Laser scanners with rotational Risley prisms: exact scan patterns

摘要

We approach the exact scan patterns produced by scanners with rotational Risley prisms.Previous methods have considered such studies mostly approximately, in the paraxial domain orusing the third-order theory. Exact, but complicated analytical solutions have also been developed. Incontrast, we propose a novel, easy-to-use, graphical method, in order to complete the exact modelingof the scanning process: with a mechanical design program, CATIA V5R20 (Dassault Systèmes, Paris,France). By ray-tracing using the prisms equations, the scan patterns are determined and studied withregard to the characteristic parameters of the device: prism angles and their rotational speeds, as wellas the scanner geometry. Marshall’s characteristic parameters are utilized: the ratios of the prism angles andof the rotational speeds. An experimental validation of the modeling procedure is completed. Theexact modeling method proposed allows for choosing the most appropriate parameters of the devicein order to obtain a certain scan pattern for a specific application.