One of the adjacent photodiodes then receives the optical energy and the sensor responds by sending a signal to the automatic door controller. At that point the door stops, slows or reverses, hence averting a collision and providing safety.
When one of the nearby photodiodes detects the presence of light, it activates the sensor, which then sends a signal to the automatic door control system. As a result, the door comes to a halt, slows down, or reverses direction, thereby preventing a collision and ensuring safety in the surrounding area.