2024
2024
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Record 73 of
Title:Automatic detection of face mask wearing based on polarization imaging
Author Full Names:Li, Bosong; Li, Yahong; Li, Kexian; Fu, Yuegang; Ouyang, Mingzhao; Jia, WentaoSource Title:OPTICS EXPRESSLanguage:EnglishDocument Type:ArticleAbstract:Amidst the global health crisis sparked by the coronavirus pandemic, the proliferation of respiratory illnesses has captured worldwide attention. An increasing number of individuals wear masks to mitigate the risk of viral transmission. This trend has posed a critical challenge for the development of automatic face mask wearing detection systems. In response, this paper proposed what we believe is a novel face mask wearing detection framework DOLP-YOLOv5, which innovatively employs polarization imaging to enhance the detection of face mask by leveraging the unique characteristics of mask surfaces. For extracting essential semantic details of masks and diminish the impact of background noise, the lightweight shuffle attention (SA) mechanism is integrated in the backbone. Further, a Content-Aware Bidirectional Feature Pyramid Network (CA-BiFPN) is applied for feature fusion, sufficiently integrating the information at each stage and improving the ability of the feature presentation. Moreover, Focal-EIoU loss is utilized for the bounding box regression to improve the accuracy and efficiency of detection. Benchmark evaluation is performed on the self-constructed polarization face mask (PFM) dataset compared with five other mainstream algorithms. The mAP50-95 of DOLP-YOLOv5 reached 63.5%, with 3.08% and 4.44% improvements over the YOLOv8s and YOLOv9s, and achieved a response speed of 384.6f/s. This research not only demonstrates the superiority of DOLP-YOLOv5 in face mask wearing detection, but also has certain reference significance for other detection of polarization imaging.Addresses:[Li, Bosong; Li, Yahong; Li, Kexian] Dalian Polytech Univ, Res Inst Photon, Dalian 116034, Peoples R China; [Fu, Yuegang; Ouyang, Mingzhao] Changchun Univ Sci & Technol, Sch Optoelect Engn, Changchun 130022, Peoples R China; [Jia, Wentao] Chinese Acad Sci, Key Lab Space Precis Measurement Technol, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R ChinaAffiliations:Dalian Polytechnic University; Changchun University of Science & Technology; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CASPublication Year:2024Volume:32Issue:20Start Page:34678End Page:34693DOI Link:http://dx.doi.org/10.1364/OE.528929數(shù)據(jù)庫ID（收錄號）:WOS:001326967700010 -
Record 74 of
Title:Optical design of a 5x zoom afocal telescope with deformable mirrors
Author Full Names:Zou, Gangyi; Fan, Xuewu; Zhao, Hui; Pang, Zhihai; Xie, Xiaopeng; Xu, LiangSource Title:OPTICS EXPRESSLanguage:EnglishDocument Type:ArticleKeywords Plus:SYSTEMSAbstract:All-reflective zoom afocal telescopes can be integrated with existing imaging systems as foreoptics, enabling flexible imaging with adjustable resolution. This paper proposes an approach to designing a 5x x zoom afocal telescope using deformable mirrors. Based on matrix optics, the first-order parameters for a coaxial reflective 5x x zoom afocal telescope with a fixed primary mirror and three deformable mirrors are determined. To prevent obscuration, the mirrors are tilted at their vertices, which introduces asymmetric aberrations. To correct these aberrations, XY polynomial surfaces are employed on the primary mirror and an additional flat fold mirror. The final design and image simulations indicate that the system achieves good image quality across all zoom positions, enabling 5x zoom imaging with a maximum root mean square wavefront error of less than 0.125 lambda (lambda = 632.8 nm), thereby validating the efficacy of the proposed design methodology.Addresses:[Zou, Gangyi; Fan, Xuewu; Zhao, Hui; Pang, Zhihai; Xie, Xiaopeng; Xu, Liang] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Space Opt Lab, Xian 710119, Peoples R China; [Zou, Gangyi] 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:32Issue:20Start Page:34622End Page:34638DOI Link:http://dx.doi.org/10.1364/OE.537331數(shù)據(jù)庫ID（收錄號）:WOS:001326967700002 -
Record 75 of
