| 摘要 |
An optical device for detecting the presence of an object at a control station located along a path of the object; the device employs an optical fiber having two ends, a CCD sensor, and an electronic control unit connected to the CCD sensor; a first end of the optical fiber is so located at the control station as to face the path of the object, and a second end is connected directly to a photosensitive surface of the CCD sensor.
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