With high resolution, low cost and short manufacturing cycle, the optical load of aluminum–based has attracted more and more attention from researchers. In this paper, the optical system is briefly introduced and the tolerance analysis is carried out. Secondly, the whole structure of aluminum space camera is designed. The main mirror adopts integrated design method to reduce two-stage assembly. In order to ensure the assembly is simple and reliable, the whole machine adopts cylinder support. Then, the structure of the integrated main mirror is optimized, the lightweight rate reaches 30%, and the machine's quality is 1.8kg. Finally, the mechanical characteristics and temperature adaptability of the whole machine are analyzed by means of finite element analysis. The analysis results show that the system's MTF value is more than 0.2 at 20±5°C temperature and static environment, which meets the imaging requirements; and each mode is larger than 100Hz, satisfying the dynamic requirements.
In recent years, monolithic multi-surface image systems are widely concerned with the deeply development of optoelectronic imaging system and the ultra precision machining technology, most of these systems consist of multiple mirrors, and these mirrors are machined on one substrate or grouping processing on two substrates. In this paper, we discuss the optical design of visible imaging system with a filed of view 2° based on common-axial folded optical system. This study described the optical design of visible all-reflective imaging systems based on the aviation aluminum material. It works in the 0.45~0.75μm wavelength bands. The visible imaging system includes two elements, the first one is a flat mirror, and the second one is an optical element with four concentric zone aspherical mirrors, each concentric zone aspherical surfaces are 12-th order, the beam is folded and reflected between concentric zone aspherical mirrors and flat mirror, and then focused on the image plane. The surface accuracy of submicron order and position accuracy of micron order, and the technology of single point diamond turning are used to ensure the coaxality accuracy of the concentric zone aspherical mirrors. According to the optical design results, the quality of imaging arrives at the diffraction-limitation. On this basis, we design the focusing mechanism and complete system manufacturing; assembly and imaging experiment. The final system has the advantages of compactness, convenient thermal management and simple installation. It can potentially be applied to the optical system of the unmanned aerial vehicle system.