2024
2024
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Record 85 of
Title:Hierarchical Semantic-Guided Contextual Structure-Aware Network for Spectral Satellite Image Dehazing
Author Full Names:Yang, Lei(1,2); Cao, Jianzhong(1,2); Wang, Hua(1,2); Dong, Sen(1); Ning, Hailong(3)Source Title:Remote SensingLanguage:EnglishDocument Type:Journal article (JA)Abstract:Haze or cloud always shrouds satellite images, obscuring valuable geographic information for military surveillance, natural calamity surveillance and mineral resource exploration. Satellite image dehazing (SID) provides the possibility for better applications of satellite images. Most of the existing dehazing methods are tailored for natural images and are not very effective for satellite images with non-homogeneous haze since the semantic structure information and inconsistent attenuation are not fully considered. To tackle this problem, this study proposes a hierarchical semantic-guided contextual structure-aware network (SCSNet) for spectral satellite image dehazing. Specifically, a hybrid CNN–Transformer architecture integrated with a hierarchical semantic guidance (HSG) module is presented to learn semantic structure information by synergetically complementing local representation from non-local features. Furthermore, a cross-layer fusion (CLF) module is specially designed to replace the traditional skip connection during the feature decoding stage so as to reinforce the attention to the spatial regions and feature channels with more serious attenuation. The results on the SateHaze1k, RS-Haze, and RSID datasets demonstrated that the proposed SCSNet can achieve effective dehazing and outperforms existing state-of-the-art methods. ? 2024 by the authors.Affiliations:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Computer Science and Technology, Xi’an University of Posts and Telecommunications, Xi’an; 710121, ChinaPublication Year:2024Volume:16Issue:9Article Number:1525DOI Link:10.3390/rs16091525數(shù)據(jù)庫ID（收錄號）:20242016092646 -
Record 86 of
Title:Rapid Solidification of Invar Alloy
Author Full Names:He, Hanxin(1); Yao, Zhirui(2); Li, Xuyang(3); Xu, Junfeng(2)Source Title:MaterialsLanguage:EnglishDocument Type:Journal article (JA)Abstract:The Invar alloy has excellent properties, such as a low coefficient of thermal expansion, but there are few reports about the rapid solidification of this alloy. In this study, Invar alloy solidification at different undercooling (ΔT) was investigated via glass melt-flux techniques. The sample with the highest undercooling of ΔT = 231 K (recalescence height 140 K) was obtained. The thermal history curve, microstructure, hardness, grain number, and sample density of the alloy were analyzed. The results show that with the increase in solidification undercooling, the XRD peak of the sample shifted to the left, indicating that the lattice constant increased and the solid solubility increased. As the solidification of undercooling increases, the microstructure changes from large dendrites to small columnar grains and then to fine equiaxed grains. At the same time, the number of grains also increases with the increase in the undercooling. The hardness of the sample increases with increasing undercooling. If ΔT ≥ 181 K (128 K), the grain number and the hardness do not increase with undercooling. ? 2023 by the authors.Affiliations:(1) School of Civil Engineering, Xi’an University of Architecture and Technology, No. 13 Yanta Road, Xi’an; 710055, China; (2) School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an; 710021, China; (3) Xi’an Institute of Optics and Precision Mechanics, Xi’an; 710119, ChinaPublication Year:2024Volume:17Issue:1Article Number:231DOI Link:10.3390/ma17010231數(shù)據(jù)庫ID（收錄號）:20240315384601 -
Record 87 of
Title:Computational polarized colorful Fourier ptychography imaging: a novel information reuse technique of polarization of scattering light field
