浏览全部资源
扫码关注微信
中国科学院 长春光学精密机械与物理研究所,吉林 长春,中国,130033
[ "刘磊(1972-),男,吉林长春人,副研究员,1994年于大连理工大学获得学士学位, 2006年于中科院长春光学精密机械与物理研究所获得硕士学位,主要从事空间相机结构设计." ]
收稿日期:2012-02-15,
修回日期:2012-05-16,
网络出版日期:2013-03-20,
纸质出版日期:2013-03-15
移动端阅览
刘磊. 空间三反相机调焦范围的确定[J]. 光学精密工程, 2013,21(3): 631-636
LIU Lei. Focusing range of space off-axial TMA optical camera[J]. Editorial Office of Optics and Precision Engineering, 2013,21(3): 631-636
刘磊. 空间三反相机调焦范围的确定[J]. 光学精密工程, 2013,21(3): 631-636 DOI: 10.3788/OPE.20132103.0631.
LIU Lei. Focusing range of space off-axial TMA optical camera[J]. Editorial Office of Optics and Precision Engineering, 2013,21(3): 631-636 DOI: 10.3788/OPE.20132103.0631.
为了提高空间相机对温度的适应能力,改善相机成像质量,研究了如何通过调焦放宽相机的热控指标,降低相机热控难度的问题。推导出了纯反射离轴三反光学系统中后截距及相机受温度影响下焦面离焦的数学公式;分析证明了相机离焦量与温度变化是线性关系,并计算得到了常数项K值。计算显示,当反射镜材料的线胀系数与相机支撑框架材料线胀系数一致时,焦面不产生离焦;而两种材料线胀系数差距越大,离焦量就越大。利用离焦传递函数公式证明了当相机温度水平变化超过1 ℃时(对应离焦量0.05 mm),就必须采用机械调焦的方法对其加以补偿;利用光机热集成仿真的方法,得出保证相机成像质量的温度范围t,完成了从光学指标到温度指标的转换 。利用离焦公式,得出了相机的调焦范围。最后,在热真空环境下试验验证了上述焦面离焦的数学公式及相机温度水平变化4 ℃时离焦量为0.184 mm是相机合适的调焦范围。
To improve the adaptive capacity of a space camera to environment temperatures and to enhance its imaging quality
this paper explores how to implement the thermal control by relaxing thermal control indictors. A mathematical formula of intercept and defocus affected by temperatures is derived for a pure off-axis Three Mirror Anastigmatism(TMA) optical system. The analysis shows that camera defocus amount and temperature are a linear relationship. Then
a constant K value is calculated. Furthermore
it indicates when reflector and camera structures have the same coefficient of linear expansion
the defocus does not occur. However
the greater the difference between two material linear expansion coefficients is
the greater the amount of defocus is. With defocusing formula
it suggests that mechanical focusing methods must be used to request for compensation when the camera temperature level changes more than 1 ℃(corresponding to the defocus amount of 0.05 mm). Using integrated photo-thermal simulation method
the temperature range t is obtained to ensure the image quality of the camera. Finally
cameras focus range is derived by using the formula of defocus. The result of defocus test under thermal vacuum environment verifies the correctness of the defocus formula and the defocus amount of 0.184 mm is a proper focus range corresponding camera temperature levels changed in 4 ℃.
常军,翁志成.宽覆盖、离轴空间相机光学系统的设计[J]. 光学 精密工程, 2003,11(1):55-57.CHANG J,WENG ZH CH. Design of optical system in wide cover,off-axial space camera[J].Opt. Precision Eng.,2003,11(1):55-57.(in Chinese)[2]赵文才. 改进的离轴三反光学系统的设计[J]. 光学 精密工程, 2011, 19(12):2837-2843. ZHAO W C.Design of improved off-axial TMA optical systems[J].Opt. Precision Eng.,2011, 19(12):2837-2843. (in Chinese)[3]JURANEK H J,SAND R,SCHWEIZER J, et al.. Off axis telescope-the future generation of earth observation telescopes[J]. SPIE, 1998,3439:104-115.[4]张洪文.空间相机调焦技术的研究[D].长春:长春光学精密机械与物理研究所,2003.ZHANG H W.Research on the Auto Focusing Technology for Space Camera [D].Changchun:Chang chun Institute of Optics,Fine Mechanics and Physics,2003.(in Chinese)[5]丁亚林,田海英,王家骐.空间遥感相机调焦机构设计[J]. 光学 精密工程, 2001,9(1): 35-38. DING Y L, TIAN H Y, WANG J Q. Design on the focusing mechanism of space remote-sensing camera [J]. Opt. Precision Eng., 2001, 9(1): 35-38. (in Chinese)[6]王智,张立平,李朝辉,等.传输型立体测绘相机的调焦机构设计[J].光学 精密工程,2009,17(5) :1051-1056.WANG ZH, ZHANG L P, LI ZH H, et al.. Design of focusing mechanism of space tridimensional mapping camera [J]. Opt. Precision Eng., 2009, 17(5): 1051-1056. (in Chinese)[7]VERHOEFF P,MIERLO H A ,BRAAM B C,et al.. Development of an in-orbit refocusing mechanism for the meteosat second generation weather satellites [J]. SPIE,1998,3439:92-103.[8]迪特恩. 现代几何光学[M].长沙:湖南大学出版社,2004.RICHARD D. Modern Geometrical Optics[M].Changsha: Hunan University Press, 2004. (in Chinese)[9]许求真. 经典卡塞格林系统热差分析[J]. 激光与红外, 2011, 4:435-441. XU Q ZH. Analysis on thermal difference of classical Cassegrain system[J]. Laser & Infrared, 2011, 4:435-441. (in Chinese)[10]JUERGENS R C,CORONATO P A.Improved method for transfer of FEA results to optical codes [J].SPIE,2003,5174:105-115.[11]陈长征,赵贵军,等.空间光学镜头可适应边界温度的CAE计算方法[J]. 光学 精密工程,2007,15(5): 668-673.CHANG CH ZH,ZHAO G J, et al.. A calculating method for temperature tolerance of space telescope [J]. Opt. Precision Eng., 2007, 15(5): 668-673. (in Chinese)
0
浏览量
186
下载量
9
CSCD
关联资源
相关文章
相关作者
相关机构