Emissivity

Measurement of low temperature radiative properties of  materials

  • Emissivity at temperatures from 20K to 300K
  • Absorptivity of material at temperature above 4.5K with respect to the radiation of temperature
    TR= 20K to 300K
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Principle of measurement

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Apparatus

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Measurement chamber (sample diam. 40 mm)

Vacuum casing tube with apparatus in LHe Dewar

Chemically polished Cu sample

Emissivity and absorptivity of copper

Map of skineffect – Cu