Author Full Names:Meng, Xiang(1,2,3,4); Piao, He(1); Tian-Yu, Wang(1); Lin, Yuan(1); Kai, Deng(1); Fei, Liu(1,2,4); Xiao-Peng, Shao(1,2,4)Source Title:Wuli Xuebao/Acta Physica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:Fourier ptychography for high-resolution imaging has been a revolutionizing technical, since it can provide abundant information about target scene by changing illumination or pupil scanning. However, many objects are covered by dynamic scattering media, such as biological tissues and mist, that disrupts the light paths and forms the scattering wall, let alone high-resolution imaging. It is worth noting that the scatting effect caused by the scattering media will reduce the correlation of scattered light field, which makes the information aliasing difficult to extract. The situation becomes worse if the image scene is in color. Typically, the wavefront shaping, optical transmission matrix, and speckle correlation technique can successfully recover hidden targets form the scattered light field. Notably, the physical model of conventional method is limited by the difficultly in extracting target information from the strong scattering environment, especially in broadband light illumination imaging. Thus, it is limited to achieve super-resolution color imaging through scattering media by utilizing the current techniques. In this work, we present a computational polarized colorful Fourier ptychography imaging approach for super-resolution perspective in broadband dynamic scattering media. In order to address the challenge of current imaging methods that is limited by the width of the light spectrum, the polarization characteristics of the scattered-light-field are explored. After retrieving a series of sub-polarized images, which bring the information about different frequencies caused by the motion of scattering media and are processed by the common-mode rejection of polarization characteristic, our computational approach utilizes the iterative optimization algorithm to recover the scene. Notably, owning to the difference between the target scattering information and background scattering information of scattered light fields with different polarization rotation angles, we can obtain two images in which the target information and the background information are dominant in the scattered field. Afterwards, a series of images containing target information and background information is used to iterate the Fourier ptychographyprogram to update the target image based on the obtained image sequence until the estimation converges. During the updating procedure, the scattering effect can be removed, and the spatial-resolution is improved. Compared with traditional scattering imaging model, the proposed method can perform super-resolution color imaging and descattering under various conditions, and solve the problem of color cases. Furthermore, the proposed method is easy to incorporate into a traditional Fourier Ptychography imaging system to obtain high-fidelity images with better quality and effective detail information. Therefore, the proposed method has the potential to help super-resolution imaging to obtain more practical applications. ? 2024 中國物理學(xué)會 Chinese Physical Society.Affiliations:(1) School of Optoelectronic Engineering, Xidian Univeristy, Xi’an; 710071, China; (2) Xi’an Key Laboratory of Computational Imaging, Xi’an; 710071, China; (3) Key Laboratory of Space Precision Measurement Technology, Chinese Academy of Sciences, Xi’an; 710119, China; (4) Hangzhou Institute of Technology, Xidian University, Hangzhou; 311200, ChinaPublication Year:2024Volume:73Issue:12Article Number:124202DOI Link:10.7498/aps.73.20240268數(shù)據(jù)庫ID（收錄號）:20242816657535 -
Record 88 of
Title:Adaptive location method for film cooling holes based on the design intent of the turbine blade
Author Full Names:Hou, Yaohua(1); Wang, Jing(1); Mei, Jiawei(2); Zhao, Hualong(1)Source Title:International Journal of Advanced Manufacturing TechnologyLanguage:EnglishDocument Type:Journal article (JA)Abstract: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%. ? The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2024.Affiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) Key Laboratory of Vehicle Advanced Manufacturing, Measuring and Control Technology, Ministry of Education, Beijing Jiaotong University, Beijing; 100044, ChinaPublication Year:2024Volume:132Issue:3-4Start Page:1439-1452DOI Link:10.1007/s00170-024-13456-4數(shù)據(jù)庫ID（收錄號）:20241215791556 -
Record 89 of
Title:Error analysis based on a tunable wave plate polarization interferometric imaging spectrometer
