| 具备调焦功能的空间光学载荷支撑结构设计(特邀) |
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| 引用本文： | 丛杉珊,王升,孙美娇,薛志鹏,杨帆,王宇,陈茂胜,张雷.具备调焦功能的空间光学载荷支撑结构设计(特邀)[J].红外与激光工程,2021,50(10):20210476-1-20210476-7. |
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| 作者姓名： | 丛杉珊 王升 孙美娇 薛志鹏 杨帆 王宇 陈茂胜 张雷 |
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| 作者单位： | 长光卫星技术有限公司，吉林 长春 130000 |
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| 基金项目： | 国家重点研究发展计划（2016YFB0500904） |
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| 摘 要： | 由于空间环境变化，高分辨率空间光学载荷在轨会产生不同程度的离焦从而影响成像质量，因此需要进行在轨调焦。为了适应高分辨率、轻小型空间光学载荷发展需求，设计了一种集支撑功能、调焦功能为一体的结构，通过热控系统对支撑结构温度的精准控制来调整次镜组件在光轴方向的位置，从而使载荷具备调焦功能。首先，根据光学系统参数进行调焦精度分析，确定支撑结构的设计要求；然后，基于连续拓扑优化中的变密度法(SIMP)进行支撑结构的全局优化；最后，开展了热光学试验，验证支撑结构的热控调焦功能并测量热控调焦系数。试验结果表明:该光学载荷支撑结构热控调焦系数为0.071 mm/℃，可实现0.014 mm调焦精度和±0.385 mm调焦范围。基于该调焦方法设计的“吉林一号”高分03星已经完成在轨测试，调焦精度和调焦范围满足设计预期。
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| 关 键 词： | 空间光学载荷 支撑结构 热控调焦 热光学试验 |
| 收稿时间： | 2021-07-13 |
Design of support structure for space optical payloads with refocusing function (Invited) |
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| Affiliation: | Chang Guang Satellite Technology Co., LTD., Changchun 130000, China |
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| Abstract: | High-resolution space optical camera defocused in orbit due to the change of space operational environment, which would affect the image quality. Therefore, refocusing were required by the camera in orbit. In order to meet the requirements of high resolution and lightweight space optical camera, a main support structure with both support and refocusing function was designed. The position of the secondary mirror assembly was adjusted along the optical axis by the precise temperature control of the supporting structure, then the camera can be refocused by the thermal control of the supporting structure. Firstly, the refocusing accuracy was analyzed according to the optical system parameters to determine the design requirements of the support structure; Then, the global optimization of the supporting structure was performed based on the variable density of continuous topology optimization (SIMP); Finally, the thermal optical test was performed to verify the thermal refocusing function and measure the thermal refocusing parameters of the apace camera. The experimental results show that the thermal refocusing parameter of the supporting structure is 0.071 mm/℃, the refocusing accuracy and range are 0.014 mm and ±0.385 mm respectively. The proposed method had been used in the design of "Jilin-1"gf03 satellite which had been tested in orbit, and the focusing accuracy and focusing range meet the design expectations. |
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