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The automatic door has a special infrared sensor in which a person walks towards the door then the sensor detects that someone in there, it then activates the electromagnets in the entrance system which allows the door to open at at certain speed.

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12y ago
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13y ago

Automatic doors use a motion sensor, or optical sensor. The sensors are usually based at the top of the door, slightly in front of it, so that it can detect when someone becomes near to the door and trigger it to open as a result. They are ideal for busy shops or industrial buildings, where having regular doors may cause congestion or be a safety hazard.

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14y ago

The photoelectric effect. (This principle was first described by Albert Einstein.)

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Q: What is the principle of operation of the automatic door?
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