photoelectric cell
noun /ˌfəʊtəʊɪˌlektrɪk ˈsel/
/ˌfəʊtəʊɪˌlektrɪk ˈsel/
(also photocell)
- an electric device that uses a stream of light. When the stream is broken it shows that somebody/something is present, and can be used to control alarms, machines, etc.
Topics Engineeringc2光电池;光电感应器;光电管