光電開關檢測技術ppt課件(已修改)
2024-12-20 03:21 本頁面
【正文】 檢測技術 光電開關 光電開關 漫反射式光電開關 鏡反射式光電開關 對射式光電開關 槽式光電開關 光纖式光電開關 光電開關 光電開關 工作原理 光電開關（光電傳感器）是利用被檢測物體對光束的遮光或反射，由同步回路選通而檢測物體的有無，所檢測的物體不限于金屬， 對所有能反射光線的物體均可檢測 。 光電開關 工作原理 Principle of Photoelectric Sensor Principle of Photoelectric Sensor Emitting method Pulsemodulated Most of the photoelectric sensors emit a beam which is pulsemodulated. In this method, a strong optical signal of fixed width is emitted at a fixed time interval. This helps the receiver to distinguish the signal from extraneous light and to achieve a long sensing range. Principle of Photoelectric Sensor Principle of Photoelectric Sensor Unmodulated The highspeed fiber sensor FX2A3R and the color mark sensor LX12N series use an unmodulated beam. In this method, the beam is emitted constantly at a
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