1 北京理工大学光电学院，北京 100081
2 中国科学院西安光学精密机械研究所，陕西 西安 710119
The empirical findings from this study confirm the superiority of reinforcement learning in formulating effective stray light suppression measures for space gravitational wave detection telescope systems. The approach not only achieves superior suppression outcomes but also introduces an efficient, flexible, and innovative solution to the challenges of stray light in space gravitational wave detection and other high-precision optical systems.
引力波 星载望远镜 杂光抑制 强化学习 gravitational wave spaceborne telescope stray light suppression reinforcement learning
1 辽宁科技大学化学工程学院，辽宁 鞍山 114051
2 大连理工大学建设工程学部，辽宁 大连 116024
3 南京航空航天大学土木工程系，南京 210016
4 辽宁科技大学材冶学院，辽宁 鞍山 114051
旨在提高硫氧镁(MOS)水泥的耐水性，以硅酸作为改性剂引入至MOS体系中，分析了其对MOS水泥力学性能、体积稳定性和耐水性的影响，跟踪了掺入硅酸后的MOS水泥相组成、微观形貌和离子浸出浓度的变化，研究了水化硅酸镁(M-S-H)凝胶与MOS体系的共存性。结果表明：硅酸通过促进5Mg(OH)2·MgSO4·7H2O和水化硅酸镁凝胶的生长，提高MOS水泥的力学性能和体积稳定性。当掺入硅酸的MOS水泥浸水后，未反应的硅酸可持续与游离的Mg2+和OH-反应形成M-S-H凝胶，且5Mg(OH)2·MgSO4·7H2O和M-S-H凝胶具有良好的共存性，致使MOS水泥的耐水性提高。
硫氧镁水泥 硅酸 耐水性 水化产物 微观形貌 magnesium oxysulfate cement silicic acid water resistance hydration product microstructure
北京理工大学 光电成像技术与系统教育部重点实验室，北京
偏振成像是一种新型光电探测方法。相比于传统的强度成像，偏振成像可以进一步获取目标的偏振特性，从而提高对比度，增加识别概率。偏振成像在生物医疗、工业检测、地球遥感、现代**以及海洋和航空领域具有重要应用价值。文中对偏振成像系统的成像方式进行分类和比较，总结了偏振成像的实现方法。在此基础上，根据不同偏振成像系统的特点，针对不同的应用背景，对偏振成像系统的未来发展方向进行了展望，包括基于超表面的新型偏振成像系统以及新型偏振成像光谱系统等。
偏振成像 分时成像 实时成像 超表面偏振成像 polarization imaging time-sharing imaging simultaneous imaging metasurface polarization imaging
1 北京理工大学 光电学院 光电成像技术与系统教育部重点实验室，北京 100081
2 中国兵器工业标准化研究所，北京 100089
针对传统显微镜在低照度环境时成像对比度低、识别难度大等问题，提出结合分焦平面偏振成像技术，设计了一款含三个移动组的五组元连续变焦偏振视频显微物镜。该物镜工作在可见光波段，变倍范围为1×?6.5×，物方线视场1.70 ~11.1 mm，全长220 mm，工作距离为22 mm，后截距为14 mm，后接偏振探测器获得目标的偏振信息。经仿真分析，该系统在变焦范围内像面稳定，在各个变焦状态下成像质量接近衍射极限。该系统不仅可以在显示屏上获得目标的不同放大倍率的像，缓解视疲劳，还可以获得目标的偏振信息，提高目标的识别概率、观察效率和低照度情况下的成像效果。
连续变焦 偏振成像 视频显微镜 光学设计 continuous zoom polarization imaging video microscope optical design 红外与激光工程
2020, 49(8): 20200003
1 北京理工大学 光电学院 光电成像技术与系统教育部重点实验室，北京 100081
2 中国科学院 长春光学精密机械与物理研究所，吉林 长春 130033
本文设计了一种用于婴幼儿视网膜筛查的广域眼底相机。文中对该系统所包含的照明系统、成像系统的设计方法进行了探讨。首先，根据James Polans宽视场人眼模型和婴儿眼解剖学数据,建立了婴儿眼模型。接着，提出新的锥形光纤方案用于大视场照明。最后，重点介绍了广域眼底相机的成像系统（包括接触镜、中继物镜）的设计方法。设计实例表明：广域眼底相机的视场可以达到130°，对眼底的物方分辨率可以达到10 μm。设计结果符合眼底成像设备国家标准YY0634-2008，满足婴幼儿视网膜筛查的要求。
光学设计 广域视网膜成像 医用光学 optical design wide-area retinal imaging medical optics 
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
1 北京理工大学 光电学院, 北京 100081
2 中国空空导弹研究院, 河南 洛阳 471000
3 航空制导武器航空科技重点实验室, 河南 洛阳 471000
传统整流罩为半球形或半球形的一部分, 产生的空气阻力较大, 不利于**飞行速度的提高。基于空气动力学性能的考虑, 采用共形整流罩的光学技术被提出。文章描述了二次曲面共形整流罩外表面、内表面的设计方法及面型表达式, 通过在CODEV中建立共形整流罩的扫描成像模型, 应用Zernike多项式分解法研究了不同长径比、边缘斜率、口径比和回转中心位置对离焦像差(Z4)、像散(Z5)、彗差(Z8)和球差(Z9)的影响规律。研究结果表明: 二次曲面共形整流罩引入的离焦像差、像散、彗差和球差均随着长径比、边缘斜率和口径比的增加而增大, 但对成像系统回转中心的位置不敏感。因此, 在满足**的空气动力学性能条件下应尽量减小长径比、边缘斜率和口径比, 回转中心的位置主要根据结构需要进行设计。
光学设计 共形光学 共形整流罩 二次曲面 Zernike像差 optical design conformal optics conformal domes quadric Zernike aberration
Author Affiliations
Abstract
1 School of Physics Science and Information Technology and Shandong Key Laboratory of Optical Communication Science and Technology, Liaocheng University, Liaocheng 252000, China
