检索结果-内蒙古大学图书馆

10th Symposium on Novel Optoelectronic detection technology and Applications

作者： Li, Zhaoyang Wang, Shanshan Zhou, Shuhong Zhang, Nansheng Fu, Tao Hao, Qun National Key Laboratory on Near-Surface Detection Beijing100072 China School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Shanghai Aerospace Control Technology Institute Shanghai201109 China School of Opto-Electronic Engineering Changchun University of Science and Technology Changchun130022 China

ISBN: (数字)9781510688155

ISBN: (纸本)9781510688148

Deformable mirrors play a critical role in adaptive optics systems, and as the precision demands of optical systems continue to rise, the accurate detection of deformable mirror shape and performance becomes essential to the overall system's effectiveness. Improved detection methods can significantly enhance the design quality and manufacturing precision of deformable mirrors. In this paper, we introduce a phase measuring deflectmetry that directly measures slope variations to detect the surface deformation of deformable mirrors. To further enhance measurement accuracy, monitoring stations are integrated into the system. We conducted measurements on a 100mm-diameter deformable mirror, and through comparisons of simulation and experimental results, we verified that the system provides high measurement accuracy and real-time monitoring of dynamic error influences. This system is well-suited for long-term monitoring of surface changes in deformable mirrors. © 2025 SPIE.

关键词： Adaptive optics

来源：评论

学校读者我要写书评

暂无评论

Infrared Tiny Structureless Object detection Enhanced By Video Super-resolution

引用

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 Ministry of Education of China Key Laboratory of Photo-electronic Imaging Technology and System 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 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 demonstrate that our method has achieved state-of-the-art performance in the task of IR tiny target detection, with an F1 score of 0.957, an accuracy of 99.2%, and a recall rate of 92.4% on the SIATD dataset, outperforming the state-of-the-art by 2%. Furthermore, ablation studies confirm the significant contribution of super-resolution techniques in enhancing the performance of infrared tiny target detection. © 2013 IEEE.

关键词： Image resolution

来源：评论

学校读者我要写书评

暂无评论

Orbital angular momentum spectrum diagnostic from a powermeter

引用

Optics Letters 2025年第11期50卷 3784-3787页

作者： Ruitao Lu Chunqing Gao Shiyao Fu School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China Key Laboratory of Information Photonics Technology Ministry of Industry and Information Technology of the People’s Republic of China Beijing 100081 China Key Laboratory of Photoelectronic Imaging Technology and System Ministry of Education of the People’s Republic of China Beijing 100081 China National Key Laboratory on Near-Surface Detection Beijing 100072 China

Orbital angular momentum (OAM) spectrum is one of the identity characteristics of laser beams and determines the performance of OAM based advanced applications. Therefore, diagnosing the OAM spectrum of a beam is of great significance. In this Letter, we show that a common commercial powermeter, rather than an array detector such as the charge coupled device, can be employed to accurately measure OAM spectra for beams. In our proposal, a series of probe single OAM modes are introduced to interfere with the incident beam to be measured. Then, a power value sequence is measured through a powermeter. Finally, the OAM spectrum is acquired by analyzing the power value sequence. The favorable experimental results illustrate the effectiveness of our proposal, where the OAM spectra of both single-mode and multiplexed OAM beams are well diagnosed. This work provides a new, to the best of our knowledge, insight of the OAM spectrum diagnostics and is expected to reduce the cost of the measuring system, thereby facilitating the widespread and advanced application of OAM.

关键词： Charge-coupled devices Diffractive optical elements Laser beams Orbital angular momentum multiplexing Spatial light modulators Vertical cavity surface emitting lasers

来源：评论

学校读者我要写书评

暂无评论

Microstructural analysis and nonlinear optical properties of PP/PA6/Clay composites: a comparative study with and without compatibilizer

引用

Optical and Quantum Electronics 2025年第5期57卷 1-27页

作者： Orshesh, Z. Dehghani, Z. Moghaddasi, M. Bagheri, R. Abrinaei, F. Department of Materials Science and Engineering Ahvaz Branch Islamic Azad University Ahvaz Iran Department of Materials Science and Engineering Central Tehran Branch Islamic Azad University Tehran Iran Department of Physics University of Neyshabur P. O. Box *** Neyshabur Iran National Key Laboratory on Near-Surface Detection School of Optics and Photonics Beijing Institute of Technology Beijing100081 China Department of Materials Science and Engineering Sharif University of Technology P. O. Box 11365-9466 Tehran Iran Department of Physics Central Tehran Branch Islamic Azad University Tehran Iran Department of Physics East Tehran Branch Islamic Azad University Tehran Iran