Author Full Names:Tang, Feng(1,2); Zhang, Biyun(3); Zhang, Chunmin(1,2); Ma, Zhen(4); Ke, Ke(1,2); Wang, Yanqiang(1,2)Source Title:Applied OpticsLanguage:EnglishDocument Type:Journal article (JA)Abstract:Interference imaging spectroscopy combines modern imaging technology with spectral technology, holding significant importance for object imaging and spectral detection. This article introduces the principle of an adjustable wave plate polarization interferometric imaging spectrometer. The example design specifications are set for an observation wavelength range of 450–780 nm and a maximum resolution of 2 nm at 450 nm, with a 0.5 in detector as the base for calculating the specific dimensions of the Soleil–Babinet compensator. An investigation was conducted on the issues of nonuniform sampling, as well as three types of mechanical errors: flatness, wedge angle tolerance, and optical axis orientation accuracy. Emphasis was placed on discussing the impact of these errors on the instrument’s optical path difference and spectral reconstruction accuracy. This research provides theoretical guidance for the design and engineering of this miniaturized imaging spectrometer. ? 2024 Optica Publishing Group.Affiliations:(1) School of Physics, Xi’an JiaoTong University, Xi’an; 710049, China; (2) Institute of Space Optics, Xi’an JiaoTong University, Xi’an; 710049, China; (3) BA Trading (Guangzhou) Co., Ltd., Guangzhou; 510000, China; (4) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, ChinaPublication Year:2024Volume:63Issue:30Start Page:8016-8026DOI Link:10.1364/AO.538907數(shù)據(jù)庫ID（收錄號）:20244417297008 -
Record 90 of
Title:Hybrid optical-electronic compensation of fiber nonlinearity for long-haul coherent optical transmission
Author Full Names:Tong, Xiaogang(1); Huang, Wei(2); Cao, Weiwei(3); Zhang, Junsheng(1); Zhang, Xiaojuan(1)Source Title:Journal of Optical CommunicationsLanguage:EnglishDocument Type:Article in PressAbstract:From the concepts of the dispersion-folded digital backward propagation (DBP) and optical phase conjugation (OPC), a hybrid optical-electronic nonlinearity-compensation scheme is proposed to enhance the system performance of the dispersion-managed transmission. The computational complexity of the proposed scheme, compared with that of the conventional DBP method, is reduced significantly while the performance penalty is negligible. The compensation efficiency of the proposed scheme has been validated in a 5 (and 9)-channel PM-16QAM system at 256 ? Gbit/s. ? 2024 Walter de Gruyter GmbH, Berlin/Boston 2024.Affiliations:(1) Department of Electronic Engineering, Taiyuan Institute of Technology, Taiyuan, China; (2) Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou, China; (3) Key Laboratory of Ultrafast Photoelectric Diagnostic Technology, Xi'An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, ChinaPublication Year:2024DOI Link:10.1515/joc-2024-0110數(shù)據(jù)庫ID（收錄號）:20242616319208 -
Record 91 of
Title:A 64Gb/s Si-Photonic Micro-Ring Resonator Transceiver with Co-designed CMOS Driver and TIA for WDM Optical-IO
Author Full Names:Ma, Qianli(1,2); Chen, Sikai(1); Xue, Jintao(2,3); Ma, Yingjie(1,2); Gu, Yuean(2); Cheng, Chao(2,3); Chen, Yihan(2); Yin, Haoran(1,2); Li, Guike(1,2); Zhang, Zhao(1,2); Wu, Nanjian(1,2); Li, Ke(4); Wang, Lei(4); Li, Ming(1,2); Xiang, Chao(5); Wang, Binhao(2,3); Qi, Nan(1,2); Liu, Liyuan(1,2)Source Title:2024 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium, BCICTS 2024Language:EnglishDocument Type:Conference article (CA)Conference Title:2024 IEEE BiCMOS and Compound Semiconductor Integrated Circuits and Technology Symposium, BCICTS 2024Conference Date:October 27, 2024 - October 30, 2024Conference Location:Fort Lauderdale, FL, United statesAbstract:This paper presents a hybrid-integrated Silicon Photonic (SiPh) transceiver chipsets for the in-package optical I/O. A dual-segment micro-ring modulator (MRM) and co-designed driver is proposed in the transmitter, where the main and pre-emphasis paths are separately optimized for higher aggregated bandwidth. The driver employs an asymmetric inductive peaking to compensate for MRM non-linearity. The receiver employs a cascaded ring resonator (CRR) to achieve high-Q and wide passband filtering for wavelength division multiplexing (WDM). A high-speed CMOS TIA is co-designed with integrated wavelength tuning. Polarization insensitive optical reception is achieved by the 2 D grating coupler and bidirectional input photodetector. Experimental results show the proposed SiPh transmitter achieves 3.2dB ER at 64Gb/s and could achieve a maximum transmission speed of 70Gb/s. The receiver achieves 64Gb/s speed with 4.5ps RMS jitter at-7 dBm optical input, where the R X bit error rate BER reaches 10-12. ? 2024 IEEE.Affiliations:(1) Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China; (2) University of Chinese Academy of Sciences, Beijing, China; (3) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China; (4) Peng Cheng Laboratory, Shenzhen, China; (5) The University of Hong Kong, Hong Kong, Hong KongPublication Year:2024Start Page:99-102DOI Link:10.1109/BCICTS59662.2024.10745688數(shù)據(jù)庫ID（收錄號）:20245117535892 -