Title:Effects and optimizations of image charge technology on the imaging performance of capacitive division image readout MCP detectors
Author Full Names:Wang, Bo; Yang, Kai; Bai, Yonglin; Cao, Weiwei; Bai, Xiaohong; Zheng, JinkunSource Title:NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENTLanguage:EnglishDocument Type:ArticleKeywords Plus:ANODESAbstract:A finite element model is proposed to investigate the impact of image charge technology on the imaging performance of capacitive division image readout (C-DIR) devices. Through detailed simulation analysis, we explore the charge density of the induction layer and each electrode layer in the multilayer capacitive anode. The position nonlinearity is calculated for various resistances per square of the induction layer and substrate thicknesses. The simulation results indicate a strong linear correlation between the position nonlinearity and substrate thickness, and an exponential decay relationship with the logarithmic resistance per square of the induction layer. The C-DIR detector is experimentally tested for imaging nonlinearity and counting rate, with the resistance per square of the induction layer ranging from 0.005 to 1000 M Omega, and the substrate thickness ranging from 1 to 5 mm. The experimental results validate the simulation conclusions and reveal the impact of the charge accumulation effect and shielding effect on the imaging performance of the detector, as well as the imaging compression phenomenon. Optimized image charge readout technology enables the C-DIR detector to achieve an imaging nonlinearity of 1.53% in the experiment.Addresses:[Wang, Bo; Yang, Kai; Bai, Yonglin; Cao, Weiwei; Bai, Xiaohong; Zheng, Jinkun] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Ultrafast Photoelect Diagnost Technol, Xian 710119, Peoples R China; [Yang, Kai] Chinese Acad Sci, Grad Sch, 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:1069Article Number:169879DOI Link:http://dx.doi.org/10.1016/j.nima.2024.169879數(shù)據(jù)庫ID（收錄號）:WOS:001319458000001 -
Record 76 of
Title:Optical fibre based artificial compound eyes for direct static imaging and ultrafast motion detection
Author Full Names:Jiang, Heng; Tsoi, Chi Chung; Yu, Weixing; Ma, Mengchao; Li, Mingjie; Wang, Zuankai; Zhang, XumingSource Title:LIGHT-SCIENCE & APPLICATIONSLanguage:EnglishDocument Type:ArticleAbstract:Natural selection has driven arthropods to evolve fantastic natural compound eyes (NCEs) with a unique anatomical structure, providing a promising blueprint for artificial compound eyes (ACEs) to achieve static and dynamic perceptions in complex environments. Specifically, each NCE utilises an array of ommatidia, the imaging units, distributed on a curved surface to enable abundant merits. This has inspired the development of many ACEs using various microlens arrays, but the reported ACEs have limited performances in static imaging and motion detection. Particularly, it is challenging to mimic the apposition modality to effectively transmit light rays collected by many microlenses on a curved surface to a flat imaging sensor chip while preserving their spatial relationships without interference. In this study, we integrate 271 lensed polymer optical fibres into a dome-like structure to faithfully mimic the structure of NCE. Our ACE has several parameters comparable to the NCEs: 271 ommatidia versus 272 for bark beetles, and 180 degrees field of view (FOV) versus 150-180 degrees FOV for most arthropods. In addition, our ACE outperforms the typical NCEs by similar to 100 times in dynamic response: 31.3 kHz versus 205 Hz for Glossina morsitans. Compared with other reported ACEs, our ACE enables real-time, 180 degrees panoramic direct imaging and depth estimation within its nearly infinite depth of field. Moreover, our ACE can respond to an angular motion up to 5.6x10(6) deg/s with the ability to identify translation and rotation, making it suitable for applications to capture high-speed objects, such as surveillance, unmanned aerial/ground vehicles, and virtual reality.Addresses:[Jiang, Heng; Tsoi, Chi Chung; Li, Mingjie; Zhang, Xuming] Hong Kong Polytech Univ, Dept Appl Phys, Hong Kong 999077, Peoples R China; [Jiang, Heng; Tsoi, Chi