Non Contact 3D Measurement Scheme for Transparent Objects Using UV Structured light

This paper introduces a novel 3D measurement scheme based on UV laser triangulation to ascertain the shape of transparent objects. Transparent objects are extremely difficult to scan with traditional 3D scanners because of the refraction problem observed in the visible range. Therefore, the object surface needs to be preliminary powdered before being digitized with commercial scanners. Our approach consists of using non contact measurement scheme while dealing with the refraction problem in visible environment. The object shape is computed by classical triangulation method based on stereovision constraint. The proposed acquisition system is composed of two classical visible range cameras and a UV laser source. The exploitation of the UV laser for triangulation system characterizes the novelty of the proposed approach. The fluorescence generated by the UV radiation enables to acquire 3D data of transparent surface with a classical stereovision scheme.