2024
2024
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Record 253 of
Title:Hyperspectral Image Reconstruction of SD-CASSI Based on Nonlocal Low-Rank Tensor Prior
Author Full Names:Yin, Xiaorui(2); Su, Lijuan(2); Chen, Xin(1); Liu, Hejian(2); Yan, Qiangqiang(2,3); Yuan, Yan(2)Source Title:IEEE Transactions on Geoscience and Remote SensingLanguage:EnglishDocument Type:Journal article (JA)Abstract:In single disperser coded aperture snapshot spectral imaging (SD-CASSI) systems, many methods have been developed to reconstruct hyperspectral images (HSIs) from compressed measurements. Among these, deep learning (DL)-based methods have stood out, relying on powerful DL networks. However, the solidified structure of DL-based methods limits their adaptability. Moreover, they are often based on a model that neglects the dispersion process and instead emphasizes the encoding-compression process. Furthermore, research on optimization-based methods designed especially for SD-CASSI is lacking. In this article, we propose a comprehensive two-step projection imaging model for SD-CASSI that includes both spectral shearing projection and encoding-compression projection. Based on this model, we derive a tensor-based optimization framework that incorporates with the nonlocal low-rank tensor (NLRT) prior. In particular, NLRT extracts inherent spatial structural information from the measurements and employs it to guide the clustering of spatial-spectral similar HSI blocks. A CANDECOMP/PARAFAC (CP) low-rank regularizer is introduced to constrain the low-rank property of HSI block clusters. After that, we develop a solution framework based on the alternating direction method of multiplier (ADMM) approach. Comprehensive experiments demonstrate that our NLRT method outperforms state-of-the-art methods in terms of flexibility and performance. The source code and data of this article are publicly available at https://github.com/sdnjyxr/NLRT. ? 1980-2012 IEEE.Affiliations:(1) Beihang University, School of Mathematical Sciences, Beijing; 100191, China; (2) Beihang University, School of Instrumentation and Optoelectronics Engineering, Beijing; 100191, China; (3) Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, CAS Key Laboratory of Spectral Imaging Technology, Xi'an; 710119, ChinaPublication Year:2024Volume:62Start Page:1-15Article Number:5518015DOI Link:10.1109/TGRS.2024.3398299數(shù)據(jù)庫ID（收錄號(hào)）:20242016095987 -
Record 254 of
Title:Influences on the propagation of light beams by the near surface layer of atmosphere and the correction methods
Author Full Names:Yunqiang, Lai(1,2); Shangmin, Lin(1,2,3); Hu, Wang(1,2,3,4); Xuan, Zhang(1,3); Yu, Jin(1,2); Wenlong, He(1,2); Yaoke, Xue(1,2,3)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:6th Conference on Frontiers in Optical Imaging and Technology: Imaging Detection and Target RecognitionConference Date:October 22, 2023 - October 24, 2023Conference Location:Nanjing, ChinaConference Sponsor:The Chinese Society for Optical EngineeringAbstract:With the increasingly widespread and important application of optics in modern human life and production, research on the propagation characteristics and correction methods of light beams in the atmosphere near the ground surface is becoming increasingly important. The complex atmospheric environment near the ground can affect the propagation of light beams, causing effects such as energy attenuation, beam expansion, beam drift, intensity flicker, phase fluctuations, etc., reducing the quality of beam propagation and affecting the performance of optical applications in various fields. A review was conducted on the impact of near-Earth atmosphere on beam propagation and its correction methods, mainly elaborating on the effects of atmospheric absorption, scattering, and turbulence on beam propagation. Correction methods such as adaptive optics, large aperture receiving, spatial diversity, partially coherent light propagation, and image processing are proposed. ? 2024 SPIE. All rights reserved.Affiliations:(1) Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences(School of Optoelectronics), Beijing; 101408, China; (3) Xi’an Space Sensor Optical Technology Engineering Research Center, Xi'an; 710119, China; (4) Key Laboratory of Space Precision Measurement Technology, Chinese Academy of Sciences, Xi’an; 710119, ChinaPublication Year:2024Volume:13156Article Number:131561HDOI Link:10.1117/12.3019539數(shù)據(jù)庫ID（收錄號(hào)）:20242016093105 -
Record 255 of
Title:Influencing mechanisms of hot isostatic pressing on surface properties of additively manufactured AlSi10Mg alloy