Ternary polypropylene/polyamide6/organoclay composites were successfully synthesized through a melt-mixing process, with and without a compatibilizer. The chemical-bond, structural, and morphological characteristics of composites were thoroughly investigated utilizing Fourier-transform infrared spectroscopy, wide-angle X-ray diffraction, and scanning electron microscopy analyses. The morphological investigations showed that the addition of a compatibilizer to the composite leads to a reduction in the size of the dispersed PA6/clay domains and a decrease in the distance between them due to the formation of a PP-g-PA copolymer at the interface, which improves compatibility between the PP and PA6 phases. Furthermore, the differential scanning calorimetry technique was employed to assess the crystallization and thermal action of the composites. The results revealed that the addition of a compatibilizer resulted in a slight increase in the crystallization temperature of PP and a reduction in the overall crystallinity of the composite, attributed to the compatibilizer’s interaction with both the clay and PA6/clay islands, limiting PP chain mobility and hindering crystallization. The band gap energies were determined in a range of 4.17–4.34 eV by diffuse reflectance spectroscopy and utilizing the Tauc method. Notably, this study marks the first instance of exploring the nonlinear optical properties of these composites. This was achieved by employing Z-scan technique by subjecting the samples to a continuous-wave Nd:YAG laser functioning at a wavelength of 532 nm. A positive nonlinearity of the order of 10–8 cm2W−1 was observed across all samples studied. Particularly noteworthy was the significant enhancement in nonlinear refractive index and absorption coefficients for polypropylene/polyamide6/organoclay ternary composites upon the addition of the compatibilizer. These findings strongly indicate the potential of these composites for applications in nonlinear optical devic

关键词： Fourier transform infrared spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Cavity-enhanced infrared quantum dot homojunction arrays

引用

Photonics Research 2025年第6期13卷 1497-1509页

作者： Naiquan Yan Feng Shi Xiaomeng Xue Kenan Zhang Cheng Huo Menglu Chen School of Optics and Photonics Beijing Institute of Technology Beijing 100081 China Zhejiang Key Laboratory of 3D Micro/Nano Fabrication and Characterization Westlake Institute for Optoelectronics Hangzhou 311421 China Laboratory of Science and Technology on Integrated Logistics Support Changsha 410073 China State Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China National Key Laboratory on Near-Surface Detection Beijing 100012 China

Infrared spectroscopy has wide applications in the medical field, industry, agriculture, and other areas. Although the traditional infrared spectrometers are well developed, they face the challenge of miniaturization and cost reduction. Advances in nanomaterials and nanotechnology offer new methods for miniaturizing spectrometers. However, most research on nanomaterial-based spectrometers is limited to the visible wavelength or near infrared region. Here, we propose an infrared spectrometer based on diffraction gratings and colloidal quantum dot (CQD) homojunction photodetector arrays. Coupled with a Fabry-Perot cavity, the CQD photodetector covers the 1.4–2.5 μm spectral range, with specific detectivity 4.64 × 10 11 Jones at 2.5 μm at room temperature. The assembled spectrometer has 256 channels, with total area 2.8 mm × 40 mm . By optimizing the response matrix from machine learning algorithms, the CQD spectrometer shows high-resolution spectral reconstruction with a resolution of approximately 7 nm covering the short-wave infrared.

