2024
2024
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Record 337 of
Title:Research and Design of Wavefront Performance of Reflective Laser Beam Expander Under Thermal Environment
Author Full Names:Wenjie, Fan(1); Zhaohui, Li(1); Yong, Liu(1); Huan, Zhang(1); Shasha, Yin(1)Source Title:Zhongguo Jiguang/Chinese Journal of LasersLanguage:ChineseDocument Type:Journal article (JA)Abstract:Objective The performance of a beam expander, as a key component for improving laser divergence angle in high-energy laser emission systems, directly affects the collimation and beam quality of laser emitted by the system. However, when all-weather operation is required, changes in the ambient temperature affect the wavefront stability of the internal beam expander in high-energy laser emission systems. The conventional design concept of passive thermal compensation is to compensate for the thermal displacement of optical surfaces via the reverse expansion deformation of two different material support structures in a thermal environment. However, the structural form of supporting structures connected by different materials can generate thermal stress in the thermal environment, thus resulting in the uncontrollable deformation of the structure and increasing the design risk of the system. In this study, a new design method for injection thermal compensation is proposed, which compensates for thermal deformation via the flexible force of the silicone-rubber layer. This method offers good thermal compensation and avoids the irregular deformation and stress generation of the support structure during thermal compensation. We hope that our basic research can provide new ideas and data support for the thermal compensation design of coaxial reflective systems. Methods In this study, a laser-beam expander was regarded as the research object. First, the effect of temperature change on the wavefront root mean square (RMS) and Zernike fringe coefficients of the beam expander in the temperature range of 0 ℃ to 40 ℃ was investigated via integrated optomechanical analysis. Subsequently, a temperature test platform was established, and the accuracy of the integrated simulation results was discussed using wavefront test data from 0 ℃ to 40 ℃ . Next, to accommodate the significant changes in the power of the system during temperature rise and fall, a method for designing the thermal compensation of the injection rubber was proposed. The relationship between the thickness and diameter of the silicone rubber layer and the thermal-compensation effect was investigated via integrated optomechanical analysis, and the suitable thickness of the silicone-rubber layer for the thermal compensation of laser-beam expanders was determined. Finally, experimental testing and simulation analysis were performed, which verified that the laser-beam expander designed with thermal compensation presents favorable thermal-environment adaptability and satisfies the usage requirements. Results and Discussions The simulation analysis results are consistent with the experimental test results (Fig. 11), thus indicating that the first-order astigmatism and coma of the system vary marginally within 0 ℃ to 40 ℃, and that the power change caused by the change in the distance between the primary and secondary mirrors contributes primarily to the wavefront increase of the system (Fig. 7 and Fig. 8). The analysis on the thermal compensation of the beam expander shows that both the thickness and diameter of the rubber layer affect thermal compensation, and that the effect of the rubber-layer thickness on thermal compensation is more significant. The thickness of the silicone-rubber layer ranges from 0.15 mm to 0.25 mm. As the thickness increases, the system wavefront RMS and power decrease. When the thickness of the adhesive layer exceeds 0.25 mm, overcompensation occurs, and the power changes from positive to negative (or from negative to positive), whereas the RMS of the system increases with the rubberlayer thickness (Fig. 12). By considering thermal compensation in the design of the laser-beam expander, the wavefront RMS and beam quality equivalent β factors at 0 ℃, 20 ℃, and 40 ℃ are 0.373λ@633 nm, 0.0319λ@633 nm, 0.397λ@633 nm and 1.385, 1.331, and 1.402, respectively, thus demonstrating the good thermal stability of the beam expander (Fig. 14). Conclusions In the present study, the wavefront variation of laser-beam expanders in the temperature range of 0 ℃ to 40 ℃ is revealed. Because the power of beam expanders is sensitive to temperature change, a new passive thermal-compensation design method suitable for coaxial reflective optical systems is proposed. The compensation design involves injecting silicone rubber on the back of optical components to compensate for the change in optical spacing with the expansion or contraction flexible force of the silicone-rubber layer in the thermal environment. It can effectively reduce the occurrence of uncontrollable thermal stress and deformation in the thermal environment caused by the connection of different material support structures in conventional, passive, mechanical, non-thermal designs. After considering thermal compensation, the wavefront variation of the laser-beam expander within the temperature range of 0 ℃ to 40 ℃ remain less than 0.0078λ@633 nm. Additionally, β does not exceed 0.071, which signifies that the usage requirements are satisfied. © 2024 Science Press. All rights reserved.Affiliations:(1) Precision Metrology Research Center, Xi’an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shaanxi, Xi’an; 710068, ChinaPublication Year:2024Volume:51Issue:14Article Number:1401004DOI Link:10.3788/CJL240531数据库ID（收录号）:20243116794044 -
