| 摘要 |
The device includes an oscillator electrode which is electrically conductive and has a time-varying oscillator signal applied to it. A horizontal electrode is electrically conductive and disposed adjacent to and physically separate from the oscillator electrode by a set distance. A vertical electrode is electrically conductive and disposed adjacent to and physically separate from the oscillator electrode by a set distance. A signal processing device is connected to all of the oscillator, horizontal electrode and vertical electrode, for providing the oscillator signal to the oscillator electrode, for sensing when the oscillator signal is capacitively coupled to the horizontal and vertical electrodes and for determining the presence of a valid security thread associated with a document. |