Chung; Zhang, Xuming] Hong Kong Polytech Univ, Photon Res Inst PRI, Hong Kong 999077, Peoples R China; [Yu, Weixing] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol, Xian 710119, Peoples R China; [Ma, Mengchao] Hefei Univ Technol, Sch Instrument Sci & Opto Elect Engn, Anhui Prov Key Lab Measuring Theory & Precis Instr, Hefei 230009, Peoples R China; [Wang, Zuankai] Hong Kong Polytech Univ, Dept Mech Engn, Hong Kong 999077, Peoples R China; [Zhang, Xuming] Hong Kong Polytech Univ, Res Inst Adv Mfg RIAM, Hong Kong 999077, Peoples R ChinaAffiliations:Hong Kong Polytechnic University; Hong Kong Polytechnic University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Hefei University of Technology; Hong Kong Polytechnic University; Hong Kong Polytechnic UniversityPublication Year:2024Volume:13Issue:1Article Number:256DOI Link:http://dx.doi.org/10.1038/s41377-024-01580-5數(shù)據(jù)庫ID（收錄號）:WOS:001315739600001 -
Record 77 of
Title:Research on the spacecraft ground equivalence test assessment problem: A comprehensive assessment method combining interval-type evaluation and prospect-two-dimensional cloud
Author Full Names:Ding, Wenzhe; Bai, Xiang; Wang, Qingwei; Yao, Huisheng; Liu, Jian; Yang, HongSource Title:APPLIED SOFT COMPUTINGLanguage:EnglishDocument Type:ArticleKeywords Plus:PROSPECT-THEORY; DECISIONAbstract:For the complex dual-attribute qualitative assessment problem of spacecraft ground equivalence tests, the paper proposes a comprehensive assessment method that integrates interval-type evaluation with prospect theory and the two-dimensional cloud model. Firstly, to reduce the difficulty of determining indicator weights, the paper adopts interval-type evaluation and obtains reasonable interval weights of each indicator under dual attributes by interval analytic hierarchy process (IAHP). Secondly, to reduce the uncertainty of assessment and achieve the transformation of interval weights to value weights, the paper combines the prospect theory to obtain the value weight of each indicator that can maximize the personality preference satisfaction of the decision-maker by maximizing the integrated prospect value. During this period, to avoid the construction of a complex score function, the theoretical gain and loss values of indicator evaluation were obtained directly from the theoretical calculation based on the location of interval evaluation results in relation to interval psychological reference points. Again, to judge the validity of the interval evaluation of indicators, the paper theoretically derives an inverse cloud generator for interval-type samples and then realizes the validity analysis of the interval evaluation of indicators based on the 3-sigma principle of clouds. Then, to solve the problem of dual-attribute assessment of equivalence tests, the paper achieves the effective assessment of spacecraft ground equivalence tests through inter-cloud aggregation and similarity calculation of two-dimensional cloud models. Finally, the application of the method in a specific assessment case verifies the feasibility, validity, and practicality of the method in this paper.Addresses:[Ding, Wenzhe; Bai, Xiang; Wang, Qingwei; Yao, Huisheng; Liu, Jian; Yang, Hong] Beijing Inst Tracking & Telecommun Technol, Beijing 100096, Peoples R China; [Ding, Wenzhe] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China; [Ding, Wenzhe] Natl Key Lab Space Integrated Informat Syst, Beijing 100096, Peoples R China; [Yang, Hong] Chinese Acad Sci, Aerosp Informat Res Inst, Beijing 100094, Peoples R ChinaAffiliations:Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; Chinese Academy of Sciences; Aerospace Information Research Institute, CASPublication Year:2024Volume:166Article Number:111882DOI Link:http://dx.doi.org/10.1016/j.asoc.2024.111882數(shù)據(jù)庫ID（收錄號）:WOS:001317913400001 -
Record 78 of
Title:Efficient anti-frosting enabled by femtosecond laser-induced salt-philic and superhydrophobic surface
