The principles of non-blackbody radiation and of the application of emittance corrections is discussed for various industrial conditions. Beside the commonly treated case of radiation from a non-blackbody in the open, others discussed are radiation from a heated object surrounded by walls at a higher or lower temperature, radiation from an object viewed through flame, smoke, and furnace gases, and radiation from glass. A table and curves are given for obtaining emittance corrections applicable for a radiation pyrometer having a Pyrex glass lens and another table and other curves are given for a radiation pyrometer with fused silica lens. The use of an optical pyrometer as a “checking instrument” is discussed, and a table and curves are given for emittance corrections where λ=0.65μ. Comparisons are drawn between the readings of the optical pyrometer and radiation pyrometers having the two types of lens, for the condition eλ=et. For certain cases data and procedures are given by means of which emittance corrections are obtainable. For other cases, only the underlying principles are discussed. A bibliography is given.
© 1945 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
Thomas R. Harrison
J. Opt. Soc. Am. 35(11) 706-708 (1945)
J. C. Mouzon and C. A. Dyer
J. Opt. Soc. Am. 39(3) 203-210 (1949)
J. Opt. Soc. Am. 29(12) 520-530 (1939)