摘要
为了克服空间环境剧烈的温度变化,利用有限元模型分析计算了星载三线阵相机在不同温度状态下的镜面面型畸变与筒长变化,并用输出的泽尼克(Zernike)系数表示畸变,将得到的Zernike系数与筒长变化量拟合入CODE V光学设计软件,进一步分析了光学系统在不同温度状态下的调制传递函数(MTF)曲线的下降;结合目标光学参数提出2℃温控指标。针对轴向温差温控指标的各种温度水平制订实验工况,对星载三线阵相机分工况进行热光学实验,测得的实验室静态传递函数都达到或接近目标值0.2,将测得的MTF值和理论分析结果相比较,验证了温控指标与温控手段的合理性。
The surface distortion and tube length changes of three-line CCD camera at different temperatures were analyzed with finite element model.the Zernike coefficients from finite element model were put into optical-design software CODE V to calculate the decline of modulation transfer function（MTF）,and the 2 ℃ temperature indicators were made by optical parameters.Thermal optical experiment was done for a variety of temperature levels on the three-line CCD camera,and the measured static transfer function of the laboratory are at or close to target 0.2.The MTF of experiment was measured and compared with the result of theoretical analysis to affirm the temperature indicators and temperature control means were reasonable.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2010年第7期2017-2021,共5页
Acta Optica Sinica
关键词
热光学
三线阵相机
有限元模型
调制传递函数曲线
thermal optics
three-line CCD camera
finite element model
modulation transfer function curve