Author Full Names:Deng, Qinwen; Wu, Tingni; Yin, Kai; Li, Xun; Wang, Lingxiao; Huang, Qiaoqiao; Huang, Yin; Arnusch, Christopher J.; Duan, Ji-AnSource Title:APPLIED PHYSICS LETTERSLanguage:EnglishDocument Type:ArticleKeywords Plus:CONDENSATION; ICE; STRATEGIES; DESIGN; GROWTH; DELAY; FILMSAbstract:Frost formation is a normal phase transition phenomenon in cold climates, while it usually brings certain troubles to human lives and production. Therefore, it is of great significance to develop frost resistant materials and key technologies. Here, a salt-philic and superhydrophobic surface is designed on a PDMS substrate by femtosecond laser direct writing technology in combination with salt-ethanol-water mixtures droplet treatment. The laser-treated PDMS embedded salt (LTP-S) surface exhibits superhydrophobicity, which alone is a property that can resist the formation of frost and enables a self-cleaning effect. Meanwhile, the salt coating further enhances the frost resistance of the surface by reducing the freezing point temperature. The LTP-S surface is revealed to perform well in frosting-defrosting cycles, washing resistance, chemical corrosion resistance, heating resistance, and long-term air exposure tests as a highly efficient and stable anti-frosting surface. This work demonstrates a facile strategy to fabricate a salt-philic and superhydrophobic surface for efficient anti-frosting.Addresses:[Deng, Qinwen; Wu, Tingni; Yin, Kai; Wang, Lingxiao; Huang, Qiaoqiao; Huang, Yin] Cent South Univ, Sch Phys, Hunan Key Lab Nanophoton & Devices, Changsha 410083, Peoples R China; [Yin, Kai; Duan, Ji-An] Cent South Univ, Coll Mech & Elect Engn, State Key Lab Precis Mfg Extreme Serv Performance, Changsha 410083, Peoples R China; [Yin, Kai] Huazhong Univ Sci & Technol, State Key Lab Intelligent Mfg Equipment & Technol, Wuhan 430000, Peoples R China; [Li, Xun] Xian Inst Opt & Precis Mech CAS, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Arnusch, Christopher J.] Ben Gurion Univ Negev, Zuckerberg Inst Water Res, Jacob Blaustein Inst Desert Res, Dept Desalinat & Water Treatment, Sede Boqer Campus, IL-84990 Midreshet Ben Gurion, IsraelAffiliations:Central South University; Central South University; Huazhong University of Science & Technology; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & Photonics; Ben Gurion UniversityPublication Year:2024Volume:125Issue:12Article Number:121602DOI Link:http://dx.doi.org/10.1063/5.0232717數(shù)據(jù)庫ID（收錄號）:WOS:001315386400009 -
Record 79 of
Title:Metasurface-based broadband full Stokes polarimeter with optimized simulation design
Author Full Names:Zhao, Jiaqi; Li, Yingbo; Li, Siqi; Wang, GuoxiSource Title:APPLIED PHYSICS LETTERSLanguage:EnglishDocument Type:ArticleKeywords Plus:IMAGING POLARIMETRY; POLARIZATION; DISPERSION; RETARDATION; POLARIZERS; VISIBILITY; GRATINGSAbstract:A polarimeter, fundamental for characterizing the polarization state of light, is critical for advancing optical measurement techniques by delivering precise polarization information. A compact and portable polarimeter holds particular importance in applications like remote sensing and medical diagnosis. However, existing methods for developing a compact polarimeter are difficult to achieve full Stokes vector detection for broadband operation, and the noise immunity is also very weak. These defects significantly constrain the versatility of polarimeters across diverse application scenarios. Herein, a metadevice with dual-layer subwavelength grating structure for full Stokes vector detection has been proposed, capable of simultaneously achieving broadband detection and noise suppression. The intensity of the four elliptical polarization states of the incident light can be captured by four regions on this metadevice, enabling the computation of the full polarization state information via Mueller matrix inversion. Additionally, a set of optimized retardance at 0.73 pi and orientation angles at 43 degrees, 80 degrees, 111 degrees, and 146 degrees is provided to effectively suppress the noise. The results indicate that the recovery error remains below 5% across the 450-650 nm spectral range, showcasing a 1.5-fold enhancement in noise suppression capability compared to conventional structures.Addresses:[Zhao, Jiaqi; Li, Yingbo; Li, Siqi; Wang, Guoxi] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Zhao, Jiaqi; Li, Yingbo; Wang, Guoxi] Univ Chinese Acad Sci, Beijing 100049, Peoples R ChinaAffiliations:State Key Laboratory of Transient Optics & Photonics; 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:125Issue:12Article Number:121701DOI Link:http://dx.doi.org/10.1063/5.0223058數(shù)據(jù)庫ID（收錄號）:WOS:001313859600020 -
