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8th optoelectronics Global Conference, OGC 2023

作者： Li, Juan Wang, Jindong Zhu, Tao Chongqing University Key Laboratory of Optoelectronic Technology & System Chongqing China

ISBN: (纸本)9798350325324

In this paper, we present a novel surface reconstruction algorithm leveraging curvatures and lengths between discrete points. By integrating this algorithm with a shape sensing system, we achieve high-speed measurement of wing shapes. The simulation and experimental results clearly demonstrate the effectiveness of our proposed algorithm in restoring preset curves. The average relative error is found to be at a remarkable level of 10-2, while the average running time remains at an impressive level of 10-2 s. Additionally, through static and dynamic shape perception performed by the shape sensing system, we observe a relative error of 4.85% when subjecting the simulated wing to uniform tension, and a relative error of 3.1% under twisted tension conditions. These findings confirm the capability of our experimental device to accomplish rapid morphological monitoring at an impressive frequency of 505 kHz. © 2023 IEEE.

关键词： Morphology

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Shape recognition and size measurement of particles in hybrid particle field based on interference technology

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optoelectronics Letters 2024年第8期20卷 472-476页

作者： SUN Jinlu QIU Yue WU Yuhang ZHAO Dan MIAO Changyun Tianjin Key Laboratory of Optoelectronic Detection Technology and System Tianjin 300387China School of Electronic and Information Engineering Tiangong UniversityTianjin 300387China

An algorithm that can implement particle shape recognition and size measurement in hybrid particle field is *** on the defocused images obtained by the interferometric particle imaging(IPI)system,shape recognition of particles can be realized through Res ***-dimensional(2D)Fourier transform and 2D autocorrelation transform are used to obtain the size of spherical and non-spherical particles,*** shape and size of the particle in hybrid particle field are *** simulation and experiment results suggest that the method has good accuracy in measuring the particle size in hybrid particle field.

关键词： field particle size

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A Multimodal Approach for Prediction of Plastic Color Formulation with Transformers and Convolutional Networks 24

A Multimodal Approach for Prediction of Plastic Color Formul...

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13th International Conference on Computing and Pattern Recognition, ICCPR 2024

作者： Geng, Lei Sun, Huiyu Wang, Wen Xiao, Zhitao Zhang, Fang Liu, Yanbei School of Life Sciences Tianjin Key Laboratory of Optoelectronic Detection Technology and System Tiangong University Tianjin China

ISBN: (纸本)9798400717482

Color formulation prediction aims to get different target colors based on a specified color range. It was difficult for existing color matching methods to achieve accurate nonlinear mapping from target colors to formulations due to the overlook of the global and local features of color information. Global featuress represent the long-range variation trends of the input information, while local features represent the numerical characteristics of the input data. To address this issue, a novel feature extraction block based on Transformer and parallel convolutional neural network was proposed for the first time. By integrating this block with a color feature extractor after the fusion of color features, a multimodal color feature fusion network framework was constructed to comprehensively learn the nonlinear mapping between multi-modal inputs and formulations, formulation reflectance curves. This network framework achieved a total loss of 0.0421 and a formulation loss of 0.0391 on test set, indicating more accurate color formula predictions. © 2024 Copyright held by the owner/author(s).

关键词： Convolutional neural networks

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Simulation of random fiber Bragg grating array in polarization-maintaining fiber based on photonic localization effect

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optoelectronics Letters 2024年第8期20卷 460-471页

作者： LI Zhihan HE Wei LI Shaode Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science and Technology UniversityBeijing 100192China Beijing Laboratory of Optical Fiber Sensing and System Beijing Information Science and Technology UniversityBeijing 100192China

Mid-infrared wavelength switchable and dual-wavelength random laser output has many potential applications.A polarization-maintaining random fiber Bragg grating(PMRFBG)array based on the photonic localization effect of longitudinal invariant transverse disorder in fiber structure is proposed,which can be used as random feedback of dual-wavelength and wavelength switchable output of random fiber laser(RFL).The random fiber Bragg grating(RFBG)array was designed on the panda-type polarization-maintaining fiber(PMF),and the two center wavelengths were 2151.60 nm and 2152.22 nm,*** RFBG array was designed on the bow tie-type PMF,and the two center wavelengths were obtained,which were 2153.08 nm and 2153.96 nm,*** RFBG array with a center wavelength of 2139.27 nm was designed on single-mode fiber(SMF).The length of individual fiber Bragg grating(FBG)and PMRFBG,the refractive index modulation depth,the number of cascaded gratings,and the distance between gratings have different effects on the full width at half maximum(FWHM)and reflectance of the RFBG and PMRFBG array,but not on the central wavelength,as obtained by simulation using the transmission matrix *** designed PMRFBG array provides theoretical support for the design of the feedback mechanism of RFL.

