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Design and simulation of far infrared pixel type subwavelength double polarization grating 远红外像元型亚波长双偏振光栅的设计与仿真
Yinzi Wu, Lihong Yang, Guanwen Chen, Z. Xue, Menghan Li
Polarization imaging is one of the important means of target detection and recognition, and the polarization device is the core of the system.In this paper, based on Stokes theory, a far infrared polarizing device---Two dimensional four direction array subwavelength double layer grating,is designed, which can be used for real-time measurement. Based on the equivalent medium theory, the size parameters of the micro unit are calculated.On the basis of the initial parameters, the micro cell structure is simulated and optimized.Finally, the simulation results show that the TM transmittance of the optimized double-layer grating structure is about 12% higher than that of the original one, reaching more than 90%,the extinction ratio is 25.8dB.
偏振成像是目标检测和识别的重要手段之一,偏振装置是该系统的核心。本文基于Stokes理论,设计了一种可用于实时测量的远红外偏振器件——二维四方向阵列亚波长双层光栅。基于等效介质理论,计算了微单元的尺寸参数。在初始参数的基础上,对微胞结构进行了仿真和优化。最后,仿真结果表明,优化后的双层光栅结构的TM透过率比原结构提高了约12%,达到90%以上,消光比为25.8dB。
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引用次数: 0
Suppressing the edge roll off in continuous polishing of large planar optics by using extension blocks 利用延伸块抑制大型平面光学连续抛光中的边滚
Lele Ren, Fei-hu Zhang, D. Liao, R. Xie, Shi-jie Zhao, Jian Wang
The edge roll off seriously restricts the further improvement of the overall surface figure accuracy in CP of large planar optics. Firstly, the half width and depth of large planar optics’ edge region is proposed to quantify the roll off degree by analyzing its radial equivalent profile. Then, a two-dimensional symmetrical model of the large planar optics and the pitch lap is established. Next, based on the finite element model, the influence of extension block’s bonding state on the large planar optics edge’s stress concentration is analyzed. Finally, the effectiveness of this proposed method is verified by CP of large planar optics with extension blocks.
在大型平面光学系统中,边滚问题严重制约着整体曲面精度的进一步提高。首先,通过分析大平面光学元件的径向等效轮廓,提出了大平面光学元件边缘区域的半宽度和半深度来量化滚转程度;然后,建立了大平面光学与俯仰搭接的二维对称模型。其次,在有限元模型的基础上,分析了延伸块的粘结状态对大平面光学边缘应力集中的影响。最后,通过带扩展块的大型平面光学元件的CP验证了该方法的有效性。
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引用次数: 0
Ground experiment of a 50 mm balloon-borne coronagraph for near space project 近空工程50毫米气球日冕仪地面试验
Yu Liu, Xuefei Zhang, Tengfei Song, Mingzhe Sun, Dayang Liu, Jingxing Wang, M. Zhao, Tao Zhang, Fang-Wei Xu, Honglin Fu, Xiao-ping Pi, Shan Huang, Yan Li, Yu Fu, Jian-Bin Fan, Shun-Fang Liu, Yuandeng Shen, Fei Sha, Yuqiang Li, Zhen-yu Jin, Zhong Liu, L. Xia, Hongxin Zhang, Min Huang, Yang Liu, Min Wang, Sha-Sha Li, Jun Lin
We briefly report on the development of a 50 mm balloon-borne coronagraph and its recent ground experiment results made at the high altitude (4800 m above the sea level) site of Mt. Wumingshan in Daocheng, Sichuan of China. The main scientific purpose for developing this coronagraph is to investigate the morphology and dynamics of low-layer coronal structures before and during solar eruptions by observing at a float altitude of about 30 km from 1.08 Rsun to 1.5 Rsun at white light wavelength (centered at 550.0 nm, bandwidth 5 nm). The instrument is an internally occulted Lyot coronagraph developed by Yunnan Observatories in collaboration with Shangdong University (in Weihai) and Changchun Institute of Optics, Fine Mechanics and Physics. The coronagraph was designed with scattered light intensity level of better than 1×10-5 Isun in the inner field of view. A filter wheel system with linear polarizers and an sCMOS camera provided polarization and total brightness images of size 2048 x 2048 pixels. The first successful results were taken on February 27, 2021 in the Daocheng site. This coronagraph experiment obtained coronal images only showing obvious coronal structures very near limb. Furthermore, during the end of March and early April, after improving the polarizer filter system, higher-quality coronal images with pB coronal structures appeared in the full field of view were obtained in our ground-based experiments. Comparison between our results and the other coronal data in the world are discussed. The success of the 50 mm coronagraph in ground experiments is a milestone for us to develop the next-generation large-aperture coronagraph, as well as for future near space projects.