Author Full Names:Sun, Lijun(1,2); Yang, Yulei(3); Li, Siyuan(2); Chen, Wencong(2); Wang, Yichun(2); Yan, Peng(2); Zhu, Yueqi(2); Wu, Weichao(1); Hu, Bingliang(2)Source Title:Journal of Materials Processing TechnologyLanguage:EnglishDocument Type:Journal article (JA)Abstract:Additively manufactured AlSi10Mg alloys have received considerable attention due to the prospectives in light-weight structural applications. Hot isostatic pressing (HIP) is widely utilized to minimize internal pores and enhance mechanical properties in terms of fatigue strength and ductility. Whereas the influence and mechanisms of HIP on surface properties, which is of crucial importance for aerospace optical components, remain to be further clarified. In the present study, systematic surface and subsurface analysis were conducted to unveil the underlying mechanisms of HIP on the surface qualities of an additively manufactured AlSi10Mg alloy. Three-dimensional white-light interfering profilometer, high-resolution X-ray micro computed tomography, X-ray diffraction, scanning electron microscope and transmission electron microscope were exploited to characterize the surface and subsurface alterations induced by HIP. The results demonstrate that, although remarkable reduction in the amount and size of internal pores can be achieved, sharp increase in the surface defects and roughness occurred for the precisely machined surface of the HIP treated alloy. Surface and subsurface analysis reveal that the deterioration in surface properties results from the establishment of micron Si particles and the reduction in nanohardness induced by HIP treatment. ? 2024 Elsevier B.V.Affiliations:(1) School of Mechatronical Engineering, Beijing Institute of Technology, Beijing; 100081, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing; 210094, ChinaPublication Year:2024Volume:329Article Number:118426DOI Link:10.1016/j.jmatprotec.2024.118426數(shù)據(jù)庫ID（收錄號(hào)）:20241916054071 -
Record 256 of
Title:Secure FSO communication based on optical frequency-hopping technology using delay interferometers
Author Full Names:Wang, Jian(1,2); Jin, Ya(1,2); Xie, Zhuang(3); Chen, Yinfang(1); Liu, Yu(1,2); Zhu, Ninghua(1,2)Source Title:Optics CommunicationsLanguage:EnglishDocument Type:Journal article (JA)Abstract:—A novel optical frequency-hopping (OFH) scheme using optical delay interferometers (DI) is proposed and demonstrated for secure transmission in free space. By performing carrier suppression modulation on the light wave emitted by the laser and connecting the phase modulator (PM) and DI in series, the conversion of the light wave modulated by the Mach-Zehnder modulator (MZM) from phase modulation to intensity modulation can be realized, and finally output the desired optical frequency-shift-keying (OFSK) carrier signal. Meanwhile, by controlling the positions of the frequencies of the positive and negative first-order sideband light waves on the DI frequency response curve, the OFSK signals output by the two ports of the DI can be complemented in the time domain. For the proposed OFH scheme, we carried out simulation experiments of 5 km free-space link transmission and back-to-back transmission with a communication rate of 10 Gbps, and the simulation results proved the feasibility of the scheme. Additionally, we also analyze the security performance of the proposed scheme and give the security space based on the eavesdropping probability. ? 2023 Elsevier B.V.Affiliations:(1) State Key Laboratory of Integrated Optoelectronics, Institute of Semiconductors, Chinese Academy of Sciences, Beijing; 100083, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, ChinaPublication Year:2024Volume:550Article Number:129939DOI Link:10.1016/j.optcom.2023.129939數(shù)據(jù)庫ID（收錄號(hào)）:20233914793103 -
Record 257 of
Title:Research on Moving Targets Detection and Tracking Satellite System
Author Full Names:Chang, Wujun(1); Jiang, Xiupeng(1); Gao, Enyu(1); Qin, Jing(2); Chen, Rongli(3); Su, Fan(1); Diao, Zhanlin(1); Gao, Shuai(1); Jia, Zhihui(1)Source Title:ACM International Conference Proceeding SeriesLanguage:EnglishDocument Type:Conference article (CA)Conference Title:3rd International Symposium on Control Engineering and Robotics, ISCER 2024Conference Date:May 24, 2024 - May 26, 2024Conference Location:Changsha, ChinaAbstract:For the problem of detection, stable tracking and positioning of moving targets in complex scene, an optical detection and tracking system for LEO dual-satellite formation is constructed, the continuous tracking observation performance of the dual-satellite system was analyzed, and a dual-satellite target positioning model was established. Hyperspectral, infrared and other optical detection means were used, combined with target detection and tracking algorithms, and the engineering design method of satellite key technologies were proposed and in-orbit application verification was carried out. The conclusion is that the technology in this paper can achieve effective detection and perception of wide-area moving targets, continuous real-time monitoring and rapid precise positioning. ? 2024 ACM.Affiliations:(1) Beijing Minospace Technology Co. Ltd., Beijing; 100094, China; (2) Xi'an Institute of Optics and Precision Mechanics CAS Aerospace Science and Technology Co. Ltd., Xi an; 710100, China; (3) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi an; 710119, ChinaPublication Year:2024Start Page:530-536DOI Link:10.1145/3679431.3679516數(shù)據(jù)庫ID（收錄號(hào)）:20243917085280 -
