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Spectral reflectance fitting based on land-based hyperspectral imaging and semi-empirical kernel-driven model for typical camouflage materials 基于陆基高光谱成像和典型伪装材料的半经验核驱动模型的光谱反射率拟合
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-12-08 DOI: 10.1051/jeos/2023045
Jiale Zhao
Abstract: The reflectance of an object is a physical quantity that is related to a variety of factors such as wavelength, direction of light source, direction of detection, and weather conditions.If complete spectral information about the target is to be obtained, this can only be done by measuring the spectral reflectance in all angular directions. Obviously, this method of acquiring spectral data has the disadvantages of complex operation, low efficiency and poor timeliness in military applications. The Semi-Empirical kernel-driven model captures the main factors affecting the bidirectional reflective properties of an object and uses physically meaningful kernel parameters to characterise the reflective properties of an object. By measuring these kernel parameters and combining them with a small number of measurements, it is possible to extrapolate and fit the spectral reflectance of the target in all directions, improving the efficiency of information acquisition and processing. Semi-empirical kernel-driven models were initially used to study the composition and structure of vegetation and its spectral reflectance properties with some results. However, whether the Semi-empirical kernel-driven model can be effectively used to study the spectral reflectance properties of military materials has not been verified. This paper first introduces three commonly used semi-empirical kernel-driven models, namely RossThick-LiSparseR(RTLSR), RossThick-LiTransitN (RTLT) and RossThick-Roujean (RTR). Then, the spectral reflectance of four typical military materials was measured using an imaging spectrometer, and the fitting effects of different models were evaluated. Experiments show that the three semi-empirical kernel-driven models have good data fitting ability for different types of military materials.Overall, RTLSR model has the best data fitting ability and the best stability of inversion results.
摘要:物体的反射率是一个物理量,它与波长、光源方向、探测方向、天气条件等多种因素有关。如果要获得目标的完整光谱信息,只能通过测量各个角度方向的光谱反射率来实现。显然,这种获取光谱数据的方法在军事应用中存在操作复杂、效率低、时效性差的缺点。半经验核驱动模型捕获影响对象双向反射特性的主要因素,并使用物理上有意义的核参数来表征对象的反射特性。通过测量这些核心参数,并将其与少量测量相结合,可以外推和拟合目标各方向的光谱反射率,提高信息获取和处理的效率。利用半经验核驱动模型对植被的组成、结构及其光谱反射率特性进行了初步研究,并取得了一些成果。然而,半经验核驱动模型能否有效地用于研究军用材料的光谱反射率特性,尚未得到验证。本文首先介绍了三种常用的半经验核驱动模型,即rosssthick - lisparser (RTLSR)、rosssthick - litransitn (RTLT)和rosssthick - roujean (RTR)。然后,利用成像光谱仪测量了4种典型军用材料的光谱反射率,并对不同模型的拟合效果进行了评价。实验表明,这三种半经验核驱动模型对不同类型的军用材料具有良好的数据拟合能力。总体而言,RTLSR模型具有最佳的数据拟合能力和最佳的反演结果稳定性。
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引用次数: 0
Quantum coherence and entanglement of the system of a five−level atom in the presence of nonlinear fields 存在非线性场时五级原子系统的量子相干性和纠缠性
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-11-29 DOI: 10.1051/jeos/2023044
Sayed Abdel-Khaled
We investigate the atom−field system in the framework of harmonic oscillators based on deformed Heisenberg algebras. We explore the dynamic characteristics of the considered system under the effect of a nonlinear field. In particular, we consider the atomic population, atomic coherence, and atom−field entanglement for a system that comprises a single five−level atom interacting with a single−mode nonlinear field when the deformation effect is taken into account. We examine the time evolution of the quantum quantifiers in the presence of deformation when the initial state of the quantized field is defined to be a nonlinear coherent state (CS) or a superposition state
我们在基于变形海森堡代数的谐振子框架内研究了原子-场系统。我们探讨了所考虑的系统在非线性场作用下的动态特性。特别是,当变形效应被考虑在内时,我们考虑了由单个五级原子与单模非线性场相互作用的系统的原子群、原子相干性和原子-场纠缠。当量子化场的初始状态被定义为非线性相干态(CS)或叠加态时,我们考察了量子量子的时间演化。
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引用次数: 0
Implementation of FORMIDABLE: a generalized differential optical design library with NURBS capabilities 实现 FORMIDABLE:具有 NURBS 功能的通用差分光学设计库
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-11-24 DOI: 10.1051/jeos/2023043
J. Volatier
In this article we describe the implementation of FORMIDABLE: an optical design library capable of simulating optical systems by ray-tracing. Optical performance can be quantified and optimised using third-party optimisation algorithms. Compared to available commercial optical design software and similarly to FANO, our code can simulate and optimise non-uniform rational B-splines surfaces. It also implements generalized differential capabilities that allows faster convergence compared to state-of-the-art. The implementation of FORMIDABLE and its innovative capabilities are described and illustrated with a representative case-study. The source code is available to eligible third-parties under the ECSL licence.