Record 92 of
Title:Short failure localization in advanced package using optoelectronic sampling terahertz time domain reflectometry and deconvolution method
Author Full Names:Liu, Longhai(1,2); Li, Kangrong(3); Yang, Qiao(3); Shang, Yang(4); Xu, Zhen(1); Li, Jining(1); Xu, Degang(1); Yao, Jianquan(1)Source Title:Microelectronics JournalLanguage:EnglishDocument Type:Journal article (JA)Abstract:Failure localization in advanced packaging is a challenging task. Optoelectronic sampling Terahertz time-domain reflectometry (OES THz TDR) employs ultrafast lasers to generate high-frequency THz pulse. The THz pulse is coupled into advanced package trace using radio frequency probe. When there is an open or short failure in the circuit, TDR signal could be captured. Deconvolution processing method was introduced to remove noise from multiple reflections of the remaining circuit. A short failure model with remaining circuit was studied. After deconvolution, the TDR localization accuracy improves from 573 μm to 12 μm, and the correlation coefficient improved from 99.612 % to 99.955 %. Advanced package sample including substrate, C4 bump, interposer, and micro bump was analyzed. By comparing the TDR waveform of short failure sample and references, the short failure is localized inside of the die. By destroying the failure sample and measuring the current-voltage curve, the short failure location is verified. ? 2024 Elsevier LtdAffiliations:(1) Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin; 300072, China; (2) Advantest (China) Co., Ltd., Shanghai; 201203, China; (3) Xi'an Microelectronics Technology Institute, Xi'an; 710065, China; (4) Advantest (Singapore) Pte Ltd., 569059, SingaporePublication Year:2024Volume:151Article Number:106310DOI Link:10.1016/j.mejo.2024.106310數(shù)據(jù)庫ID（收錄號）:20243016761702 -
Record 93 of
Title:Research of underwater 3D imaging based on Single-Slit Streak Tube Imaging Lidar
Author Full Names:Yue, Zelin(1,2,4); Luo, Xiujuan(1,2,4); Fang, Mengyan(1,2,3); Liu, Hui(1,2,4); Chen, Minglai(1,2); Zhao, Jing(1,2,4); Wang, Xing(1,2,3); Ruan, Ping(1,2,4)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:7th Global Intelligent Industry Conference, GIIC 2024Conference Date:March 30, 2024 - April 1, 2024Conference Location:Shenzhen, ChinaConference Sponsor:The Chinese Society for Optical EngineeringAbstract:Compared to traditional underwater cameras, lidar can capture more dimensional information about targets, thereby offering substantial advantages in underwater target detection. The Single-Slit Streak Tube Imaging Lidar (SS-STIL) is a high temporal resolution device designed for 3D precision measurement. It operates on the principle of time-of-flight, recording the 3D information of target as multiple high-precision 2D streak images. These images are then used to reconstruct the target's 3D information through advanced reconstruction algorithms. Existing researches on the imaging quality of Streak Tube Imaging Lidar (STIL) often fall short in thoroughly investigating the impact of water turbidity on imaging quality and particularly lack quantitative measurements of underwater imaging environments. To address the aforementioned issues, we first performed theoretical calculations and simulations of the SS-STIL for imaging targets in both air and underwater environments. Based on these simulation results, we determined the parameters for the main modules of the actual imaging system. We measured the water's attenuation coefficient in the experimental setting using a photometer, quantified five levels of underwater turbidity, and conducted experiments with our SS-STIL under these five different conditions. At an imaging distance of 4.5m and a water attenuation coefficient of 0.51m-1, our SS-STIL system achieved an imaging resolution of 1cm and a spatial resolution of 3cm, which is superior to other existing STIL systems. ? 2024 SPIE.Affiliations:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (2) CAS Key Laboratory of Space Precision Measurement Technology, Xi’an; 710119, China; (3) CAS Key Laboratory of Ultra-fast Photoelectric Diagnostics Technology, Xi’an; 710119, China; (4) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024Volume:13278Article Number:132781GDOI Link:10.1117/12.3032356數(shù)據(jù)庫ID（收錄號）:20244517307145 -
