2024
2024
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Record 253 of
Title:Analysis and simulation of the effect of large optical range difference of common path coherent-dispersion spectrometer on the detection of exoplanet radial velocities
Author Full Names:Guan, Shouxin; Liu, Bin; Chen, Shasha; Wu, Yinhua; Wang, Feicheng; Wang, Shaofei; Liu, Xuebin; Wei, RuyiSource Title:OPTICS COMMUNICATIONSLanguage:EnglishDocument Type:ArticleKeywords Plus:FIXED-DELAY INTERFEROMETRYAbstract:The Exoplanet Explorer common-path coherent-dispersion spectrometer (CODES) utilizes a unique combination of an asymmetric common path Sagnac interferometer and a low to medium resolution spectrometer. The ideal optical range difference (OPD) interval for CODES is OPD is an element of {15.06 mm, 19.45 mm}; however, the OPD of CODES is 64.3 mm to achieve better detection accuracy. Though they will increase the accuracy of detection, large OPDs outside of the ideal interval will also reduce the contrast of the interference fringes, making phase changes more hazy. This may also significantly affect the radial velocity inversion and reduce CODES's instrumental accuracy. This study creates an inverse tone mapping operator based on the photographic model and designs an inverse tone mapping algorithm called CODESCE. The outcomes of the experiments demonstrate that the tone mapping algorithm CODESCE in this work is appropriate for enhancing the contrast of interference fringe images with high OPD, and it can enhance the contrast of interference fringes by three orders of magnitude when OPD = 64.3 mm; the processed interference fringes are located in the range of interference fringe curves of the optimal OPD. By comparison with other current approaches, the suggested algorithm yields superior processing outcomes.Addresses:[Guan, Shouxin; Liu, Bin; Chen, Shasha; Wang, Feicheng; Liu, Xuebin] Univ Chinese Acad Sci, Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol CAS, Xian 710119, Peoples R China; [Guan, Shouxin; Liu, Bin; Wang, Feicheng] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Wu, Yinhua] Xian Technol Univ, Sch Optoelect Engn, Xian 710021, Peoples R China; [Wei, Ruyi] Hubei Luojia Lab, Wuhan 430072, Peoples R China; [Wei, Ruyi] Wuhan Inst Quantum Technol, Wuhan 430072, Peoples R China; [Wang, Shaofei; Wei, Ruyi] Wuhan Univ, Sch Elect Informat, Wuhan 430072, Peoples R ChinaAffiliations:Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Xi'an Technological University; Wuhan UniversityPublication Year:2024Volume:561Article Number:130443DOI Link:http://dx.doi.org/10.1016/j.optcom.2024.130443數據庫ID（收錄號）:WOS:001218457700001 -
Record 254 of
Title:High refractive index chalcogenide polymer-based planar refractive microlens components
Author Full Names:Liu, Feng; Zhang, Jiawei; Guo, Zhaojin; Zhou, Liang; Li, Xianda; Lei, Xiaowei; Ji, Ruonan; Zhang, Jiwei; Li, Peng; Liu, Sheng; Zhu, Xiangping; Zhao, JianlinSource Title:OPTICS AND LASERS IN ENGINEERINGLanguage:EnglishDocument Type:ArticleKeywords Plus:INVERSE VULCANIZATION; OPTICAL-PROPERTIES; ELEMENTAL SULFUR; FABRICATION; DESIGN; ARRAYAbstract:Planar microlens components are highly desired in micro-systems for their compactness and ability to integrate with other planar elements. In this paper, we propose an alternative facile approach to producing positive planar microlens components by infilling concave microlens featured glass encapsulation with high refractive index chalcogenide polymer. The presented refractive microlens components have several advantages: cost-efficient to process, high transmission in broadband spectrum, the ability to generate real focus and real image, and being well-protected by its planar glass encapsulation. Both single and arrayed samples were fabricated to demonstrate the effectiveness of the manufacturing process. The optical properties of the fabricated samples, including phase modulation, imaging performance, and spectrally operational region, were thoroughly characterized. Wavefront calibration with the prepared sample revealed its potential application in practical engineering fields.Addresses:[Liu, Feng; Zhang, Jiawei; Guo, Zhaojin; Zhou, Liang; Lei, Xiaowei; Ji, Ruonan; Zhang, Jiwei; Li, Peng; Liu, Sheng; Zhao, Jianlin] Northwestern Polytech Univ, Key Lab Light Field Manipulat & Informat Acquisit, Shaanxi Key Lab Opt Informat Technol, Shaanxi Basic Discipline Liquid Phys Res Ctr,Minis, Xian 710129, Peoples R China; [Li, Xianda; Zhu, Xiangping] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R ChinaAffiliations:Northwestern Polytechnical University; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:178Article Number:108200DOI Link:http://dx.doi.org/10.1016/j.optlaseng.2024.108200數據庫ID（收錄號）:WOS:001224921500001 -
