Design of optical emission system in 3D shape detection with oblique laser triangulation probe

Abstract

Abstract In 3D laser scanning measurement system, the measurement accuracy of the whole system is determined by the optical system of the laser triangulation probe. This paper studies the optical transmitting system of oblique laser probe to solve this problem in 3D shape detection, based on the analysis of the principle of oblique laser triangulation. In order to reduce the influence of stray light and reduce the geometric distortion of 3D laser scanning measurement system, this paper selected a laser with a wavelength of 650nm as the light source to improve the distribution uniformity of image plane illumination. The design of optical transmitting system of the laser probe applies the beam splitter and normal coaxial layout under the premise of reducing the number of lenses and ensuring imaging quality. Finally, the results are analysed for radial transfer function curve, spot diagram and relative distortion.