本文简要介绍了50毫米气球日冕仪的研制及其最近在中国四川稻城武明山高海拔(海拔4800米)站点进行的地面试验结果。研制该日冕仪的主要科学目的是通过在白光波长(中心550.0 nm,带宽5 nm)的1.08 ~ 1.5 Rsun范围内约30 km的浮子高度观测,研究太阳爆发前和爆发期间低层日冕结构的形态和动力学。该仪器是由云南天文台与山东大学(威海)和长春光学精密机械与物理研究所合作开发的内掩Lyot日冕仪。日冕仪内部视场散射光强水平优于1×10-5 Isun。采用线性偏光镜和sCMOS相机组成的滤光轮系统,可获得2048 x 2048像素的偏振和总亮度图像。第一次成功的结果于2021年2月27日在稻城站点进行。本实验获得的冠状图像仅显示非常接近肢体的明显冠状结构。此外,在3月底和4月初,在我们的地面实验中,通过改进偏光滤光系统,获得了全视场中出现pB日冕结构的更高质量的日冕图像。并与世界上其他日冕资料进行了比较。50毫米日冕仪在地面实验中的成功,对我们开发下一代大口径日冕仪以及未来的近空间项目具有里程碑式的意义。
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引用次数: 0
Design of high-performance ternary ammonia gas sensors based on Au NPs hybrid PANI-TiO2 nanocomposites on flexible polyimide substrate 基于柔性聚酰亚胺基Au - NPs杂化PANI-TiO2纳米复合材料的高性能三元氨气传感器设计
Gangrong Chen, Yongfeng Yuan, Haibin Zhang, Ming Lang, Yuntao Cheng
Here, an effective and economic ternary ammonia gas sensor with Au nanoparticles (NPs) hybrid polyaniline (PANI)- titanium dioxide (TiO2) nanocomposites on a flexible polyimide substrate has been successfully fabricated. In this work, high catalytic and controllably synthesized near-spherical Au NPs with size of sub-100 nm was interestingly employed, meanwhile, a facile in-situ oxidative polymerization was used to composite the Au NPs with the conventional binary PANI- TiO2. Analysis and characterization of the structures, compositions, and the gas-sensing performances of the designed ternary ammonia gas sensor were systematically explored. The results show that the Au and TiO2 NPs were evenly distributed among the PANI fibrous networks, favoring the construction of the practical gas sensors. Besides, the gas sensor with 1 wt% of Au and 20 mol% of TiO2 dispersed into PANI showed an excellent gas-sensing performance: the response and recovery rates of the sensors respectively reach 32 s and 111 s to 100 ppm concentration of ammonia at room temperature, and the response value approach to 123%, which is approximately 1.9 times and 1.2 times higher than the pure PANI and PANI-TiO2. Furthermore, the designed gas sensors exhibited significant stability, selectivity and response-concentration linearity (correlation coefficients R2=0.9984). It is expected that our concerned and designed ternary gas sensors may find great potential applications such as in flexible wearable devices and the medical health monitors.
本文在柔性聚酰亚胺衬底上成功制备了一种高效、经济的三元氨气传感器,该传感器采用金纳米粒子(NPs)杂化聚苯胺(PANI)-二氧化钛(TiO2)纳米复合材料。本研究采用高催化和可控的方法合成了尺寸在100 nm以下的近球形金纳米粒子,同时采用原位氧化聚合的方法将金纳米粒子与传统的二元聚苯胺-二氧化钛复合。对所设计的三元氨气传感器的结构、组成和气敏性能进行了系统的分析和表征。结果表明,Au和TiO2纳米粒子均匀分布在聚苯胺纤维网络中,有利于构建实用的气体传感器。此外,当Au质量分数为1 wt%, TiO2质量分数为20 mol%分散到PANI中后,气体传感器表现出优异的气敏性能:在室温下,对100 ppm氨气的响应速率和回收率分别达到32 s和111 s,响应值接近123%,分别是纯PANI和纯PANI-TiO2的1.9倍和1.2倍。此外,所设计的气体传感器具有显著的稳定性、选择性和响应浓度线性(相关系数R2=0.9984)。预计我们所关注和设计的三元气体传感器在柔性可穿戴设备和医疗健康监测等方面有很大的应用潜力。
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引用次数: 1
Design and application of on-line laser perforating device for tipping paper 纸头激光在线打孔装置的设计与应用
Xiaohang Zhang, Zhibin Zhang, Jifeng Wang, Ling Zhong, Wei Rao, Chungning Deng, Jingqiang Jiang, Z. He
Since the hole distance, quantity of holes, size, etc. of the pre-perforated tipping paper cannot be adjusted during production, the problems caused by the its function is: on the one hand, the filter ventilation rate cannot be adjusted in real time with low stability; on the other hand, the corresponding consumption and cost of the raw materials are high. Therefore, an online laser perforating device is designed. By directly performing 360° laser perforation on the surface of the semi-finished cigarette, the stability of the ventilation rate of the cigarette filter can be effectively controlled and the production cost can be reduced. The application results shown that the use of online laser perforation device, by adjusting the perforation time, quantity and size of the hole, the average pass rate of the filter ventilation rate has increased by 17.3%, and the standard deviation pass rate has increased by 10.8%, which effectively improves the stability of ventilation rate for the filter. The average consumption cost of the materials for every 10,000 cigarettes of a certain brand is reduced by 41.2%, which effectively reduces the cost of cigarettes, and can set the different quantity of perforating holes and the filter ventilation rate values according to process requirements.
