How is information in bar codes transmitted?
Bar codes are everywhere. In 2010, nearly every product sold today has a bar code on it, and even the Internal Revenue Service uses bar codes on its tax forms. The bar code began its life at the middle of the century and is now one of the most recognizable coding systems in the world.LightFirst, red light needs to hit the black and white lines. The black lines will absorb the light and the white space will reflect it. The bar code reader sends the light onto the paper and then catches it with sensors.SensorThe sensors in the bar code reader take the reflected light and dissects it. After it figures out where the light is and isn’t coming from, it turns the information into an analog signal. The analog signal is sent to a converter, which transforms it into digital output for the reader’s software to use.SymbologyThere are a variety of different symbologies for bar codes, some more common than others. The bar code reader will test to see if the symbology its reading is recognized by the