Record 258 of
Title:Dynamic multi-focus laser sculpting of freeform 3D glass microstructures
Author Full Names:Yao, Li(1); Xu, Kang(1); Huang, Lingyu(1); Huang, Peilin(1); Li, Zongyao(1); Wang, Pu(1,2,3); Xu, Shaolin(1)Source Title:Optics and Lasers in EngineeringLanguage:EnglishDocument Type:Journal article (JA)Abstract:The three-dimensional (3D) sculpturing of glass remains a significant challenge owing to its inherent hard and brittle nature. We develop a novel dynamic multi-focus laser sculpting (DMLS) method tailored for 3D glass fabrication. This method employs two-dimensional (2D) spatial multi-focus beams to form sectional profiles of 3D structures, which are modulated by superimposing the phase of Fresnel lenses and blazed gratings. With dynamic switching of phase diagrams on a spatial light modulator, the multi-focus beam rotates and creates a customized 3D laser-modified region inside the bulk glass. Following chemical etching helps remove the modified zones, forming ultimate 3D morphology on glass surface. The feasibility of this method hinges upon achieving uniform foci energy and narrow spatial foci intervals, essential for the precise removal of modified regions through connected crack channels during etching. We propose an extracting strategy to separate foci with random sequences into several groups to disrupt the periodicity of foci, thereby effectively weakening the unexpected Moiré fringes on the phase diagrams. This strategy enables the forming of dense foci by a single diagram with high uniformity, shortening the interval between foci. Further, for the lower surface roughness and higher precision of 3D structures, optimization of fabrication parameters is applied by experimental and numerical analysis. With the above optimization, the DMLS method is capable of carving diversified 3D glass structures, including hemispheres, cones, pyramids, semi-ellipsoids, and petal-like structures. Our method exhibits considerable versatility in processible structures with shape deviation lower than 1.9 μm, showing substantial potential in glass processing. ? 2024 Elsevier LtdAffiliations:(1) Department of Mechanical and Energy Engineering, Southern University of Science and Technology, 1088 Xueyuan Avenue, Shenzhen; 518055, China; (2) The Advanced Optical Instrument Research Department, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Xi'an Key Laboratory of High Power Laser Measurement Technology and Instrument, Xi'an; 710119, ChinaPublication Year:2024Volume:180Article Number:108278DOI Link:10.1016/j.optlaseng.2024.108278數(shù)據(jù)庫ID（收錄號(hào)）:20242016089755 -
Record 259 of
Title:A Large Aperture Static Interference Hyperspectral Imaging Data Compression Method
Author Full Names:Wang, Wei(1,2,3); Feng, Xiangpeng(1,3); Zhang, Geng(1,3); Liu, Xuebin(1,3); Li, Siyuan(1,3)Source Title:Guangzi Xuebao/Acta Photonica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:After spectral reconstruction of large aperture static interferometry remote sensing data，a spectral image data cube can be generated that contains both spatial information about the ground objects and interference information. Considering the large volume of large aperture static interferometry remote sensing data and the scarce bandwidth of space-to-earth links，it is necessary to find suitable compression methods to compress this data. Starting from the mechanism of large aperture static interferometry imaging，based on the principles of large aperture static interferometry spectral imaging and the redundant information in the data，a compression algorithm called Spectral-Interference-Optical Path Difference Redundancy Removal（SIORR） is proposed. This algorithm fully considers the similarities between the interference curves of similar ground points and the redundancy between multiple frames. The SIORR algorithm can be divided into three parts. First，it analyzes and processes the interference curves in the hyperspectral data. In large aperture static interferometry spectral imaging remote sensing images，due to the continuity of spatial distribution of adjacent ground objects，the differences between interference curves of the same category are small. By constructing a table of typical interference curves to encode representations of different