Record 255 of
Title:High accuracy ranging for space debris with spaceborne single photon Lidar
Author Full Names:Tian, Yuan; Hu, Xiaodong; Chen, Songmao; Zhao, Yixin; Zhang, Xuan; Wang, Dingjie; Xu, Weihao; Xie, Meilin; Hao, Wei; Su, XiuqinSource Title:OPTICS EXPRESSLanguage:EnglishDocument Type:ArticleAbstract:The increasing risk posed by space debris highlights the need for accurate localization techniques. Spaceborne single photon Lidar (SSPL) offers a promising solution, overcoming the limitations of traditional ground -based systems by providing expansive coverage and superior maneuverability without being hindered by weather, time, or geographic constraints. This study introduces a novel approach leveraging non -parametric Bayesian inference and the Dirichlet process mixture model (DPMM) to accurately determine the distance of space debris in low Earth orbit (LEO), where debris exhibits nonlinear, high dynamic motion characteristics. By integrating extended Kalman filtering (EKF) for range gating, our method captures the temporal distribution of reflected photons, employing Markov chain Monte Carlo (MCMC) for iterative solutions. Experimental outcomes demonstrate our method's superior accuracy over conventional statistical techniques, establishing a clear correlation between radial absolute velocity and ranging error, thus significantly enhancing monostatic space debris localization.Addresses:[Tian, Yuan; Chen, Songmao; Zhao, Yixin; Zhang, Xuan; Wang, Dingjie; Xu, Weihao; Xie, Meilin; Hao, Wei; Su, Xiuqin] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Space Precis Measurement Technol, Xian 710119, Peoples R China; [Tian, Yuan; Hu, Xiaodong; Chen, Songmao; Zhao, Yixin; Zhang, Xuan; Wang, Dingjie; Xu, Weihao; Xie, Meilin; Hao, Wei; Su, Xiuqin] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Tian, Yuan; Zhao, Yixin; Zhang, Xuan; Wang, Dingjie; Xu, Weihao] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Tian, Yuan; Chen, Songmao; Zhao, Yixin; Zhang, Xuan; Wang, Dingjie; Xu, Weihao; Xie, Meilin; Hao, Wei; Su, Xiuqin] Pilot Natl Lab Marine Sci & Technol, Qingdao 266200, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Laoshan LaboratoryPublication Year:2024Volume:32Issue:7Start Page:12318End Page:12339DOI Link:http://dx.doi.org/10.1364/OE.519002數據庫ID（收錄號）:WOS:001207095200003 -
Record 256 of
Title:Enhancing the spatial resolution of time-of-flight based non-line-of-sight imaging via instrument response function deconvolution
Author Full Names:Wang, Dingjie; Hao, Wei; Tian, Yuyuan; Xu, Weihao; Tian, Yuan; Cheng, Haihao; Chen, Songmao; Zhang, Ning; Zhu, Wenhua; Su, XiuqinSource Title:OPTICS EXPRESSLanguage:EnglishDocument Type:ArticleKeywords Plus:TRACKING; CORNERSAbstract:Non-line-of-sight (NLOS) imaging retrieves the hidden scenes by utilizing the signals indirectly reflected by the relay wall. Benefiting from the picosecond-level timing accuracy, time-correlated single photon counting (TCSPC) based NLOS imaging can achieve theoretical spatial resolutions up to millimeter level. However, in practical applications, the total temporal resolution (also known as total time jitter, TTJ) of most current TCSPC systems exceeds hundreds of picoseconds due to the combined effects of multiple electronic devices, which restricts the underlying spatial resolution of NLOS imaging. In this paper, an instrument response function deconvolution (IRF-DC) method is proposed to overcome the constraints of a TCSPC system's TTJ on the spatial resolution of NLOS imaging. Specifically, we model the transient measurements as Poisson convolution process with the normalized IRF as convolution kernel, and solve the inverse problem with iterative deconvolution algorithm, which significantly improves the spatial resolution of NLOS imaging after reconstruction. Numerical simulations show that the IRF-DC facilitates light-cone transform and frequency-wavenumber migration solver to achieve successful reconstruction even when the system's TTJ reaches 1200 ps, which is equivalent to what