Further on, each equipment has its own banknote properties detection sensors and meanings which allow to determine banknotes authenticity. Let's consider them more closely.
Here is given a decoding of abbreviations of names of detection, which you can see in a model's name, and a brief description of this detection and a visual image.
CIS (Contact image sensor) – this scanning technology is based on direct receiving of light flux, reflected from original surface or passed through the banknotes, by light sensitive sensors, without using of intermediate system of mirrors and lenses. CIS-scanners light sensitive
elements line is of the same width as scanning operating field. And it's located as close to scanned surface as possible, hence the word "contact" in its abbreviation.
Each scanned line is lighted by one (monochrome image) to three lines of LEDs (RGB image). Reflected light, passing through micro lenses, falls on light-sensitive elements. Image information, by means of ADC, is converted to digital code, then it is handled and transmitted to decision-making block of the device.
Metallized protective thread is present in the paper of banknotes. On the reverse of the banknote protective thread has the shape of dashed line. When this thread is held to light it looks like solid dark band.