CAJ | 학술논문

机载光电平台光学镜头前的通光窗口须选用内外球心重合的等厚球形玻璃球罩,这是由于球罩在加工过程中产生的内外表面球心不重合会给视轴指向精度带来附加误差.本文根据光路图推导出了产生这种误差的数学表达式,分析了内外球心偏离对视轴指向精度的影响,进行了相关实验并对实验数据进行处理.实验结果表明,实测数据与数学理论推导结果吻合得很好.当某机载光电平台球罩的内外表面球心沿视场中心线的偏离达到0.26 mm时,45°视场处的视轴指向误差实测值达到0.075°,超出了0.029°(0.5 mrad)的允许值.为了将球罩加工误差带来的视轴指向偏差减小到理想值0.017°(0.3 mrad)以内,内外球心偏离必须控制在0.10 mm以内.根据分析结论重新加工了球罩内外表面,将球罩内外球心偏离控制在0.1 mm以内后,视轴误差均满足要求.
궤재광전평태광학경두전적통광창구수선용내외구심중합적등후구형파리구조,저시유우구조재가공과정중산생적내외표면구심불중합회급시축지향정도대래부가오차.본문근거광로도추도출료산생저충오차적수학표체식,분석료내외구심편리대시축지향정도적영향,진행료상관실험병대실험수거진행처리.실험결과표명,실측수거여수학이론추도결과문합득흔호.당모궤재광전평태구조적내외표면구심연시장중심선적편리체도0.26 mm시,45°시장처적시축지향오차실측치체도0.075°,초출료0.029°(0.5 mrad)적윤허치.위료장구조가공오차대래적시축지향편차감소도이상치0.017°(0.3 mrad)이내,내외구심편리필수공제재0.10 mm이내.근거분석결론중신가공료구조내외표면,장구조내외구심편리공제재0.1 mm이내후,시축오차균만족요구.
A concentric glass spherical shell with a uniform thickness is usually chosen as the transparent window mounted in front of the optical lens of an airborne opto-electronic platform,becaused the misalignment of the spheric centers on inside and outside surfaces produced by the fabrication can cause additional pointing errors.In this paper,the theoretical expression of addition pointing error based on an optical path is derived and the effect of the misalignment of the spheric centers on inside and outside surfaces on the pointing accuracy of a sight axis is analyzed.Several kinds of experiments are undertaken and the data processing result of the experiment indicates that the measurement results are in agreement well with the theoretical results.When the concentric misalignment of a spherical center is 0.26 mm,the axial pointing error at a 45° field of view reaches 0.075°,which is higher than the error limitation 0.029° (0.5 mrad).Analyzed results also show that the concentric misalignment should be controlled below to 0.10 mm in order to reduce the pointing error to 0.017°(0.3 mrad).Based on the analyzed results,the inside and outside surfaces of the spherical shell is reprocessed,the experimental results demonstrate that the pointing error is acceptable when the concentric misalignment is controlled in 0.10 mm.