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International Conference on information Science and Control Engineering (ICISCE)

作者： Peng Wang Jinmeng Wu Guilin Yan Shuo Bian Hubei Key Laboratory of Optical Information and Pattern Recognition Hubei Research Centre of Video Image and High Definition Projection Wuhan Institute of Technology Wuhan China School of Mechanical and Electrical Engineering School of Electrical and Information Engineering

In the mobile phone glass industry, curved glass is widely used. Whether the curved glass is measured with high efficiency and precision and whether the curved edge profile error can be evaluated directly affects the quality and service cycle of glass products. In view of the difficulty of accurate measurement and evaluation of 3D mobile phones curved glass profile, a visual measurement method of 3D mobile phones curved glass profile error based on laser scanning and shape template matching is proposed in this paper. Accurate measurement of mobile phone curved glass greatly improves the fit between curved glass and mobile phone and the efficiency of production. Therefore, this paper proposes a method for evaluating the contour degree of curved glass on mobile phones based on Open Cascade and OpenCV. This method uses the lasers and camera equipment to extract the profile outline of the curved glass, then extract the profile outline of the mobile phone curved glass model that has been drawn in 3D software. The extracted contour lines are matched by methods such as translation and rotation, and finally the distance between the corresponding points is calculated as the contour error. Experimental results show that the method is able to accurately measure the profile error and greatly reduce the measurement instability and have good robustness.

关键词： Computer vision Three-dimensional displays Shape Shape measurement Measurement uncertainty Measurement by laser beam Glass

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Identification and Extraction of Circular Markers in 3D Reconstruction

Identification and Extraction of Circular Markers in 3D Reco...

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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Yunfei Wang Hanyu Hong Jinmeng Wu Guangya Wang Shiyang Li Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan China Hubei Engineering Research Center of Video Image and HD Projection Wuhan China School of Electrical and Information Engineering Wuhan Institute of Technology Wuhan China

ISBN: (数字)9781728172361

ISBN: (纸本)9781728172378

This paper presents a method for the identification and location of circular markers in 3D reconstruction. The input image is processed with gray scale and gaussian filter to remove noise interference and improve the accuracy of edge detection. The size and direction of the gradient of the image were calculated to obtain the edge features of the circular marker, and the circle degree of the closed edge was judged, and the center of the marker was obtained by fitting the edge features with the ellipse of the least square method. Hu moment similarity of each marker was obtained, and the non-marker was deleted and the real marker was retained by similarity judgment. Experiments show that the algorithm has good robustness, high precision, can effectively reduce the probability of false detection, and has high accuracy in complex environments.

关键词： Image edge detection Transforms Three-dimensional displays Fitting Feature extraction Cameras Least mean squares methods

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Determination of Electron Band Structure using Temporal Interferometry

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Physical Review Letters 2020年第15期124卷 157403-157403页

作者： Liang Li Pengfei Lan Lixin He Wei Cao Qingbin Zhang Peixiang Lu Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China CAS Center for Excellence in Ultraintense Laser Science Shanghai 201800 China

We propose an all-optical method to directly reconstruct the band structure of semiconductors. Our scheme is based on the temporal Young’s interferometer realized by high harmonic generation with a few-cycle laser pulse. As a time-energy domain interferometer, temporal interference encodes the band structure into the fringe in the energy domain. The relation between the band structure and the emitted harmonic frequencies is established. This enables us to retrieve the band structure from the spectrum of high harmonic generation with a single-shot measurement. Our scheme paves the way to study matters under ambient conditions and to track the ultrafast modification of band structures.

