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⑵對射型光電傳感器，若把發光器和收光器分離開，就可使檢測距離加大，一個發光器和一個收光器組成對射分離式光電開關，簡稱對射式光電開關。對射式光電開關的檢測距離可達幾米乃至幾十米。使用對射式光電開關時把發光器和收光器分別裝在檢測物通過路徑的兩側，檢測物通過時阻擋光路，收光器就動作輸出一個開關控制信號。
⑶反光板型光電開關
把發光器和收光器裝入同一個裝置內，在前方裝一塊反光板，利用反射原理完成光電控制作用，稱為反光板反射式(或反射鏡反射式)光電開關。正常情況下，發光器發出的光源被反光板反射回來再被收光器收到;一旦被檢測物擋住光路，收光器收不到光時，光電開關就動作，輸出一個開關控制信號。
⑷擴散反射型光電開關
擴散反射型光電開關的檢測頭里也裝有一個發光器和一個收光器，但擴散反射型光電開關前方沒有反光板。正常情況下發光器發出的光收光器是找不到的。在檢測時，當檢測物通過時擋住了光，并把光部分反射回來，收光器就收到光信號，輸出一個開關信號。
沒有信號輸出的原因
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點擊圖片查看原圖
