How does it work? | Banknote detector
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To Manufacture counterfeit money began in the days of Ancient Egypt. With the advent of banknotes, the task of the counterfeiters has been simplified, and States have begun to develop special protections that would be difficult to forge. Some of them have watermarks appeared in Italy in the 13th century. Presumably their founder is Jacques Legrand Amable first used watermarks on postage stamps. In the 80s of the last century in the United States of America introduced the first detector of banknotes. How they work — this was in today's issue!
So, viewing detectors of banknotes intended for visual authenticity control of banknotes. This type of detectors allows to authenticate banknotes of absolutely any country of the world and of any denomination. The fact that the screening detector only renders the protective signs of banknotes, and the decision on whether it is true or not, adopts operator. Therefore the quality of the inspection depends on the qualifications and experience directly who conducts the study notes. On the one hand, such a device turns out the most simple and cheap, and with another — requires certain skills.
Depending on the type of illuminator and method of authenticity control, viewing detectors are divided into 3 types: ultraviolet, infrared and universal.
The Most simple devices are UV detectors. They are no longer a serious obstacle to counterfeiters and is able to "filter out" only the poor quality fakes. UV detectors is one or more UV-lamps, often with a magnifying glass and a scale grid, and capable of detecting the luminescent image, the threads and fibers of banknotes in ultraviolet light lamps. UV protection provided by the introduction of banknotes in the paper with special substances and paints that do not glow in the ultraviolet range. When checking banknotes using ultraviolet detector original bill would not glow, and fake, in contrast, will reflect the ultraviolet radiation.
Ultraviolet detection is used in automatic detectors for banknotes as well as in machines for money, which will be discussed in the next issue, and play the role of the first – the coarse filter.
The Most reliable to date devices to identify the fakes are infrared detectors. The fact that the technology of applying paint and its composition are too expensive, therefore counterfeiters unprofitable to use of infrared markers in the production of counterfeit banknotes. Infrared detectors contain IR illumination of the working area, the camera with the appropriate filter and display that displays the image from the camera. Depending on the currency type and its denomination in the infrared range see individual parts of the image of the banknote, which reflect infrared rays. Those areas in which the special label applied was not, in the infrared range will not be displayed. Visualization of the label is performed on the integrated display of the detector.
Also the IR detector allows to determine the bills of the special security feature called "M", which is a dye having a different absorption coefficient for different parts of the spectrum in the IR region. To control spetselement "M" used two groups of illumination with different wavelengths, which are switched on alternately. The element "M" it looks flashing.
There are also combination detectors that combine both infrared and ultraviolet sensors. Additionally they can be equipped with detectors of magnetic labels. Combined devices are more reliable but have a high cost.
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