N° 59
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对透明玻璃的位置控制 除了需要检测控制玻璃的高度,玻璃边缘的位置同时也需要检测。由于玻璃全透明的特性,这种检测不容易实现。只有4%的可见光会被玻璃表面反射回来,另外有8%的可见光会被玻璃底面反射回来。德国SI的平行光幕传感器可以实现对透明玻璃的边缘检测。
Position measurement of a transparent glass plate
Glass handling machines must be informed not only about the distance of a glass plate but also about the edge position of a glass plate. However the detection of the edge of a transparent glass plate is not so easy, especially if there is nearly no phase on the edges. The direct reflection rate of visible light on a standard glass surface is normally approximately 4% and with the additional reflection of the second surface around 8% of the light will be reflected.
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