| 摘要 |
An apparatus (100) for determining thickness of a banknote (1), comprising: a light generator (8) to emit a light beam (12); and a sensor array (10) to detect at least a portion of the emitted light beam (12); wherein the thickness of the banknote (1) is determined by detection of a change from a predetermined position of the emitted light beam (12) by the sensor array (10).
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