Transparent Layer Compensation at the Active Triangulation Systems

Abstract

The paper deals with an active triangulation technique of non-contact optical measurement of 3D properties. The basic features of the method - principle, advantages and disadvantages - are described first. But the main part of the paper is concerned with the impossibility of using the basic principle of the method for measured objects, which are covered by a layer of transparent material of unknown thickness. Most often it is a layer of oil for the preservation of metal products. This layer distorts the measured value due to the light refraction. In this work, a method of eliminating this distortion based on the use of two sensors is proposed. Experimental verification of this proposal is also presented. (C) 2019, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.The paper deals with an active triangulation technique of non-contact optical measurement of 3D properties. The basic features of the method - principle, advantages and disadvantages - are described first. But the main part of the paper is concerned with the impossibility of using the basic principle of the method for measured objects, which are covered by a layer of transparent material of unknown thickness. Most often it is a layer of oil for the preservation of metal products. This layer distorts the measured value due to the light refraction. In this work, a method of eliminating this distortion based on the use of two sensors is proposed. Experimental verification of this proposal is also presented. (C) 2019, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.