Record 80 of
Title:Portable Stand-Off Time-Gated Raman Spectroscopy for Detection of Explosive Precursor
Author Full Names:Ren, Wenzhen; Wang, Hui; Xie, Zhengmao; Zhu, Xiangping; Zhang, Pu; Wang, Bo; Huang, Cheng; Xu, Dandan; Zhao, WeiSource Title:JOURNAL OF APPLIED SPECTROSCOPYLanguage:EnglishDocument Type:ArticleAbstract:Remote detection of trace explosives and hazardous chemicals has been an ongoing challenge and a critical issue in defense science, public safety, and counterterrorism. Raman spectroscopy, a form of inelastic scattering, acts as a fingerprint analysis method for substance identification with high confidence in the detection of chemicals based on their vibrational modes. Here, we present a portable stand-off time-gated Raman spectroscopy, which consists of a passive Q-switched pulsed laser, a designed gated ICMOS, a spectrometer, and a telescope, with an overall size of 476.5 x 321.5 x 219.3 mm and a weight of 23.2 kg, which is much more compact and portable than reported previously. To confirm the effectiveness of the designed portable time-gated Raman spectroscopy, detections at different working distances and various amounts of substances are carried out. High levels of Raman identification are acquired even for 0.1 mg at a 10-m distance. Furthermore, we simulate realistic encounters in a possible war-zone scenario by testing the system's ability to recognize urea samples on different substrates such as an aluminum plate, woodblock, cardboard, black cloth, and leaf; good characteristic recognition is shown.Addresses:[Ren, Wenzhen; Zhu, Xiangping; Zhang, Pu; Wang, Bo; Huang, Cheng; Zhao, Wei] State Key Lab Transient Opt & Photon, Xian 710119, Peoples R China; [Ren, Wenzhen; Xie, Zhengmao; Zhu, Xiangping; Zhang, Pu; Wang, Bo; Huang, Cheng; Zhao, Wei] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian, Peoples R China; [Wang, Hui] Sci & Technol Near Surface Detect Lab, Wuxi, Peoples R China; [Wang, Hui; Xu, Dandan] First Sci Res Inst Wuxi, Wuxi, Peoples R China; [Wang, Hui; Zhu, Xiangping; Zhang, Pu; Wang, Bo; Huang, Cheng; Zhao, Wei] Univ Chinese Acad Sci, Beijing, Peoples R China; [Zhu, Xiangping; Zhang, Pu; Zhao, Wei] Key & Core Technol Innovat Inst, Greater Bay Area, Guangzhou, Guangdong, Peoples R ChinaAffiliations:Chinese Academy of Sciences; State Key Laboratory of Transient Optics & Photonics; 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:91Issue:4Start Page:953End Page:960DOI Link:http://dx.doi.org/10.1007/s10812-024-01805-w數(shù)據(jù)庫ID（收錄號）:WOS:001312681800012 -
Record 81 of
Title:Multi-level efficient 3D image reconstruction model based on ViT
Author Full Names:Zhang, Renhao; Hu, Bingliang; Chen, Tieqiao; Zhang, Geng; Li, Siyuan; Chen, Baocheng; Liu, Jia; Jia, Xinyin; Wang, Xing; Su, Chang; Li, Xijie; Zhang, Ning; Qiao, KaiSource Title:OPTICS EXPRESSLanguage:EnglishDocument Type:ArticleAbstract:Single-photon LIDAR faces challenges in high-quality 3D reconstruction due to high noise levels, low accuracy, and long inference times. Traditional methods, which rely on statistical data to obtain parameter information, are inefficient in high-noise environments. Although convolutional neural networks (CNNs)-based deep learning methods can improve 3D reconstruction quality compared to traditional methods, they struggle to effectively capture global features and long-range dependencies. To address these issues, this paper proposes a multi-level efficient 3D image reconstruction model based on vision transformer (ViT). This model leverages the self-attention mechanism of ViT to capture both global and local features and utilizes attention mechanisms to fuse and refine the extracted features. By introducing generative adversarial ngenerative adversarial networks (GANs), the reconstruction quality and robustness of the model in high noise and low photon environments are further improved. Furthermore, the proposed 3D reconstruction network has been applied in real-world imaging systems, significantly