How the laser scanner works

How a Laser Scanner Works Laser scanners are among the most commonly used scanning devices across various industries. They are widely applied in retail, logistics, manufacturing, and more due to their efficiency and reliability. The basic working principle of a laser scanner involves a handheld device that emits a laser beam from a laser diode. This beam is directed toward a rotating prism or a mirror that moves back and forth. As the laser light hits the surface of a barcode, it reflects off the black and white bars. The reflected light then travels back through the scanner’s window, where it is captured by a lens and focused onto a photoelectric sensor. This sensor converts the light into an electrical signal, which is then decoded by either built-in circuitry or software on the connected device. There are two main types of laser scanners: handheld and fixed. Handheld models are portable and easy to use, making them ideal for mobile applications. Fixed scanners, on the other hand, are often used in environments where high-speed scanning is needed, such as conveyor belt systems. These models allow users to free up both hands while still efficiently reading small barcodes. One of the key advantages of laser scanners is their ability to perform non-contact scanning. They are particularly useful when the scanning distance exceeds 30 cm, as they can read barcodes from a distance without physical contact. This feature also helps protect the barcode from damage. Additionally, laser scanners can read barcodes on irregular surfaces, through glass, or even transparent labels, which makes them highly versatile. They also offer a high first-read success rate, faster recognition speeds compared to traditional light pens or CCD scanners, and strong performance even with low-quality or blurry barcodes. Their bit error rate is extremely low—about one in three million—making them a reliable choice for critical applications. Overall, laser scanners combine speed, accuracy, and flexibility, making them an essential tool in many modern industries. Whether you need a compact handheld model or a robust fixed system, there's a laser scanner designed to meet your specific needs.

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