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International Conference on Advanced Infocomm Technology (ICAIT)

作者： Zijie Wang Shuhui Liu Kaixin Zhao Shengguo Zhao Di Chen Zhengqing Shen Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan China

ISBN: (数字)9798350391497

ISBN: (纸本)9798350391503

An electric field (E-field) sensor based on liquid crystal (LC) infiltrated photonic crystal fiber (PCF) is proposed and experimentally demonstrated in this paper. Liquid crystals (5CB nematic liquid crystals, NLC) are filled into the cladding air holes of a PCF. A photonic bandgap type waveguide is then formed. Applying an external E-field to the NLC-filled PCF changes the alignment of the LC molecules in the LC layer, which affects the edge wavelength of the photonic bandgap. The E-field sensitivity is about 157.51 nm/kV/mm in the range of 130 V to 220 V (0.65 kV/mm to 1.1 kV/mm). The sensor is lightweight, low-cost, sensitive, and stable, and can be widely used in industrial production.

关键词： optical fiber sensors Sensitivity Claddings Photonic band gap Wavelength measurement Photonic crystal fibers Size measurement Liquid crystals Electric fields optical fiber testing

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Centerline Extraction of Line Structured Light in 3D Reconstruction

Centerline Extraction of Line Structured Light in 3D Reconst...

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2023 7th International Conference on Electrical, Mechanical and Computer Engineering (ICEMCE)

作者： Ji Zhang Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan China

At present, 3D reconstruction of binocular vision is a hot topic in the field of computer vision, and the extraction of laser fringe centers in line structured light images is a crucial step. In order to obtain the feature point set between the images, it is necessary to extract the centerline of the linear structured light bands. Firstly, through image preprocessing, perform image stereo correction and image Gaussian filtering, and adaptive threshold segmentation algorithm is used to segment the stripe area of the line structured light, and the image thinning algorithm is used to extract the initial centerline of the line structured light. Finally, the point set is constructed and the initial centerline is optimized twice by the gray-scale centroid method, and the centerline of the linear structured light stripe is accurately extracted. The results show that, compared with the Steger algorithm and the skeleton thinning method, the proposed method extracts the centerlines of the linear structured light stripes with higher accuracy.

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Applications of relative Raman intensity analyses

Applications of relative Raman intensity analyses

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第二十届全国光散射学术会议（CNCLS 20）

作者： Xiang-Bai Chen School of Science and Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology

Raman spectroscopy is a non-destructive and information rich technique which can provide detailed physical,chemical,and structural properties of investigated *** Raman analyses,studying the relative intensity ratios of characteristic Raman modes is more powerful than investigating the intensity of a particular mode,as it can provide more reliable and more detailed intrinsic information of the investigated *** this presentation,we discuss the applications of relative Raman intensity analyses for studying anomalous behaviors of spin wave scattering,quality screening of vegetable oil,and impurity influence on active center of *** the first part,the large asymmetry of anti-Stokes to Stokes intensity ratio of spin wave scattering is discussed for understanding the mechanism of spin wave and the manipulation of spin wave *** the second part,relative Raman intensity analyses is applied for possible quality evaluation of various types of edible vegetable *** the third part,it is discussed that relative Raman intensity analyses provides a simple method for quantitative measurement of impurity content in artemisinin,which can be a good alternative to the commonly applied high performance liquid chromatography method for measuring impurity content.

关键词： Relative Raman intensity analyses spin wave vegetable oil artemisinin

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CTDPGAN:Infrared and Visible Image Fusion Using CNN-Transformer Dual-Process-Based Generative Adversarial Network

CTDPGAN:Infrared and Visible Image Fusion Using CNN-Transfor...

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第42届中国控制会议

作者： Cheng Zhang Xuan Li Yuhang Xu Jie Wang Rongfu Chen Hubei Key Laboratory of Optical Information and Pattern Recognition School of Electrical and Information Engineering Wuhan Institute of Technology

