DEVICE FOR MEASURING TEMPERATURE OF LOWER SURFACE OF STEEL IN HEATING FURNACE

摘要

PURPOSE:To measure the temperature of the lower surface of the steel under the stable state, by providing radiation introducing holes in a cooled path so that the radiated light from the lower surface of the steel is introduced into optical fibers provided in the inner tube of double cooling tubes. CONSTITUTION:The cooling tubes 3 are inserted through a measuring hole 2 and positioned at a specified place with respect to the steel 5 in the furnace. The measuring parts of the optical fibers 4 and 4' are positioned at the place where skid marks are located at the lower surface of the steel 5 and the place between the skid marks. The irradiated light from the lower surface of the steel is received through the radiation introducing hole 15 and 15'. The minimum level value and the maximum level value are measured by radiation thermometers 28 and 28', and the measured values are recorded in a display and recording device.