Record 338 of
Title:Dual-complexities based on straightforward neighborhood pixel prediction in pixel-value-ordering framework for reversible data hiding
Author Full Names:Li, Zijing(1); Liao, Xuewen(1); Fan, Guojun(1); Zhang, Xiaoran(1); Pan, Zhibin(1,2,3)Source Title:DisplaysLanguage:EnglishDocument Type:Journal article (JA)Abstract:PVO-based schemes are the widely-used reversible data hiding (RDH) techniques. Benefiting from the good prediction performance, the stego-image can have a high quality. However, the complexity metric of PVO is still not good enough. The two main limitations are: the block-based context pixels are not highly correlated with the predicted pixel, and the fluctuation-based complexity calculation methods cannot comprehensively represent the real prediction result. Unlike the existing complexity metrics, we consider this problem from a novel viewpoint of neighborhood pixel prediction (NPP), i.e., using the prediction pixel to predict the unmodified neighborhood pixels of a predicted pixel. The neighborhood pixels are more reliable than the context pixels and the generated neighborhood prediction-errors (NPEs) are utilized to represent the real prediction-error (RPE). Two new features are extracted from NPEs as Dual-complexities to determine the embedding order. Experimental results indicate the quality of the stego-image can be improved significantly by using our proposed Dual-complexities in the related PVO-based schemes, and it can be directly extended to other schemes in PVO framework as well. © 2024 Elsevier B.V.Affiliations:(1) Faculty of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an; 710049, China; (2) State Key Laboratory of Transient Optics and Photonics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) Research Institute of Xi'an Jiaotong University, Zhejiang; 311215, ChinaPublication Year:2024Volume:84Article Number:102749DOI Link:10.1016/j.displa.2024.102749数据库ID（收录号）:20242316214170 -
Record 339 of
Title:Research on Omnidirectional Laser Grid Relative Navigation Technology
Author Full Names:Ma, Jun(1); Ding, Wanqing(1); Li, Chengming(1); Wang, Hu(2); Chen, Long(1)Source Title:Guangzi Xuebao/Acta Photonica SinicaLanguage:ChineseDocument Type:Journal article (JA)Abstract:Relative navigation between aircraft formations plays a crucial role in modern military operations, particularly when it comes to command decisions, coordination, and situational awareness during collaborative combat scenarios. The ability for aircraft to maintain precise formation flying ensures operational effectiveness, enhances tactical flexibility, and enables coordinated maneuvers, all of which are vital in dynamic combat environments. However, in environments with satellite denial, strong electromagnetic interference, and radio silence, traditional global satellite navigation and data link methods cannot accurately measure the relative positions between aircraft formations, highlighting the urgent need for innovative high-precision navigation technologies. Aiming at the problem that global satellite navigation and data link navigation can not accurately measure the relative position of formation aircraft under the environment of satellite rejection, strong electromagnetic countermeasures and radio silence, this paper proposes an omnidirectional laser grid relative navigation technology, which uses high-power laser as the light source. The laser beam is shaped and divided by a precision optical system to form a laser sector with specific geometry. A high-precision rotating platform is used to generate an omnidirectional laser grid field in the circumferential direction of the aircraft. Through high-precision grid division and coding of the circumferential angle of the aircraft, combined with the specific geometric structure of the laser grid field, high-precision spatial angle positioning of the aircraft is realized. Based on the principle of two-way ranging, the laser grid field emitted by the formation of the aircraft contains the time stamp of the information round trip. The time information is obtained by using the high-sensitivity photodetector and the precision optical system to detect and decode the laser signal, so as to realize the far oblique distance measurement between the formation aircraft and the omnidirectional relative navigation of the formation aircraft. In order to verify the angle measurement and ranging performance of the