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How Motion Sensors Make Homes Smarter and Safer
运动传感器如何让家居更智能、更安全
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Passive infrared (PIR) sensors detect heat signatures emitted by moving people or animals, triggering lights, alarms, or HVAC adjustments without physical contact.被动红外（PIR）传感器通过探测移动人体或动物散发的热量触发灯光、警报或空调调节，无需物理接触。
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Microwave and ultrasonic sensors send out invisible waves and measure reflections to sense motion through walls or furniture—ideal for wide-area coverage.微波与超声波传感器发射不可见波并测量反射信号，可穿透墙壁或家具感知运动，适合大范围覆盖。
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Smart home hubs integrate sensor data with calendars and geolocation to distinguish between routine activity and unusual patterns, like nighttime movement while away.智能家居中枢整合传感器数据、日历和地理位置信息，区分日常活动与异常行为（如外出时夜间走动）。
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Battery-powered PIR sensors last years without wiring, making retrofitting easy in older buildings where adding circuits is costly or impractical.电池供电的PIR传感器使用寿命长达数年，无需布线，便于老旧建筑改造——此类建筑加装电路成本高或不现实。
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Privacy-focused designs avoid cameras or audio recording, relying solely on anonymous thermal or wave-based detection to address ethical concerns.注重隐私的设计不使用摄像头或录音功能，仅依赖匿名化的热感应或波探测技术，以回应伦理关切。
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In elderly care, fall-detection algorithms analyze motion speed and angle to alert caregivers when sudden drops suggest accidents.在老年照护中，跌倒检测算法通过分析运动速度与角度，在突发下坠疑似意外时及时通知照护人员。
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Energy savings come from automatic shut-offs—lights dim after 5 minutes of no motion, and thermostats enter eco-mode when rooms sit empty for over 30 minutes.节能效果源于自动关闭机制：无移动5分钟后灯光自动调暗，房间空置超30分钟则温控器进入节能模式。
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Calibration tools let users adjust sensitivity and detection zones, preventing false triggers from pets or swaying curtains.校准工具允许用户调节灵敏度与探测区域，避免宠物走动或窗帘摆动引发误触发。