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

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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Performance enhancement of solution-processed InZnO thin-film transistors by Al doping and surface passivation

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Journal of Semiconductors 2022年第3期43卷 94-103页

作者： Wensi Cai Haiyun Li Mengchao Li Zhigang Zang Key Laboratory of Optoelectronic Technology&System(Ministry of Education) Chongqing UniversityChongqing 400044China

Solution-processed oxide semiconductors have been considered as a potential alternative to vacuum-based ones in printable ***,despite spincoated InZnO(IZO)thin-film transistors(TFTs)have shown a relatively high mobil-ity,the lack of carrier suppressor and the high sensitivity to oxygen and water molecules in ambient air make them potentially suffer issues of poor *** this work,Al is used as the third cation doping element to study the effects on the electrical,optoelectronic,and physical properties of IZO TFTs.A hydrophobic self-assembled monolayer called octadecyltrimethoxysilane is introduced as the surface passivation layer,aiming to reduce the effects from air and understand the importance of top surface conditions in solution-processed,ultra-thin oxide *** to the reduced trap states within the film and at the top surface enabled by the doping and passivation,the optimized TFTs show an increased current on/off ratio,a reduced drain current hysteresis,and a significantly enhanced bias stress stability,compared with the untreated *** combining with high-capacitance AlO_(x),TFTs with a low operating voltage of 1.5 V,a current on/off ratio of>10^(4) and a mobility of 4.6 cm^(2)/(V·s)are demonstrated,suggesting the promising features for future low-cost,low-power electronics.

关键词： thin-film transistors oxide semiconductors Al doping surface passivation

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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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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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Algorithm for de-scattering 3D images from infrared time-of-flight(ToF) cameras

Algorithm for de-scattering 3D images from infrared time-of-...

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2023 Advanced Fiber Laser Conference, AFL 2023

作者： Lu, Taoran Qiu, Su Wang, Hui Key Laboratory of Optoelectronic Imaging Technology and System of the Ministry of Education Beijing Institute of Technolog Beijing100081 China

ISBN: (纸本)9781510677661

An algorithm for mitigating the interference of scattering media in Time of Flight (ToF) cameras during imaging is proposed. This algorithm addresses the issues of decreased image quality, reduced contrast, and loss of depth information. The method is based on atmospheric background light prior knowledge and outlier handling. Firstly, a threshold segmentation is applied to the depth histogram of the image to eliminate the interference of backscattered light. Secondly, an image restoration algorithm based on the atmospheric background light prior is used to remove interference from the image. Finally, outliers in the restored image are removed to obtain the final processed image. Experimental results show that the proposed algorithm improves the peak signal-To-noise ratio, structural similarity, image information entropy, and the number of matched feature points by an average of 9.21 dB, 10.02%, 0.83, and 12, respectively, compared to the original algorithm. This validates the effectiveness and superiority of the proposed algorithm. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Cameras

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Reconstruction of high-resolution depth profiling from single-photon data based on PCA 7

Reconstruction of high-resolution depth profiling from singl...

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Real-time Photonic Measurements, Data Management, and Processing VII 2023

作者： Wang, Hui Qiu, Su Lu, Taoran MOE Key Laboratory of Optoelectronic Imaging Technology and System Beijing Institute of Technology Beijing China

ISBN: (纸本)9781510667938

The high sensitivity and picosecond temporal resolution of single-photon avalanche diode (SPAD) make it the preferred single-photon detector in extreme imaging environments. Extreme imaging environments (e.g., underwater high-scattering environments) usually result in low signal-to-noise ratios of the acquired single-photon data, which leads to poor quality of image reconstruction, so it is necessary to propose a high-resolution single-photon three-dimensional reconstruction algorithm for extreme imaging environments. Principal component analysis (PCA) is widely used and robust, which is suitable for dimensionality reduction and noise reduction processing of single-photon data with sparse and noisy characteristics. Under the premise that the target data has a strong correlation with the background and random noise, the target feature extraction of the single-photon data is carried out by PCA, the principal components are used to reconstruct the original data, the relative position and size of the original data are effectively retained, the redundant information is removed, and the single-photon data is reconstructed using cross-correlation and ManiPoP algorithms to achieve high-resolution single-photon depth profile reconstruction. © 2023 SPIE.

关键词： Principal component analysis

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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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Orthogonal Translation Computed Laminography Aliasing Artifacts Elimination via Adaptive L0 Gradient Minimization

Orthogonal Translation Computed Laminography Aliasing Artifa...

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2024 Academic Conference of China Instrument and Control Society, ACCIS 2024

作者： Tan, Chuandong Zhong, Guowei Lin, Xinxin Li, Qi Zou, Hao Duan, Liming Engineering Research Center of Industrial Computed Tomography Nondestructive Testing Key Laboratory of Optoelectronic Technology and System Chongqing China

ISBN: (纸本)9798350350326

Orthogonal translation computed laminography (OTCL) focuses on non-destructive testing of plate-like objects in the thickness direction, which can obtain higher geometric magnification than computed tomography (CT). However, the structure of OTCL scanning mode will lead to incomplete projection data, resulting in aliasing artifacts in the reconstructed images. To suppress aliasing artifacts, this paper proposed an adaptive gradient L0 minimization aliasing artifacts suppression method for computed laminography filtered backprojection (CLFBP) algorithm reconstructed images, named CLFBP-LO. Firstly, the CLFBP algorithm is used to reconstruct images from OTCL projection data. Secondly, the gradient L0 minimization parameter is adaptively set via the clarity of the image, thereby eliminating aliasing artifacts. The experimental results show that the proposed CLFBP-LO method can effectively eliminate aliasing artifacts and avoid images over smooth. © 2024 IEEE.

关键词： Computerized tomography

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