was previously possible when TTJ was about 200 ps. In addition, the IRF-DC produces satisfactory reconstruction outcomes when the signal-to-noise ratio (SNR) is low. Furthermore, the effectiveness of the proposed method has also been experimentally verified. The proposed IRF-DC method is highly applicable and efficient, which may promote the development of high-resolution NLOS imaging.Addresses:[Wang, Dingjie; Hao, Wei; Tian, Yuyuan; Xu, Weihao; Tian, Yuan; Chen, Songmao; Su, Xiuqin] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Space Precis Measurement Technol, Xian 710719, Peoples R China; [Wang, Dingjie; Tian, Yuyuan; Xu, Weihao; Tian, Yuan; Cheng, Haihao] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Hao, Wei; Chen, Songmao; Su, Xiuqin] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Ctr Shared Technol & Facil, Xian 710119, Peoples R China; [Hao, Wei; Chen, Songmao; Su, Xiuqin] Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao 266237, Peoples R China; [Cheng, Haihao] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Zhang, Ning] Chinese Acad Sci, Key Lab Spectral Imaging Technol, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Zhu, Wenhua] Jiujiang Univ, Sch Elect & Informat Engn, Jiujiang 332005, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Laoshan Laboratory; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Jiujiang UniversityPublication Year:2024Volume:32Issue:7Start Page:12303End Page:12317DOI Link:http://dx.doi.org/10.1364/OE.518767數據庫ID（收錄號）:WOS:001207095200002 -
Record 257 of
Title:Enhanced optical nonlinearity of epsilon-near-zero metasurface by quasi-bound state in the continuum
Author Full Names:Shi, Wenjuan; Wang, Zhaolu; Zhang, Changchang; Zhang, Congfu; Li, Wei; Liu, HongjunSource Title:MATERIALS TODAY NANOLanguage:EnglishDocument Type:ArticleKeywords Plus:INDIUM TIN OXIDEAbstract:Bound states in the continuum (BICs) provide a powerful way to enhance the nonlinear properties of materials, epsilon-near-zero (ENZ) materials are considered as promising candidates with strong nonlinearities. However, the realization of BIC based on ENZ materials in the near-infrared (NIR) is very challenging due to the large loss in the NIR. Here, a high-quality quasi -BIC based on the ENZ metasurface is proposed for the first time, which is composed of patterned ENZ films embedded in a dielectric-metal hybrid structure, and realizes destructive interference between the Berreman mode and photonic mode to form the Friedrich-Wintergen BIC (FW-BIC). The electric field is strongly confined in the ENZ film, resulting in considerable field enhancement, and the nonlinear refractive index coefficient is 1.63 x 10 -12 m 2 /W, which is three orders of magnitude larger than that of the ITO film. The instantaneous response time is 600 fs and extremely high modulation speed up to the THz level. Benefiting from the perfect absorption and narrow linewidth of quasi -BIC and the change in refractive index of the metasurface induced by Kerr nonlinearity, the absolute modulation is from near-zero to 92% with an extinction ratio of 23.2 dB. It provides a promising platform for the development of integrated ultrafast highspeed photonics.Addresses:[Shi, Wenjuan; Wang, Zhaolu; Zhang, Changchang; Zhang, Congfu; Li, Wei; Liu, Hongjun] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Shi, Wenjuan; Wang, Zhaolu; Zhang, Changchang; Zhang, Congfu; Li, Wei] Univ Chinese Acad Sci, Beijing 100084, Peoples R China; [Liu, Hongjun] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Shanxi UniversityPublication Year:2024Volume:26Article Number:100474DOI Link:http://dx.doi.org/10.1016/j.mtnano.2024.100474數據庫ID（收錄號）:WOS:001220579300001 -
Record 258 of
Title:Effect of atmospheric environment on the stability of secondary electron emission from magnesium oxide and alumina surfaces
