Non Uniform Temperature Change Analysis Of Influence On The Cassegrain Optical System

During the work of the spacecraft, the temperature range of the space camera is-200 ℃ to 100 ℃. Due to the working state of the spacecraft is in non uniform atmospheric temperature, non uniform intensity of pressure environments, the optical system is different to the surface, in which makes the curvature radius of the optical system, the thickness of the lens, air space, glass and other refractive index changing.So then they bring changes in the imaging quality.For optical communication system, according to the optical lens of the working state, the sun light heat radiation on the optical system for side beam and the side edge of thermal radiation will enable optical system produce non-uniform temperature changes. The common optical communication is the Cassegrain Optical System,produced by the primary mirror and the secondary mirror of non-uniform temperature,which distribution is not the same. And the lens heating deformation occurred will cause changes in the imaging quality of the optical system.Based on the above reasons. The main topic of side heat radiation is generated by the Cassegrain optical system, which is non uniform temperature distribution caused to the optical imaging changes. And try to puts forward some measures of the compensation. The main research work is completed as following:According to the existing research content and the experimental conclusion,research currently at home and abroad on the optical system of the heating analysis.According to the actual situation of satellite optical communication system, analyze the experimental conclusion, and puts forward the more appropriate theoretical model and experimental scheme.Analyze the space thermal environment under different orbit satellite thermal characteristics, especially for the satellite optical communication system heating and Cassegrain optical system heating changes under different conditions. In addition, by the analyzing structure and properties of the Cassegrain optical system, the theory of thermodynamics is combined with the actual situation of spacecraft.According to the support structure of Cassegrain optical system, the characteristics and differences of the thermal modes are analyzed. The theory of the steady in-homogeneous heating distribution of the primary and secondary lenses is presented, so that the thermodynamic deformation of the lenses is studied according to the thermal stress theory.Use the software Pro / Engineer to establish model of the Cassegrain optical system, respectively on the primary and secondary lens that system of non-uniform temperature distribution simulation, collation and analysis of the simulation data.Combine the lens thermal deformation data with ZEMAX software, which result shows that the non uniform temperature distribution of Cassegrain optical systemparameters influence, and puts forward scheme and compensation measures to avoid by the Pro / Mechanical module.This paper creatively presents non-uniform temperature distribution of the Cassegrain optical system, and provides the theoretical model and Simulation of experimental data on the basis of the point. The paper provides a new idea for non uniform temperature change research for the future development of optical system.It has a certain reference value to the thermal protection work on inter-satellite optical communication optical system.