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6189V-MMA12
同轴照明是指照明光线平行地穿越固定式同轴镜头的垂直面,对于观察非常平整或抛光的表面是非常理想的,例如镜子表面的划痕或者其他瑕疵。
图16为同轴光源的照明方式。LED的高亮度均匀的光线通过半透半反镜后成为与镜头同轴的光线,用于均匀照射具有反射性的工作界面,对光洁表面上的异常特征成像突出,表现力好,主要用于金属玻璃等光洁表面的划痕检测,芯片和硅片的破损检测,PC模板的圆谱等的检测。同时,同轴光的光源位于照明光路的侧面,这样的照射方式可以减少光路的复杂性,避免光源的放置给光路带来的不必要的麻烦。例如,轴承外侧伤痕检测。
同轴光源属于类平行光的应用,光源前面带漫反射板,形成二次光源,光源主要方向趋于平行,但是有少量非平行光成分。
但是需要注意的是:同轴灯可以反光,但只适合检测平面的物体,而不适合检测有弧度的物体。因为同轴灯让相机只能接收与物体垂直,也就是和镜头同轴的光线,所以就叫同轴灯。
6189V-MMA12
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