Record 94 of
Title:Nanosecond pulse X-ray emission source based on ultrafast laser modulation
Author Full Names:Li, Yun(1,2); Su, Tong(1); Sheng, Li-Zhi(1); Zhang, Rui-Li(1); Liu, Duo(3); Liu, Yong-An(1); Qiang, Peng-Fei(1); Yang, Xiang-Hui(1); Xu, Ze-Fang(1,2)Source Title:Wuli Xuebao/Acta Physica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:In response to the growing demand for miniaturized ultrafast pulsed X-ray sources in the fields of fundamental science and space applications, we design and develop an ultrafast pulsed X-ray generator based on a laser-modulated light source and a photoelectric cathode. This innovative technology addresses the limitations commonly encountered in traditional X-ray emission devices, such as low repetition rate, insufficient time stability, and suboptimal pulse characteristics. Our effort is to study and develop the ultrafast modulation control module for the pulsed X-ray generator. This effort results in achieving high levels of time accuracy and stability in ultrafast time-varying photon signals. Moreover, we successfully generate nanosecond pulsed X-rays by using a laser-controlled light source. Theoretically, we establish a comprehensive time response model for the pulsed X-ray generator in response to short pulses. This includes a thorough analysis of the time characteristics of the emitted pulsed X-rays in the time domain. Experimentally, we conduct a series of tests related to various time-related parameters of the laser-controlled light source. Additionally, we design and implemente an experimental test system for assessing the time characteristics of pulsed X-rays, by using an ultrafast scintillation detector. The experimental results clearly demonstrate that our pulsed X-ray generator achieves impressive capabilities, including high repetition rates (12.5 MHz), ultrafast pulses (4 ns), and exceptional time stability (400 ps) in X-ray emission. These results closely align with our established theoretical model. Compared with traditional modulation techniques, our system exhibits significant improvement in pulse time parameters, thereby greatly expanding its potential applications. This research provides a valuable insight into achieving ultra-high time stability and ultrafast pulsed X-ray emission sources. These advances will further enhance the capabilities of X-ray technology for scientific research and space applications. ? 2024 Chinese Physical Society.Affiliations:(1) State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Xi’an; 710119, China; (2) School of Optoelectronics, University of Chinese Academy of Sciences, Beijing; 100049, China; (3) School of Mathematics and Physics, Handan University, Handan; 056005, ChinaPublication Year:2024Volume:73Issue:4Article Number:040701DOI Link:10.7498/aps.73.20231505數(shù)據(jù)庫ID（收錄號）:20241515855160 -
Record 95 of
Title:Overview of Optical Interferometer Payloads for Detecting Wind Fields in Middle and Upper Atmosphere (Invited)
Author Full Names:Han, Bin(1); Feng, Yutao(1); Wang, Jingsong(2); Hu, Xiuqing(2); Zong, Weiguo(2); Xu, Na(2); Huang, Cong(2); Mao, Tian(2); Hao, Xiongbo(1); Li, Yong(1)Source Title:Guangxue Xuebao/Acta Optica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:Significance The wind field is an important parameter characterizing the dynamic characteristics of the Earth’s mid-upper atmosphere system. It is also necessary basic data for operational work and scientific research in the fields of meteorological forecasting，space weather，and climatology. Passive optical remote sensing based on optical interferometer satellite payloads is a main technical method of obtaining wind field data in the middle and upper atmosphere. Space-borne interferometer payloads have been developed internationally for the detection of wind fields in the middle and upper atmosphere for more than half a century. There have been in-depth studies on the detection mechanism of wind fields in the middle and upper atmosphere，the physical characteristics of detection sources，the principles and data inversion of various wind measurement interferometers， satellite observation modes， atmospheric scattering， and radiation transmission. A complete theoretical system has been formed. Through the accumulation of global wind field observation data from payloads such as HRDI，WINDII，and MIGHTI，considerable basic observation data have been obtained for horizontal atmospheric wind field models and atmospheric temperature models，and the study of the dynamics and thermodynamic