Author Full Names:Lian, Zhuoxi; Zhu, Xiangping; Wang, Dan; Meng, Xiangchen; He, YongningSource Title:JOURNAL OF PHYSICS D-APPLIED PHYSICSLanguage:EnglishDocument Type:ArticleKeywords Plus:MGO; SIMULATION; DISCHARGE; COATINGS; DIAMOND; YIELDAbstract:MgO and Al2O3 are two typical ceramics with high secondary electron yield (SEY) and are widely applied in electron multiplier devices as dynode coating. However, dynodes in multipliers are inevitably exposed to various environments, degenerating their SEY performance. To specify the influence of the atmospheric environment on SEY for MgO and Al2O3 ceramics, we conducted environmental stability experiments on MgO and Al2O3 nanofilms. By exposing the nanofilms fabricated by atomic layer deposition to air for certain durations, it was found that although the MgO film possessed high SEY, its SEY decreased significantly as the storage duration increased, specifically, its SEY peak value (delta m) decreased from 5.97 to 3.35 after 180 d. Whereas the SEY of the Al2O3 film changed very little with the storage duration extending, its delta m decreased from 4.01 to 3.70 after 180 d, indicating the Al2O3 film had good SEY environmental stability. To reveal the mechanism of SEY degradation, the modification analysis of surface composition was implemented. It was found that the surface of MgO film underwent degradation besides unavoidable contamination, generating Mg(OH)2 and MgCO3. Whereas, there is no chemical reaction occurred on the Al2O3 surface. Combining the advantages of high SEY of MgO and good environmental stability of Al2O3, several Al2O3/MgO double-layer nanofilms were prepared. The delta m value of 20 nm MgO nanofilms covered by 1 nm Al2O3, decreased from 4.90 to 4.56, with a reduction of only 6.94% after 180 d. The results showed that the Al2O3 film achieved effective protection of the MgO film. The SEY environmental stability of the double-layer structure was significantly improved, and the effect of thickness on SEY was theoretically interpreted. This work makes significant sense for understanding the influence of the environment on the SEY for MgO and Al2O3, which has potential applications in electron multipliers.Addresses:[Lian, Zhuoxi; Wang, Dan; Meng, Xiangchen; He, Yongning] Xi An Jiao Tong Univ, Sch Microelect, Xian 710049, Peoples R China; [Zhu, Xiangping] ZhongKe Atom Precise Mfg Technol Co Ltd, Xian 710119, Peoples R China; [Zhu, Xiangping] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R ChinaAffiliations:Xi'an Jiaotong University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:57Issue:12Article Number:125302DOI Link:http://dx.doi.org/10.1088/1361-6463/ad15c0數據庫ID（收錄號）:WOS:001127373200001 -
Record 259 of
Title:Adaptive location method for film cooling holes based on the design intent of the turbine blade
Author Full Names:Hou, Yaohua; Wang, Jing; Mei, Jiawei; Zhao, HualongSource Title:INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGYLanguage:EnglishDocument Type:ArticleKeywords Plus:STRATEGY; ROBUSTAbstract:Due to the inevitable deviation of the casting process, the dimensional error of the turbine blade is introduced. As a result, the location datum of the film cooling holes is changed, which has an impact on the machining accuracy. The majority of pertinent studies concentrate on the rigid location approach for the entire blade, which results in a modest relative position error of the blade surface but still fails to give the exact position and axial direction of the film cooling holes of the deformed blade. In this paper, the entire deformation of the blade cross-section curve is divided into a number of deformation combinations of the mean line curve based on the construction method of the blade design intent. The exact location of the film cooling holes in the turbine blade with deviation is therefore efficiently solved by a flexible deformation of the blade that optimises the position and axial direction of the holes. The verification demonstrates that the novel method can significantly reduce both the contour deviation of the blade surface and the location issue of the film cooling holes. After machining experiments, the maximum position deviation of the holes is reduced by approximately 80% compared to the rigid location method of the entire blade, and the average value and standard deviation are also decreased by about 70%.Addresses:[Hou, Yaohua; Wang, Jing; Zhao, Hualong] Chinese Acad Sci, State Key Lab Transient Opt & Photon, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Mei, Jiawei] Beijing Jiaotong Univ, Key Lab Vehicle Adv Mfg Measuring & Control Techno, Minist Educ, Beijing 100044, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Beijing Jiaotong UniversityPublication Year:2024Volume:132Issue:3-4Start Page:1439End Page:1452DOI Link:http://dx.doi.org/10.1007/s00170-024-13456-4數據庫ID（收錄號）:WOS:001190088800005 -
Record 260 of
Title:The role of eye movement signals in non-invasive brain-computer interface typing system
