Institute of Sientific Instruments              

Measurement of low temperature radiative properties of  materials
 - Emissivity at temperatures from 20 K to 300 K
 - Absorptivity of material at temperature above 4.5 K with respect to the radiation of temperature  TR = 20 K to 300 K

 
Principle of measurement
Principle
Apparatus
Insert with chamber
Measurement chamber - sample diam. 40 mm
Measuring chamber


Chemically polished Cu sample
Cu_chem_polished
Vacuum casing tube with apparatus
 in LHe Dewar
Dewar_Emister
Emissivity and absorptivity of copper
Cu_995
Map of skineffect - Cu
          Map_SE
                          
                 ... for more data:        tomas
                                           
Musilova V, Kralik T, Hanzelka P, Srnka A:
Effect of different treatments of copper surface on its total hemispherical  absorptivity bellow 77K.
Cryogenics 47, no 4 (2007), pp. 257-261

Musilova V, Hanzelka P, Kralik T, Srnka A:  
Low temperature radiative properties of materials used in cryogenics.
Cryogenics  45, no 8 (2005), pp. 529-536