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Q2 What is "near infrared" ?
How can things be counted on a production line in a factory without touching them?
Yes, it's true. For example, sensors emit infrared rays onto a production line, and automatically count the numbers produced by the infrared rays reflected back.
The device used is divided into the part generating the infrared radiation and the part receiving it, with any object coming between the transmitter and reciever causing a detection signal to be emitted. The products moving down a production line are detected and counted using this system. This system also underlies automatic doors and other devices. Sensors that emit infrared rays are used in this fashion.