关键词： fiber polarization random

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Synergistic Brønsted Base/Photoredox-Catalyzed Three-Component Coupling with Malonates to Synthesize δ-Hydroxy Esters and δ-Keto Esters

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Chinese Journal of Chemistry 2024年第9期42卷 957-962页

作者： Ting Li Wei Wang Ming Dong Zhije Zhang Sha Yu Zhengchu Chen Siping Wei Dong Yi Green Pharmaceutical Technology Key Laboratory of Luzhou City Central Nervous System Drug Key Laboratory of Sichuan ProvinceSchoolof PharmacySouthwestMedicalUniversityLuzhouSichuan 646000China Nuclear Medicine and Molecular Imaging Key Laboratory of Sichuan Province LuzhouSichuan 646000China

Multicomponent alkene 1,2-dicarbofunctionalizations(DCFs)have emerged as a powerful strategy to rapidly incorporate both two carbon subunits across one C-C double bond in one step for enhancing molecular complexity and *** the best of our knowledge,there is only one report on photoredox-catalyzed three-component DCFs with malonates through the radical−radical cross-coupling,while photoredox-catalyzed radical-polar crossover(RPC)-type DCFs with malonates were still ***,we describe a redox-neutral RPC-type 1,2-dialkylation of styrenes with malonates and aldehydes through the synergistic Brønsted base/photoredox catalysis *** transition-metal-free strategy provides an efficient and clean approach to a broad variety ofδ-hydroxy esters and also features exceptionally mild conditions,wide compatibility of substrate scope and functional groups,and high atomic ***,three-component 1,2-alkylacylation from the same starting materials was achieved in one-pot manner through such RPC-type coupling and subsequent two-electron oxidation process,providing a set ofδ-keto esters of interest in pharmaceutical research.

关键词： Alkene difunctionalization Photoredox catalysis Malonates Radical reactions C-C coupling Synthetic methods Aldehydes Alkylation Multicomponentreactions

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Design and simulation of a silicon-based hybrid integrated optical gyroscope system

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Chinese Physics B 2023年第4期32卷 397-404页

作者：孙道鑫张东亮鹿利单徐涛郑显通周哲海祝连庆 Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science&Technology UniversityBeijing 100192China Beijing Laboratory of Optical Fiber Sensing and System Beijing Information Science&Technology UniversityBeijing 100016China

By combining a silicon-based lithium niobate modulator and a silicon-based Si3N4resonator with silicon-based photonics technology,a highly systematic design of a hybrid integrated optical gyroscope with enhanced reciprocity sensitivity and a dual micro-ring structure is proposed for the first time in this *** relationship between the device's structural parameters and optical performance is also analyzed by constructing a complete simulation link,which provides a theoretical design reference to improve the system's *** the wavelength is 1550 nm,the conversion frequency of the dual-ring optical path is 50 MHz,the coupling coefficient is 0.2,and the radius R is 1000μm,the quality factor of the silicon-based Si_(3)N_(4)resonator is 2.58×10^(5),which is 1.58 times that of the silicon-on-insulator ***,the effective number of times the light travels around the ring before leaving the micro-ring is 5.93,which is 1.62 times that of the silicon-on-insulator *** work fits the gyro dynamic output diagram,and solves the problem of low sensitivity at low speed by setting the phase *** results provide a basis for the further optimization of design and chip processing of the integrated optical gyroscope.

关键词： silicon photonics integrated optical gyroscope micro-ring resonator Sagnac effect

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Vertical-Polarized Tri-Band Monopolar Antenna With Controllable and Stackable Notched Frequencies

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IEEE Antennas and Wireless Propagation Letters 2025年第6期24卷 1437-1441页

作者： Li, You Peng, Jian-Dong Ye, Liang Hua Guangdong University of Technology School of Physics and Optoelectronic Engineering Guangzhou510006 China Guangdong University of Technology Guangdong Provincial Key Laboratory of Sensing Physics and System Integration Applications Guangzhou510006 China

A new scheme of stacking tri-notched frequencies is introduced to develop a tri-band omnidirectional antenna with vertical polarization. In this scheme, a ground plane and a three-sector M-shaped sheet with a top-loaded patch are excited by a 50 Ω coaxial cable, aiming to achieve excellent impedance and vertical-polarized omnidirectional radiation performance within a broad bandwidth. Subsequently, a three-sector fan-shaped patch with three metal holes, three I-shaped slots and three 1.0λ resonant rings are successively introduced to create two stopbands at 2.75 GHz to 3.25 GHz and 4.25 GHz to 4.37 GHz, thereby dividing the ultra-broad band into three desired bands. In our design, the notched bands can be controlled by altering the sizes of the fan-shaped patch, metal hole, I-shaped slot, and resonant ring. The test results indicate that the proposed antenna has three operating bands at 1.44 GHz to 2.76 GHz, 3.19 GHz to 4.36 GHz, and 4.50 GHz to 4.70 GHz. The tri-band antenna also has good omnidirectivity and a low profile of 0.049λm (λm stands for the maximum wavelength in the operating band), indicating its suitability for indoor communication in the bands of FDD/DCS/PCS/UMTS, LTE, and 5G NR n77/partial n79. © 2002-2011 IEEE.