由于在生产过程中无法对预穿孔翻纸的孔距、孔数、尺寸等进行调整,其功能带来的问题是:一方面无法实时调节过滤器通风量,稳定性不高;另一方面,相应的原材料消耗和成本较高。为此,设计了一种在线激光射孔装置。通过直接在半成品卷烟表面进行360°激光打孔,可以有效控制卷烟过滤嘴通风量的稳定性,降低生产成本。应用结果表明,使用在线激光穿孔装置,通过调整穿孔时间、穿孔数量和孔径大小,滤料通风量平均通过率提高17.3%,标准差通过率提高10.8%,有效提高了滤料通风量的稳定性。某品牌每万支卷烟平均材料消耗成本降低41.2%,有效降低卷烟成本,并可根据工艺要求设定不同的穿孔数量和过滤嘴通风量值。
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引用次数: 1
Study on the stress field characteristics of single crystal silicon irradiated by composite high-energy pulsed laser 复合高能脉冲激光辐照单晶硅的应力场特性研究
Z. Xue, Lihong Yang, Yinzi Wu, Guanwen Chen, Menghan Li
This paper adopts the method of numerical theoretical calculation and experimental simulation. The stress field characteristics under the interaction of 1064nm and 532nm composite pulse laser and single crystal silicon are studied and analyzed. Based on Fourier's heat conduction equation to establish a finite element model of single crystal silicon under composite pulse laser irradiation. Numerical simulation using simulation software, Analyze the stress field distribution generated during the action of single-crystal silicon material under the action of single-pulse laser and composite high-energy pulsed laser. Finally, the stress field distribution law under the irradiation of the composite high-energy pulsed laser is obtained, and when the pulsed laser acts on the target material, the stress field distribution range becomes larger, and the pressure value also increases, and the silicon material is more easily damaged. In order to solve the problem that the distribution of stress field affects the processing effect of monocrystalline silicon in the process of laser processing silicon.
本文采用数值理论计算和实验模拟相结合的方法。研究和分析了1064nm和532nm复合脉冲激光与单晶硅相互作用下的应力场特性。基于傅立叶热传导方程,建立了复合脉冲激光辐照下单晶硅的有限元模型。利用仿真软件进行数值模拟,分析单晶硅材料在单脉冲激光和复合高能脉冲激光作用下产生的应力场分布。最后,得到了复合高能脉冲激光照射下的应力场分布规律,当脉冲激光作用于目标材料时,应力场分布范围变大,压力值也随之增大,硅材料更容易受到损伤。为了解决激光加工单晶硅过程中应力场分布影响单晶硅加工效果的问题。
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引用次数: 0
Simultaneous thermal infrared camouflage and laser scattering with thermal management based on an ultra-thin metasurface 基于超薄超表面的热红外伪装和激光散射同时热管理
Xingdong Feng, Fei Zhang, M. Pu, Yinghui Guo, Ping Gao, Xiangang Luo
In this paper, we propose an ultra-thin metasurface to achieve simultaneous thermal infrared camouflage and 1.06 μm laser scattering with thermal management. First, the metasurface has an average absorptivity/emissivity of 0.04 in the band of 8~14 μm and a emission peak at 5.62 μm with nearly 100% emissivity. Therefore, camouflage against thermal infrared detectors and effective thermal management can be achieved. Second, the chessboard-like square patches on the top of the meatsurface make it possible to reduce the specular reflection at the laser wavelength of 1.06 μm to less than 2% by redirecting the reflected light to non-normal angles. These excellent simulated results indicate that our proposed metasurface has promising applications in the fields of multi-band infrared camouflage.
