G - Physics – 01 – J
Patent
G - Physics
01
J
73/112, 73/52
G01J 5/06 (2006.01) G01J 5/52 (2006.01)
Patent
CA 1084725
ABSTRACT OF THE DISCLOSURE Apparatus and method for measuring the surface tem- perature of an item or a product in a furnace utilizing radiation detection from the item and from a cooled re- ference plate. The radiation signals derived from the hot item and the cooled reference plate, both of which are positioned in the furnace, are subtracted one from the other to provide an output signal which is representative of the item's surface temperature. The reflectance of the hot item and the cooled reference plate are selected to be approximately equal. When the reflected radiation from the hot item and the cooled reference plate are equal, the difference in radiation received by the radiation detection pyrometers will be the radiation emitted by the hot product. The pyrometers are aimed through apertures formed in the furnace wall at a cooled reference plate and the hot item to detect the radiation from each. The pyrometer outputs, which are subtracted, will accurately represent the hot steel temperature even for changing furnace conditions. The cooled reference plate is spaced apart from the hot item's position or travel path through the furnace. The cooled reference plate can be placed at a position in the furnace where it is unlikely to be damaged by movement of material into or through the furnace even when a pile-up occurs within the furnace. Equal reflective radiation from both the hot item and the cooled reference plate is not required if the reflections are proportional for furnace variations. If the reflectivities are different or if the cooled reference plate is placed in the furnace where the reflective radiations are not equal, but the reflections of the reference and the hot item are still proportional, the relative strength of the pyrometer signals can be multiplied by a position factor to provide the correct output. Various means can be utilized for deriving signals which are proportional to the radiation from the cooled reference plate and the hot slab. The pyrometers selected operate at a wavelength which is not particularly suscept- ible to slab emittance variations. -2-
307615
Jones & Laughlin Steel Corporation
Moffat & Co.
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