The Coin Acceptor Work
The coin detection is based on the physical features of the coin versus the knowledge of permitted coin attributes. First, the coin acceptor identifies the medium based on the coin’s weight, diameter, thickness, the composition of the metal, and magnetism. After that, the note-to-coin exchanger usually performs the next step.
Nowadays, in some places, ingenious electronic coin acceptors are used which, in addition to verifying the mass, weight, and size, also scan the inserted coin with optical lasers and assign the image to a predefined list or test the coin “metallic signature “due to its metallic composition.
Coins in normal circulation collect microscopic dirt, dust, oil, and grate particles from the fingertips of human beings. Thousands of pennies rolling along the rail leave sufficient filth, dust, oil, and grease to be visible when operating a coin accepter for many periods. For this reason, the coin acceptor should be thoroughly cleaned regularly to avoid breakdown or damage. In addition, the coin acceptors are modular, so a dirty coin acceptor can be replaced with a clean unit, minimizing downtime. The old unit is then cleaned and reconditioned.
Some newer types of coin acceptors are capable of “training” coins so that, when correctly entered, they will accept any new type of coin or token.
Sellers and money changers use different methods to determine if a banknote is authentic. These settings and the respective sensitivity are adjusted via DIP switches on the internal circuitry.
One of the main techniques used in selling machines is optical scanning using a small detector called photocell, or mini-digital camera. The banknotes of many countries are pixelated, which means that they are made up of small dots. The points are distributed differently and have different sizes depending on the grade. Optical sensors can look for these varied models to determine the type of bill input. Some banknotes are also fluorescent – they glow when irradiated with UV light. Some machines illuminate the banknote with ultraviolet light and measure the brightness to determine the material composition of the banknote.
GMR Sensor Proximity Sensing
Particles in the inks are ferromagnetic, including the elemental iron, of many national coins. In terms of the weight of the whole composition, the magnetic composition consists of Nano foam in 0.1% to 45%.
Banknotes are supplied by a range of permanent magnets and magnetized along their route. The residual field of ink particles can be detected using a magnetic sensor several centimeters away with its sensitive axis parallel to the flight direction.
In this situation, the magnet bias aims to obtain a controlled alignment of ink particles’ magnetic moments, resulting in a discernible maximal magnetic signature. As a result, the reversal of the magnetization field is possible.
The thickness and dimensions of a banknote are checked for accuracy. For example, the US coin measures 2.61 inches wide by 6.14 inches long, 0.0042 inches thick, and weighs 1 gram. As the banknotes pass between the rollers, the tensions vary according to their thickness.