在这篇文章中,我们介绍了 FORMIDABLE 的实现:这是一个光学设计库,能够通过光线跟踪模拟光学系统。光学性能可通过第三方优化算法进行量化和优化。与现有的商业光学设计软件相比,与 FANO 相似,我们的代码可以模拟和优化非均匀有理 B 样条曲面。它还实现了广义差分功能,与最先进的软件相比,收敛速度更快。我们将通过一个具有代表性的案例研究来描述和说明 FORMIDABLE 的实现过程及其创新能力。在 ECSL 许可下,符合条件的第三方可以使用源代码。
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引用次数: 0
Optical system design method of the all-day starlight refraction navigation system 全天星光折射导航系统光学系统设计方法
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-10-27 DOI: 10.1051/jeos/2023041
shaochong wu
The application of starlight refraction navigation to spacecraft and space weapons is a significant development direction. Observing enough refracted stars for the star sensor in a strong limb background is an urgent problem. The all-day optical system parameters are analyzed based on the star detection requirement and navigation accuracy. Combined with primary aberration theory, the prime-focus catadioptric optical system is selected to meet the design requirements of a wide field of view (FOV) and tight structure. An H-band (1.52um-1.78um) star sensor is designed with a FOV of 6°, a focal length of 831mm, an effective aperture of 253mm, and a relative distortion of 0.03%. The energy concentration of the star point is 85% within 30um, and the maximum lateral chromatic aberration is 2.9um, which meets the imaging requirements. Furthermore, a baffle is designed to avoid the influence of direct sunlight on stellar imaging. The proposed method can provide a theoretical foundation and technical support for the optical design of the refraction star navigation.
星光折射导航在航天器和空间武器中的应用是一个重要的发展方向。星敏感器在强翼背景下观测到足够多的折射星是一个迫切需要解决的问题。根据星探测要求和导航精度,对全天光学系统参数进行了分析。结合初像差理论,选择了初焦反射光学系统,满足了大视场和紧凑结构的设计要求。设计了一种h波段(1.52um-1.78um)星敏感器,视场为6°,焦距为831mm,有效孔径为253mm,相对畸变为0.03%。星点在30um内的能量浓度为85%,最大横向色差为2.9um,满足成像要求。此外,还设计了一个挡板,以避免阳光直射对恒星成像的影响。该方法可为折射星导航的光学设计提供理论基础和技术支持。
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引用次数: 0
Research on highly dynamic 3D measurement method based on RGB color fringe projection 基于RGB彩色条纹投影的高动态三维测量方法研究
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-10-09 DOI: 10.1051/jeos/2023040
Fu Ling
Metal parts with highly dynamic areas often appear in industrial production measurements. However, if the traditional fringe projection technique is used to project fringe onto the surface of these metal parts, the light energy will be excessively concentrated and the image will be saturated, resulting thus in the loss of fringe information. To effectively address the high reflectivity problem of the object under test in fringe projection, background normalized Fourier transform contouring was combined with adaptive fringe projection in this work and a new method for performing highly dynamic 3D measurements was proposed. To reduce the number of the acquired images by the camera, a monochromatic fringe of different frequencies was put into the RGB channel to make color composite fringe, and then a color camera was used to acquire the deformed color composite fringe map. The images acquired by the color camera were then separated into three channels to obtain three deformed stripe maps. The crosstalk was also removed from these three images, and the 3D shape of the object was reconstructed by carrying out Fourier transform contouring with background normalization. From our experiments, it was demonstrated that the root mean square error of the proposed method can reach 0.191 mm, whereas, unlike the traditional methods, the developed method requires four images.