2 School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shandong University, Jinan 250100, China
Multi-component and multi-point trace gas sensing in the wavelength modulation spectroscopy is demonstrated based on the frequency-division multiplexing and time-division multiplexing technology. A reference photodetector is connected in series with a reference gas cell with the constant concentration to measure the second-harmonics peak of the components for wavelength stabilization in real time. The central wavelengths of the distributed feedback lasers are locked to the target gas absorption centers by the reference second-harmonics signal using a digital proportional-integral-derivative controller. The distributed feedback lasers with different wavelengths and modulation frequencies are injected into the gas cell to achieve multi-components gas measurement by the frequency-division multiplexing technology. In addition, multi-point trace gas sensing is achieved by the time-division multiplexing technology using a photoswitch and a relay unit. We use this scheme to detect methane (CH4) at 1650.9 nm and water vapor (H2O) at 1368.597 nm as a proof of principle with the gas cell path length of 10 cm. The minimum detection limits achieved for H2O and CH4 are 1.13 ppm and 11.85 ppm respectively, with three-point gas cell measurement; thus 10.5-fold and 10.1-fold improvements are achieved in comparison with the traditional wavelength modulation spectroscopy. Meanwhile, their excellent R-square values reach 0.9983 and 0.99564 for the concentration ranges of 500 ppm to 2000 ppm and 800 ppm to 2700 ppm, respectively.
Wavelength modulation spectroscopy wavelength stabilization multi-point multi-component trace gas sensing Photonic Sensors
2019, 9(4): 376
1 北京理工大学 光电学院， 北京 100081
2 深圳市宝安区人民医院， 广东 深圳 518100
为解决传统牙科三维扫描仪扫描中的抖动问题，提出了一种基于相机阵列的新型牙科三维扫描仪。利用多个不同视场的相机可以直接单次照相获取目标的三维信息，避免了扫描过程中抖动带来的影响，提高系统实时性。由于牙齿尺寸较小，所以选择微透镜阵列代替大型相机阵列，在减小系统体积的同时可以更好地保证相机间光轴的平行度。实验结果显示，系统最终实现了单颗牙齿的视差和深度计算。系统结构简单，便于小型化和低成本口内牙齿三维测量设备的研制，进一步推进医学数据的数字化进程。
牙科扫描仪 相机阵列 立体视觉 dental scanner camera array stereo vision
Author Affiliations
Abstract
1 School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
2 University of Chinese Academy of Sciences, Beijing 100853, China
3 Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
This Letter proposes a snapshot imaging spectrometer, which obtains the spectral information and spatial information in one “shot”. The device proposed can achieve the data cube size of 21×29×40 in the waveband of 400–800 nm. The core element of this system is the microlens array, which contains 60×60 microlenses in a square arrangement, each microlens has an aperture of 125 μm×125 μm, and the F number is 15. The microlens array is mounted in a rotation mount, which provides 360° of rotation around the optical axis to maximize the spectral resolution. The final resolution of the system is about 10 nm.
110.4234 Multispectral and hyperspectral imaging 120.4640 Optical instruments 300.6190 Spectrometers Chinese Optics Letters
2019, 17(1): 011101
