空间相机热光学分析与试验验证

Thermal-optical Analysis and Tests for High Resolution Space Camera

为了对空间高分辨率相机热设计提出准确的技术要求,基于光学波像差的基本理论,对某高分辨率空间相机的温度场进行热光学分析.在此基础上确定了热控指标,并在真空罐中进行热真空成像试验,验证了热光学分析的正确性和热控指标的合理性.结果表明:最佳焦面位置与相机温度水平的关系近似成线性关系,最佳焦面位置变化量约0.08～0.1mm.℃-1;当温度水平在(20±1)℃之间变化时,像面处在系统焦深范围内,系统传递函数变化量在0.02左右;当径向温差和轴向温差会大于2℃引起最佳焦面位置发生移动,若不调焦,传函会明显下降.

Temperature filed distributing of a high resolution space telescope is analyzed by thermal-optical method based on optical front-wave-error theory,and thermal contral target is ascertained.The thermal tests in the vacuum are carried out to validate the analysis.Tests results indicate that the ideal focal plane position vs temperature level are linearity,and changes scope approximately 0.08～0.1 mm·℃^-1.As the macrocosmic temperature changing within（20±1）℃,system MTF change about 0.02.When the temperature grads are more than 2 ℃ in axis direction and diameter direction,the ideal focal plane position departure happenes and the MTF decline obviously if unfocus.