Currency detector

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A currency detector or currency validator is a device that determines whether notes or coins are genuine or counterfeit. These devices are used in a wide range of automated machines, such as retail kiosks, supermarket self checkout machines, arcade gaming machines, payphones, launderette washing machines, car park ticket machines, automatic fare collection machines, public transport ticket machines, and vending machines.

Contents

The process involves examining the coins and/or notes that have been inserted into the machine, and conducts various tests to determine if the currency is counterfeit. Because the parameters are different for each coin or note, these currency acceptors must be correctly programmed for each item to be accepted.

In normal operation, if any item such as a coin, banknote, card or ticket is accepted, it is retained within the machine and it falls into a storage container to allow a member of staff to collect it later when emptying the machine. If the item is rejected, the machine returns the item to the customer. If a coin is rejected, it usually falls into a tray or rolls out of a slot at the bottom where the customer can remove the coin. If a banknote, card or ticket is rejected, it is ejected out of the machine so that the customer can remove it from the slot into which it was inserted.

Coin acceptors

The basic principle for coin detection is to test the physical properties of the coin against known characteristics of acceptable coins. The coin acceptor identifies the coin according to its mass (i.e. weight), diameter, thickness, metal composition and/or magnetism, and then sends an appropriate electrical signal via its output connection. The next step is generally performed by the banknote-to-coins exchanger.

Today, sophisticated electronic coin acceptors are being used in some places that, in addition to examining the mass and size, also scan the inserted coin using optical laser beams and match the image to a pre-defined list, or test the coin's "metallic signature" based on its metallic composition.

Normal circulation coins eventually collect microscopic particles of dirt, dust, oil and grease from people's fingers. When a coin acceptor is used for a long time, thousands of coins rolling along a track will leave enough dirt, dust, oil and grease to be visible. So the coin acceptor must regularly be cleaned properly to prevent malfunction or damage. Coin acceptors are modular, so a dirty acceptor can be replaced with a clean unit, minimising downtime. The old unit is then cleaned and refurbished.

Some new types of coin acceptors are able to recognize the coins through "training", so they will support any new types of coins or tokens when correctly introduced.

Testing methods

Vending and change machines use several methods of deciding whether a banknote is genuine. Adjusting these settings and the sensitivity of each is programmed via means of DIP switches on the internal circuitry.[ citation needed ]

Optical sensing

Optical sensing with a small light detector called a photocell or a miniature digital camera is one of the main techniques that vending machines use. Many countries' banknotes are pixelated—that is, their image is made out of small dots. The dots are spaced differently and have different sizes, depending on the note. The optical sensors can look for these different patterns to determine what sort of note has been inserted. Some paper money is also fluorescent: it glows when ultraviolet light is shone on it. Some machines shine an ultraviolet light on the note and measure the glow to help determine the banknote's material composition.

GMR sensor proximity detection

The particles in the ink on many countries' currency have ferromagnetic properties, including some elemental iron. [1] The magnetic composition of the ink may be provided by carbon nanofoam in an amount of from 0.1 to 45 percent by weight of the total composition. [2]

Notes are passed over a permanent magnet array and magnetized along their direction of travel. A magnetic sensor located several inches away with its sensitive axis parallel to the direction of travel can detect the remnant[ clarification needed ] field of the ink particles.

The purpose of the biasing magnet in this case is to achieve a controlled orientation of the magnetic moments of the ink particles, resulting in a maximum and recognizable magnetic signature. Reversing the magnetizing field can actually invert the signature. [3]

Physical attributes

The thickness and dimensions of a banknote are tested to ensure they are correct. US bank bills (notes) are 2.61 inches wide, 6.14 inches long and 0.0042 inches thick, and weigh 1 gram. [4] Bills printed before 10 July 1929 were bigger. [5] As the notes pass between the rollers, the voltages vary according to their thickness. [6]

Miniature transducers, approximately 38 inches in diameter, offer high accuracy linear measurement in a compact space where size constraints prohibit the use of standard LVDTIs. In addition, the low-mass core is ideal for systems with low driving forces or high acceleration, and therefore will not adversely influence the delicate nature of these applications. Operating ranges are available from ± 0.005" to ± 1.00", divided into eight intermediate strokes. [6]

Genuine Federal Reserve notes have a clear polyester thread embedded vertically in the paper. The thread is inscribed with the denomination of the note, and is visible only when held up to light. Each denomination has a unique thread position and will glow a unique color in ultraviolet (UV) light. [7]

Banknote acceptors

A typical US validator with a green bezel Currency Detector - Front.jpg
A typical US validator with a green bezel

Also known as validators or acceptors, paper currency detectors scan paper currency using optical and magnetic sensors. Upon validation, the validator will inform the vending machine controller (VMC) or other host device of a credit via a parallel or serial interface. Various interfaces exist for the host device, including a single-line pulse interface, a multi-line parallel interface, a multi-line binary interface, and serial interfaces such as ccTalk, SSP, and MDB. Wrinkled or creased notes can cause these machines to reject them.

