Abstract
The measurement system for the 3-dimensional shape of the 360° circumference of the object is developed. The measuring method is the light section method in combination with the image processing technique. The measuring device consists of two or four pairs of CCD cameras and horizontal slit laser projectors. They are placed at vertex of a square facing to the center of the square respectively, and the infrared slit rays are projected onto the measuring object. The CCD camera captures an image of a light section line which appears on the surface of the object, and it is digitized by the computer. Its 3-dimensional position is calculated using the principle of the triangulation. The images obtained by two or four optical systems are composed, so that it is able to obtain a closed section of the object. Furthermore, the optical systems scan the measuring object in vertical direction by two linear actuators, and the 3-dimensional shape of the circumference of the object is reconstructed. The present paper deals with the measurement of several simple shape objects using two and four optical systems. From the measurement results, the relation of the number of the optical system to the measurement accuracy is evaluated.
