The movement detector is there to identify when she is sound asleep.

移动探测器是用来确认她是否睡沉。

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Motion detector activated lighting normally stays off until the sensor detects movement.

运动探测器保持正常启动照明关闭，直到传感器探测到的运动。

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Convert the lateral movement of the spatial fringes across the detector plane into temporal fringes by use of grating elements.

通过空间条纹的横向运动在探测器平面上转化为时间条纹通过光栅元件。

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The Letter Logger can be programmed to check its position every few minutes, over longer intervals, or only when a built-in motion detector senses movement, says Jude Daggett, of TrackingTheWorld.

ECONOMIST: Monitor