A common reference calibration method was proposed for the precision alignment of off-axis two-mirror optical systems with adjustable focus,which ensured that the guide rail and the optical axis of the primary and secondary mirrors were precisely aligned with the same reference,and realized the parallel movement axis of the guide rail and the optical axis of the primary and secondary mirrors.The consistency debugging of the optical axis was completed through two parts:initial adjustment and fine adjustment.The initial adjustment realized that the primary and secondary mirrors were basically located in the theoretical installation position,reducing the adjustment errors.Then,the computer-aided adjustment was performed to achieve precise adjustment of optical axis consistency of the primary and secondary mirrors,so that the system wave aberration met the requirements.The experimental results show that the wave aberration root mean square(RMS)of the infinitely distant system reaches(1/15)λ(λ=632.8 nm),the system has a diffraction resolution of 0.64",and the system is focused to 10 mm.The measured focal length of the primary and secondary mirror system is 1 608 mm,and the system resolution reaches 2.6",which meets the design requirements.

机载光电稳瞄平台受飞机作战环境的干扰因素,会引起设备环架的振动,对光电平台载荷视轴的稳定性及跟踪精度影响很大,减振的主要任务是有效隔离环境振动.与传统橡胶减振器比较,文章提出了一种新型机载光电稳瞄平台的柔性减振设计.并通过ANSYS仿真软件对新的减振模型进行了模态仿真分析,通过振动试验对设计的性能进行了有效评估,测试结果与仿真评估误差为0.56％,说明该设计对机载光电稳瞄平台具有减振性.

结合光学被动无热化和机械被动无热化各自优势,提出一种低成本、高质量混合被动无热化方法.针对焦距75 mm,F/1的无热化镜头研制要求,分别利用光学被动无热化和混合被动无热化设计实现.对比发现,相较于传统的机械被动式无热化,混合无热化可减小补偿结构的体积和复杂性,从而有助于系统的小型化、轻量化;相较于光学被动无热化,在保证成像质量相当的情况下,可减小系统的体积和加工难度.从而证实,利用混合被动无热化技术可实现低成本、高质量的长波无热化镜头设计.

Aiming at the problem of high tolerance sensitivity and difficult adjustment of 30 times continuous zoom TV, the effects of eccentricity on the MTF (modulation transfer function) of the optical system were analyzed by optical software. The results show that the central error of the front mirror group is sensitive to the asymmetric aberration. In this paper, the structural form of the spacer ring machine program is optimized, so that the lower surface of the lens is automatically centering. As the moving component of the system, both zoom lens group and compensation lens group are the key factors affecting the system image quality during the zooming process. In this paper, mechanical centering tooling is used to make the central axis of the moving assembly parallel to the axis of the guide rod. The optical axis of all components is corrected by the optical axis of the front mirror group. The optical system is precisely adjusted, and the optical resolution of the small field of view reaches 2.43″, which is close to the limit of diffraction resolution.

空间旋转多光轴系统光轴平行性影响系统指向精度且校准难度高、耗时.基于空间旋转多光轴系统光轴校准原理,获得了校准理论模型;结合实验研究,建立了高精度光轴校准方案;以机械回转轴为基准,粗调准和精调准结合,以调整传感器安装面为粗调,借助双光楔实现光学量级的精校准;先校正可见光光轴与机械回转轴的平行性,再保证激光光轴与机械回转轴的平行性,最终保证可见光光轴与激光光轴的平行性.试验结果表明,该校准方案精度高,指标优于0.1 mrad,可用于实际工程装调.

The main object of this paper is precise alignment and inspection process technology for reflecting collimator with focus length of 4 000 mm and aperture diameter of 400 mm.As the detection and calibration datum of a certain type of optical system, this reflecting collimator has a very high demand in system imaging quality, resolution and beam parallel difference.Therefore, this paper focuses on key processes such as micro-stress bonding method, spacing precise adjustment method, optical axis consistency adjustment method of primary and secondary mirror of the Cassegrain system.Then precise alignment and inspection is carried out with optical self-collimation method.Final system resolution of reflecting collimator is better than or equal to 0.8 second, the parallel deviation is better than or equal to 3 seconds, star energy is concentrated without obvious aberration, and vertical line of cross-graduation could be perpendicular to the base plane.Results show that optical self-collimation method used in reflecting collimator can meet design requirements.

介绍卡塞格林系统非球面主镜使用三坐标测量仪进行定心装调的方案.系统的主镜口径为300 mm,需要使用结构胶进行胶结固定,选用微应力粘接方法,将胶层粘接应力与热应力变形控制在极小的范围内.利用ZYGO干涉仪获得光学系统的波前信息,将测得的波相差转化为初级像差,根据光学系统失调量与像差的关系对卡塞格林系统进行计算机辅助装调.调试后,系统的RMS值达到0.10λ,分辨率达到1″以内,检测结果表明:该系统的成像质量接近理论衍射分辨率,该方案可以实现快速定心,并且能够满足计算机辅助装调对定心精度的要求.

In order to adjust the optical axes in the multi-sensor electro-optical system ,a kind of new calibration device with a wide span of spectral-axes is introduced ,of which working princi-ple are described in detail .The Cassegrain system is the core of this device ,whose primary mirror uses a new kind of adhesive and optical-centering techniques to relieve deformation ,and the experimental results verify the feasibility of the proposed techniques .In addition ,by pre-cisely adjusting the Cassegrain system and multi-axes of detecting optical paths ,the detection precision of this new calibration device can up to 10" theoretically .Therefore ,using the pro-posed device and the large aperture off-axis reflective collimator ,the parallelism of optical axes of multi-sensor electro-optical system can be calibrated precisely in different environments .

The traditional vane plumbs with the inside surface of a baffle,but the new-style vane designed in this paper inclines toward the inside surface of a baffle.The reflective light from the incident parasitic light and part of the stray light is blocked in the interbedded space of the newstyle vanes and inside surface of baffle to be attenuated,and most of the residual light is retro-transmitted to the optic system,so just tiny stray light is able to arrive at the detector.The inclining angle α of the new-style vane must keep the distribution that α is bigger than β which is the included angle of the incident stray light with the baffle.Only by the distribution can the inclining stray light be avoided to arrive at the optic system directly.Taking the Cassegrain space camera as an example,two types of vanes were set up respectively within external baffles of the two cameras,and then the modeling and simulation for the two structures were performed by the aid of Tracepro software.The results show that the space camera with the new vane is 4 grades higher than that with the traditional vane.

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