proposed omnidirectional laser grid relative navigation technology, an omnidirectional laser grid relative navigation test system was built, which included a computer (omnidirectional laser grid relative navigation host computer), a prototype of omnidirectional laser grid navigation(leader, wingman)and a total station. The spatial angle and precise oblique distance of the long plane and the wingman were obtained by using the total station, and the results were compared with those obtained by the omnidirectional laser grid relative navigation system. Four different locations were randomly selected, and the average values of azimuth, height and distance of 100 groups of data were taken as the measured data of the location, and compared with the true value. The experimental results show that the maximum error of azimuth angle, height angle and distance is 0.01°, 0.03° and 0.57 m respectively. To verify the omnidirectional characteristics of the omnidirectional laser grid relative navigation technology, 18 position points were selected in the circumference of the long plane to carry out the azimuth test of the wingman relative to the long plane. The curve trend was consistent with the position of the wingman. The minimum azimuth angle was 1.611° and the maximum azimuth angle was 356.985°. The feasibility of the proposed technology is fully verified. The proposed technology can solve the relative navigation of aircraft formation in the environment of radio silence and radio frequency rejection, which is of significance for the accurate navigation of aircraft formation in such environment. At present, only the relative navigation experiment of a single wingman has been carried out, and the relative navigation performance of multiple wingmen needs to be further verified in the future. © 2024 Chinese Optical Society. All rights reserved.Affiliations:(1) School of Defence Science and Technology, Xi'an Technological University, Xi'an; 710021, China; (2) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710019, ChinaPublication Year:2024Volume:53Issue:11Article Number:1112003DOI Link:10.3788/gzxb20245311.1112003数据库ID（收录号）:20245117548520 -
Record 340 of
Title:Structural vibration frequency monitoring based on event camera
Author Full Names:Lv, Yuanyuan(1,2,3); Zhou, Liang(1,3); Liu, Zhaohui(1,3); Zhang, Haiyang(1,2,3)Source Title:Measurement Science and TechnologyLanguage:EnglishDocument Type:Journal article (JA)Abstract:Compared with traditional cameras, event cameras (ECs) have the significant advantages of high temporal resolution, low data redundancy, and microsecond delay, which are beneficial in structural monitoring to extract the dense response of structures in both spatial and temporal dimensions. In this paper, the vibration frequency detection method based on ECs is studied. This study investigates vibration frequency detection methods based on ECs, and proposes two algorithms for vibration frequency detection based on event streams: marker tracking and event count. Experimental verification is conducted through forced vibration experiments. The results indicate that the event count method achieves high-precision measurement of vibration frequencies in the range of 10-190 Hz for different vibration scales, with a maximum relative error of 1% and an average relative error of 0.673%. The marker tracking method demonstrates a maximum relative error of 1.43% and an average relative error of 0.575% in frequency measurement for large-amplitude vibrations. However, as the amplitude decreases, the frequency measurement error increases. When the amplitude is less than 3 pixels, the frequency measurement error exceeds 30%, rendering the measurement results unreliable. This research provides technical support for high-precision structural vibration frequency monitoring and further expands the application of ECs in structural monitoring. © 2024 IOP Publishing Ltd.Affiliations:(1) Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, No. l7 Xinxi Road, Xi’an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, China; (3) Key Laboratory of Space Precision Measurement Technology, Chinese Academy of Sciences, No. l7, Xinxi Road, Xi’an; 710119, ChinaPublication Year:2024Volume:35Issue:8Article Number:085007DOI Link:10.1088/1361-6501/ad42bf数据库ID（收录号）:20242116106596 -
Record 341 of
Title:Genetic Algorithm-Based Optimization of Arrhythmia Classification Model