A $1 bill being passed through the acceptor mechanism. Note the pistons that grab the banknote when it detects an insert. Currency Detector - Operation.jpg
A $1 bill being passed through the acceptor mechanism. Note the pistons that grab the banknote when it detects an insert.
Tiny cameras are mounted on the printed circuit board Currency Detector - Circuit.jpg
Tiny cameras are mounted on the printed circuit board

There are currently only a handful of companies manufacturing this equipment. Crane Payment Innovations (joining Crane Payment Solutions and MEI), and Japan Cash Machine (JCM) are two of the largest, each maintaining dominance in a particular market segment. Other notable companies producing this type of equipment include Coinco, Pyramid Technologies, Inc. (PTI), International Currency Technologies (ICT), Alpha CMS (Cash Management Solutions), Astrosys, Pyramid Technologies, Validation Technologies International (VTI), Innovative Technology Ltd (ITL), Global Payment Technologies (GPT) and Jofemar. Recent innovations include remote auditing and reporting by these devices as part of an Automated Cash Handling network for entertainment, banking, retail, casino and other industries.

See also

Related Research Articles

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<span class="mw-page-title-main">Banknote</span> Form of physical currency made of paper, cotton or polymer

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<span class="mw-page-title-main">10 euro note</span> Euro banknote

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<span class="mw-page-title-main">50 euro note</span> Banknote of the European Union

The fifty euro note (€50) is one of the middle value euro banknotes and has been used since the introduction of the euro in 2002. The note is used by some 343 million Europeans and in the 25 countries which have the euro as their sole currency. In July 2024, there were about 14,712,000,000 fifty euro banknotes in circulation in the eurozone. It is by far the most widely circulated denomination, accounting for almost half (49.0%) of the total banknotes. Estimates suggest that the average life of a fifty euro banknote is about four years before it is replaced due to wear.

<span class="mw-page-title-main">100 euro note</span> Euro banknote

The one hundred euro note (100 €) is one of the higher value euro banknotes and has been used since the introduction of the euro in 2002. The note is used daily by some 343 million Europeans and in the 25 countries which have it as their sole currency. In July 2024, there were approximately 3 987 000 000 hundred euro banknotes in circulation in the eurozone. It is the third most widely circulated denomination, accounting for 13.3% of the total banknotes.

<span class="mw-page-title-main">500 euro note</span> Banknote of the European Union

The five-hundred-euro note (500 €) is the highest-value euro banknote; it was produced between the introduction of the euro in 2002 until 2019. Since 27 April 2019, the banknote has no longer been issued by central banks in the euro area, but it continues to be legal tender and can be used as a means of payment. It is one of the highest-value circulating banknotes in the world, worth around 535 USD; 3 874 CNY; 83 598 JPY; 426 GBP, or 487 CHF as of April 2024. The note is used in the 26 countries that have the euro as their sole currency, with a population of about 343 million.

An intelligent banknote neutralisation system (IBNS) is a security system, that is used by banks, ATMs, retail establishments, vending machines and the cash-in-transit industry, to render stolen funds un-useable and easily identifable. Dye packs are inserted between bills in random bundles. If a bundle containing a dye pack is removed from a specified area, it explodes, releasing an indelible ink dye and possible array of additional chemicals. The conspicuous bright color stains on the bills, allow quick easy visual recognition of stolen money. Tracers and markers can also be added to the ink or bonding agent providing forensic evidence linking the criminal to the crime. Bonding agents have been used more recently.

<span class="mw-page-title-main">Frontier (banknotes)</span> 2011 Canadian banknote series

The Frontier series is the seventh series of banknotes of the Canadian dollar released by the Bank of Canada, first circulated in 2011. The polymer banknotes were designed for increased durability and to incorporate more security features over the preceding 2001 Canadian Journey series. The notes feature images that focus on historic Canadian achievements and innovation. Printed on polymer, the 2011 Frontier series was the first series issued by the Bank of Canada printed on a material other than paper. The 2011 Frontier series is being followed by the Vertical series.

References

  1. "MONEY IN A BLENDER-A MONEY SMOOTHIE". Steve Spangler Science. 2013. Retrieved 26 May 2014.
  2. Xerox Corporation (Apr 26, 2006). "Magnetic ink composition, magnetic ink character recognition process, and magnetically readable structures" (EUROPEAN PATENT SPECIFICATION). EP 2 390 292 B1. European Patent Office.
  3. Caruso, Michael J.; C.H. Smith; T. Bratland; R. Schneider. "A New Perspective on Magnetic Field Sensing" (PDF). Plymouth, MN and Eden Prairie, MN: Honeywell SSEC and Nonvolatile Electronics: 14–15. Archived from the original (PDF) on 2012-06-17. Retrieved 2014-05-26.{{cite journal}}: Cite journal requires |journal= (help)
  4. "US Currency FAQs". US Bureau of Engraving and Printing. 14 May 2014. Archived from the original (FAQ) on 5 May 2015. Retrieved 26 May 2014. The approximate weight of a note, regardless of denomination is (1) one gram.
  5. "Six Kinds of United States Paper Currency" . Retrieved 26 May 2014.
  6. 1 2 "LVDT use in ATM to Sense Dollar Bills" (PDF). LVDT Application. Trans-Tek, Inc.: 1. Archived from the original (PDF) on 30 May 2013. Retrieved 26 May 2014.
  7. "Know Your Money" (PDF). US Secret Service. April 2008. Archived from the original (PDF) on 8 February 2015. Retrieved 26 May 2014.