Application technology of laser and CCD in high temperature environment

The characteristics of the high temperature environment in tin bath and the practical glassmaking of float glass production are analyzed. We selected dynamic optical measuring method for glass thickness measurement. A semiconductor laser was used as the light source and a linear CCD is used for the detector to pick up data within 600degreesC on the area of the tin bath. By analyzing and calculating a lot of dynamic measurement experimental data were obtained with the measurement device. Based upon the theory of heat transfer the working area of the measurement device can be kept at a constant temperature near the tin bath by using a circulation water-cooling system and low temperature nitrogen. The image processing technology was used for the edge detection and the pixel subdivision in the software of the system. At the same time the factors that influence accuracy of the system are discussed and some compensation measures are also proposed. The accuracy of 5 mum dynamic on-line measurement is achieved and the accuracy of static measurement is less than I am within the range of 2similar to20mm thickness of glass. All these enable linear CCD to be successfully applied in the practice of high temperature environment.