Short name: door safety sensor or hall motion sensor.
Benefits: Protect the safety of passengers at the entrance floor, especially those not fluent passenger of elevator operation, pregnant women or older people with slower movement, passengers together with children in stroller or portable goods accompanied, trolley ...
Mechanism of action: using infrared beam automatically detects obstructions / object is moving walkway into an elevator, a full beam scans the object if the area is just before the doors and close under the 3D ray surrounding. Thus the doors are kept open or close exactly according to their needs in scale, avoiding the passengers trapped between the door and the injured.
