Selective spectral transmittance and heat conservation efficiencies of
some heat-mirror systems consisting of ZnS/Me (Me=Al or Ag) under dif
ferent configuration were studied. The 15 nm ZnS/20 nm Ag system has o
ptimal selective spectral transmittance in the visible wavelength rang
e and the highest reflection in the infrared wavelength range. For thi
s system, Ag can keep its optical characteristics after heating at 200
degrees C by the protection of the thick ZnS layer. The system consis
ting of 15 nm ZnS/10 nm Al is the most efficient heat mirror of the Zn
S/Al systems.