Opto-mechanical Structure Design And Analysis Of The Fore-optical System For The Carbon Dioxide Detector

With the development of industrial civilization, carbon dioxide and othergreenhouse gases have more and more influence on the nature and the humansociety。It has aroused human’s extensive concern and worries. In order to takecorresponding measures to control greenhouse effect, it is necessary to develop highspatial resolution carbon dioxide monitoring satellite to measure the source,distribution, migration and transformation mechanism of the carbon dioxide in theatmosphere. It has great significance for human and the ecological environment. Asone of the important loads for the carbon dioxide monitoring satellite, thedevelopment of carbon dioxide detector has great significance.In this paper, it has done a research on opto-mechanical structure design of thecarbon dioxide detector, a3D model though AE platform was built and analysedwith the finite element method. The main research work roughly as follows:1) The lightweight design of the mirrors by using topological optimizationmethod. A new single point back center flexible supporting structure form for theprimary mirror and the secondary mirror was proposed because of the high surfaceshape error requirements. This form support structure can ensure the mirrorcentrality well, reduce the surface shape error, and have good dynamic property.2) Based on the SIMP method, the lens barrel was topology optimized to find out the best layout of the reinforcing ribs.3) A kind of support structure with three points and three flexible layers wasdesigned because of the uneven thermal deformation the reflex mirror supportingpoint. This structure can effectively resist thermal load and has good dynamicproperty.4) The axial flexible design on combination installation of a multiple lens. Thestructure has good thermal stability.5) The dynamic analysis of the general assembly. It includes the modal analysis,harmonic analysis and the random response analysis. The results verify therationality of the assembly.6) The optical-structure-thermal analysis. The deformation of the Opticalelements was got under different thermal loads. The thermal elastic deformationresults were processed through optical-structure interface software. Taking rigidbody displacement of the mirror, angle and fitting mirror polynomial into the opticaldesign software and also considering the temperature’s influence on the refractiveindex of the optical materials. The defocus distance under different temperature wasobtained, which can be a reference for designing the focusing mechanism.