International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference最新文献_第6页

The gamut expansion of laser display 激光显示的色域扩展

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2586768

Wenping Zhang, Shuo Zhang, Weinan Gao, T. Fang, Minyuan Sun, Dongdong Wang, Yuan Yuan, Y. Bi

引用次数: 0

Graphene-coated terahertz photonic crystal fiber for refractive index sensor applications 用于折射率传感器的石墨烯涂层太赫兹光子晶体光纤

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2586728

Chenyu Guo, Doudou Wang, Jiaoxia Wei, Yue Zhang

{"title":"Graphene-coated terahertz photonic crystal fiber for refractive index sensor applications","authors":"Chenyu Guo, Doudou Wang, Jiaoxia Wei, Yue Zhang","doi":"10.1117/12.2586728","DOIUrl":"https://doi.org/10.1117/12.2586728","url":null,"abstract":"A graphene-coated terahertz photonic crystal fiber (G-PCF) for refractive index (RI) sensing is proposed and numerically simulated by the finite element method (FEM). To enhance the sensitivity and produce birefringence, two larger air-holes are introduced in the innermost ring of holes around the solid core. Inner surface of the larger air-holes is coated with multilayer graphene and used for analyte filling. The guided modes of the designed G-PCF are distributed mainly in the larger air-holes as a result of the high permittivity and carrier mobility of graphene. The relative sensitivity coefficient can be improved more than 5 times by introducing the graphene coating for analytes with a RI in the range of 1.00 to 1.50. The highest relative sensitivity coefficient about 90% is obtained when RI is equal to 1.37. The relative sensitivity coefficient can be improved more than 15 times with RI equals to 1.03. The propagation properties and RI sensitivities of the G-PCF can be electrically and thermally controlled. Our results provide references for RI sensor applications of the designed GPCF in terahertz range.","PeriodicalId":370739,"journal":{"name":"International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116267743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hyperspectral image classification using 3D-2D CNN with multi-scale information extraction and fusion module 采用3D-2D CNN多尺度信息提取融合模块进行高光谱图像分类

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2586803

Hang Gong, Tingkui Mu, Qiuxia Li, Feng Han, Abudusalamu Tuniyazi, Haoyang Li, Wenjing Wang, Zhiping He, Chunlai Li, H. Dai

{"title":"Hyperspectral image classification using 3D-2D CNN with multi-scale information extraction and fusion module","authors":"Hang Gong, Tingkui Mu, Qiuxia Li, Feng Han, Abudusalamu Tuniyazi, Haoyang Li, Wenjing Wang, Zhiping He, Chunlai Li, H. Dai","doi":"10.1117/12.2586803","DOIUrl":"https://doi.org/10.1117/12.2586803","url":null,"abstract":"Classification is the focus and difficulty of hyperspectral imaging technology. Hyperspectral data have twodimensional spatial information and one-dimensional spectral information, which are presented as three-dimensional data blocks with large amount of information, meanwhile high-dimension, high nonlinearity and limited training samples bring great challenges. Deep learning can extract and analyze the features of target data step by step by building multi-layer deep nonlinear structure. The advanced feature, multi scale abstract information extracted by convolution neural network applied to image processing can improve the classification accuracy of complex hyperspectral data. We regard pixel level hyperspectral classification as semantic segmentation network, and creatively introduce squeeze-and-excitation network and pyramid pooling network into hyperspectral classification network and proposed a model based on the structure of 2D-3D hybrid convolution neural network, it can learn deeper spatial spectral features and fusion to improve the accuracy and speed of hyperspectral classification.","PeriodicalId":370739,"journal":{"name":"International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121903081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Absorber for measuring the transmission of a polycapillary focusing optical lens 用于测量多毛细聚焦光学透镜透射率的吸收器

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2584898

Haoran Wang, P. Zhou, Shuang Zhang, Zhiguo Liu

引用次数: 1

Distributed Bragg reflector lasers emitting around 2.3μm 分布布拉格反射激光器发射约2.3μm

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2586587

Chengao Yang, Yi Zhang, Jin-ming Shang, Yi-hang Chen, Tian-fang Wang, X. Su, Sen-sen Li, H. Ni, Yu Zhang, Ying-qiang Xu, Z. Niu

引用次数: 0

Hyperspectral image change detection using two-branch Unet network with feature fusion 基于特征融合的双分支Unet网络高光谱图像变化检测

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2586808

Qiuxia Li, Tingkui Mu, Yusen Feng, Hang Gong, Feng Han, Abudusalamu Tuniyazi, Haoyang Li, Wenjing Wang, Chunlai Li, Zhiping He, H. Dai

