LIGHT POWER-DENSITY DISTRIBUTION OF IMAGE SPOT OF LASER TRIANGULATIONMEASURING

HaiMing Wang [Wang HaiMing, Long range optical triangulation utilising collimated probe beam. Optics and Lasers in Engineering, 23(11), 1995 , 41-52] studied the influences of the size of the object spot on the image spot in laser triangulation measuring. This paper points out tha t the study method of HaiMing Wang is inappropriate from two points of view. The size and relative power density distribution of the image s pot can be calculated either when assuming the object spot is an ideal Feint, which emits a uniform spherical wave over the object, or when assuming that the object surface is a light scattering surface. Both t he conditions show that the size of the image spot is much bigger than that of HaiMing Wang's. (C) 1998 Elsevier Science Ltd. All rights res erved.