关键词： Band gap Electronic structure Nonlinear optics Ultrafast phenomena Semiconductors Band structure methods optical absorption spectroscopy

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Synthesis, Structure and Elastic Properties of a New Hybrid Perovskite Material: [C₆H₁₄N₂]KBr₃①

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结构化学 2020年第1期

作者： Muhammad Azeem ZHANG Hong JI Li-Jun DONG Li-Yuan LU Pei-Xiang LI Wei School of Physics and Wuhan National Laboratory for Optoelectronics Hubei Key Laboratory of Optical Information and Pattern Recognition School of Materials Science and Engineering

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Photoelectron ionization time of aligned molecules clocked by attosecond angular streaking

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Physical Review A 2020年第1期102卷 013117-013117页

作者： Jiaqing Yan Wenhai Xie Min Li Kun Liu Siqiang Luo Chuanpeng Cao keyu Guo Wei Cao Pengfei Lan Qingbin Zhang Yueming Zhou Peixiang Lu Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan 430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800 China

Attoclock is a powerful technique to resolve laser-driven electron dynamics on an attosecond time scale. Previously, it was mainly limited to atomic targets. Here we apply the attoclock technique to aligned molecules to study the subcycle ionization dynamics. By controlling the alignment of the molecule relative to the major axis of a strong elliptically polarized laser field, we demonstrate that the electron ionization time in aligned molecules can be precisely resolved by the attoclock technique. We find that the ionization time corresponding to the peak of the photoelectron momentum distribution shifts several tens of attoseconds relative to the laser field peak depending on the molecular orientation and molecular orbital structure. A significant difference between the measurement and molecular Ammosov-Delone-Krainov model is found. We further show that the photoelectron ionization time of molecules is sensitive to angular-dependent ionization rate, opening up opportunities for probing attosecond electron dynamics in complex polyatomic molecules.

关键词： Multiphoton or tunneling ionization & excitation Photoemission Ultrafast phenomena

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A High-Frequency Sound based PGC Demodulation Scheme for Fiber Optics Hydrophone

Research Square

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Research Square 2021年

作者： Shi, Yunjie Yin, Mengke Zhu, Zijue Wang, Shun Niu, Panting Dong, Yuming Zhang, Liang Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen518055 China School of Civil and Environmental Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Schools of Science Changchun University of Science and Technology Changchun130022 China

In the research field of fiber-optic hydrophone, the performance of demodulation scheme is crucial. In this work, a phase-generated-carrier (PGC) demodulation scheme based on high-frequency sound source is proposed. High-frequency acoustic signal from the external sound source is applied to the fiber-optic hydrophone to achieve phase modulation of the interference signal instead of the piezo-electrical transducer (PZT) or frequency-modulated laser. It possesses the merits of low system complexity and low cost. Through the acoustic detection experiment, we achieve demodulation of acoustic signal at frequency varying from 300 Hz to 800 Hz, and the signal-to-noise ratio (SNR) is higher than 45 dB. Furthermore, the proposed scheme is successfully applied to time division multiplexing (TDM) experiment. © 2021, CC BY.

关键词： Phase modulation

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Fiber Bragg grating in seven core fiber fabricated with infrared femtosecond laser pulses and a phase mask

Fiber Bragg grating in seven core fiber fabricated with infr...

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International Conference on optical Communications and Networks (ICOCN)

作者： Shuhui Liu Shun Wang Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan China

Fibre Bragg grating (FBG) is inscribed into a seven core optical fibre by use of femtosecond laser side illumination. Multiple peaks in the reflection and transmission spectrum are observed, which result from the Bragg resonance of the core mode and cladding mode by phase match condition. The grating spectra exhibit linear response to rising temperature, and a sensitivity of 12 pm/°C is achieved between room temperature and 1000°C. Such a Bragg grating is promising to find applications in harsh environments.

关键词： Fiber gratings optical fibers optical fiber cables optical fiber networks Temperature sensors

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Temperature sensor based on selective liquid-filled twin-core photonic crystal fiber 6

Temperature sensor based on selective liquid-filled twin-cor...