Author Full Names:Zhao, Jingpu(1); Feng, Zhengyang(1); Sun, Yiding(2); Xing, Runqiang(3); Hu, Kai(1)Source Title:2024 7th International Conference on Advanced Algorithms and Control Engineering, ICAACE 2024Language:EnglishDocument Type:Conference article (CA)Conference Title:7th International Conference on Advanced Algorithms and Control Engineering, ICAACE 2024Conference Date:March 1, 2024 - March 3, 2024Conference Location:Hybrid, Shanghai, ChinaConference Sponsor:IEEEAbstract:The heart rate typically aligns with the electrical events within the heart, and an electrocardiogram (ECG) captures the electronic signals from the heart as they manifest on the surface of the body. By classifying and predicting the heart rate segments specifically, patients can be resuscitated in time. Currently, most of the commercially available problems on heart rate detection use machine learning and deep learning for automatic classification, and algorithms in related directions are slightly inadequate, resulting in still low accuracy and performance of classification and prediction models in specific situations. In this study, an arrhythmia classification algorithm model is developed for specific six heart rate risk classes by analyzing ECG data. A pruned and optimized decision tree method was first used to determine the danger classes of ECG data to attain real-time assessment and alert for arrhythmias. Then the model was optimized by using genetic algorithm, and by iterating the model parameters and selecting better parameter combinations, the final model accuracy improved by about 6%, the recall rate was increased by 13%, and the F1 value was increased by 16.8%, further improving the comprehensive performance of the model, which will provide reference for subsequent research in related directions and further promote the progress of research in related fields such as heart disease patient monitoring. © 2024 IEEE.Affiliations:(1) Xi' An Technological University, Xi'an, China; (2) Xi'an Jiaotong University, Xi'an, China; (3) Chinese Academy Of Sciences, Xi'an Institute Of Optics And Precision Mechanics, Xi'an, ChinaPublication Year:2024Start Page:122-127DOI Link:10.1109/ICAACE61206.2024.10549254数据库ID（收录号）:20242716656313 -
Record 342 of
Title:Swin-CDSA: The Semantic Segmentation of Remote Sensing Images Based on Cascaded Depthwise Convolution and Spatial Attention Mechanism
Author Full Names:Kang, Yuhan(1); Ji, Jian(1); Xu, Hekai(1); Yang, Yong(1); Chen, Peng(1); Zhao, Hui(2)Source Title:IEEE Geoscience and Remote Sensing LettersLanguage:EnglishDocument Type:Journal article (JA)Abstract:As an important task in remote sensing image processing, semantic segmentation of remote sensing images has broad application prospects in many fields such as disaster warning and rescue, environmental protection, and road planning. Research on semantic segmentation of remote sensing images based on deep learning has made some progress, but there are still problems such as poor perception of small object features, loss of detailed information in deep feature extraction, and imprecise segmentation contours of small objects. To this end, we propose a new remote sensing semantic segmentation model Swin-CDSA, which copes these problems to some extent by designing cascaded deep convolutional modules (CDCMs) and spatial attention mechanisms (SAMs). CDCM extracts multiscale features by using multilayer convolutions with different layers but parallel fixed small-sized kernels, while SAM supplements the model's understanding of local and global information through a dual attention mechanism. We conducted experiments on the Potsdam and LoveDA datasets and achieved good results. © 2024 IEEE.Affiliations:(1) Xidian University, School of Computer Science and Technology, Shaanxi, Xi'an; 710071, China; (2) Xi'An Institute of Optics and Precision Mechanics, CAS, Shaanxi, Xi'an; 710119, ChinaPublication Year:2024Volume:21Article Number:3003405DOI Link:10.1109/LGRS.2024.3431638数据库ID（收录号）:20243116773801 -
Record 343 of
Title:Broadband Mid-infrared Kerr Comb Generation in Suspended AlGaAs Microresonators
Author Full Names:Zhang, Yuqian(1); Sun, Qibing(2,3); Xiong, Bing(1); Wang, Jian(1); Hao, Zhibiao(1); Wang, Lai(1); Han, Yanjun(1); Li, Hongtao(1); Can, Lin(1); Luo, Yi(1); Wang, Leiran(2,3); Zhang, Wenfu(2,3); Sun, Changzheng(1)Source Title:16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024Language:EnglishDocument Type:Conference article (CA)Conference Title:16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024Conference Date:August 4, 2024 - August 9, 2024Conference Location:Incheon, Korea, Republic ofAbstract:Suspended AlGaAs microring resonator is formed by optimized plasma dry-etching and surface treatment. Mid-infrared Kerr comb generation covering from 1250 nm to 5450 nm is demonstrated with a pump at 2.7 μm. © 2024 IEEE.Affiliations:(1) Beijing National Research Centre for Information Science and Technology (BNRist), Tsinghua University, Department of Electronic Engineering, Beijing; 100084, China; (2) State Key Laboratory of Transient Optics and Photonics, Xi' An Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (3) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024DOI Link:10.1109/CLEO-PR60912.2024.10676524数据库ID（收录号）:20244217212834 -
Record 344 of
Title:Low noise carrier switchable microwave linear frequency modulation source based on external modulation method