properties of the Earth’s atmosphere has been promoted. Many research results have been produced in the fields of space weather forecasting， atmospheric dynamics， atmospheric composition changes， and momentum and energy transport between the upper and lower atmosphere. However，the World Meteorological Organization clearly states that global wind field detection is the key to the detection of Earth’s atmosphere. The lack of direct global wind field measurement data remains one of the main shortcomings of the global observation system. The detection capability of wind fields in the middle and upper atmosphere is insufficient，and detection data are scarce，which do not satisfy the current requirements of atmospheric dynamics research，medium-term and long-term weather forecasting， space weather warning， and climatology research. China’s research on wind measurement interferometer technology started late and particularly lacked systematic theoretical research on space-borne interferometers for wind field detection. Since the 1970s，five generations of space-borne interferometer payloads for wind measurements have been launched internationally；however，China still lacks a global satellite remote sensing payload for measuring wind fields in the middle and upper atmosphere. To promote the optical technologies of space-borne passive remote sensing for atmospheric wind fields measurement，it is necessary to summarize and discuss the progress made in existing research and future development trends to provide a reference for the development of future optical interferometer payloads for atmospheric wind field measurement. Progress This paper summarizes the research status and progress of the satellite-borne wind interferometer payloads that have been successfully launched internationally，including three technical systems：the Fabry-Pérot interferometer（FPI），wide-angle Michelson interferometer，and Doppler asymmetric spatial heterodyne interferometer. The technical principles of wind field detection，the overall technical scheme of the payload，and the application of observation data output are introduced. In the order of launch time，the FPI payloads on OGO-6 and the DE-2，HRDI，TIDI，WNIDII，and MIGHTI payloads are introduced. The research goal of the FPI on OGO-6 is to retrieve the temperature of the mesospheric atmosphere by measuring the line shape and line width of the 630-nm airglow emission spectrum of the red oxygen atomic line. The instrument uses a limb observation mode to observe the 630-nm spectrum of the red oxygen atomic line at a height of 250 km in the emission layer. The atmospheric temperature within the height range of 200?300 km is retrieved from the line width of the spectrum，with a measurement error of 15 K. No wind field data have been reported so far. DE-2 uses a highly stable single-standard FPI to observe the atmosphere with a limb observation mode and utilizes spectral and spatial scanning data to measure the temperature，tangential wind field，and metastable atomic O（1S），O（1D），O+（2P）concentration data in the middle atmosphere. Through the measurement of multiple airglow emission lines in the visible and near-infrared bands，considerable global wind field data are directly obtained，which are compared and validated with the observation results of ground-based equipment and thermal atmospheric environment models. The DE-2 FPI offers important contributions to the study of thermal atmospheric characteristics. The HRDI measures the wind field，temperature，and volume emission rate in the mesosphere and lower thermosphere，as well as the cloud top height，effective albedo，aerosol phase function，and scattering coefficient in the stratosphere. The HRDI is an FPI consisting of three series of planar etalons，which can be adjusted for specific wavelengths by changing the spacing between two etalons using piezoelectric ceramics. During its on-orbit operation，the HRDI measures the wind field vectors in the stratosphere at 10?40 km，the mesosphere and lower thermosphere at 50?120 km during the day，and the lower thermosphere at 95 km during the night. The peak accuracy of wind speed measurement in the mesosphere is up to 5 m/s，but there are limited public data below 60 km in altitude. The TIDI is the first instrument to simultaneously detect wind fields in four directions，with a speed direction of ±45° and ±135° relative to the satellite. It uses a circular line imaging optical system（CLIO）and charge-coupled device（CCD）for detection and can operate during