categories of interference curves，indexes of matching items and necessary correction information are recorded. Each table item not only represents a specific interference curve but also serves as a reference for compressing that type of curve. During the actual compression process，each interference curve in the original data is matched with an item in the curve table，and data compression and recovery are achieved by recording the index of the matching item and necessary correction information. Subsequently，during the interferometric imaging process，there is a high similarity between different optical path difference images，specifically reflected in the texture features of the remote sensing images. By using a prediction method to remove inter-frame correlations and utilizing the high correlation between different optical path difference images，while also avoiding the decrease in correlation caused by large differences in optical path difference，this algorithm adopts a grouping strategy. Every ten different optical path difference images are grouped together，and one is selected as the reference frame. Based on this reference frame，the other nine images are predicted. After these two processing steps，the correlation between different optical path difference images in large aperture static interferometry spectral imaging data has been reduced to about 0.5，while effectively reducing the quantization bit rate of pixel data points. After processing，the main information is stored in the image residuals and curve table suitable for compression，and the errors introduced by lossy compression are relatively small，thus the interference curves restored by the spectral curves are also closer to the original spectral curves. In lossy compression，spectral data is protected. Finally，the JPEG2000 image compression algorithm is used for lossless or lossy compression. Experimental results show that for large aperture static interferometry data，the proposed SIORR algorithm can achieve a 3.1× compression ratio in lossless compression. In lossy compression，the average peak signal-to-noise ratio is about 3 dB higher than that of other comparative algorithms. The spectral angle and relative quadratic error of the spectral curves of images restored by the SIORR algorithm are better than those processed by other comparison algorithms. The remote sensing images restored by the SIORR algorithm are also better than those of other comparison algorithms. Under lossless compression conditions，the SIORR algorithm can effectively increase the compression ratio. In lossy compression，compared to other algorithms，the SIORR algorithm has a higher image peak signal-to-noise ratio，and the interference curves and spectral curves are closer to the original curves，effectively protecting the spectral information. The SIORR algorithm not only has better compression effects but also has lower complexity and is easier to port，making it more suitable for compression processing of large aperture static interferometry remote sensing images. ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) Key Laboratory of Spectral Imaging Technology, Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Shaanxi Provincial Key Laboratory of Optical Remote Sensing and Intelligent Information Processing, Xi'an; 710119, ChinaPublication Year:2024Volume:53Issue:6Article Number:0610004?1DOI Link:10.3788/gzxb20245306.0610004數(shù)據(jù)庫ID（收錄號(hào)）:20242716616440 -
Record 260 of
Title:Design and Imaging of Multi-frequency Interference System Based on T-lens Arrangement
Author Full Names:Qiao, Yu(1,2); Chen, Guixiang(1,2); Zhai, Yusheng(1,2); Liu, Gang(3); He, Weiji(1,2); Chen, Qian(1,2)Source Title:Guangzi Xuebao/Acta Photonica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:The angular resolution of conventional optical systems is limited by the size of the system aperture，and high resolution implies a larger system aperture. However，the increase of system aperture will make the volume，weight and power consumption of the whole system increase dramatically，which greatly increases the difficulty of engineering realization. Photonic integrated interferometric imaging technology is a new type of highly integrated detection technology that combines optical interferometric imaging principle and photonic integration technology，which utilizes a photonic integrated chip to replace the sensors in traditional imaging，significantly reducing the volume，weight，and power consumption of the imaging system. However，at present，this technology is still in the stage of theoretical and simulation calculation research，and the research of related experimental imaging system is relatively small，and the existing interferometric imaging system can only collect the spatial frequency of the target point by point. In order