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Laser circular-viewing azimuth measurement based on detector spot position 基于探测器光斑位置的激光环视方位角测量
Pub Date : 2023-12-18 DOI: 10.1117/12.2692252
Qingfeng Kong, Zhen Sun, Jie Ma, Zuntian Chen, Yanzheng Fan, Pengfei Hu
Laser fuze usually adopt an active detection method, which emits laser pulses to the target through the transmitting system. After scattering by the target, the receiving system obtains the return laser signal. By calculating the time delay between the transmitting pulse and the receiving pulse, the target distance can be calculated. Traditional circular-viewing laser fuze typically use four zones for 360 degree detection, with a detection field angle accuracy of only 90 degrees. In order to achieve accurate measurement of target azimuth angle by laser fuze, this paper proposes a method based on the position of laser spot on a photodetector to calculate the target azimuth angle. The effects of proposed method are analyzed by simulation experiment. The results demonstrate that this method can accurately detect the target azimuth angle.
激光引信通常采用主动探测方式,通过发射系统向目标发射激光脉冲。经过目标散射后,接收系统获得返回的激光信号。通过计算发射脉冲和接收脉冲之间的时间延迟,可以计算出目标距离。传统的圆视角激光引信通常使用四个区域进行 360 度探测,探测场角精度仅为 90 度。为了实现激光引信对目标方位角的精确测量,本文提出了一种基于激光光斑在光电探测器上的位置来计算目标方位角的方法。本文通过模拟实验分析了所提方法的效果。结果表明,这种方法可以准确探测目标方位角。
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引用次数: 0
Developing a polarization-insensitive conformal near-IR carpet cloak with broadband capability to suppress lateral shift 开发具有宽带抑制侧移能力的偏振不敏感保形近红外地毯斗篷
Pub Date : 2023-12-18 DOI: 10.1117/12.3005738
Yao Huang, Qiran Chen
In recent years, there has been a surge of interest in the development of invisibility cloaks that can manipulate electromagnetic waves. This trend stems from the rapid growth of transformation optics and metamaterials technology, which offers exciting opportunities for controlling light propagation across a broad range of frequencies. One particular type of invisibility cloak that has gained significant attention is the carpet cloak. However, previous implementations of carpet cloaks have encountered limitations that hinder their performance in certain contexts. For example, quasi-conformal mapping carpet cloaks are known to produce a lateral shift in the reflected light ray, leading to undesirable effects in imaging applications. Similarly, birefringent carpet cloaks exhibit polarization dependence, which poses major challenges in situations where polarization may vary. To address these drawbacks, we propose a novel approach using an isotropic non-resonant medium and a judiciously designed conformal mapping to develop a carpet cloak. This design approach overcomes previous limitations by enabling the realization of an invisibility cloak for near-IR. Analytical calculations and numerical simulations are conducted to confirm the polarization-robust performance of this near-IR design, which offers superior performance over prior designs. Furthermore, a microwave carpet cloak design are proposed and verified to prove the universality of this approach. By developing this new approach, we hope to contribute to the advancement of cloaking technology and foster its practical applications in various fields.
近年来,人们对开发能够操纵电磁波的隐形斗篷兴趣高涨。这一趋势源于变换光学和超材料技术的快速发展,它为控制光在广泛频率范围内的传播提供了令人兴奋的机会。地毯隐形衣是备受关注的一种特殊隐形衣。然而,地毯隐形衣以前的实现遇到了一些限制,妨碍了其在某些情况下的性能。例如,众所周知,准共形映射地毯隐形衣会在反射光线中产生横向偏移,从而在成像应用中产生不良影响。同样,双折射地毯斗篷也表现出偏振依赖性,这给偏振可能变化的情况带来了重大挑战。为了解决这些问题,我们提出了一种新方法,利用各向同性的非共振介质和精心设计的共形映射来开发地毯斗篷。这种设计方法克服了以往的局限性,实现了近红外隐形斗篷。分析计算和数值模拟证实了这种近红外设计的极化稳健性能,其性能优于先前的设计。此外,我们还提出并验证了一种微波地毯式隐形衣设计,以证明这种方法的普遍性。我们希望通过开发这种新方法,为隐形技术的进步做出贡献,并促进其在各个领域的实际应用。
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引用次数: 0
Design and implementation of a new Dewar structure for large-scale and high performance infrared focal plane 设计并实现用于大规模和高性能红外焦平面的新型杜瓦结构
Pub Date : 2023-12-18 DOI: 10.1117/12.3008143
Guangquan Zhai, Bocong An, Yue Wang, Xueliang Hu, Jingyuan Li, Dawei Yang
With the development of space infrared focal plane detectors towards large-scale, multi spectral, and high integration directions, issues such as heat leakage, micro vibration, and structural thermal adaptation have become increasingly prominent, becoming bottlenecks that restrict the application of large-sized infrared focal plane detectors. By using a new Dewar with a string structure, the support problem of infrared focal plane components has been solved. Through the analysis and verification of force thermal coupling design, the new Dewar structure has effectively reduced heat leakage, Reduced the impact of micro vibrations and avoided detector stress caused by thermal adaptation, providing a solution for the application of high-performance large-sized infrared focal planes.