Author Full Names:Liu, Xi; Hu, Bingliang; Si, Yang; Wang, QuanSource Title:MEDICAL & BIOLOGICAL ENGINEERING & COMPUTINGLanguage:EnglishDocument Type:ReviewKeywords Plus:SSVEP; EEG; SPELLERAbstract:Brain-Computer Interfaces (BCIs) have shown great potential in providing communication and control for individuals with severe motor disabilities. However, traditional BCIs that rely on electroencephalography (EEG) signals suffer from low information transfer rates and high variability across users. Recently, eye movement signals have emerged as a promising alternative due to their high accuracy and robustness. Eye movement signals are the electrical or mechanical signals generated by the movements and behaviors of the eyes, serving to denote the diverse forms of eye movements, such as fixations, smooth pursuit, and other oculomotor activities like blinking. This article presents a review of recent studies on the development of BCI typing systems that incorporate eye movement signals. We first discuss the basic principles of BCI and the recent advancements in text entry. Then, we provide a comprehensive summary of the latest advancements in BCI typing systems that leverage eye movement signals. This includes an in-depth analysis of hybrid BCIs that are built upon the integration of electrooculography (EOG) and eye tracking technology, aiming to enhance the performance and functionality of the system. Moreover, we highlight the advantages and limitations of different approaches, as well as potential future directions. Overall, eye movement signals hold great potential for enhancing the usability and accessibility of BCI typing systems, and further research in this area could lead to more effective communication and control for individuals with motor disabilities.Graphical AbstractThis article delves into three pivotal components of the BCI typing system: data, algorithms, and interaction. The system leverages eye movement and EEG data as inputs, which are processed through algorithms for data fusion, feature extraction, and classification to yield output results. Furthermore, it facilitates real-time interaction by providing visual feedback via an efficient user interface.Addresses:[Liu, Xi; Hu, Bingliang; Wang, Quan] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol, Xian 710119, Peoples R China; [Liu, Xi] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Liu, Xi; Hu, Bingliang; Wang, Quan] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Biomed Spect Xian, Xian 710119, Peoples R China; [Si, Yang] Sichuan Acad Med Sci & Sichuan Prov Peoples Hosp, Dept Neurol, Chengdu 611731, Peoples R China; [Si, Yang] Univ Elect Sci & Technol China, Chengdu 611731, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Sichuan Provincial People's Hospital; University of Electronic Science & Technology of ChinaPublication Year:2024Volume:62Issue:7Start Page:1981End Page:1990DOI Link:http://dx.doi.org/10.1007/s11517-024-03070-7數據庫ID（收錄號）:WOS:001190070100001 -
Record 261 of
Title:Imaging-based measurement of lunar dust velocity and particle size
Author Full Names:Dai, YiDan; Xue, Bin; Zhao, YiYi; Tao, JinYou; Yang, JianFengSource Title:APPLIED OPTICSLanguage:EnglishDocument Type:ArticleKeywords Plus:SYSTEM; MOTIONAbstract:This paper introduces an optical-mechanical system designed for the dynamic detection and analysis of lunar dust, typically characterized as particles under 20 micrometers on the lunar surface. The system's design is both compact and lightweight, aligning with the payload constraints of lunar exploration missions. It is capable of real-time tracking and recording the motion of lunar dust at various altitudes, a crucial capability for understanding the environmental dynamics of the lunar surface. By capturing images and applying sophisticated algorithms, the system accurately measures the velocity and size of dust particles. This approach significantly advances the quantitative analysis of lunar dust, especially during agitation events, filling a critical gap in our current understanding of lunar surface phenomena. The insights gained from this study are not only pivotal for developing theoretical models of lunar surface air flow disturbances and dust movement but also instrumental in designing effective dust mitigation and hazard avoidance strategies for future lunar missions, thereby enhancing both scientific knowledge and the engineering applications in lunar exploration. (c) 2024 Optica Publishing GroupAddresses:[Dai, YiDan; Xue, Bin; Zhao, YiYi; Tao, JinYou; Yang, JianFeng] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Shaanxi, Peoples R China; [Dai, YiDan] Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CASPublication Year:2024Volume:63Issue:9Start Page:2218End Page:2226DOI Link:http://dx.doi.org/10.1364/AO.516801數據庫ID（收錄號）:WOS:001209263400002 -