{"title":"Hyperspectral image change detection using two-branch Unet network with feature fusion","authors":"Qiuxia Li, Tingkui Mu, Yusen Feng, Hang Gong, Feng Han, Abudusalamu Tuniyazi, Haoyang Li, Wenjing Wang, Chunlai Li, Zhiping He, H. Dai","doi":"10.1117/12.2586808","DOIUrl":"https://doi.org/10.1117/12.2586808","url":null,"abstract":"Change detection (CD) is the process of identifying differences in the state of an object or phenomenon by observing it at different times. CD is one of the earliest and most important applications of remote sensing technology. The hyperspectral image (HSI) of remote sensing satellite provides an important and unique data source for CD, but its high dimension, noise and limited data set make the task of CD very challenging. Traditional algorithms are no longer suitable for hyperspectral data processing. Recently, the success of deep convolutional neural networks (CNN) has widely spread across the whole field of computer vision for their powerful representation abilities. Therefore, this paper combines traditional algorithms and deep learning techniques to solve the CD task of hyperspectral remote sensing images. The proposed two-branch Unet network with feature fusion (Unet-ff) model in this paper uses neural networks to automatically extract features to achieve end-to-end change information detection. In order to improve the degree of automation in the application, we select the most effective results as the training sample for the neural network which obtained by various traditional algorithms, and use ground truth to evaluate the detection results. For the characteristics of hyperspectral data, we use effective dimensionality reduction methods and rich data amplification methods to improve the detection accuracy. Experimental results show that our method can achieve better results on the existing classical datasets.","PeriodicalId":370739,"journal":{"name":"International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference","volume":"111 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116129035","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Color deep learning profilometry for single-shot 3D shape measurement 用于单镜头3D形状测量的颜色深度学习轮廓测量

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2585697

Jiaming Qian, Shijie Feng, Yixuan Li, Tianyang Tao, Qian Chen, C. Zuo

引用次数: 0

Mie-scattering Lidar system with a solar-blind wavelength for atmospheric boundary layer 大气边界层日盲波长密散射激光雷达系统

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2586278

Jiangfeng Shao, Dengxin Hua, Li Wang, Yixuan Zhao, Yan Zhao, Zenghui Liu, Xinyue Cui, Zhenyu Han

{"title":"Mie-scattering Lidar system with a solar-blind wavelength for atmospheric boundary layer","authors":"Jiangfeng Shao, Dengxin Hua, Li Wang, Yixuan Zhao, Yan Zhao, Zenghui Liu, Xinyue Cui, Zhenyu Han","doi":"10.1117/12.2586278","DOIUrl":"https://doi.org/10.1117/12.2586278","url":null,"abstract":"A solar-blind lidar system is developed by using Nd:YAG laser to produce 266nm wavelength at the frequency of 10Hz as the light source to to detect the height of boundary layer in Xi'an area. The observation experiment and analysis are made.The solar background light has no 266nm wavelength and the influence of it can be ignored in the daytime, and then all day detection can be realized. It can be detected in the daytime and nighttime. The wavelength of 266nm absorbed by ozone is considered only. The absolute minimum of first derivative and second derivative of the range-squared-corrected lidar signal are employed to retrieve height of boundary layer. Based on the observation of atmosphere in daytime and nighttime, the heights of atmospheric boundary layer are 0.44km and 0.47km, and the influences of meteorological factors and human activities on the height of atmospheric boundary layer are analyzed. The results showed that the lidar can satisfied the need for detection of troposphere atmospheric aerosol particles at all time and are beneficial to offer practical and effective data for monitoring atmospheric environment in Xi'an aera.","PeriodicalId":370739,"journal":{"name":"International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124216077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation of temperature compensation for geometrical stability in large ring laser 大环形激光器几何稳定性的温度补偿仿真

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2586811

Lisong Zhang, Wenge Guo, L. Yao, Erjiang Zhai, Shitong Liu, Mingming Wei, Xikang Wang, Enxue Yun, Yuping Gao, Shougang Zhang

{"title":"Simulation of temperature compensation for geometrical stability in large ring laser","authors":"Lisong Zhang, Wenge Guo, L. Yao, Erjiang Zhai, Shitong Liu, Mingming Wei, Xikang Wang, Enxue Yun, Yuping Gao, Shougang Zhang","doi":"10.1117/12.2586811","DOIUrl":"https://doi.org/10.1117/12.2586811","url":null,"abstract":"Large ring laser gyros are regarded as suitable sensors for precise monitoring of the Earth’s rotation. Their long-term stability, high sensitivity, and mechanical properties suggest themselves for potential terrestrial deployment, such as Universal Time (UT1), Length of Days (LOD), Geophysics, etc. This inertial technology based on Sagnac interferometers measure any non-reciprocal effect which gives rise to a difference of optical path lengths between forward-propagating laser beams and the counter-propagating within the cavity. Differing from their cousins used in navigation, large ring lasers is usually a heterolithic optical cavity composed of four independent reflector components s to avoid employing large whole Zerodur. Comparing with other UT1 measuring technologies, large ring lasers has characteristics of higher resolution and good real-time, which is highly complementary to VLBI observation technology. In order to meet the measurement of UT1 error less than 1ms/day to coordinate with VLBI, the resolution of ultra-stable laser gyros must be better than 10e-13rad/s. The geometric stability of heterolithic ring cavity is demanded stringently. We simulated the intrinsic relationship between geometric deformation and scale factor of optical cavity. The influence of temperature on geometric deformation has been analyzed and the temperature compensation strategy is proposed. The temperature field distribution of the laser gyro is approximately evaluated by measuring the temperature network of some specific points.","PeriodicalId":370739,"journal":{"name":"International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131497373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The design and fabrication of freeform lenses for generating complex illumination patterns on curved surfaces 用于在曲面上产生复杂照明图案的自由曲面透镜的设计和制造

International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference Pub Date : 2021-01-15 DOI: 10.1117/12.2586416

Yupeng Zhang, Xianglong Mao, Yongjun Xie, Jinpeng Li, Fengbiao Wang, R. Gao

引用次数: 0