随着空间红外焦平面探测器向着大规模、多光谱、高集成度方向发展,热泄漏、微振动、结构热适应等问题日益突出,成为制约大型红外焦平面探测器应用的瓶颈。通过采用新型弦结构杜瓦,解决了红外焦平面元件的支撑问题。通过对力热耦合设计的分析和验证,新型杜瓦结构有效减少了热泄漏,降低了微振动的影响,避免了热适应引起的探测器应力,为高性能大型红外焦平面的应用提供了解决方案。
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引用次数: 0
Research on application of wireless transmission technology in in-space assembled telescope 太空组装望远镜中无线传输技术的应用研究
Pub Date : 2023-12-18 DOI: 10.1117/12.3006686
Yuyao Wang, Qiaolin Huang, Wei Jiang
The modular segmented space telescope can get rid of the limitation of the effective envelope of the fairing of the existing launch vehicle, meet the requirement of the large aperture of the space telescope, and play an important role in space exploration and earth observation. In order to solve the problem of power supply and signal transmission of the primary mirror of the segmented space telescope, a kind of modularization space telescope primary mirror system for in-space assembly is first proposed in this paper. Then, according to the index requirements and the assembly process of primary mirror, the wireless energy and signal transmission scheme and system structure are proposed. By analyzing the key parameters, the optimal system of wireless energy and signal transmission on the segmented mirror is achieved. The proposed system realizes high power and high efficiency transmission of power supply energy and reliable transmission of data signal during and after assembly of the segmented mirror, and solves wire connection problems caused by the traditional wired transmission mode.
模块化分段空间望远镜可以摆脱现有运载火箭整流罩有效包络的限制,满足空间望远镜大口径的要求,在空间探测和对地观测中发挥重要作用。为了解决分段式空间望远镜主镜的供电和信号传输问题,本文首先提出了一种用于空间组装的模块化空间望远镜主镜系统。然后,根据指标要求和主镜装配工艺,提出了无线能量和信号传输方案及系统结构。通过对关键参数的分析,实现了分段镜上无线能量和信号传输的最优系统。所提出的系统实现了分段镜装配过程中和装配后电源能量的高功率、高效率传输和数据信号的可靠传输,解决了传统有线传输方式带来的线缆连接问题。
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引用次数: 0
Quantitative analysis of coal industrial index based on data set partitioning method 基于数据集划分方法的煤炭工业指数定量分析
Pub Date : 2023-12-18 DOI: 10.1117/12.2692262
You-quan Dou, Qing-song Wang, Sen Wang, Xi Shu, Ming-hui Ni, Li-Xiao Shen, Yan Li
In order to further improve the accuracy of quantitative analysis of coal quality by laser induced breakdown spectroscopy (LIBS), the influence of data set partitioning method on quantitative model was studied. The spectral data of 40 different coal samples were collected, and the Support Vector Regression (SVR) model and random forest (RF) model were established by Random Selection (RS), Kennard-Stone (KS) and Sample Partitioning based on joint X-Y distances (SPXY), respectively. The prediction results of ash, volatile matter and calorific value under the two models were compared. The results show that the regression model established by SPXY method combined with RF algorithm has better fitting prediction performance. The predicted root mean square errors (RMSEP) of ash, volatile matter and calorific value are 1.8872, 1.4537 and 0.9020, respectively, and the mean relative errors (MRE) are 6.96%, 3.87% and 2.14%, respectively.
