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.
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