在一个实施例中，一种装置设置有光源、光学元件、至少一个光电传感器、和控制系统。
In one embodiment, apparatus is provided with a light source, an optic element, at least one photosensor, and a control system.
在一个实施例中，一种装置设置有光源、光学元件、至少一个光电传感器、和控制系统。
In one embodiment, apparatus is provided with a light source, an optic element, at least one photosensor, and a control system.
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