STEM与日常科技·英语30篇（7）
16 / 30
正在确认阅读权限…
Why Automatic Doors Open Without Touching
自动门为何无需触碰即可开启
-
Most automatic doors use microwave or passive infrared motion sensors to detect approaching people.
-
Microwave sensors emit low-power waves and measure reflections from moving objects.
-
Passive infrared sensors detect body heat changes as someone walks toward the doorway.
-
A microcontroller processes signals and activates the motor only when motion is confirmed.
-
Safety beams near the floor prevent doors from closing on feet or bags.
-
Door speed and opening width are calibrated to accommodate wheelchairs and strollers.
-
Energy-efficient designs include standby modes that reduce power consumption when idle.
-
Some models integrate with building access systems to unlock only for authorized users.
-
Weather-resistant housings protect internal electronics from rain, dust, and temperature extremes.
-
Maintenance alerts notify facility staff when sensor sensitivity drops below safe thresholds.