There will be a series of new problems in optical system at low temperature, such as material characteristics, changes in the overall performance of optical element unit and system, optical element deformation, low temperature pollution and so on. In order to meet the needs of exploring an optical system in aerospace, a set of low temperature vacuum experimental device is developed. The low-temperature vacuum optical experimental device includes a low-temperature vacuum chamber, a vacuum pumping system, a Zygo interferometer, an anti vibration platform and a monitoring and temperature measurement system. The low-temperature vacuum chamber is designed for the experiment of small optical elements. It is mainly used to measure the temperature field and low-temperature deformation of optical elements, and export the local heat generated by the motor to the outside of the system as much as possible
With the development of space technology and military technology, the resolution of detection instruments is required to be higher and higher. Under the condition of deep cold, when the target signal to be detected is very weak, the background radiation of the detection instrument mainly comes from the optical system and support structure of the instrument itself. The sensitivity of the detection instrument is seriously affected by the radiation of the system itself. In order to reduce this thermal noise, cooling the optical system is a necessary method. Only by cooling the optical system and its related components to a certain extent, can we effectively reduce the flux of background photons, give play to the function of background limit detector and greatly improve the sensitivity of detector.