification of the authenticity of the banknote (19).</p> |