为进一步提高激光诱导击穿光谱法(LIBS)煤质定量分析的准确性,研究了数据集划分方法对定量模型的影响。收集了 40 个不同煤样的光谱数据,分别采用随机选择法(RS)、肯纳-斯通法(KS)和基于 X-Y 联合距离的样本划分法(SPXY)建立了支持向量回归(SVR)模型和随机森林(RF)模型。比较了两种模型对灰分、挥发物和热值的预测结果。结果表明,SPXY 法结合 RF 算法建立的回归模型具有更好的拟合预测性能。灰分、挥发物和热值的预测均方根误差(RMSEP)分别为 1.8872、1.4537 和 0.9020,平均相对误差(MRE)分别为 6.96%、3.87% 和 2.14%。
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引用次数: 0
Analysis of the current development status and future trends of on-orbit servicing technology globally 分析全球在轨服务技术的发展现状和未来趋势
Pub Date : 2023-12-18 DOI: 10.1117/12.3007815
Liying Liu
The rapid development of space technology has propelled space-based on-orbit servicing into a new and independent research domain. Fueled by advancements in modern aerospace technology, the application of on-orbit servicing and operations has experienced further expansion. This paper provides an overview of the current state of space-based onorbit servicing technology both domestically and internationally. Emphasis is placed on elucidating the existing and future on-orbit servicing technology development plans of Western countries, led by the United States, as well as the current status of on-orbit servicing technology development in China. Furthermore, an analysis of the prospective directions for the future development of on-orbit servicing technology is conducted.
空间技术的飞速发展推动天基在轨服务成为一个新的独立研究领域。在现代航空航天技术进步的推动下,在轨服务和运营的应用范围进一步扩大。本文概述了国内外天基在轨服务技术的现状。重点阐释了以美国为首的西方国家现有和未来的在轨服务技术发展计划,以及中国在轨服务技术的发展现状。此外,还分析了在轨服务技术未来发展的前瞻性方向。
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引用次数: 0
Dual wideband signal generation with different tuning mechanisms based on the same optoelectronic oscillator 基于同一光电振荡器的具有不同调谐机制的双通道宽带信号发生器
Pub Date : 2023-12-18 DOI: 10.1117/12.3006346
Yibei Wang, Xiaotong Liu, Siyue Zeng, Hong Chen, Yalan Wang, Xiaoniu Peng, Dangwei Wang, Anle Wang
A method of dual-broadband signal generation based on the same optoelectronic oscillator with different tuning mechanisms is proposed in this paper. The structure includes a compatible dual-passband microwave photonic filter based on stimulated Brillouin Scattering effect (SBS) and phase-shifted Bragg fiber (PS-FBG). By implementing the Fourier-domain mode-locked mechanism, the proposed optoelectronic oscillator can simultaneously generate signals in different frequency bands with adjustable center frequency and bandwidth. The effectiveness of the proposed method is verified by experiments. Oscillating signals with bandwidth of 600 MHz and center frequencies at 5 GHz and 6 GHz are generated.
本文提出了一种基于同一光电振荡器、具有不同调谐机制的双宽带信号生成方法。该结构包括一个基于受激布里渊散射效应(SBS)和相移布拉格光纤(PS-FBG)的兼容双通带微波光子滤波器。通过实施傅里叶域锁模机制,所提出的光电振荡器可同时产生不同频段的信号,且中心频率和带宽可调。实验验证了所提方法的有效性。产生的振荡信号带宽为 600 MHz,中心频率分别为 5 GHz 和 6 GHz。
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引用次数: 0
Micro-vibration analysis and verification of space camera based on integrated model 基于集成模型的空间相机微振动分析与验证
Pub Date : 2023-12-18 DOI: 10.1117/12.3007516
Ma Jun
As the requirements of space camera imaging for stability is increasing, on-orbit micro-vibration has become one of the important factors that may affect the imaging of space cameras. The motion forms of space camera caused by micro-vibration were classified, and the mechanisms by which various motions affected the imaging of space camera were analyzed. Considering the effect of optical surface elastic deformation on camera imaging, an integrated model for micro-vibration analysis of space camera was established and the analysis flow was proposed. The integrated analysis model of micro-vibration was applied to the micro-vibration analysis and design improvement of a certain type of space camera, and the analysis results were verified through satellite testing and on-orbit imaging. The verification results show that, the micro-vibration MTF of the space camera is greater than 0.993, and the maximum image motion between the homonymous pixels is less than 1.84 μ m, which meets the requirements of camera imaging.
