This method employs the ring light spot image formed by a ring laser projected onto the inner surface.
该方法利用环形激光束照射到深孔内膛表面上形成的环形光斑图像进行检测。
In Fraunhofer diffraction area, the spot center is light spot, around encircle light and dark ring.
在夫琅和费衍射区域内，光斑图像中央是亮光斑，周围环绕着明暗交替的圆环。
The additional light-emitting diodes are fixed to the light body in such a way that the optical axes thereof form a concentric light spot in the form of a ring around the main light spot.
多个附加发光二极管固定在照明本体上，以这样的方式它们的光轴形成一个环绕主照明区的同心环形照明区。
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