to investigate the effect of multi-frequency point sampling on photonic integrated interference technology，this paper proposes and builds a multi-frequency interference imaging system with T-shaped lens arrangement. The system selects laser as the illumination light source. The light from the laser is irradiated to the 2D grating after passing through the fiber collimator. The multi-level diffracted light through the grating is split into multiple paths and incident to the rear fiber collimator. The fiber collimator is used instead of a lens array. The lenses are divided into two groups，S group horizontally and R group vertically，and the T-distributed lens array allows for frequency acquisition of baselines in multiple directions and at different lengths. After the lens array through the optical switch to control the on-off optical path，optical switch on time signal through the optical fiber into the fiber coupler for interference. The detector is used to capture the interference signal and then the spatial frequency information of the target is solved，and the target image can be obtained by doing the inverse Fourier transform of the spectral map. We first simulate the imaging process of the system，the center wavelength of the illumination light source is set to 1 550 nm，the distance from the target to the light source is 1 m，and the orthogonal two-dimensional grating with the spatial frequencies of 80 lp/mm and 40 lp/mm in the transverse and longitudinal directions is selected as the target for the simulation，and the minimum sampling frequency of the system is 40 mm-1. In order to distinguish the target，a pair of black and white stripes of 80 lp/mm is at least 40 mm-1. In order to distinguish the target，a pair of black and white stripes of 80 lp/mm is at least 2 pixels，and the size of the received image is set to 576×576. In order to have a certain degree of redundancy，the size of the spectral image received by the lens is set to 1 152×1 152 in the simulation，corresponding to the highest frequency of 160 lp/mm，which can satisfy the demand for target detection. The actual imaging system is built under the same conditions as the simulation to image the target. After calculation，the Peak Signal to Noise Ratio（PSNR）of the simulated image is 30.79 dB，and the PSNR of the experimental reconstructed image is 27.95 dB，and the overall structure of the reconstructed image has not been changed，so the experiment successfully realizes the reconstruction of the target image. Of course，in the process of the experiment，we also found some problems in the system，such as the lack of spectrum acquisition，the influence of the external environment and other problems，to be further researched and solved. Overall，photon integrated interferometric imaging is a technology with practical value，and the design of the imaging system and the process of system imaging proposed in this paper provide guidance and direction for the practical engineering application of this technology. ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) Advanced Interdisciplinary Research Center for Optics, Nanjing University of Science and Technology, Nanjing; 210094, China; (2) College of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing; 210094, China; (3) Xi'an Institute of Optical Precision Machinery, Chinese Academy of Sciences, Xi'an; 710119, ChinaPublication Year:2024Volume:53Issue:7Article Number:0711002DOI Link:10.3788/gzxb20245307.0711002數(shù)據(jù)庫ID（收錄號(hào)）:20243116787788 -
Record 261 of
Title:Multi-wavelength and Transverse-mode-switchable Yb-doped Fiber Laser
Author Full Names:Peng, Jianao(1,2); Chen, Wei(1,2); Hou, Chaoqi(3); Liu, Dandan(1,2); Pang, Fufei(1,2); Huang, Sujuan(1,2); Wang, Tingyun(1,2)Source Title:Guangzi Xuebao/Acta Photonica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:Multi-wavelength lasers and transverse-mode-switchable lasers are expected to find applications in Wavelength Division Multiplexing （WDM） and Mode Division Multiplexing （MDM） systems. High-order transverse modes play a crucial role in the generation of cylindrical vector beams and vortex beams，making them suitable for applications such as micro-particle manipulation，quantum information，and laser material processing. While in solid-state lasers，specific transverse modes can be excited through phase and amplitude modulation，the entire laser system is relatively underdeveloped，with limited mode scalability. Therefore，the all-fiber structure of multi-wavelength and transverse-mode-switchable fiber lasers has sparked significant interest among scientists. Various technological approaches have been proposed to achieve multi-wavelength or transverse mode outputs from fiber lasers. However，there has been limited reporting on fiber lasers capable of simultaneously operating