Calibration Technologies of Optical Double-Triangulation for Measuring Tiny-Dimension Characteristics

In order to realize the rapid and precise 3D profile measurement of workpieces with tiny-dimension characteristics, optical double-triangulation is studied. The measuring accuracy is affected by many factors such as system structure, surface characteristic and the circumstance. It is improved in the aspects of system structure and calibration in this paper. Two cameras are adopted to reduce the measuring dead area and eliminate the impact of the shadow caused by the object’s surface incline. The least-square curving fitting method combined with appropriate error compensation is selected according to analyses and comparisons of various calibration approaches. Experimental results are illustrated to verify the effectiveness of the measuring principle and the reliability of this measuring system.