Analysis Of Micro-vibration Impact On Space Camera Imaging

In the age of fast development of information, space camera has become a n important tool to obtain a wide range of high quality image information for scientific and technological power. As the development of space camera towards the direction of high precision, large diameter and long focal length, micro-vibration on imaging quality of camera has attracted more and more attention. So the quantitative analysis of the micro-vibration impact on space camera optical component and image quality, distinguishing between primary and secondary factors affecting the quality of imagi ng is a work of practical engineering significance.With a certain space camera as the research object, based on the idea of camera micro-vibration integrated modeling analysis, combined the camera’s structure modeling and optical modeling, micro-vibration finite element simulation, optical component rigid body motion and optical axis deflection analysis and camera image quality evaluation together effectively. Firstly, established the space camera’s structure model by using finite element modeling method, adopted the reasonable simplification of geometric model and finite element model correction to ensure the accuracy of the structure model of the camera. With the camera vibration source test signal, used the finite element simulation method to obtain the structural response of the camera. After that, based on the finite element simulation data, quantitatively analyzed the change of optical component surface shape, rigid body motion and the optical axis deflection caused by the micro-vibration. Through the establishment of space camera optical model, with the image quality evaluation index of modulation transfer function, statically analyzed the modulation transfer function decline caused by the optical component surface shape and rigid bod y motion, dynamically analyzed image motion and decline in modulation transfer function due to the optical component rigid body motion and camera optical axis deflection. Finally, researched the primary and secondary factors which influence the camera modulation transfer function, analyzed the contribution of the different harmonic components in micro-vibration test signal and optical component rigid body motion on modulation transfer function.Based on the idea of integrated modeling analysis, combining structure and optical analysis make it more comprehensive to analyze the influence caused by micro-vibration on imaging quality, easy to find out the internal relation between the vibration source’s amplitude-frequency characteristic, the camera’s structure dynamic properties and the modulation transfer function, providing a reference for vibration isolation, vibration attenuation, structure optimization and the design of the product development in the future work.