Author Full Names:Liu, JinHui(1,2); Li, Dongjian(1); Gao, Cunxiao(1); Hu, Yu(1,2); Hao, Zhenhua(1,2); Chang, Jiansheng(1)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:15th International Conference on Information Optics and Photonics, CIOP 2024Conference Date:August 11, 2024 - August 15, 2024Conference Location:Xi'an, ChinaAbstract:This paper proposes a scheme for generating microwave linear frequency modulation signals based on electro-optic external modulation. After electro-optic modulation, a single-frequency optical carrier signal generates a series of sidebands. By beating the sideband signal with a reference signal, a single-frequency microwave signal with a fixed carrier frequency can be generated. By replacing the modulation frequency with a sweep signal with a controllable frequency variation range and using a mode-locked pulse light as the carrier wave, a low-noise linear frequency modulation microwave signal output with switchable carrier frequency can be achieved. Through experiments, the carrier frequencies of the output signals reached 1.07 GHz and 5.35 GHz, the phase noise of the signals was lower than -101 dBc/Hz@10 kHz, and the signal-to-noise ratio was higher than 27 dB. The experimental results show that high-performance linear frequency modulation microwave signal output with different carrier frequencies, low noise, and stable phase relationship can be achieved. © 2024 SPIE.Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, China; (2) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024Volume:13418Article Number:134180LDOI Link:10.1117/12.3045607数据库ID（收录号）:20245217595525 -
Record 345 of
Title:Efficient generation of broadband photon pairs in shallow-etched lithium niobate nanowaveguide
Author Full Names:Fang, Xiao-Xu(1,2); Wang, Leiran(3,4); Lu, He(1,2)Source Title:arXivLanguage:EnglishDocument Type:Preprint (PP)Abstract:We design and fabricate shallow-etched periodically poled lithium niobate waveguide to realize highly-efficient broadband spontaneous parametric down-conversion (SPDC) on nanophotonic chip. The shallow-etched waveguide is capable to tolerate the non-uniformities of waveguide width induced by fabrication imperfections, enabling generation of photon pairs with high count rate and bandwidth. We demonstrate photon-pair generation with a high brightness of 11.7 GHz/mW and bandwidth of 22 THz, in a 5.7-mm-long PPLN waveguide. The generated photon pairs exhibit strong temporal correlation with a coincidence-to-accidental ratio up to 16262±850. Our results confirm the feasibility of shallow etching in fabrication of efficient SPDC device on platform of lithium niobate on insulator, and benefit quantum information processing with broadband photon source. © 2024, CC BY.Affiliations:(1) School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan; 250100, China; (2) Shenzhen Research Institute, Shandong University, Shenzhen; 518057, China; (3) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an; 710119, China; (4) University of Chinese Academy of Sciences, Beijing; 100049, ChinaPublication Year:2024DOI Link:10.48550/arXiv.2406.17439数据库ID（收录号）:20240276748 -
Record 346 of
Title:Optical intensity-gradient torque due to chiral multipole interplay
Author Full Names:Wen, Jiquan(1,2); Chen, Huajin(2,3,4); Zheng, Hongxia(2,3,4); Xu, Xiaohao(5); Yan, Shaohui(5); Yao, Baoli(5); Lin, Zhifang(3,6)Source Title:arXivLanguage:EnglishDocument Type:Preprint (PP)Abstract:Owing to the ubiquity and easy-to-shape property of optical intensity, the intensity gradient force of light has been most spectacularly exploited in optical manipulation of small particles. Manifesting the intensity gradient as an optical torque to spin particles is of great fascination on both fundamental and practical sides but remains elusive. Here, we uncover the existence of the optical intensity-gradient torque in the interaction of light with chiral particles. Such a new type of torque derives from the interplay between chirality induced multipoles, which switches its direction for particles with opposite chirality. We show that this torque can be directly detected by a simple standing wave field, created with the interference of two counterpropagating plane-like waves. Our work offers a unique route to achieve rotational control of matter by tailoring the field intensity of Maxwell waves. It also establishes a framework that maps a remarkable connection among the optical forces and torques, across chiral to nonchiral. Copyright © 2024, The Authors. All rights reserved.Affiliations:(1) School of Automation, Guangxi University of Science and Technology, Guangxi, Liuzhou; 545006, China; (2) School of Electronic Engineering, Guangxi University of Science and Technology, Guangxi, Liuzhou; 545006, China; (3) State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai; 200433, China; (4) Guangxi Key Laboratory of Multidimensional Information Fusion for Intelligent Vehicles, Guangxi, Liuzhou; 545006, China; (5) State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'An; 710119, China; (6) Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing; 210093, ChinaPublication Year:2024DOI Link:10.48550/arXiv.2409.11924数据库ID（收录号）:20240409682 -
Record 347 of
Title:A truncated test scheme design method for success-failure in-orbit tests