at multiple wavelengths while generating switchable transverse modes. Reported multi-wavelength and transverse mode-switchable fiber lasers often employ gain media consisting of traditional doped fibers，where the competitive advantage of the fundamental mode within the resonant cavity is significantly greater than that of higher-order modes. Consequently，these fiber lasers struggle to maintain stable and efficient output of higher-order modes. In this study，a Ring-Core Yb-Doped Fiber（RCYDF）was designed and fabricated. The unique structure of the ring-shaped doping region aligns well with the dual-peak spatial electromagnetic field distribution of the LP11 mode，prioritizing the gain acquisition for the LP11 mode within the gain fiber. This design facilitates stable oscillation and efficient output of the LP11 mode laser. Few-Mode Fiber Bragg Gratings（FMFBGs）serve not only as ideal wavelength-selective elements but also as components for achieving transverse mode switching. Utilizing a pair of FMFBGs as the laser resonant cavity and the fabricated RCYDF as the laser gain medium，a multi-wavelength and transverse-mode-switchable fiber laser was demonstrated. By simply adjusting the polarization controller placed on the RCYDF，stable laser oscillation at both single and dual wavelengths can be achieved. When operating in a single-wavelength state，two transverse modes，namely LP01 and LP11 modes，can be switched. The 3 dB linewidths for both modes are less than 0.08 nm，with a Side-Mode Suppression Ratio（SMSR）of 52.2 dB for LP01 mode and 46.5 dB for LP11 mode. The output spectra were monitored every 10 minutes over a total duration of 60 minutes. Fluctuations in the central wavelength and optical intensity of the two laser modes were observed to be 0.01 nm and 1 dB，respectively. No significant changes were observed in the spectral shape. Furthermore，the laser thresholds for LP01 and LP11 modes are 372.51 mW，and 482.51 mW，respectively，with corresponding slope efficiencies of 34.34% and 49.09%. The higher slope efficiency of the LP11 mode is attributed to the enhanced LP11 mode resonance capability of the custom-designed RCYDF compared to traditional Yb-doped fibers，making it highly valuable for applications in fiber lasers targeting higher-order mode outputs. The proposed dual-wavelength and transverse-mode-switchable fiber laser offers advantages of simplicity，ease of control，and stable operation，presenting promising applications in MDM system and laser material processing. ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai; 200444, China; (2) Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai University, Shanghai; 200444, China; (3) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, ChinaPublication Year:2024Volume:53Issue:8Article Number:0814002DOI Link:10.3788/gzxb20245308.0814002數(shù)據(jù)庫ID（收錄號(hào)）:20243917112602 -
Record 262 of
Title:Fast and Robust Restoration of Single Photon 3D Data Using Parameterized Kernel
Author Full Names:Chen, Songmao(1,3); Su, Xiuqin(1,3); Zhang, Zhenyang(1,2,3); Xu, Weihao(1,2); Wang, Jie(1,2,3); Hao, Wei(1,3)Source Title:IEEE Journal of Selected Topics in Quantum ElectronicsLanguage:EnglishDocument Type:Journal article (JA)Abstract:Single photon 3D imaging is an emerging topic for optronic sensing under extreme scenarios (e.g. spaceborne altimeter, long range imaging). However, such technique suffers from low photon counts and strong noise, which is due to either strong attenuation from the environment or reduced acquisition time. Although state-of-the-art algorithms have been proposed to achieve high resolution results from corrupted single photon 3D data, the trade-off between the restoration performance and computational complexity remains challenging. This paper presents a fast and robust restoration approach for single photon 3D data, which adaptively smooth the sparse and noisy histogram by applying a parameterized kernel and finally reconstruct the 3D image using matched filter. The implementation can be fast as the core step of the processing is generalized as a 3D convolution that can be solved by Fast Fourier Transform (FFT). The method is validated on various conditions and scenarios from Middbury dataset and real data, where the proposed method showed robust results as the competing state-of-the-art algorithms with fast implementation. ? 1995-2012 IEEE.Affiliations:(1) Chinese Academy of Sciences, Key Laboratory of Space Precision Measurement Technology, Xi'an Institute of Optics and Precision Mechanics, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Pilot National Laboratory for Marine Science and Technology, Qingdao; 266200, ChinaPublication Year:2024Volume:30Issue:1Start Page:1-8Article Number:9900008DOI Link:10.1109/JSTQE.2023.3269747數(shù)據(jù)庫ID（收錄號(hào)）:20232114129221 -