在本文中,我们提出了一种超薄超表面,同时实现热红外伪装和1.06 μm激光散射和热管理。首先,该超表面在8~14 μm波段的平均吸收率/发射率为0.04,在5.62 μm波段有一个发射峰,发射率接近100%。因此,可以实现对热红外探测器的伪装和有效的热管理。其次,肉面顶部的棋盘状方形斑块通过将反射光重新定向到非法线角度,使激光波长1.06 μm处的镜面反射光减少到2%以下。这些优异的仿真结果表明我们所提出的超表面在多波段红外伪装领域具有广阔的应用前景。
{"title":"Simultaneous thermal infrared camouflage and laser scattering with thermal management based on an ultra-thin metasurface","authors":"Xingdong Feng, Fei Zhang, M. Pu, Yinghui Guo, Ping Gao, Xiangang Luo","doi":"10.1117/12.2604483","DOIUrl":"https://doi.org/10.1117/12.2604483","url":null,"abstract":"In this paper, we propose an ultra-thin metasurface to achieve simultaneous thermal infrared camouflage and 1.06 μm laser scattering with thermal management. First, the metasurface has an average absorptivity/emissivity of 0.04 in the band of 8~14 μm and a emission peak at 5.62 μm with nearly 100% emissivity. Therefore, camouflage against thermal infrared detectors and effective thermal management can be achieved. Second, the chessboard-like square patches on the top of the meatsurface make it possible to reduce the specular reflection at the laser wavelength of 1.06 μm to less than 2% by redirecting the reflected light to non-normal angles. These excellent simulated results indicate that our proposed metasurface has promising applications in the fields of multi-band infrared camouflage.","PeriodicalId":236529,"journal":{"name":"International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130817043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Interested region selection and super-resolution reconstruction of depth image for scanning lidar 扫描激光雷达感兴趣区域选择与深度图像超分辨率重建
Ao Yang, Jie Cao, Zhijun Li, Yang Cheng, Q. Hao
Scanning lidar scans the target region point-by-point and measures the time of flight (TOF) of laser signal at each point to obtain the 3D information of the target surface. By using fixed size of scanning spot, the resolution of reconstructed depth image is consistent with the number of scanning points. Therefore, traditional scanning lidar is hardly to achieve high resolution and scanning efficiency simultaneously. Aimed to address this issue, we propose a method of interested region selection and depth image super-resolution reconstruction. By constructing a simulation target region with 10 m × 10 m, the proposed method is used to scan this region. The position of the interested region is obtained by scanning the full field of view (FOV) with a large spot. Then the interested region with 4 m × 8 m is fine scanned with reduced scanning spot. By using the super-resolution reconstruction method of depth image, the resolution of the depth image obtained by fine scanning with 40 × 80 points is increased by two times. And the depth image of the interested region with 80 × 160 pixels is obtained. The simulation result shows that the lidar based on this method can give consideration to both high scanning efficiency and the resolution of reconstructed depth image.
扫描激光雷达逐点扫描目标区域,测量每个点处激光信号的飞行时间(TOF),获得目标表面的三维信息。通过使用固定尺寸的扫描点,重建深度图像的分辨率与扫描点的数量一致。因此,传统的扫描激光雷达很难同时实现高分辨率和高扫描效率。针对这一问题,提出了一种兴趣区域选择和深度图像超分辨率重建方法。通过构造一个10 m × 10 m的仿真目标区域,采用该方法对该区域进行扫描。通过大点扫描全视场获得感兴趣区域的位置。然后对4 m × 8 m的感兴趣区域进行精细扫描,缩小扫描点。采用深度图像的超分辨率重建方法,将40 × 80点精细扫描得到的深度图像分辨率提高了2倍。得到感兴趣区域80 × 160像素的深度图像。仿真结果表明,基于该方法的激光雷达能够兼顾高扫描效率和重建深度图像的分辨率。
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引用次数: 0
Design of the active cooling focal plane component for the space astronomy telescope 空间天文望远镜主动冷却焦平面元件的设计
Liang-jie Feng, Chenjie Wang, Gangyi Zou
The detecting CCD of a space astronomical telescope needs to be cooled to -75℃ to suppress the dark current for faint target detecting in the universe, and coplanarly spliced with two fine guidance sensor(FGS) which needs to be cooled to -40°C for the stability as long time observation. Two one stage thermos-electric cooler(TEC) was connected to actively cool the detector to ensure the working temperature and the temperature control accuracy, the Structural of the actively cooling detector assembly and the focal plane component were presented and the power dissipation of the TEC was calculated. In order to ensure the coplanarity of the focal plane component on the working temperature, the finite element method was used to analyze the thermal distribution on the detector surface and the thermal deformation of the supporting structure of the FGS with different materials. The analysis results showed that the lowest cooling temperature of the detecting CCD is -75°C, the temperature control accuracy was better than 1°C, and the coplanar error of the detection CCD and the fine guidance sensors did not exceed 20μm. The thermal equilibrium test showed that the lowest cooling temperature was -74.9°C~-75.1°C for the detecting CCD, The temperature control accuracy was 0.1°C. The thermal optical test showed that the defocus of the FGS was 4μm after focusing, which verified the thermal and structural design performance of the focal plane component.