关键词： Detector arrays Diffraction gratings Fourier transform infrared spectroscopy Imaging systems Medical fields near infrared

来源：评论

学校读者我要写书评

暂无评论

Intelligent tailoring of a broadband orbital angular momentum comb towards efficient optical convolution

引用

Photonics Research 2025年第05期 1148-1157页

作者： SHIYUN ZHOU LANG LI YISHU WANG LILIANG GAO ZHICHAO ZHANG CHUNQING GAO SHIYAO FU School of Optics and Photonics Beijing Institute of Technology Key Laboratory of Photoelectronic Imaging Technology and System Ministry of Education Key Laboratory of Information Photonics Technology Ministry of Industry and Information Technology National Key Laboratory on Near-surface Detection

Due to the high-dimensional characteristics of photon orbital angular momentum (OAM), a beam can carry multiple OAMs simultaneously thus forming an OAM comb, which has been proved to show significant potential in both classical and quantum photonics. Tailoring broadband OAM combs on demand in a fast and accurate manner is a crucial basis for their application in advanced scenarios. However, obtaining phase-only gratings for the generation of arbitrary desired OAM combs still poses challenges. In this paper, we propose a multi-scale fusion learning U-shaped neural network that encodes a phase-only hologram for tailoring broadband OAM combs on-demand. Proof-of-principle experiments demonstrate that our scheme achieves fast computational speed, high modulation precision, and high manipulation dimensionality, with a mode range of-75 to+75,an average root mean square error of 0.0037, and a fidelity of 85.01%, all achieved in about 30 ***, we utilize the tailored broadband OAM combs in conducting optical convolution calculation,enabling vector convolution for arbitrary discrete functions, showcasing the extended capability of our *** work opens, to our knowledge, new insight for on-demand tailoring of broadband OAM combs, paving the way for further advancements in high-dimensional OAM-based applications.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Candidate Evaluation with Multimodal Data-Driven for Recruitment 27th

Candidate Evaluation with Multimodal Data-Driven for Recru...

引用

27th International Conference on Pattern Recognition, ICPR 2024

作者： Wu, Xing Liu, Kehong Wang, Jianjia Yao, Junfeng Deng, Bin Lv, Rongqi Song, Jun School of Computer Engineering and Science Shanghai University Shanghai200444 China Shanghai Institute for Advanced Communication and Data Science Shanghai University Shanghai200444 China School of AI and Advanced Computing XJTLU Entrepreneur College Xi’an Jiaotong-Liverpool University Suzhou215412 China CSSC Seago System Technology Co. Ltd. Shanghai200010 China Science and Technology on Near-Surface Detection Laboratory Jangsu Wuxi214035 China Department of Geography Hong Kong Baptist University 999077 Hong Kong

ISBN: (纸本)9783031781858

In the field of intelligent recruitment, automated resume matching and non-contact interviews have significantly improved the efficiency of companies in finding suitable candidates. This corresponds to the techniques of person-job matching and AI interviews. However, current person-job matching methods lack substantial data support, while AI interview methods struggle to integrate deep information from multimodal data and provide comprehensive evaluations of candidates’ responses. To address these challenges, we propose a multimodal data-driven person-job evaluation model, comprising two key stages: a person-job matching method based on graph attention and a multimodal AI interview method. Using a dual-perspective graph neural network approach, we accomplish the screening of candidates and positions. In the second stage, we conduct a comprehensive evaluation of candidates’ interview performance based on text, audio, and image modalities, providing a more objective, consistent, and efficient interview assessment method. Experimental results demonstrate that our person-job matching method surpasses current popular techniques and effectively transfers features to the next stage. In our multimodal AI interview method, we achieve accurate scoring of candidate responses, assessment of intonation stress levels, and inference of their Big Five personality traits, comprehensively evaluating candidates from multiple perspectives. This confirms the superiority and efficiency of our approach. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Graph neural networks

来源：评论

学校读者我要写书评

暂无评论

High-power 70 fs Yb:KGW oscillator with enhanced intracavity kerr-effect nonlinearity

引用

Optics and Laser technology 2025年 190卷

作者： Wang, Ruiqi Yang, Fan Wang, Qing Liang, Qiuyu Gao, Mingwei Zhang, Jinwei School of Optics and Photonics Beijing Institute of Technology Beijing100081 China National Key Laboratory on Near-Surface Detection Beijing100072 China Key Laboratory of Photonics Information Technology Ministry of Industry and Information Technology Beijing100081 China School of Optical and Electronic Information and Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Hubei Wuhan430074 China