Record 262 of
Title:Optical design of a visible/short-wave infrared common-aperture optical system with a long focal length and a wide field-of-view
Author Full Names:Yan, Aqi; Chen, Weining; Li, Qianxi; Guo, Min; Wang, HaoSource Title:APPLIED OPTICSLanguage:EnglishDocument Type:ArticleAbstract:Addressing the urgent need for long-distance dim target detection with a wide field-of-view and high sensitivity, this paper proposes a visible and short-infrared dual-band common-aperture optical system characterized by a broad field and extended focal length. To achieve system miniaturization and high-sensitivity target detection, the visible and infrared optical systems share a Ritchey-Chretien primary and secondary mirror. The primary optical path is segmented into visible light (0.45-0.75 mu m) and short-wave infrared (SWIR) (2-3 mu m) bands by a dichroic spectral splitter prism. The SWIR optical system utilizes four short-wave cooled infrared detectors, and wide-field stitching is achieved using a field-of-view divider. While ensuring the high cold-shield efficiency of cooled infrared detectors, this common-aperture optical system delivers visible and SWIR dual-band images with expansive fields, elongated focal lengths, and sizable apertures. The visible-light optical system has a focal length of 277 mm, a fieldof-view of 2.3 degrees x 2.3 degrees , and an entrance pupil diameter of 130 mm. Meanwhile, the SWIR optical system features a focal length of 480 mm, a field-of-view of 2.26 degrees x 1.8 degrees and an entrance pupil diameter of 160 mm. The design outcomes suggest that the imaging quality of the optical system approaches the diffraction limit. This visible/SWIR common-aperture optical system exhibits high sensitivity, a large field-of-view, compact structure, and excellent imaging quality, thereby meeting the requirements for long-distance dim target detection and imaging. (c) 2024 Optica Publishing GroupAddresses:[Yan, Aqi; Chen, Weining; Li, Qianxi; Guo, Min; Wang, Hao] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Shaanxi, Peoples R China; [Yan, Aqi; Chen, Weining; Wang, Hao] Xian Key Lab Aircraft Opt Imaging & Measurement Te, Xian 710119, Shaanxi, Peoples R China; [Li, Qianxi] Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CASPublication Year:2024Volume:63Issue:9Start Page:2382End Page:2391DOI Link:http://dx.doi.org/10.1364/AO.517643數據庫ID（收錄號）:WOS:001214358400001 -
Record 263 of
Title:An innovative 16-bit projection display based on quaternary hybrid light modulation
Author Full Names:Pan, Yue; Cao, Yajie; Xu, Liang; Hu, Motong; Jiang, Qing; Li, Shuqin; Lu, XiaoweiSource Title:OPTICS AND LASERS IN ENGINEERINGLanguage:EnglishDocument Type:ArticleKeywords Plus:ERROR SPLITTING ALGORITHM; SYSTEMAbstract:Conventional spatial light modulators (SLM) can only be used for projecting 8 -bit or 10 -bit images at normal frame rate. Therefore, commercial high dynamic range (HDR) displays typically focus on boosting the contrast while neglecting to raise the bit -depth. Existing methods for high bit -depth display generally rely on stacking two SLMs to modulate the outgoing beam twice, namely multiplicative modulation, resulting in many troubles such as low optical efficiency, difficulty in pixel -level alignment, and complex image rendering algorithm. In this paper, an innovative quaternary hybrid light modulation (QHLM) based projection display is proposed and realized. By illuminating two parallel digital micro -mirror devices (DMDs) with different light intensities, the quaternary digit -planes (QDs) with four gray levels are able to be modulated rapidly. Aiming at this ability, the quaternary pulse width modulation (QPWM) is incorporated with the quaternary light -intensity modulation (QLM) to fundamentally improve the modulation efficiency compared to the binary light modulation mode. Furthermore, the quaternary digit -plane decomposition (QDD) based