随着空间相机成像对稳定性的要求越来越高,在轨微振动已成为可能影响空间相机成像的重要因素之一。本文对微振动引起的空间相机运动形式进行了分类,并分析了各种运动对空间相机成像的影响机理。考虑到光学表面弹性变形对相机成像的影响,建立了空间相机微振动综合分析模型,并提出了分析流程。将微振动综合分析模型应用于某型空间相机的微振动分析和设计改进,并通过卫星测试和在轨成像对分析结果进行了验证。验证结果表明,空间相机的微振动 MTF 大于 0.993,同名像素间的最大图像运动小于 1.84 μ m,满足相机成像要求。
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引用次数: 0
Measurement method of optical axis parallelism of continuous zoom camera based on skeleton thinning algorithm 基于骨架减薄算法的连续变焦摄像机光轴平行度测量方法
Pub Date : 2023-12-18 DOI: 10.1117/12.2692305
Fanzi Kong, Huawei Wang, Yao Fang, Chanchan Kang, Feng Zhou
Optical axis parallelism is critical to high-quality clear imaging and stable field switching during zooming. In this paper, we propose a fast measurement method of optical axis parallelism based on collimator and image processing technology. Our method improves the measurement accuracy by introducing skeleton thinning algorithm. The method realizes the automatic measurement of the optical axis parallelism during zooming and reduces subjective errors. The experimental results show that the measurement efficiency and accuracy have been improved, confirming the practical value of the method.
光轴平行度对于高质量清晰成像和变焦时稳定的场切换至关重要。本文提出了一种基于准直仪和图像处理技术的光轴平行度快速测量方法。我们的方法通过引入骨架减薄算法提高了测量精度。该方法实现了变焦过程中光轴平行度的自动测量,减少了主观误差。实验结果表明,测量效率和精度都得到了提高,证实了该方法的实用价值。
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引用次数: 0
Mineral information recognition based on simulated high spatial resolution full spectrum remote sensing images 基于模拟高空间分辨率全光谱遥感图像的矿物信息识别
Pub Date : 2023-12-18 DOI: 10.1117/12.3000827
Na Li, Xinfeng Dong, Fuping Gan, Tongtong Li, Ruoheng Gao, Wei Bai
Minerals are natural compounds with certain chemical composition, which have stable phase interfaces and crystallization habits, and are of great significance for inversion of diagenetic and metallogenic geochemical characteristics and exploration. The use of remote sensing information to identify mineral types has achieved significant application results in the field of geology and mineral resources. In this paper, CASI-SASI-TASI airborne hyperspectral data and USGS standard spectrum library are used to establish a remote sensing image simulation method based on the combination of statistical model and Gaussian function, and the full spectrum remote sensing image with a spectral range of 425nm~12050nm and a spatial resolution of 2.25m is simulated. The simulated full spectral data were used to identify and extract 8 mineral information of limonite, hornblende, calcite/dolomite, high alumina sericite, medium alumina sericite, low alumina sericite, chlorite/epidote and quartz in Liuyuan area, Gansu Province, compared with the recognition results of airborne hyperspectral data, it was found that the two have strong consistency, this indicates that the simulated full spectrum remote sensing data in this article has strong practicality in identifying typical mineral information, and can provide important reference for the future development of spaceborne full spectrum high-resolution sensors and common key technologies.
矿物是具有一定化学成分的天然化合物,具有稳定的相界面和结晶习性,对反演成岩、成矿地球化学特征和勘探具有重要意义。利用遥感信息识别矿物类型在地质和矿产资源领域取得了显著的应用成果。本文利用 CASI-SASI-TASI 机载高光谱数据和 USGS 标准光谱库,建立了基于统计模型和高斯函数相结合的遥感影像模拟方法,模拟了光谱范围 425nm~12050nm、空间分辨率 2.25m 的全光谱遥感影像。利用模拟的全光谱数据对甘肃省柳园地区的褐铁矿、角闪石、方解石/白云石、高铝绢云母、中铝绢云母、低铝绢云母、绿泥石/橄榄石和石英 8 种矿物信息进行了识别和提取,并与航空高光谱数据的识别结果进行了对比、这表明本文模拟的全光谱遥感数据在识别典型矿物信息方面具有很强的实用性,可为未来空载全光谱高分辨率传感器及共性关键技术的发展提供重要参考。
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引用次数: 0
期刊
Applied Optics and Photonics China
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