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>An Apparatus for the Measurement of the Total Normal Thermal Emissivity of Sheet Materials in the Temperature Range 140 to 500deg;F
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An Apparatus for the Measurement of the Total Normal Thermal Emissivity of Sheet Materials in the Temperature Range 140 to 500deg;F
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机译：An Apparatus for the Measurement of the Total Normal Thermal Emissivity of Sheet Materials in the Temperature Range 140 to 500deg;F
A description is given of an apparatus for measuring the total normal thermal emissivity of sheet materials up to frac38; inches in thickness at temperatures from 140 to 500deg;F without contact or damage to the surfaces viewed. An analysis of possible errors is made which shows the outer limits of absolute values to be within plusmn;1 percent of blackhyphen;body emission. A table of emissivities as measured are given with values from the literature included for comparison. By minimizing errors due to reflection, the values for poor emitters are found to be somewhat lower than usually reported and are held to be more accurate.
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