Cold window assembly for improving temperature stability of space low-temperature optical system

The invention discloses a high-temperature-stability temperature control method suitable for a space low-temperature optical system. A cold window lens assembly is introduced into the front end of the low-temperature optical system, and a cold window is plate glass. A proper cold window glass material is selected, and the two sides of the cold window are respectively plated with film layers with different thermal radiation attributes, so that the surface of a light inlet is plated with a visible high-reflective film and the other side is plated with an infrared high-reflective film under the condition of meeting the high transmittance requirement of a working ordinary section. In order to prevent the flat cold window from forming ghost images on the detector, the cold window is installed at a small inclination angle. According to the invention, the thermal influence of in-orbit external heat flow fluctuation on low-temperature optics can be effectively reduced, the temperature stability of the system is impro