STEM与日常科技·英语30篇（9）
13 / 30
正在确认阅读权限…
How Automatic Doors Sense Your Approach at Supermarkets
超市自动门如何感知你走近
-
Many supermarket doors open without you touching them.许多超市的门无需触碰即可自动打开。
-
They use infrared sensors that detect body heat and movement.它们使用红外传感器来探测人体热量和移动。
-
When you walk within two meters, the sensor sends a signal to the motor.当你走进两米范围内时，传感器会向电机发送信号。
-
The door then slides smoothly sideways in less than one second.门随即在不到一秒内平稳侧滑开启。
-
This system works even if you carry shopping bags or push a cart.即使你提着购物袋或推着购物车，这套系统依然有效。
-
It saves energy by staying closed when no one is nearby.无人靠近时，门保持关闭以节省能源。
-
Maintenance staff clean the sensor lens weekly to keep it accurate.维修人员每周清洁一次传感器镜头，确保其精准。
-
Some doors pause briefly if a child walks through slowly.有些门在儿童缓慢通过时会短暂暂停。
-
You can see a small red light near the frame when it’s active.门框附近会亮起一小颗红灯，表示正在运行。
-
Try waving your hand gently — the door will often respond right away.试着轻轻挥手——门通常会立即响应。