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.

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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.

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Weight plays no role in validation on a mechanical mechanism. The coin carrier wheel is essentially “complete” when the coin is placed in the slot, allowing the wheel to pass the coin detector. You can find a diagram here: Gumball Machine Diagram and Instruction Manual.
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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 or token 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 pushed back out through the machine so that the customer can remove it from the slot into which it was inserted.

2Testing methods

Coin acceptors[edit]

The basic principle for coin detection is to test the physical properties of the coin against known characteristics of acceptable coins. The coin acceptor analyses the coin based on its mass, size, 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, weight and size, also scan the inserted coin using optics and match the image to a pre-defined list, or test the coin's 'metallic signature' based on its alloy 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. As a consequence of this, the coin acceptor must be cleaned properly on a regular basis to prevent malfunction or damage. Coin acceptors are modular, so a dirty acceptor can be replaced with a clean unit, preventing downtime. The old unit is then cleaned and refurbished.

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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[edit]

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[edit]

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, they are 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 shined on it. Some machines shine an ultraviolet light on the note and measure the glow to help determine the banknote's material composition.

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GMR sensor proximity detection[edit]

The particles in the ink on many countries' currency have ferromagnetic properties, including some elemental iron.^[1] Magnetic composition comprises 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 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[edit]

The thickness and dimensions of a banknote are tested to ensure they are correct. US currency is 2.61 inches wide by 6.14 inches in length and are 0.0042 inches thick, and weigh 1 gram.^[4] Currency printed prior to 10 July 1929 had larger physical characteristics.^[5] As the notes pass between the rollers, the voltages vary according to their thickness.^[6]

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