The aim of this work is the non-contact profile measurement of glowing steel rods and billets. The temperature of the slabs is approximately 1000 o C, their velocity up to 6m/s.
The used principle of measurement is the light sectioning method. This method is a well known measurement technique for optical determination of object sections. A laser plane is projected onto the object from one direction. The emerged profile on the scene is viewed from a different direction using a ccd-camera.
All algorithms needed for calculation were generated in Matlab.
Before measuring the profile, the positions of the laser and the camera are acquired by calibration. For this purpose a calibration object with known dimensions was manufactured. To avoid systematic errors the measurement is done with two lasers. By using a second laser it is possible to acquire the running direction of the measured slab and so the undistorted profile can be calculated.
Further various types of lasers with different wavelengths and powers were tested and the most suitable application was realized in a prototype. The emitted temperature radiation from the glowing slab was absorbed by an interference filter in front of the objective of the, ccd-camera. Finally the prototype was tested successfully in the production line at Edelstahl
Witten-Krefeld GmbH.
Due to the insights of this thesis an industrial measure