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How Automatic Doors Sense People
自动门如何感知人的靠近
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Automatic doors open when you walk near them.你走近时，自动门会自动打开。
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They use invisible infrared light beams to detect movement.它们利用不可见的红外光束来探测移动。
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A sensor sends out light and watches for its return.传感器发出光线并监测其反射。
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If something blocks the beam, the door knows a person is there.若有物体挡住光束，门便知道有人来了。
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Then a small motor pushes the door open smoothly.随后，小型电机平稳地推开大门。
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This helps people with carts, bags, or wheelchairs enter easily.这方便了推购物车、拎行李或坐轮椅的人进出。
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No buttons or touching are needed for clean, fast access.无需按键或触碰，即可实现洁净、快捷通行。
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The system resets quickly after you pass through.你通过后，系统迅速复位。