Most of the existing image fusion methods prefer to use the adversarial learning game to fuse infrared and visible ***,such single adversarial mechanism makes image fusion task easily ignore global contextual *** this end,this paper proposes a CNN-Transformer dual-process-based generative adversarial network(CTDPGAN) to fuse infrared and visible *** generator,a dual-process-based module composed by a CNN block and a Swin-Transformer block is *** channel filter and spatial filter in the CNN block has the ability to adaptively extract additional complementary information from images of various modalities while preserving the shallow features of the source *** Swin-Transformer Block(STRB) is designed to establish local attention by dividing non-overlapping windows and then to bridge global attention by interacting *** addition,we introduce generative adversarial learning networks into the training process,the dualchannel transformer discriminators are designed to improve the discriminative ability of the fused ***,the fused image learns the distribution of global contextual information from source images and retain competitive visible light and infrared domains in more balanced ***,we introduce the primary and auxiliary feature concepts into the structural similarity loss function and spatial frequency loss function,which will enable the generator to produce a fused image that retains thermal radiation information and rich detail ***,the experimental findings demonstrate that,in both subjective and objective assessments,our model produces outcomes that are equivalent to or superior compared to state-of-the-art image fusion methods.

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Spectrally resolved Franson interference

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Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 11-17页

作者： Rui-Bo Jin Zi-Qi Zeng Dan Xu Chen-Zhi Yuan Bai-Hong Li You Wang Ryosuke Shimizu Masahiro Takeoka Mikio Fujiwara Masahide Sasaki Pei-Xiang Lu Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205China School of Physics and Information Science Shaanxi University of Science and TechnologyXi'an 710021China Southwest Institute of Technical Physics Chengdu 610041China Graduate School of Informatics and Engineering University of Electro-CommunicationsTokyo 182-8585Japan Department of Electronics and Electrical Engineering Keio UniversityKanagawa 223-8522Japan National Institute of Information and Communications Technology Tokyo 184-8795Japan

Franson interference can be used to test the nonlocal features of energy-time entanglement and has become a standard in quantum ***,most of the previous Franson interference experiments were demonstrated in the time domain,and the spectral properties of Franson interference have not been fully ***,we theoretically and experimentally demonstrate spectrally resolved Franson interference using biphotons with different correlations,including positive correlation,negative correlation,and *** is found that the joint spectral intensities of the biphotons can be modulated along both the signal and idler directions,which has potential applications in generating high-dimensional frequency entanglement and time-frequency grid *** work may provide a new perspective for understanding the spectral-temporal properties of the Franson interferometer.

关键词： resolved correlation spectral

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Development of a toroidal soft x-ray imaging system and application for investigating three-dimensional plasma on J-TEXT

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Plasma Science and Technology 2024年第3期26卷 94-99页

作者：赵传旭李建超张晓卿王能超丁永华杨州军江中和严伟李杨波毛飞越任正康 the J-TEXT Team International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic Engineering and School of PhysicsHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of TechnologyWuhan 430205People's Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China

A toroidal soft x-ray imaging(T-SXRI)system has been developed to investigate threedimensional(3D)plasma physics on *** T-SXRI system consists of three sets of SXR *** sets are newly developed and located on the vacuum chamber wall at toroidal positionsφof 126.4°and 272.6°,respectively,while one set was established previously atφ=*** set of SXR arrays consists of three arrays viewing the plasma poloidally,and hence can be used separately to obtain SXR images via the tomographic *** sawtooth precursor oscillations are measured by T-SXRI,and the corresponding images of perturbative SXR signals are successfully reconstructed at these three toroidal positions,hence providing measurement of the 3D structure of precursor *** observed 3D structure is consistent with the helical structure of the m/n=1/1 *** experimental observation confirms that the T-SXRI system is able to observe 3D structures in the J-TEXT plasma.

关键词： SXR imaging J-TEXT tokamak three-dimensional measurement MHD

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DSTCFuse: A Method based on Dual-cycled Cross-awareness of Structure Tensor for Semantic Segmentation via Infrared and Visible Image Fusion

DSTCFuse: A Method based on Dual-cycled Cross-awareness of S...

