When it comes to supermarket entry and exit systems, especially automatic doors, they typically rely on two types of sensors: infrared sensing and radar sensing. Each has its own unique features and functions.
For infrared sensing doors, the setup usually involves a small barrier post placed in front of the main support column that holds the swinging mechanism. Inside this barrier post lies the sensor. One side of the post houses an infrared emitter, while the opposite side features a reflector, much like the kind you'd see on a bicycle's rear light. The emitted red light reflects off the surface of the reflector, creating a closed circuit. When a customer walks by, interrupting this beam of light, the system detects the obstruction and sends a signal to the main sensor column, triggering the door to open automatically.
Radar sensing doors, on the other hand, often appear more seamless since they don’t require visible barriers upfront. The sensor itself is mounted directly onto the main support column. This creates an invisible detection zone approximately one meter in front of the column. Regardless of whether someone approaches straight-on or from the side, as long as they enter this sensing area, the door receives a signal to open. It’s a bit like having an invisible field around the doorway that reacts to movement.
Both technologies serve the same purpose—making entrances and exits convenient—but they do so in slightly different ways. Infrared sensing tends to be more precise, requiring direct line-of-sight between the emitter and reflector, whereas radar sensing offers broader coverage without needing specific alignment. Understanding these differences can help shoppers appreciate how modern technology enhances their shopping experience!
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