Author Affiliations
Abstract
1 School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
2 Aviation Key Laboratory of Science and Technology on Airborne Guided Weapons, Luoyang Optoelectro Technology Development Center, Luoyang 471009, China
3 Key Laboratory of In-fiber Integrated Optics, Ministry of Education, Harbin Engineering University, Harbin 150001, China
Traditional optical domes are spherical, which have a large air resistance coefficient. In order to reduce the coefficient of air resistance, conformal optical technology was proposed, which used a streamlined design of the outer surface of the dome. However, conformal domes generate dynamic aberrations varying significantly with look angles in the field of regard (FOR). Thus, correcting the dynamic aberrations is the core task of conformal optics. This Letter presented a correcting method of dynamic aberrations based on the diffraction surface and anamorphic asphere surface. This method is derived from the arch corrector and can only be used on the Roll-Nod gimbal. For the seeker with a Roll-Nod gimbal, the arch corrector is replaced with a diffractive surface superimposed on the inner surface of the conformal dome. To correct astigmatism, which is the main aberration that needs to be corrected, anamorphic asphere surfaces are used in the imaging system. Compared with the arch corrector, this method can reduce the size of the correction element while retaining sufficient design freedom. Design results show that this method can well correct the dynamic aberrations in a larger FOR. With a simpler form in structure, this method can improve the reliability of conformal optical systems and promote the application of conformal optical technology.
conformal dome aberration diffraction anamorphic asphere Chinese Optics Letters
2020, 18(7): 072201
哈尔滨工业大学 空间光学工程研究中心, 黑龙江 哈尔滨 150001
气动加热的高温整流罩会产生强烈的红外辐射, 影响导引头对目标的探测精度。为了寻求减弱整流罩气动热辐射的方法, 建立了气动热辐射数学模型。利用有限元软件以及建立的气动热辐射数学模型对不同厚度的半球形整流罩气动热和气动热辐射进行了数值仿真, 得到了半球形整流罩厚度对气动热和气动热辐射的影响规律。研究结果表明, 在相同飞行工况下, 工作10 s时, 当半球形整流罩厚度由3 mm增厚到8 mm, 整流罩驻点温度降低了16.23%; 形变量减少了54.2%; 探测器接收面上的最大辐照度减少了84.43%。因此增加整流罩的厚度可以降低整流罩的温度, 有效减小整流罩的热形变和探测器上接收到的干扰辐射照度。
气动热辐射 半球形整流罩 厚度 aerodynamic thermal radiation hemispherical dome thickness 红外与激光工程
2018, 47(12): 1204002
哈尔滨工业大学空间光学工程研究中心, 黑龙江 哈尔滨 150001
椭球形整流罩产生较大的空气阻力，限制了精确制导**的作战性能。以减小空气阻力为主要目标，针对二次曲面共形光学整流罩进行研究，设计综合性能较为完善的整流罩面型。应用计算流体力学方法，计算了共形整流罩的空气阻力系数，建立了共形整流罩空气阻力评价函数。基于光线追迹理论，以不同目标视场下的平均波前误差作为像质评价指标，构建了共形整流罩像质评价函数。以雷达散射理论为基础，计算了整流罩的雷达散射截面积，给出了共形整流罩雷达散射特性评价函数。结合空气阻力、光学成像质量和雷达散射特性，建立了二次曲面共形整流罩综合性能评价函数，确立了长径比为1.5的抛物线型整流罩具有较好的综合性能。相比椭球形整流罩，该抛物线形整流罩减少了约1/3的空气阻力。
几何光学 共形光学 整流罩 二次曲面 光学学报
2014, 34(12): 1222006
