| 单词 | motion sensor |
| 释义 | > as lemmasmotion sensor motion sensor n. a sensor that is sensitive to motion; a motion detector, esp. as (part of) a security device that can trigger a burglar alarm, or as an aid to positioning or navigation. ΚΠ 1965 Science 2 Apr. (front matter) 2 A maze of potentiometers, vehicle motion sensors, and servos in the steering system. 1968 Sperry Rand Engin. Rev. 21 45/1 Doppler sonar is also a motion sensor that can be used aboard military and commercial surface vessels. 1986 Family Handyman Nov. 52/1 An infrared motion sensor automatically turns lights on an off as a person enters or leaves a room. 1993 Washingtonian June 127/1 The house has high-tech security: surveillance cameras, window-vibration detectors, motion sensors. 1997 Computer Music Jrnl. Summer 70/1 Radar and microwave motion sensors have also been occasionally used to measure the dynamics of musical performers. < as lemmas |
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