NON-CONTACT METHOD OF DETECTING OUTFLOW OF SLAG WITH USE OF LIGHT IN WHICH COLOR SIGNAL AND BRIGHTNESS SIGNAL ARE CONVERTED INTO DENSITY LEVEL OF EACH PIXEL FOR CALCULATING MEAN DENSITY LEVEL IN MONITORING AREA

摘要

PURPOSE: A non-contact method of detecting outflow of slag with use of light is provided to prevent a sensor from being malfunctioned or broken by detecting the outflow of slag through a non-contact scheme. CONSTITUTION: A surface of molten steel is photographed by means of a CCD camera in such a manner that an electric signal is generated based on the state of molten steel. The electric signal is divided into a color signal and a brightness signal. Then, the brightness signal is converted into a temperature distribution. The color signal and the brightness signal are converted into a density level of each pixel, thereby calculating a mean density level in a monitoring area. An alarm signal is generated when the mean density level exceeds a predetermined reference level.