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optical Sensing and Detection VI 2020

作者： Wang, Chenlu Shum, Perry Ping Hu, Dora Juan Juan Xu, Zhilin Liu, Shuhui Zhu, Yongwei Zheng, Yu Li, Baocheng Chen, Yang Tong, Weijun Meng, Yue Humbert, Georges Cintra CNRS/NTU/THALES Umi 3288 Singapore639798 Singapore School of Electrical and Electronic Engineering Nanyang Technological University Singapore639798 Singapore Institute for Infocomm Research Astar Singapore Singapore Moe Key Laboratory of Fundamental Physical Quantities Measurement Hubei Key Laboratory of Gravitation and Quantum Physics Pgmf School of Physics Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan430205 China Yangtze Optical Fibre and Cable Joint Stock Limited Company China Xlim Research Institute Umr Cnrs University of Limoges 123 av. A. Thomas Limoges87060 France

ISBN: (纸本)9781510634800

We experimentally demonstrated a temperature sensor by selectively infiltrating refractive index liquid (RIL) in the central air hole of a twin-core photonic crystal fiber (PCF). The selective liquid infiltration was realized by putting the PCF in the bulk liquid with its central air hole open for liquid infiltration using capillary effect. The rest of the air holes were covered by UV glue. The three-dimensional stage was used to translate the PCF, and a tapered SMF was used to transfer the UV glue to cover the air holes under the microscope. After UV glue was solidified by exposing the fiber end under the UV light, the PCF end was dipped into the RIL to fill the central air hole by capillary effect. Due to the large thermos-optic coefficient of the RIL, the RIL filled air channel would act as a liquid core whose core modes would be highly dependent on the ambient temperature. The core modes of the RIL filled core would be phase matched to the fundamental mode of the two solid cores. Therefore, the phase matching wavelengths for the mode coupling among the two solid cores of PCF and the liquid core were highly temperature sensitive. The resonant dips in the transmission spectrum were measured to estimate the temperature sensitivity. The experiment used a commercially available twin core PCF, and blocked all but the central airhole at one of the ends facets by UV glue (NOA81, Norland), the remaining open holes are infiltrated over a length of 10 cm by capillary force with fluid (Cargille Laboratories Inc. index-matching fluid, series A) that possesses a refractive index of 1.46 at 589.3nm, 25°C, and the thermal coefficient is - 0.000389 RIU/°C, which is around 10 times of that coefficient of silica. Any temperature induced changes will have an influence on the propagation properties because of the highly temperature response of the refractive index of the fluid. With a fiber cleaver, a 1.8 cm long PCF was then cut from the longer length of the partially liquid filled

关键词： Photonic crystal fibers

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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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Elliptical isolated attosecond-pulse generation from an atom in a linear laser field

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Physical Review A 2020年第3期102卷 033103-033103页

作者： Xiaofan Zhang Xiaosong Zhu Xi Liu Feng Wang Meiyan Qin Qing Liao Peixiang Lu Hubei Key Laboratory of Optical Information and Pattern Recognition Wuhan Institute of Technology Wuhan 430205 China Wuhan National Laboratory for Optoelectronics and School of Physics Huazhong University of Science and Technology Wuhan 430074 China School of Physics and New Energy Xuzhou University of Technology Xuzhou 221018 China Guangdong Intelligent Robotics Institute Dongguan 523808 China

We theoretically demonstrate a scheme to produce elliptically polarized isolated attosecond pulses, based on the high-order harmonic generation from the current-carrying state of an atom exposed in linearly polarized laser fields. It is shown that the nonzero ellipticity of the attosecond pulse generated at the single-atom level is attributed to the nonvanishing angular momentum of the state, which is further elucidated by the strong-field approximation model. With specific carrier envelope phases (CEPs), isolated attosecond pulses with large ellipticity can be obtained. Moreover, the ellipticity of high-order harmonics remains almost invariable versus the CEP of the few-cycle driving field. Hence, the temporal profile and ellipticity of the attosecond-pulse radiation can be manipulated separately, which is beneficial to shape the attosecond-pulse radiation without compromising the ellipticity. The obtained elliptical attosecond pulse may serve as a potential tool to explore and manipulate the ultrafast dynamics in magnetic materials and chiral media.

关键词： Atomic & molecular processes in external fields High-order harmonic generation Ultrafast phenomena

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