A Study on Adaptable Non-contact Shape Inspection System

A new dimension measuring method for the measurement of diameter of an object has been developed using laser triangulation. The 3 D data of an object was calculated from the 2 dimensional image information obtained by the laser stripe using the laser triangulation. The system that use existing theory can measure the diameter of hole not only in a normal plane but also in an incline plane. However, in the existing theory, since the lens with fixed focal length was used, the area of measurement was fixed. The simplest way to solve this problem is to change distance between a CCD camera and object. Other way is to use a zoom lens having variable focal length. In this paper, the zoom lens with variable focal length was used. Therefore, we can experiment with magnification that is optimized according to size of object using zoom lens with variable focal length.