Experimental Measurements of Thermal Radiation Properties by Cyclic Incident Radiation | Zendy

E. W. Spisz | Zendy; John Jack | Zendy

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Experimental Measurements of Thermal Radiation Properties by Cyclic Incident Radiation

Author(s) -

E. W. Spisz,

John Jack

Publication year - 1968

Publication title -

applied optics

Language(s) - English

Resource type - Journals

ISSN - 0003-6935

DOI - 10.1364/ao.7.002259

Subject(s) - thermal emittance , absorptance , optics , materials science , radiation , radiant intensity , thermal radiation , thermal , aluminium , black body radiation , physics , beam (structure) , composite material , reflectivity , meteorology , thermodynamics

A new experimental technique is developed to determine simultaneously the total hemispherical emittance, solar absorptance, and absorptance-emittance ratio for metals at cryogenic temperatures. The method compares the temperature response of thin metal samples to a sinusoidal perturbation of an imposed radiant intensity. Emittance data are presented for aluminum, copper, and 304 stainless steel over the temperature range 150-500 K. From the data, the applicability of the cyclic radiant intensity method is evaluated, and the problems associated with extending the method to temperatures below 150 K are discussed.

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