Radiation measurement of a product temperature in a furnace

Details Radiation measurement of a product temperature in a furnace Radiation measurement of a product temperature in a furnace

1977-09-12

1979-03-20

Gill, James J.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

G01J 506, G01J 552

Patent

active

041447581

ABSTRACT:
Apparatus and method for measuring the surface temperature of an item in a furnace utilizing radiation detection from the item and from a cooled reference plate. The radiation signals derived from the hot item and the cooled reference plate, both of which are positioned in the furnace, are subtracted 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. The reference plate is maintained at a temperature at which it will emit insignificant radiation. When the reflected radiation from the hot item and the cooled reference plate are equal, the difference in radiation received by radiation detection pyrometers will be the radiation emitted by the hot product. 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 and is unlikely to be damaged even in the event of a pile-up. The pyrometers selected operate at a wave-length which is not particularly susceptible to slab emittance variations.

REFERENCES:
patent: 3475962 (1969-11-01), Mazur

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