daytime，nighttime，and aurora conditions. Through data inversion，it can obtain global wind field vectors and temperature fields，as well as dynamic and thermodynamic parameters such as gravity waves，composition density， airglow， and aurora emissivity. The instrument design achieves a peak accuracy of 3 m/s for mesospheric wind speeds under optimal observation conditions，and a measurement accuracy of 15 m/s for thermospheric wind speeds. WINDII detects the wind speed ，temperature ，pressure ，and airglow emissivity in the middle and upper atmosphere （80?300 km）to study the physical motion processes of the stratosphere，mesosphere，and lower thermosphere and to study atmospheric tides，large planetary-scale structures，and enhanced wind fields generated by aurora. WINDII operated in orbit for 12 years and ceased operation in October 2003，obtaining more than 23 million images and providing rich data for global atmospheric research. MIGHTI employs the limb observation mode to measure the global distribution of atmospheric wind fields and temperatures. It measures the green and red oxygen atomic lines at 557.7 nm and 630 nm，respectively，as the target spectral lines to retrieve wind speeds，and the oxygen A-band near 762 nm as the target spectral line to retrieve atmospheric temperatures. The results are in good agreement with ground-based FPI and meteor radar wind field detection data，thus providing dynamic and thermodynamic basic observation data for the study of strong disturbances in the ionosphere，energy and momentum transfer between the lower atmosphere and outer space，and the effects of solar wind and magnetic fields on the interaction mechanism of atmospheric space systems. A detailed parameter comparison is presented in Table 2. Conclusions and Prospects In general，the capability of space-borne atmospheric wind field detection based on passive optical remote sensing still has problems such as discontinuous altitude profile coverage，incomplete local coverage of wind fields in the middle and upper atmosphere，and limited spatial resolution of wind field data in the upper atmosphere. This paper discussed the future development trends of optical interferometer payloads for middle- and upper-atmosphere wind field detection，providing a reference for the development and planning of atmospheric dynamic characteristic detection payloads in China’s new generation of the FY meteorological satellite system. ? 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) Laboratory of Spectral Imaging Technology, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Shaanxi, Xi’an; 710119, China; (2) Key Laboratory of Space Weather, China Meteorological Administration, National Satellite Meteorological Center, National Center for Space Weather, Beijing; 100081, ChinaPublication Year:2024Volume:44Issue:18Article Number:1800008DOI Link:10.3788/AOS240679數(shù)據(jù)庫ID（收錄號）:20244017127299 -
Record 96 of
Title:Key assembling and alignment technology of laser communication opto-mechanical system
Author Full Names:Cao, Mingqiang(1); Lei, Yu(1); Shi, Yuanyuan(1); Ren, Wangtao(1); Liu, Yong(1); Li, Xiaoyan(1); Hou, Xiaohua(1)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:2023 Advanced Fiber Laser Conference, AFL 2023Conference Date:November 10, 2023 - November 12, 2023Conference Location:Shenzhen, ChinaConference Sponsor:Chinese Society for Optical EngineeringAbstract:The optical mechanical system of laser communication has the characteristics of compact structure, highly integration, and multi optical axes integration. The consistency between transmission and reception, divergence angle, and wavefront of the optical telescope of the system are very important indicators. In response to the above difficulties and characteristics, this article conducts research on computer-Aided adjustment, fiber optic coupling, and transceiver consistency testing. Currently, coaxial and off-Axis optical telescope aligning technologies, high-precision fiber optic coupling debugging technology, and turntable linked space optical path transceiver consistency assembling technology have been formed, which can achieve the target requirements of transceiver consistency of 3μrad and system divergence angle of 30μrad. ? COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.Affiliations:(1) Xi an Institute of Optics and Precision Machinery, CAS No.17, Xinxi Avenue, High-Tech Zone,Shaanxi, Xi'an, ChinaPublication Year:2024Volume:13104Article Number:1310474DOI Link:10.1117/12.3024118數(shù)據(jù)庫ID（收錄號）:20241816027441