image splitting algorithm is adopted to split a high bit -depth image into two images that drive two DMDs respectively. The prototype is designed and built to verify the feasibility of the QHLM based projection display. The experimental results demonstrate that the prototype can project 16 -bit images at 220 fps. Through additive modulation of two DMDs in parallel, the QHLM entirely avoids the drawbacks of multiplicative modulation. As a completely different technology, the QHLM has a great potential for HDR projection applications.Addresses:[Pan, Yue; Cao, Yajie; Hu, Motong; Lu, Xiaowei] Changchun Univ Sci & Technol, Sch Optoelect Engn, Changchun 130022, Jilin, Peoples R China; [Pan, Yue] Minist Educ, Key Lab Opt Control & Opt Informat Transmiss Techn, Changchun 130022, Jilin, Peoples R China; [Xu, Liang] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Shanxi, Peoples R China; [Jiang, Qing; Li, Shuqin] Baicheng Cent Hosp, Baicheng 137000, Jilin, Peoples R ChinaAffiliations:Changchun University of Science & Technology; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:178Article Number:108171DOI Link:http://dx.doi.org/10.1016/j.optlaseng.2024.108171數據庫ID（收錄號）:WOS:001224685900001 -
Record 264 of
Title:An efficient multi-scale transformer for satellite image dehazing
Author Full Names:Yang, Lei; Cao, Jianzhong; Chen, Weining; Wang, Hao; He, LangSource Title:EXPERT SYSTEMSLanguage:EnglishDocument Type:ArticleAbstract:Given the impressive achievement of convolutional neural networks (CNNs) in grasping image priors from extensive datasets, they have been widely utilized for tasks related to image restoration. Recently, there is been significant progress in another category of neural architectures-Transformers. These models have demonstrated remarkable performance in natural language tasks and higher-level vision applications. Despite their ability to address some of CNNs limitations, such as restricted receptive fields and adaptability issues, Transformer models often face difficulties when processing images with a high level of detail. This is because the complexity of the computations required increases significantly with the image's spatial resolution. As a result, their application to most high-resolution image restoration tasks becomes impractical. In our research, we introduce a novel Transformer model, named DehFormer, by implementing specific design modifications in its fundamental components, for example, the multi-head attention and feed-forward network. Specifically, the proposed architecture consists of the three modules, that is, (a) multi-scale feature aggregation network (MSFAN), (b) the gated-Dconv feed-forward network (GFFN), (c) and the multi-Dconv head transposed attention (MDHTA). For the MDHTA module, our objective is to scrutinize the mechanics of scaled dot-product attention through the utilization of per-element product operations, thereby bypassing the need for matrix multiplications and operating directly in the frequency domain for enhanced efficiency. For the GFFN module, which enables only the relevant and valuable information to advance through the network hierarchy, thereby enhancing the efficiency of information flow within the model. Extensive experiments are conducted on the SateHazelk, RS-Haze, and RSID datasets, resulting in performance that significantly exceeds that of existing methods.Addresses:[Yang, Lei; Cao, Jianzhong; Chen, Weining; Wang, Hao] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian, Peoples R China; [Yang, Lei; Cao, Jianzhong] Univ Chinese Acad Sci, Sch Comp Sci & Technol, Beijing, Peoples R China; [He, Lang] Xian Univ Posts & Telecommun, Sch Comp Sci & Technol, 618 Changan West St, Xian 710121, Peoples R China; [He, Lang] Xian Univ Posts & Telecommun, Shaanxi Key Lab Network Data Anal & Intelligent Pr, Xian, Peoples R China; [He, Lang] Xian Univ Posts & Telecommun, Xian Key Lab Big Data & Intelligent Comp, Xian, Peoples R China; [Yang, Lei] Xian Inst Opt & Precis Mech, Sch Comp Sci & Technol, 17 Xinxi Rd,New Ind Pk, Xian 710119, Shaanxi, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Xi'an University of Posts & Telecommunications; Xi'an University of Posts & Telecommunications; Xi'an University of Posts & Telecommunications; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:41Issue:8DOI Link:http://dx.doi.org/10.1111/exsy.13575數據庫ID（收錄號）:WOS:001187289200001