Author Full Names:Ding, Wenzhe(1,2); Bai, Xiang(1); Wang, Qingwei(1); Long, Fang(1); Li, Hailin(1); Wu, Zhengrong(1); Liu, Jian(1); Yao, Huisheng(1); Yang, Hong(1)Source Title:Reliability Engineering and System SafetyLanguage:EnglishDocument Type:Journal article (JA)Abstract:Based on the success-failure test feature of in-orbit tests (IOTs) for typical space equipment, this paper presents a method for designing a truncated test scheme for success-failure in-orbit tests. With this method, a small upper boundary of the sample size for the IOT verification test can be obtained before the test starts. The method introduces the truncated Bayes-sequential mesh test (SMT) method into the design of the IOT verification test scheme and greatly compresses the continuous test area by incorporating optimization theory, resulting in a smaller upper limit of the IOT sample size. First, this paper derives a specific calculation formula for the Bayes-SMT critical line. Second, the Markov chain model is adopted to calculate the occurrence probabilities of each acceptance and rejection point through state transition. Finally, an optimal truncated test optimization algorithm based on the augmented lagrangian genetic algorithm is proposed. Simulation tests show that, compared with the classical single sampling method, the truncated sequential probability ratio test method, the truncated SMT method, and the truncated Bayes-SMT method based on step-by-step calculation, the method presented in this paper can be used to obtain a sequential test scheme with smaller truncated sample size. © 2023Affiliations:(1) Beijing Institute of Tracking and Telecommunications Technology, Beijing, 100096, China; (2) Xi'an Institute of Optics and Precision Mechanics of CAS, Xi'an; 710119, ChinaPublication Year:2024Volume:243Article Number:109782DOI Link:10.1016/j.ress.2023.109782数据库ID（收录号）:20234715092999 -
Record 348 of
Title:A Method Suitable for Cross Calibration of UAV Hyperspectral Remote Sensors
Author Full Names:Li, Haiwei(1); Song, Liyao(2); Wang, Shuang(1); Zhang, Hao(3); Zhang, Wenjuan(3); Zhao, Yi(1); Huang, Zhuo(1)Source Title:Proceedings of SPIE - The International Society for Optical EngineeringLanguage:EnglishDocument Type:Conference article (CA)Conference Title:2024 Applied Optics and Photonics China: Optical Spectroscopy and Applications, AOPC 2024Conference Date:July 23, 2024 - July 26, 2024Conference Location:Beijing, ChinaConference Sponsor:Chinese Society for Optical Engineering (CSOE)Abstract:High-precision radiometric calibration is the basis for quantitative applications of hyperspectral remote sensing. Cross-calibration facilitates the cross-comparison and radiation reference transfer between multi-source hyperspectral equipment and normalizes different remote sensors to a common radiometric baseline. In the collaborative use of different unmanned aerial vehicle (UAV) hyperspectral observations, cross-calibration helps to eliminate the differences in the radiometric and spectral scales of the multi-source remote sensors, improve the radiometric quality and interpretation consistency of the imaging from different remote sensors. However, a significant portion of the error in cross-calibration between UAV hyperspectral instruments using radiation transfer modeling comes from the assumption of aerosol type. When using the irradiance method for calculations, it is important to consider the case that the uplink radiation transfer from the UAV remote sensors passes through only a portion of the atmosphere. Therefore, cross-calibration is necessary to improve the radiation transfer model with its own characteristics. In this paper, we propose the cross-calibration method for UAV hyperspectral to address the above problems. A full set of data such as multi-gray level target images, atmospheric aerosol, water vapor content data, etc. are collected in our experiment. The method improves the traditional irradiance calibration method by combining the measured atmospheric diffuse-to-global ratio, and effectively reduces the error caused by the aerosol assumption by taking into account the special characteristics of the uplink radiation transmission path of the UAV. At the same time, considering that it is difficult to satisfy the need of cross-calibration of the whole response interval by using a single reflectance feature, the experiment adopts six kinds of targets with different gray levels for cross-calibration. Finally, the accuracy and impact of different response intervals are analyzed. The results demonstrate that the method proposed in this paper can ensure the cross-calibration accuracy more reliably, especially when the aerosol type is difficult to be determined, and it is very suitable for cross-radiometric calibration between UAV sensors. © 2024 SPIE. All rights reserved.Affiliations:(1) Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an; 710119, China; (2) Xi'an Technological University, Xi'an; 710021, China; (3) Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing; 100094, ChinaPublication Year:2024Volume:13494Article Number:134940CDOI Link:10.1117/12.3048137数据库ID（收录号）:20250117633254