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引用次数: 0
Chirped gap solitons with Kudryashov’s law of self-phase modulation having dispersive reflectivity 具有色散反射率的库德里亚绍夫自相位调制定律的啁啾隙孤子
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-09-29 DOI: 10.1051/jeos/2023038
Khalil Al-Ghafri
The present study is devoted to investigate the chirped gap solitons with Kudryashov’s law of self-phase modulation having dispersive reflectivity. Thus, the mathematical model consists of coupled nonlinear Schrödinger equation (NLSE) that describes pulse propagation in a medium of fiber Bragg gratings (BGs). To reach an integrable form for this intricate model, the phase-matching condition is applied to derive equivalent equations that are handled analytically. By means of auxiliary equation method which possesses Jacobi elliptic function (JEF) solutions, various forms of soliton solutions are extracted when the modulus of JEF approaches 1. The generated chirped gap solitons have different types of structures such as bright, dark, singular, W-shaped, kink, anti-kink and Kink-dark solitons. Further to this, two soliton waves namely chirped bright quasi-soliton and chirped dark quasi-soliton are also created. The dynamic behaviors of chirped gap solitons are illustrated in addition to their corresponding chirp. It is noticed that self-phase modulation and dispersive reflectivity have remarkable influences on the pulse propagation. These detailed results may enhance the engineering applications related to the field of fiber BGs.
本文研究了具有色散反射率的具有库德里亚绍夫自相位调制定律的啁啾隙孤子。因此,数学模型由耦合非线性Schrödinger方程(NLSE)组成,该方程描述了脉冲在光纤布拉格光栅(BGs)介质中的传播。为了得到这个复杂模型的可积形式,采用相位匹配条件推导出解析处理的等价方程。利用具有Jacobi椭圆函数(JEF)解的辅助方程方法,在JEF的模量接近1时提取出各种形式的孤子解。生成的啁啾隙孤子具有亮孤子、暗孤子、奇异孤子、w形孤子、扭结孤子、反扭结孤子和扭结-暗孤子等不同类型的结构。在此基础上,还产生了啁啾亮准孤子和啁啾暗准孤子两个孤子波。讨论了啁啾间隙孤子的动力学行为及其相应的啁啾。注意到自相位调制和色散反射率对脉冲的传播有显著的影响。这些详细的研究结果将有助于光纤光纤光栅领域的工程应用。
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引用次数: 0
Atom–field system: Effects of squeezing and inten-sity dependent coupling on the quantum coherence and nonclassical properties 原子场系统:压缩和强度相关耦合对量子相干性和非经典性质的影响
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-09-21 DOI: 10.1051/jeos/2023039
Kamal Berrada
Recently, Kumar Gerry et al. [Phys. Rev. A 90, 033427 (2014)] studied the coherence control in a six-level atom through solving the Schrödinger equation in the field-interaction representation. In this manuscript, we investigate the interaction between a six-level atomic system (SLAS) and a single-mode field initially prepared in a squeezed coherent state. We extend the Jeans-Cummings model to describe the interaction between the atom and the squeezed field (SF) and the system dynamics. We examine the time evolution of the atomic coherence, non-local correlation, statistical properties within the bipartite system in the presence and absence intensity-dependent coupling (I-DC) for different squeezing regimes of the field.
最近,Kumar Gerry等人。通过求解场相互作用表示中的Schrödinger方程,研究了六能级原子的相干性控制[j] .光子学报(自然科学版),2014,31(4):444 - 444。在本文中,我们研究了六能级原子系统(SLAS)与最初在压缩相干态中制备的单模场之间的相互作用。我们扩展了jean - cummings模型来描述原子与压缩场(SF)之间的相互作用和系统动力学。我们研究了在存在和不存在强度相关耦合(I-DC)的情况下,在不同的场压缩制度下,二部系统内原子相干性,非局部相关性,统计性质的时间演化。
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引用次数: 0
Determination of scattering coefficient and scattering anisotropy factor of tissue-mimicking phantoms using line-field confocal optical coherence tomography (LC-OCT) 利用线场共聚焦光学相干断层扫描(LC-OCT)测定模拟组织模型的散射系数和散射各向异性因子
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-08-31 DOI: 10.1051/jeos/2023037
L. Waszczuk
Line-field confocal optical coherence tomography (LC-OCT) is an imaging modality based on a combination of time-domain optical coherence tomography and reflectance confocal microscopy. LC-OCT provides three-dimensional images of semi-transparent samples with a spatial resolution of ∼ 1 μm. The technique is primarily applied to in vivo skin imaging. The image contrast in LC-OCT arises from the backscattering of incident light by the sample microstructures, which is determined by the optical scattering properties of the sample, characterized by the scattering coefficient μs and the scattering anisotropy factor g. In biological tissues, the scattering properties are determined by the organization, structure and refractive indexes of the sample. The measurement of these properties using LC-OCT would therefore allow a quantitative characterization of tissues in vivo. We present a method for extracting the two scattering properties μs and g of tissue-mimicking phantoms from 3D LC-OCT images. The method provides the mean values of μs and g over a lateral field of view of 1.2 mm × 0.5 mm (x × y). It can be applied to monolayered and bilayered samples, where it allows extraction of μs and g of each layer. Our approach is based on a calibration using a phantom with known optical scattering properties and on the application of a theoretical model to the intensity depth profiles acquired by LC-OCT. It was experimentally tested against integrating spheres and collimated transmission measurements for a set of monolayered and bilayered scattering phantoms.
