motion detector - Definition & Meaning

a device that detects the presence of movement within a specific area and can trigger an alarm or other action as a resulta device that detects the presence of movement within a specific area and can trigger an alarm or other action as a result

A motion detector is a device that senses movement within a specific area. It is commonly used for security purposes, activating alarms or lights when it detects motion. The detector works by using infrared sensors, ultrasonic waves, or other technology to sense changes in the environment, such as when a person walks by. Motion detectors are often installed in homes, offices, and public spaces to monitor activity or trigger automatic actions, such as turning on lights when someone enters a room. They help enhance security and energy efficiency by only activating when movement is detected.A motion detector is a device that senses movement within a specific area. It is commonly used for security purposes, activating alarms or lights when it detects motion. The detector works by using infrared sensors, ultrasonic waves, or other technology to sense changes in the environment, such as when a person walks by. Motion detectors are often installed in homes, offices, and public spaces to monitor activity or trigger automatic actions, such as turning on lights when someone enters a room. They help enhance security and energy efficiency by only activating when movement is detected.

例句

The motion detector in the hallway turned on the lights as soon as I walked past.
走廊里的运动检测器在我走过时立即打开了灯。
The security system uses a motion detector to monitor any movement around the house.
安全系统使用运动检测器来监控房屋周围的任何运动。
The motion detector alerted the homeowners when someone tried to enter their yard at night.
运动探测器在夜间有人试图进入他们的院子时提醒了房主。