Optical Frontiers最新文献_第5页

Rank-based camera spectral sensitivity estimation under multiple illuminations 多照度下基于秩的相机光谱灵敏度估计

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2643637

Bowen Xu, Long Ma, Peng Li

{"title":"Rank-based camera spectral sensitivity estimation under multiple illuminations","authors":"Bowen Xu, Long Ma, Peng Li","doi":"10.1117/12.2643637","DOIUrl":"https://doi.org/10.1117/12.2643637","url":null,"abstract":"The spectral sensitivity function of a digital camera is an important parameter and the recovery of camera spectral sensitivity function is a crucial study. In this paper, we propose a new rank-based constraint algorithm to estimate the spectral sensitivity. The constraints are imposed on the estimation of the spectral sensitivity based on the rank orders of the response values of the digital camera for imaging standard color samples under different illuminations. Color samples and illuminations are known in the estimation process. We have two kinds of ranking constraints in the algorithm, one is ranking under a single illumination, and the other is ranking under multiple illuminations. Besides, with the support of two ranking constraints, we use fewer color samples in the experiments. The study is evaluated by several numerical simulation experiments and compared with other spectral sensitivity estimation algorithms. We added various levels of noise and tried various combinations of multiple illuminations to recover the spectral sensitivity of different cameras. The experimental results suggest that the proposed algorithm performs better in estimating the camera spectral sensitivity function and computational work is reduced. At the same time, utilizing fewer color samples can reduce the complexity of the experiment without increasing the experimental error metric.","PeriodicalId":184319,"journal":{"name":"Optical Frontiers","volume":"12307 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129246488","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

Circuit QED realization of two-qubit photonic phase gate 双量子位光子相位门的电路QED实现

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2643793

X. Jiang, Z. Q. Zhang, S. Tang

引用次数: 0

Robot gluing localization method based on monocular vision 基于单目视觉的机器人粘接定位方法

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2643961

Jinghao Fan, Yingjie Zhang, Shihan Peng, Yuxiang Zhang, G. Zhang

{"title":"Robot gluing localization method based on monocular vision","authors":"Jinghao Fan, Yingjie Zhang, Shihan Peng, Yuxiang Zhang, G. Zhang","doi":"10.1117/12.2643961","DOIUrl":"https://doi.org/10.1117/12.2643961","url":null,"abstract":"A localization method based on monocular vision is proposed to solve the problem of poor flexibility, high cost and unstable accuracy of glue dispensing robot. The method includes the workpiece image feature extraction method based on distribution model and the optimized PNP algorithm based on depth calibration, which can locate the threedimensional coordinates of the workpiece and further generate the gluing track. Firstly, the layout and local coordinates of feature points are determined according to the workpiece model and gluing process, and the feature distribution model and template set are established. Then the image coordinates of feature points are extracted step by step by using workpiece contour features and image gray features, combining multi template and multi angle matching with shape detection, and using acceleration strategies such as image pyramid and angle layer by layer subdivision. Finally, the PNP algorithm is optimized in the Z direction through the depth calibration method to realize the high-precision positioning of the workpiece. The localization experiments of various types of reducer shells under different imaging environments were carried out. The experimental results show that the method has better feature extraction effect for workpieces with complex structure in chaotic environment, and the maximum localization error in one direction is within ± 0.5 mm, which meets the application needs of robot glue positioning. The method can detect the offset of 6 degrees of freedom of the target workpiece at the same time, which has a wider application than the general 2D visual localization method. It can also be used for the localization of parts in other scenes.","PeriodicalId":184319,"journal":{"name":"Optical Frontiers","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115094029","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

Wavelength tunable optically pumped semiconductor disk laser based on SESAM mode locking 基于SESAM模式锁定的波长可调谐光泵浦半导体磁盘激光器

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2643555

Bihui Zhuang, Lingling Hua, J. Tian, Yanrong Song

引用次数: 0

Preparation of entanglement coherent states based on bimodal QED 基于双峰QED的纠缠相干态制备

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2644250

Z. Q. Zhang, X. Jiang, S. Tang

引用次数: 0

Preparation and optical properties of diamond thin films based on fused silica substrates 基于熔融石英衬底的金刚石薄膜的制备及其光学性能

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2645857

Qiao Liu, Kesheng Guo, Q. Hu, Shaoyi Hou, Yongneng Xiao, Lang Hu

{"title":"Preparation and optical properties of diamond thin films based on fused silica substrates","authors":"Qiao Liu, Kesheng Guo, Q. Hu, Shaoyi Hou, Yongneng Xiao, Lang Hu","doi":"10.1117/12.2645857","DOIUrl":"https://doi.org/10.1117/12.2645857","url":null,"abstract":"Diamond and diamond film have excellent performance in optics, electricity, mechanics, chemical stability, etc. Compared with bulk materials, diamond film has low cost and short preparation period, and has good laser damage characteristics, which can replace traditional films to achieve high performance. The laserinduced damage threshold, optical properties and morphology of diamond films are closely related to the growth conditions. In this paper, high-quality diamond films suitable for laser applications were grown on the surface of fused silica by microwave plasma chemical vapor deposition, and the effects of gas flow ratio and temperature on the optical properties of diamond films were studied. The effect of particle morphology on electric field and temperature field. Studies have shown that the growth quality of nanocrystalline diamond films is closely related to the flow ratio of methane/hydrogen and the growth temperature. When the flow ratio of methane/hydrogen is 3%, and the growth temperature is around 800℃, the surface roughness of the film is the lowest. The diamond film shows a morphology of (111) facets, the grain size is in the 20~200nm range, and the transmittance can reach up to 70%. The simulation of the laser electric field and temperature rise with different surface grain shapes shows that the grains of (111) facet can cause the electric field to increase by 2~4 times, and the temperature rise reaches 40~60℃.","PeriodicalId":184319,"journal":{"name":"Optical Frontiers","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127355059","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