enhancing the imaging capabilities of single-photon 3D reconstruction under strong noise conditions. (c) 2024 Optica Publishing Group under the terms of the Optica Open Access Publishing AgreementAddresses:[Zhang, Renhao; Hu, Bingliang; Chen, Tieqiao; Zhang, Geng; Li, Siyuan; Chen, Baocheng; Liu, Jia; Jia, Xinyin; Li, Xijie; Zhang, Ning] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Key Lab Spectral Imaging Technol CAS, Xian 710119, Peoples R China; [Zhang, Renhao; Chen, Baocheng; Su, Chang; Qiao, Kai] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Liu, Jia] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Peoples R China; [Wang, Xing; Su, Chang; Qiao, Kai] Chinese Acad Sci, Key Lab Ultrafast Photoelect Diagnost Technol, Xian 710119, Peoples R China; [Liu, Jia] Minist Nat Resources, Inst Oceanog 2, State Key Lab Satellite Ocean Environm Dynam, Hangzhou 310012, 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; South China Sea Institute of Oceanology, CAS; Chinese Academy of Sciences; Ministry of Natural Resources of the People's Republic of China; Second Institute of Oceanography, Ministry of Natural ResourcesPublication Year:2024Volume:32Issue:19Start Page:33917End Page:33936DOI Link:http://dx.doi.org/10.1364/OE.535211數(shù)據(jù)庫ID（收錄號）:WOS:001318649400008 -
Record 82 of
Title:SPR based dual parameter wide range curling pot shaped photonic crystal fiber sensor
Author Full Names:Guo, Pengxiao; Du, Huijing; Li, Jianshe; Li, Yuxin; Li, Shuguang; Yin, Zhiyong; Wang, Ruiduo; Li, Kaifeng; Li, Hongwei; Li, XingweiSource Title:PHYSICA SCRIPTALanguage:EnglishDocument Type:ArticleAbstract:This article proposes a curling pot shaped photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR), which utilizes two parallel polished surfaces in the cladding to achieve dual parameter measurements of liquid refractive index (RI) and temperature. The mode characteristics and sensing performance of the designed PCF sensor are studied using the finite element method, and the effects of changes in structural parameters such as pore radius, spacing, and gold film thickness on the resonance spectrum are analyzed. The sensing accuracy of the sensor is insensitive to the change of structural parameters, and it has the characteristics of a wide detection range, high sensitivity, and easy manufacture. When the measured RI is in the range of 1.33 similar to 1.42, the maximum RI sensitivity is 20400 nm RIU-1, and the maximum FOM is 483.3 RIU-1. When the temperature ranges from -10 degrees C to 100 degrees C, the maximum sensitivity is 15.4 nm degrees C-1, and the maximum FOM is 0.43 RIU-1. The tight structure design of the sensor core close to the polishing surface and the anti-spill light design with a uniform arrangement of air holes enhance the SPR effect, which is the essential reason for achieving a wide detection range and high sensitivity.Addresses:[Guo, Pengxiao; Du, Huijing; Li, Jianshe; Li, Yuxin; Li, Shuguang; Yin, Zhiyong; Li, Kaifeng; Li, Hongwei; Li, Xingwei] Yanshan Univ, Sch Sci, State Key Lab Metastable Mat Sci & Technol, Qinhuangdao 066004, Peoples R China; [Guo, Pengxiao; Du, Huijing; Li, Jianshe; Li, Yuxin; Li, Shuguang; Yin, Zhiyong; Li, Kaifeng; Li, Hongwei; Li, Xingwei] Yanshan Univ, Sch Sci, Key Lab Microstruct Mat Phys Hebei Prov, Qinhuangdao 066004, Peoples R China; [Wang, Ruiduo] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian, Peoples R ChinaAffiliations:Yanshan University; Yanshan University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & PhotonicsPublication Year:2024Volume:99Issue:9Article Number:95902DOI Link:http://dx.doi.org/10.1088/1402-4896/ad6694數(shù)據(jù)庫ID（收錄號）:WOS:001282100400001 -
Record 83 of
Title:Power-Guided Asymmetrical Vector Dissipative Soliton Molecules in a Compact Fiber Resonator