Record 263 of
Title:The nonlocal effect on FG nanobeams: an uncoupled theory and a superposition approach
Author Full Names:Pei, Y.L.(1); Gao, L.M.(1); Xu, L.(1); Huang, W.(1); Li, X.H.(1); Xu, J.T.(1); Li, L.X.(2)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:Advanced Optical Manufacturing Technologies and Applications 2024, AOMTA 2024 and 4th International Forum of Young Scientists on Advanced Optical Manufacturing, YSAOM 2024Conference Date:July 5, 2024 - July 7, 2024Conference Location:Xi'an, ChinaConference Sponsor:Advanced Optical Manufacturing Youth Expert Committee, CSOE; Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Fudan University; University of Shanghai for Science and Technology; Xi'an Institute of Optics and Precision Mechanics of CAS; Xi'an Technological UniversityAbstract:The nonlocal effect is studied for a functionally graded (FG) nanobeam ， which is widely used in the Nanoelectromechanical system. First, the higher-order deformation mode is introduced in terms of the generalized displacements defined for the cross section. Generalized stresses and strains are accordingly defined and uncoupled constitutive relations are derived by combining the nonlocal elasticity theory. Next, according to the principle of virtual work, an uncoupled beam theory is established for a FG nanobeam, including governing equations and boundary conditions. The current work shows that, due to the decoupling of bending, tension and higher-order bending, the nonlocal effect can be attributed to the superimposition of equivalent initial generalized stresses. Typical FG nanobeam problems are analytically solved. It is found that the nonlocal effect on the deflection of FG nanobeam is case dependent for different boundary constraints. ? 2024 SPIE.Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics (CAS), Shaanxi, Xi'an; 710119, China; (2) State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Key Laboratory of Environment and Control for Flight Vehicle, School of Aerospace Engineering, Xi’an Jiaotong University, Shaanxi, Xi’an; 710049, ChinaPublication Year:2024Volume:13280Article Number:132800LDOI Link:10.1117/12.3046874數(shù)據(jù)庫ID（收錄號(hào)）:20244917483520 -
Record 264 of
Title:Alternating projection combined with fast gradient projection (FGP-AP) method for intensity-only measurement optical diffraction tomography in LED array microscopy
Author Full Names:Yang, Zewen(1); Zhang, Lu(1,2); Liu, Tong(1); Wang, Huijun(1); Tang, Zhiyuan(3); Zhao, Hong(1,2); Yuan, Li(4); Zhang, Zhenxi(5); Liu, Xiaolong(6)Source Title:Biomedical Optics ExpressLanguage:EnglishDocument Type:Journal article (JA)Abstract:Optical diffraction tomography (ODT) is a powerful label-free measurement tool that can quantitatively image the three-dimensional (3D) refractive index (RI) distribution of samples. However, the inherent "missing cone problem,"limited illumination angles, and dependence on intensity-only measurements in a simplified imaging setup can all lead to insufficient information mapping in the Fourier domain, affecting 3D reconstruction results. In this paper, we propose the alternating projection combined with the fast gradient projection (FGP-AP) method to compensate for the above problem, which effectively reconstructs the 3D RI distribution of samples using intensity-only images captured from LED array microscopy. The FGP-AP method employs the alternating projection (AP) algorithm for gradient descent and the fast gradient projection (FGP) algorithm for regularization constraints. This approach is equivalent to incorporating prior knowledge of sample non-negativity and smoothness into the 3D reconstruction process. Simulations demonstrate that the FGP-AP method improves reconstruction quality compared to the original AP method, particularly in the presence of noise. Experimental results, obtained from mouse kidney cells and label-free blood cells, further affirm the superior 3D imaging efficacy of the FGP-AP method. ? 2024 Optica Publishing Group.Affiliations:(1) State Key Laboratory for Manufacturing System Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (2) School of Instrument Science and Technology, Xi'an Jiaotong University, Xi'an; 710049, China; (3) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (4) First Affiliated Hospital, Xi'an Jiaotong University, Shannxi, Xi'an; 710049, China; (5) Key Laboratory of Biomedical Information Engineering of Ministry of Education, Xi'an Jiaotong University, Xi'an; 710049, China; (6) Mengchao Hepatobiliary Hospital of Fujian Medical University, The United Innovation of Mengchao Hepatobiliary Technology Key Laboratory of Fujian Provincey, Fuzhou; 350025, ChinaPublication Year:2024Volume:15Issue:4Start Page:2534-2542DOI Link:10.1364/BOE.518955數(shù)據(jù)庫ID（收錄號(hào)）:20241815995654