Passive synchronization of mode-locked Yb-doped fiber lasers 锁模掺镱光纤激光器的无源同步

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2643609

J. H. Wang, J. Tian, Z. Zhang, Z. Gao, Y. F. Wu, Y. Song

引用次数: 0

Optimized structure of single photon avalanche diode with low dark count rate 低暗计数率单光子雪崩二极管的优化结构

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2643650

Jing Pan, Guilan Feng, Tianqi Zhao, Chunlan Lin, T. Chu, Kaiyue Guo, Liangqiang Xu, Jiabao Li, Wankang Wu

{"title":"Optimized structure of single photon avalanche diode with low dark count rate","authors":"Jing Pan, Guilan Feng, Tianqi Zhao, Chunlan Lin, T. Chu, Kaiyue Guo, Liangqiang Xu, Jiabao Li, Wankang Wu","doi":"10.1117/12.2643650","DOIUrl":"https://doi.org/10.1117/12.2643650","url":null,"abstract":"In this paper, an optimized structure of single photon avalanche diode (SPAD) with p-i-n construction is presented, and the device is compatible with standard CMOS technology. TCAD software and accurate calculation method based on physics mechanism are employed for the device structure design and DCR calculation, respectively. The characteristic parameters of the device, such as electric field and electron and hole triggering probability, are available through TCAD Atlas device simulation. The central region of P-sub doping is designed as a part of avalanche region, which achieves a lower electric field, and makes the band-to-band tunneling suppressed simultaneously. The breakdown voltage of the SPAD is 38.5 V. At excess bias voltage of 5 V, DCR is 0.88 Hz/μm2 at room temperature. The maximum electric field of the optimized structure is 3.8×105 V/cm. As for PDE, at room temperature with 5.0 V excess bias, the PDE is greater than 30% in the 400 nm-675 nm range, with a peak PDE of 40% at 550 nm. At 850 nm, there is still a photon detection efficiency of more than 10%, making the SPAD still have a certain detection capability. The superior performance of this structure makes it suitable for wide applications.","PeriodicalId":184319,"journal":{"name":"Optical Frontiers","volume":"12307 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130247453","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

Conventional soliton dynamics of mode-locked erbium-doped fiber lasers 锁模掺铒光纤激光器的常规孤子动力学

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2643582

Lufen Xu, Lulu Zhang, Zexin Zhang, Z. Gao, J. Tian, Yanrong Song

引用次数: 0

Near-infrared spectroscopy for rapid identification of pharmaceutical excipients 近红外光谱快速鉴别药用辅料

Optical Frontiers Pub Date : 2022-08-11 DOI: 10.1117/12.2643483

Chen Qian, Zhijian Cai

{"title":"Near-infrared spectroscopy for rapid identification of pharmaceutical excipients","authors":"Chen Qian, Zhijian Cai","doi":"10.1117/12.2643483","DOIUrl":"https://doi.org/10.1117/12.2643483","url":null,"abstract":"This study is based on near-infrared spectroscopic detection technology to achieve 100% classification of in-class and out-of-class pharmaceutical ingredients and excipients by support vector machine model.4 types of 8 different pharmaceutical excipients (starches: corn starch, potato starch, sweet potato starch, pregelatinized starch, maltodextrin, lactose: lactose monohydrate, Cellulose: microcrystalline cellulose, phosphate: magnesium stearate) are collected by near-infrared spectrometer, 150 sets of spectral data each. A total of 1200 spectra are used, 840 spectra of which are randomly divided as the training set and 360 as the validation set. Compare the effects of models built by Bayesian algorithm, support vector machine algorithm, and K-nearest neighbor algorithm paired with first-order difference, second-order difference, MSC, and SNV preprocessing, respectively. The results show that both Bayesian and K-nearest neighbor algorithms achieve 100% out-of-class resolution when paired with first-order difference, MSC, and SG smoothing preprocessing methods, In contrast, the support vector machine achieves 100% classification accuracy without any preprocessing, and the accuracy is not reduced after dimensionality reduction by the competitive adaptive reweighting algorithm. Finally, this experiment achieves 100% accuracy of in-class and out-of-class classification of 8 APIs in 4 classes by NIR spectroscopy combined with support vector machine algorithm model, and the CARS algorithm is used for data dimensionality reduction to simplify the model.","PeriodicalId":184319,"journal":{"name":"Optical Frontiers","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126962808","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