线场共焦光学相干断层扫描(LC-OCT)是一种基于时域光学相干断层成像和反射共焦显微镜相结合的成像模式。LC-OCT提供半透明样品的三维图像,空间分辨率为~1μm。该技术主要应用于体内皮肤成像。LC-OCT中的图像对比度源于样品微观结构对入射光的后向散射,这由样品的光学散射特性决定,以散射系数μs和散射各向异性因子g为特征。在生物组织中,散射特性由组织决定,样品的结构和折射率。因此,使用LC-OCT测量这些特性将允许对体内组织进行定量表征。我们提出了一种从3D LC-OCT图像中提取组织模拟体模的两种散射特性μs和g的方法。该方法提供了1.2 mm×0.5 mm(x×y)横向视场上μs和g的平均值。它可以应用于单层和双层样品,可以提取每层的μs和g。我们的方法基于使用具有已知光学散射特性的体模进行校准,并将理论模型应用于LC-OCT获得的强度-深度剖面。它针对一组单层和双层散射体模的积分球和准直透射测量进行了实验测试。
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引用次数: 0
Exploring the Photonic Spectrum of Plasma Superlattice with Magnetic Fields 利用磁场探索等离子体超晶格的光子谱
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-08-04 DOI: 10.1051/jeos/2023036
Servando Lopez Aguayo
In this study, we investigate how an external magnetic field that can have anydirection affects a superlattice’s photonic band structure, composed of alternating dielectric andplasma layers. By deriving the dispersion equations, we show that the photonic spectrum of thesuperlattice loses its degeneracy and splits into two branches due to the external magnetic field.Moreover, our findings reveal a direction-independent transition from a photonic insulator toa photonic conductor. Interestingly, our results indicate that a superlattice that was previouslycompletely photo-isolating can become entirely photo-conducting, regardless of the direction ofthe external magnetic field.
在这项研究中,我们研究了一个可以有任何方向的外部磁场如何影响由交替介电层和等离子体层组成的超晶格的光子带结构。通过推导色散方程,我们证明了由于外加磁场的作用,超晶格的光子谱失去简并并分裂成两个分支。此外,我们的发现揭示了从光子绝缘体到光子导体的方向无关的转变。有趣的是,我们的研究结果表明,以前完全光隔离的超晶格可以变得完全光导电,而与外部磁场的方向无关。
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引用次数: 0
DYNAMICAL SYSTEM OF OPTICAL SOLITON PARAMETERS BY VARIATIONAL PRINCIPLE (SUPER--GAUSSIAN AND SUPER--SECH PULSES) 基于变分原理的光孤子参数动力学系统(超高斯和超秒脉冲)
IF 1.5 4区 物理与天体物理 Q3 Physics and Astronomy Pub Date : 2023-07-07 DOI: 10.1051/jeos/2023035
L. Moraru
The parameter dynamics of super-sech and super-Gaussian pulses for the perturbed nonlinear Schrödinger's equation with power-law nonlinearity is obtained in this article. The variational principle successfully recovers this dynamical system. The details of the variational principle with the implementation of the Euler--Lagrange's equation to the nonlinear Schrödinger's equation with power--law of nonlinearity described in this paper have not been previously reported.
本文得到了幂律非线性摄动非线性薛定谔方程的超秒脉冲和超高斯脉冲的参数动力学。变分原理成功地恢复了这个动力系统。本文所描述的将欧拉-拉格朗日方程转化为非线性幂次薛定谔方程的变分原理的细节——非线性定律,以前没有报道过。
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引用次数: 0
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Journal of the European Optical Society-Rapid Publications
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