different orientations.

Photodetector receives light through the optical system consisting of the mirror wheel and an optical filter. The reflected light, rapidly varying in brightness with a data pattern, is then converted into an electrical signal and is subsequently amplified to a usable level for digital processing.

CCD readers (also known as LED scanners)

Charge-coupled device (CCD) readers use an array of hundreds of tiny light sensors lined up in a row in the head

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