光电门(photogate/light gate)是一个像门样的装置，一边安装发光装置，一边安装接收装置并与计时装置连接。
龙门式光电门 plano-type photogate
电光快门 electrooptical shutter ; electron potical shutter
光电开门器 [自] photoelectric door opener
厦门光讯电子有限公司 QEC
厦门瀚光电子有限公司 TANCOM
将双管光电门应用于动量守恒定律，得到了较满意的效果。
When the two-tube photoelectric door is applied to the law of conservation of momentum. the satisfied results are obtained.
滑行器上部有五条“T”形槽，可用螺钉和螺帽方便地在槽上固定光电门。
There are five is the taxi "T" type screw groove, usable and nuts in filigree conveniently fixed photoelectric door.
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