We demonstrated a high-power, diode-pumped Yb:KGW Kerr-lens mode-locked laser featuring an intracavity Kerr-mirror configuration. The resonator is terminated with a coated YAG crystal serving as the nonlinear Kerr-mirror, which significantly enhances self-phase modulation. This configuration enables the generation of 80.5-fs pulses at 5.72 W output power at the central wavelength of ∼1030 nm, with further Kerr-effect nonlinearity optimization yielding 70.3-fs pulses at 5.06 W output power and a maximum broadening spectral width of up to 20.5 nm. Notably, this represents the first Yb:KGW Kerr-lens mode locked oscillator to exceed 5 W of output power while sustaining sub-100 fs pulse durations. This proposed Kerr-mirror-mediated approach establishes a new regime in ultrafast oscillator design, enabling the enhancement of power-scaling to multi-watt levels while delivering pulses of reduced duration. © 2025

关键词： Self phase modulation

来源：评论

学校读者我要写书评

暂无评论

Root inspired in situ interlocked interface for strength and ductility combination of refractory high-entropy alloys/Ni composites by activated sintering

引用

Materials science and Engineering: A 2025年 939卷

作者： Yang, Xiao Yang, De Huang, Hai Wang, Shubang Zhang, Zehai Liang, Zhimin Wang, Liwei Peng, Zhenzhen Liu, Ying Wang, Dianlong Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and Engineering Hebei University of Science and Technology Shijiazhuang050018 China School of Materials Science and Engineering East China Jiaotong University Nanchang330013 China Key Laboratory of Superlight Material and Surface Technology Ministy of Education College of Materials Science and Chemical Engineering Harbin Engineering University Harbin150001 China School of Mechanical Engineering Yanshan University Qinhuangdao066004 China

This work proposed a simple bionic-inspired strategy to in situ construct a root-like interfacial interlocked structure in the refractory high-entropy alloys (RHEA) particle-reinforced Ni matrix composites by activated sintering. The results showed that at the RHEA-Ni interface, Ni element preferred to aggregate inside the RHEA near the interface by grain boundaries (GBs) wetting and far away from the interface by GBs prewetting. Subsequently, the Ni-rich liquid-like film crystallized into Ni3(Ta, Nb), Ni2(Ta, Nb) phases due to relatively low Gibbs free energy change (ΔG) and high diffusion rate, in situ forming root-like interlocked structure anchored on the RHEA particle. At the root-like interlocked interface, the Ni-Ta intermetallic compounds (IMCs) and BCC phase, serving as alternating hard and soft oriented phases, enhance the interlocked interface hardness and elastic modulus. The finite element method proved that the root-like interlocked structure reduced the demand for interfacial reaction layer strength and the degree of interfacial stress concentration. Compared to the pure Ni bulk, the 10 vol% RHEA/Ni composite obtains 41.8 % and 93.4 % in ultimate tensile strength (UTS) to 509 MPa and yield strength (YS) to 205 MPa, respectively, while maintaining an acceptable elongation of 15.8 %. This work offers a novel approach to in situ synthesize the bionic configuration interface structure for the enhanced interfacial bonding and optimized interfacial stress distribution of the Ni matrix composites. © 2025 Elsevier B.V.

关键词： Tensile strength

来源：评论

学校读者我要写书评

暂无评论

Sound event localization and detection based on deep learning

引用

Journal of Systems Engineering and Electronics 2024年第2期35卷 294-301页

作者： ZHAO Dada DING Kai QI Xiaogang CHEN Yu FENG Hailin School of Mathematics and Statistics Xidian UniversityXi’an 710071China Science and Technology on Near-Surface Detection Laboratory Wuxi 214035China

Acoustic source localization(ASL)and sound event detection(SED)are two widely pursued independent research *** recent years,in order to achieve a more complete spatial and temporal representation of sound field,sound event localization and detection(SELD)has become a very active research *** paper presents a deep learning-based multioverlapping sound event localization and detection algorithm in three-dimensional ***-Mel spectrum and generalized cross-correlation spectrum are joined together in channel dimension as input *** features are classified and regressed in parallel after training by a neural network to obtain sound recognition and localization results *** channel attention mechanism is also introduced in the network to selectively enhance the features containing essential information and suppress the useless ***,a thourough comparison confirms the efficiency and effectiveness of the proposed SELD *** experiments show that the proposed algorithm is robust to reverberation and environment and can achieve higher recognition and localization accuracy compared with the baseline method.

关键词： sound event localization and detection(SELD) deep learning convolutional recursive neural network(CRNN) channel attention mechanism

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：