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IEEE Computer Society Conference on Computer Vision and Pattern recognition Workshops (CVPRW)

作者： Xuan Li Rongfu Chen Jie Wang Lei Ma Li Cheng Haiwen Yuan School of Electrical and Information Engineering Wuhan Institute of Technology Hubei Key Laboratory of Optical Information and Pattern Recognition

ISBN: (数字)9798350365474

ISBN: (纸本)9798350365481

Multi-modality information fusion can compensate deficiencies of single modality and provide rich scene information for 2D semantic segmentation. However, the inconsistency in the feature space between different modalities may lead to poor presentation of objects and that would affect subsequent segmented effectiveness. The idea of modal transition can reduce the modal differences and avoid biased processing during the fusion process, but it is hard to perfectly retain the contents of the source images. To address these challenges, a fusion method based on dual-cycled cross-awareness of structure tensor is proposed. Firstly, we propose a dual-cycle modality transition network based on cross-awareness consistency to learn the differences in feature space from different modalities. Secondly, a set of globally structure-tensor preserving modules are designed to enhance the capabilities of the network in capturing complementary features and perceiving global modal consistency. Under the joint constraint of globally structure-tensor awareness loss and cross-awareness loss, our network achieves a robust mapping of feature space from visible to pseudo-infrared images without relying on Ground-Truth. Finally, the pseudo-infrared images that inherit the superior qualities of two modalities are fused with the original infrared images directly, which effectively reduces the complexity of fusion. Extensive comparative experiments show that our method outperforms state-of-the-art methods in qualitative and quantitative evaluation.

关键词： Degradation Computer vision Tensors Semantic segmentation Conferences Interference Pattern recognition

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High Sensitivity Temperature Sensor Based on Polymer-Liquid Modified Anti-Resonant Reflecting Guidance in Silica Capillary

SSRN

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SSRN 2022年

作者： Cheng, Wei Liu, Shuhui Niu, Panting Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

A high sensitivity temperature sensor based on polymer and liquid modified anti-resonant reflection principle is proposed. The sensor is made of a section of liquid-filled and UV-curable adhesive coated silica capillary, sandwiched between single mode fibers. The guiding mechanism of the waveguide is affected by both the liquid inside the hollow core, and the adhesive outside the silica cladding. The location of the resonant dips are influenced by the refractive index (RI) of the liquid, while the fringe visibility (resonant strength) is tuned by the both the liquid and the adhesive. By carefully selecting the refractive index value of the infiltrated liquid, and controlling the curing time of the adhesive, sharp resonant dips can be obtained. The sensor exhibits very high temperature sensitivity against temperature. A high sensitivity of 3.369 nm/°C is achieved with an infiltration index of 1.39, in the temperature range from 25 °C to 60 °C and the detection limit is estimated to be 0.04 °C. Moreover, the temperature sensitivity of the sensor is found to be decreasing with the order of resonance. The sensor is easy to fabricate and cost effective, and is applicable in both dry and wet environments. © 2022, The Authors. All rights reserved.

关键词： Temperature sensors

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Laser-assisted two-color two-photon double ionization of helium atoms

Research Square

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Research Square 2021年

作者： Zhu, Zhizhen Liu, Kai Zhang, Xiaofan Li, Ye Wang, Feng Qin, Meiyan Wang, Zhe Liao, Qing Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

Correlated momentum and kinetic energy distributions of two photoelectrons in laser-assisted two-color two-photon double ionization of helium are investigated by numerically solving a one-plus-one dimensional time-dependent Schrödinger equation (TDSE). We find that the weak assisting laser field can act as an energy transferring field, resulting in burst of double ionization. More importantly, the participation of the laser photon into the double ionization reshapes the correlation patterns in the momentum and kinetic energy distributions. The laser photon can be absorbed by any one of the two electrons, providing two channels that induces destructive interference in the correlated momentum and kinetic energy distributions, which is never found in previous work. © 2021, CC BY.

关键词： Photoionization

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Design of mid-infrared entangled photon sources using lithium niobate

arXiv

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arXiv 2022年

作者： Zhu, Jin-Long Zhu, Wen-Xin Shi, Xiao-Tao Zhang, Chen-Tao Hao, Xiangying Yang, Zi-Xiang Jin, Rui-Bo Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China

The mid-infrared (MIR) band entangled photon source is vital for the next generation of quantum communication, quantum imaging, and quantum sensing. However, the current entangled states are mainly prepared in visible or near-infrared bands. It is still lack of high-quality entangled photon sources in the MIR band. In this work, we optimize the poling sequence of lithium niobate to prepare two kinds of typical entangled states, the Hermit-Gaussian state and the comb-like entangled state at 3.2 µm. We have also calculated the photon pair rates and estimated the effect of fabrication resolution in the schemes. Our approach will provide entangled photon sources with excellent performance for the study of quantum information in the MIR band. © 2022, CC BY.

关键词： Quantum communication

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