空间天文望远镜的探测CCD需要冷却到-75℃以抑制宇宙中微弱目标的暗电流,并与两个需要冷却到-40℃的精细制导传感器(FGS)共面拼接以保证长时间观测的稳定性。为保证探测器的工作温度和控温精度,采用两个一级热电冷却器(TEC)对探测器进行主动冷却,给出了主动冷却探测器组件和焦平面组件的结构,并对TEC的功耗进行了计算。为了保证焦平面组件在工作温度下的共平面性,采用有限元法分析了不同材料的FGS探测器表面的热分布和支撑结构的热变形。分析结果表明,检测CCD的最低冷却温度为-75℃,控温精度优于1℃,检测CCD与精密制导传感器的共面误差不超过20μm。热平衡测试表明,检测CCD的最低冷却温度为-74.9℃~-75.1℃,控温精度为0.1℃。热光学测试表明,聚焦后FGS的离焦距离为4μm,验证了焦平面组件的热性能和结构设计性能。
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引用次数: 0
Interference pattern with an analytical solution in modified Shack-Hartmann sensor 改进Shack-Hartmann传感器干涉图样的解析解
Xiaoyang Li, Xu Yang, Bincheng Li, Shengqian Wang, H. Xian
Segmented telescope is an effective way to realize high-resolution observations in astronomy. An important work for high-resolution observations using segmented telescopes is phasing the segmented primary mirror. Modified Shack-Hartmann sensor. Is proposed for piston error detection. The interference pattern created by a circular lens placed across two adjacent mirrors in exit pupil plane is used as the signal of the modified Shack-Hartmann sensor. Piston errors need to be extracted from the interference pattern. The offset of lens and gap error of adjacent mirrors causes the distortion of interference pattern, and leads to a reduction in the detection accuracy of existing piston error extraction techniques. In this paper, we propose to replace the circular lens with a square lens and the mathematical model of the corresponding interference pattern is modeled by Fourier optics, including the one-dimensional and two-dimensional analytical solution of the interference pattern. The simulation results show that the proposed analytical solution can effectively characterize the interference pattern in the ideal situation and in the presence of lateral offset of the lens and the gap error of the adjacent mirrors situation. The results presented here give a deeper insight into the interference pattern of modified Shack-Hartmann sensor, and are of great help for developing new piston error detection techniques based on modified Shack-Hartmann sensor.
在天文学中,分段望远镜是实现高分辨率观测的有效途径。利用分段望远镜进行高分辨率观测的一项重要工作是对分段主镜进行相位调整。改进的Shack-Hartmann传感器。提出了活塞误差检测方法。在出瞳平面上放置一个圆透镜,穿过两个相邻的反射镜所产生的干涉图样被用作改进的沙克-哈特曼传感器的信号。活塞误差需要从干涉图样中提取出来。透镜的偏移和相邻反射镜的间隙误差导致干涉图畸变,降低了现有活塞误差提取技术的检测精度。本文提出用方形透镜代替圆形透镜,并利用傅里叶光学建立相应干涉图样的数学模型,包括干涉图样的一维解析解和二维解析解。仿真结果表明,在理想情况下以及存在透镜侧偏和相邻镜间隙误差的情况下,所提出的解析解能够有效地表征干涉图样。本文的研究结果对改进的Shack-Hartmann传感器的干涉规律有了更深入的了解,对基于改进的Shack-Hartmann传感器的活塞误差检测新技术的开发有很大的帮助。
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引用次数: 0
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International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT)
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