关键词： Omnidirectional antennas

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Research on an automatic light field refocusing method for a camera array

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Optics Express 2025年第10期33卷 20964-20980页

作者： Pan, Yihua Zhao, Yushan Li, Yuyang Liu, Bin Chen, Ping Shanxi Key Laboratory of Intelligent Detection Technology & Equipment School of Information and Communication Engineering North University of China Shanxi Taiyuan030051 China Key Laboratory of Photoelectronic Imaging Technology System of Ministry of Education of China School of Optics and Photonics Beijing Institute of Technology Beijing100081 China State Key Laboratory of Extreme Environment Optoelectronic Dynamic Testing Technology and Instruments North University of China Shanxi Taiyuan030051 China

Light field information includes the position and angle information of light in space. A camera array is one of the methods for obtaining light field information, which combines and arranges multiple cameras in space to achieve multi-angle imaging of the same target. Based on the light field information, a computational imaging method can be used to achieve refocusing technology for a camera array (also known as optical synthetic aperture imaging technology). In this technology, by setting the focusing coefficient, the light field information can be focused on different depths. This mode is called taking photos first and focusing later. However, in order to focus on a specific object surface, traditional refocusing methods require users to manually adjust the focusing coefficient multiple times, which is time-consuming and user-unfriendly. Therefore, in this paper, we propose an automatic focusing method based on the optimal focusing coefficient map (OFCM) to address the manual refocusing problem. This method transforms the refocusing problem into obtaining the optimal focus coefficient map. In the process of solving OFCM, the threshold filtering method and the neighborhood filling method are used to optimize the results and improve the robustness of the proposed method. The experimental results show that our proposed method has higher imaging quality and faster running efficiency compared to automatic refocusing methods based on disparity maps and gradient functions. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Computational imaging

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Infrared Tiny Structureless Object Detection Enhanced by Video Super-Resolution

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IEEE Access 2025年 13卷 89983-89996页

作者： Mao, Duixu Chen, Xiaxu Xu, Linhan Ke, Jun Beijing Institute of Technology School of Optics and Photonics Beijing100081 China Key Laboratory of Photo-Electronic Imaging Technology and System Ministry of Education of China Beijing100081 China National Key Laboratory on Near-Surface Detection Beijing100072 China

The precise detection of infrared (IR) tiny objects against complex backgrounds is of great significance in the field of aircraft imaging guidance. However, due to the extremely small target features, low brightness, and the tendency to be submerged in complex backgrounds, the detection of IR tiny aerial targets remains a challenge. Concurrently, super-resolution technology is a novel technique that has emerged in recent years, aiming to enhance image quality without altering hardware specifications, thereby magnifying the characteristics of tiny targets. In light of this, we introduce the infrared tiny object detection method enhanced by video super-resolution. Our proposed method is a two-stage model. Initially, it enhances target features through bidirectional propagation and optical flow alignment within the super-resolution module. Subsequently, it employs restricted receptive field convolution and multi-receptive field feature fusion to enhance the detection accuracy of small targets. Experimental results on the SIATD data set show that our method performs better state-of-the-art approaches, with an F1 score of 0.957, precision of 99.2%, and recall of 92.4%. Ablation studies confirm that the super-resolution module contributes to 35% of the performance, while the restricted receptive field design accounts for another 28% improvement. Furthermore, our model maintains sub-real-time performance at 50ms per frame with only 0.37M parameters, making it suitable for deployment in resource-constrained environments. © 2013 IEEE.

关键词： Image resolution

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AWG-based large dynamic range fiber Bragg grating interrogation system

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optoelectronics Letters 2024年第3期20卷 129-134页

作者： LI Shufeng YUAN Pei LI Ke LI Ting ZHU Lianqing Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument Beijing Information Science&Technology UniversityBeijing 100192China Beijing Laboratory of Optical Fiber Sensing and System Beijing Information Science&Technology UniversityBeijing 100016China

Arrayed waveguide gratings(AWGs) are extensively employed in fiber Bragg grating(FBG) interrogation systems due to their compact size, lightweight nature, and excellent interrogation performance. The resolution and total measurement range of AWG-based FBG interrogation systems are constrained by the output properties of AWG. We proposed an AWG-based large dynamic range interrogation system. The temperature dependence of AWG is exploited to achieve continuous interrogation. The test results show that the interrogation system has a dynamic range of 28.67 nm, an interrogation accuracy better than 25 pm, and a wavelength resolution of 6 pm.

关键词： fiber waveguide AWG

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