大口径空间相机像质的微振动频率响应计算

发布时间：2018-03-31 17:31

本文选题：大口径空间相机　切入点：机载望远镜　出处：《光学精密工程》2016年05期

【摘要】：由于大口径空间相机对空间环境变化和卫星内部振源引起的微振动十分敏感,本文研究了影响成像质量的微振动频率响应的计算方法,以改善相机的在轨动态成像质量。该方法通过实际光学模型取代线性光学模型,建立微振动光机集成模型,从而计算影响成像质量的微振动频率响应。首先,建立大口径空间相机有限元模型,进行结构频率响应计算,得到采样频率点的光学表面节点位移和相位。然后,通过蒙特卡洛分析方法,建立微振动光机集成模型,以均方根光学系统动态传递函数和视轴漂移衡量大口径空间相机动态成像性能。最后,研制了大口径空间相机力学样机,对其进行了振动试验,验证了有限元模型的正确性。试验结果表明仿真结果与试验结果接近,误差均在5%以内,满足大口径空间相机动态成像质量分析的要求。
[Abstract]:Because the large aperture space camera is very sensitive to the change of the space environment and the microvibration caused by the internal vibration source of the satellite, the method of calculating the frequency response of the microvibration which affects the imaging quality is studied in this paper. In order to improve the on-orbit dynamic imaging quality of the camera, this method replaces the linear optical model with the actual optical model, and establishes the integrated model of the micro-vibratory optical machine, and then calculates the frequency response of the micro-vibration which affects the imaging quality. The finite element model of large aperture space camera is established and the structural frequency response is calculated to obtain the displacement and phase of the optical surface node at the sampling frequency point. The dynamic imaging performance of large aperture space camera is evaluated by the dynamic transfer function of root mean square optical system and the shift of view axis. Finally, the mechanical prototype of large aperture space camera is developed and its vibration test is carried out. The experimental results show that the simulation results are close to the experimental results, and the errors are less than 5%, which can meet the requirements of the dynamic imaging quality analysis of large aperture space cameras.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家863高技术研究发展计划资助项目(No.863-2-5-1-13B)
【分类号】：V445.8

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