Author Full Names:Huang, Xiangzhen; Li, Xiaohui; Chen, Enci; Pan, Zhiwen; Guo, Penglai; Sun, Liaoxin; Wang, Yishan; Zhao, WeiSource Title:IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICSLanguage:EnglishDocument Type:ArticleKeywords Plus:BIREFRINGENT OPTICAL-FIBERS; LASER; DISPERSION; GENERATION; STABILITY; EVOLUTION; LOCKING; SCALARAbstract:Vector dissipative soliton molecules (VDSMs) can be promising for polarization multiplexing transmission applications. We report a nonlinear polarization rotation (NPR) vector dissipative soliton molecule laser. The laser realizes three-type vector dissipative soliton molecules of directly generated 1+2 type, 2+2 type, and outer-cavity projected super-position 2+'2+2' type just by changing the pump power. It's proved that the different generated methods of vector soliton molecules in Hamiltonian systems can also be realized in dissipative systems. This is also the first time that multiple different generated methods of vector dissipative soliton molecules are realized in a fiber resonator based on NPR. The results proved the VDSMs' structures can be controlled, which can be potentially applied in optical frequency comb, optical communication systems, optical logic processing, optical detection, etc.Addresses:[Huang, Xiangzhen; Li, Xiaohui; Pan, Zhiwen] Shaanxi Normal Univ, Sch Phys & Informat Technol, Xian 710000, Peoples R China; [Chen, Enci] Guangxi Univ Sci & Technol, Sch Elect Engn, Liuzhou 545006, Peoples R China; [Guo, Penglai] Macau Univ Sci & Technol, Sch Comp Sci & Engn, Macau 999078, Peoples R China; [Sun, Liaoxin] Shanghai Inst Tech Phys, State Key Lab Infrared Phys, Shanghai 200083, Peoples R China; [Wang, Yishan] Chinese Acad Sci, Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R ChinaAffiliations:Shaanxi Normal University; Guangxi University of Science & Technology; Macau University of Science & Technology; Chinese Academy of Sciences; Shanghai Institute of Technical Physics, CAS; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & PhotonicsPublication Year:2024Volume:30Issue:5Article Number:2100106DOI Link:http://dx.doi.org/10.1109/JSTQE.2023.3319342數(shù)據(jù)庫ID（收錄號）:WOS:001179324200001 -
Record 84 of
Title:Underwater image enhancement via color correction and multi-feature image fusion
Author Full Names:Ke, Ke; Zhang, Biyun; Zhang, Chunmin; Yao, Baoli; Guo, Shiping; Tang, FengSource Title:MEASUREMENT SCIENCE AND TECHNOLOGYLanguage:EnglishDocument Type:ArticleKeywords Plus:RECOVERY; MODELAbstract:The light attenuation underwater causes the actual underwater images to suffer from color cast, low contrast, and weak illumination. To address these issues, an effective fusion-based method is proposed, which realizes color correction (CC), brightness adjustment, contrast, and detail enhancement of underwater images. Concretely, we first design an adaptive CC method via dominant color channel judgment and lower color channel compensation. Then, we detect the brightness of each input image and propose a gamma correction function based on the gradient of the cumulative histogram to adjust the brightness of the low-light images. Subsequently, global histogram stretching and adaptive fractional differentiation techniques are employed to process the brightness-adjusted image, and then the global contrast-enhanced version and detail-enhanced version are generated respectively. To integrate the advantages of both versions, a channel fusion method based on the Lab color space is used to fuse the luminance and color of the two versions separately. The experimental results demonstrate the effectiveness of the proposed method in improving the color and illumination of underwater images, as well as enhancing the clarity of images. Moreover, the testing results on multiple datasets validate the excellent stability of this method.Addresses:[Ke, Ke; Zhang, Chunmin; Guo, Shiping; Tang, Feng] Xi An Jiao Tong Univ, Sch Phys, Xian 710049, Peoples R China; [Ke, Ke; Zhang, Chunmin; Guo, Shiping; Tang, Feng] Xi An Jiao Tong Univ, Inst Space Opt, Xian 710049, Peoples R China; [Zhang, Biyun] BA Trading Guangzhou Co Ltd, Guangzhou 510000, Peoples R China; [Ke, Ke; Yao, Baoli] Chinese Acad Sci, Xian Inst Opt & Precis Mech, State Key Lab Transient Opt & Photon, Xian 710119, Peoples R ChinaAffiliations:Xi'an Jiaotong University; Xi'an Jiaotong University; Chinese Academy of Sciences; Xi'an Institute of Optics & Precision Mechanics, CAS; State Key Laboratory of Transient Optics & PhotonicsPublication Year:2024Volume:35Issue:9Article Number:96123DOI Link:http://dx.doi.org/10.1088/1361-6501/ad4dca數(shù)據(jù)庫ID（收錄號）:WOS:001251778700001