Currency detector: what it is, types, how it works

With the help of the detector determine the authenticity of the bill of any currency and any denomination. With his help, you can quickly check the stack of money and determine the counterfeit. Two types of currency detectors are widespread: viewing and automatic. In devices of the first type the operator or the cashier decides whether the banknote is genuine or counterfeit. The second type devices completely eliminates the possibility of any operator's decision, everything happens automatically.

Classic currency detectors

Classic currency detectors are designed for visual visual inspection. They illuminate the bill with a special light, and hidden marks showing the authenticity of money appear. The operator needs to know these marks. The distinguishing feature of classic detectors is their low price. They are easy to operate and work with different currencies and their denominations.

There are three main varieties of classic detectors, depending on what they use to show the marks on banknotes:

• ultraviolet detectors;
• infrared detectors;
• Universal detectors that check the banknotes in several ways.

Ultraviolet verification is based on the fact that only special marks, individual fibers and other marked parts glow under UV rays in the original banknotes. The paper itself does not include optical brightener and does not change its appearance under UV rays. The downside is that counterfeiters are adept at tampering with the UV tags. The detectors are used for checking small amounts of money. This method of detection is outdated, experienced operators are needed, beginners may miss the counterfeit.

Infrared inspection involves glow under the infrared rays of a special paint. The paint is applied to banknotes in such a way that the glow of banknotes occurs in certain places. Maximum security is ensured, as counterfeiting is very rare because of the high cost of the dye and the way it is applied. The infrared verification tags are well preserved and are resistant to all types of damage. Even old and badly worn banknotes can be authenticated. The contrast of the screen can be adjusted in almost all models. Currency exchange offices, banks, large stores, and supermarkets work with IR detectors.

A comprehensive check includes two detections. Additional features, such as a display, an optical lens, or a magnetic sensor, significantly increase reliability. Such detectors are larger than the previous ones and cost more. The level of detection of counterfeit banknotes is quite high.

Automatic banknote detectors

The principle of operation of automatic banknote detectors. The verification process involves spectral analysis of ink, ultraviolet and infrared radiation, magnetic detection is checked, and the optical density of banknotes is checked. All actions are carried out automatically without human intervention. When a counterfeit is detected, the machine immediately emits a loud beep along with a light signal. It is impossible not to notice or ignore them.

The following automatic banknote detectors are distinguished:

• single-sided;
• four-sided;
• monovalent;
• multi-currency.

In single-sided detectors the banknote must be inserted on a certain side. An incorrectly inserted banknote is identified as a counterfeit. They are used where there is little attendance or check the banknotes quite rarely.

In four-sided models, bills are inserted in any of the four directions. They do not have a certain side. The detector is practical and can check more than one batch of banknotes. Good for work with a large number of visitors.

Monocurrency devices are capable of detecting only one type of banknotes. Convenient in stores and organizations working only with certain bills. Multi-currency detectors are capable of detecting several different types of currencies.