Optics最新文献 - Book学术

Toraldo’s Composed Pupil: A Theoretical Analysis of the Near Field 托拉尔多的合成瞳孔：近场理论分析

Optics Pub Date : 2024-07-10 DOI: 10.3390/opt5030023

Daniela Mugnai, Pietro Bolli, Laura Burzagli, Luca Olmi

{"title":"Toraldo’s Composed Pupil: A Theoretical Analysis of the Near Field","authors":"Daniela Mugnai, Pietro Bolli, Laura Burzagli, Luca Olmi","doi":"10.3390/opt5030023","DOIUrl":"https://doi.org/10.3390/opt5030023","url":null,"abstract":"Over the years, there has been much speculation to understand whether (and how) it was possible to go below the diffraction limit. An advance in knowledge was achieved with the development of microwave techniques. In fact, more than fifty years after the publication of Toraldo’s article dealing with this topic, some experimental measurements in the range of microwaves confirmed the validity of his model. Since some measurements were performed in the region of near field, while Toraldo’s model refers to the far field, the need for a theoretical analysis in the framework of the Fresnel optics arose. The main goal of the present paper is to describe the problem of propagation in the near field (Fresnel optics) by using the same theoretical model already proposed by Toraldo. In order to test the validity of this new approach, the theoretical model has been compared with the FEKO simulation. The comparison of the theoretical model with the FEKO simulation in the far field for an open pupil (an open circular aperture) shows perfect agreement, as expected. We will demonstrate that there is also good agreement in the near field, although it is limited to the region around the main lobe, which is usually the region of main physical interest. Moving away from the main lobe, namely away from the optical axis, the agreement becomes less significant.","PeriodicalId":516083,"journal":{"name":"Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141662201","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

A Mach–Zehnder Fabry–Perot Hybrid Fibre-Optic Interferometer for a Large Measurement Range Based on the Kalman Filter 基于卡尔曼滤波器的大测量范围马赫-泽恩德法布里-珀罗混合光纤干涉仪

Optics Pub Date : 2024-05-16 DOI: 10.3390/opt5020020

Yixuan Wang, Peigang Yang, Tao Jin

引用次数: 0

Creation of a Corneal Flap for Laser In Situ Keratomileusis Using a Three-Dimensional Femtosecond Laser Cut: Clinical and Optical Coherence Tomography Features 使用三维飞秒激光切削为激光原位角膜磨镶术制作角膜瓣：临床和光学相干断层扫描特征

Optics Pub Date : 2024-05-10 DOI: 10.3390/opt5020019

Antonio Leccisotti, Stefania V. Fields, G. De Bartolo, Christian Crudale, Matteo Posarelli

{"title":"Creation of a Corneal Flap for Laser In Situ Keratomileusis Using a Three-Dimensional Femtosecond Laser Cut: Clinical and Optical Coherence Tomography Features","authors":"Antonio Leccisotti, Stefania V. Fields, G. De Bartolo, Christian Crudale, Matteo Posarelli","doi":"10.3390/opt5020019","DOIUrl":"https://doi.org/10.3390/opt5020019","url":null,"abstract":"Laser in situ keratomileusis (LASIK) is the most frequently used technique for the surgical correction of refractive errors on the cornea. It entails the creation of a superficial hinged corneal flap using a femtosecond laser, ablation of the underlying stromal bed using an excimer laser, and repositioning of the flap. A corneal flap with an angled side cut reduces the risk of flap dislocation and infiltration of epithelial cells and confers unique biomechanical properties to the cornea. A new laser software creating three-dimensional (3D) flaps using a custom angle side cut was retrospectively evaluated, comparing optical coherence tomography 3D (with intended 90° side cut) and 2D flaps (with tapered side cuts) as well as respective intra- and early postoperative complications. Four hundred consecutive eyes were included, two hundred for each group. In the 3D group, the mean edge angle was 92°, and the procedure was on average 5.2 s slower (p = 0). Non-visually significant flap folds were found in thirteen eyes of the 2D group and in seven eyes of the 3D group (p = 0.17). In conclusion, the creation of a LASIK flap using a 3D femtosecond laser cut, although slightly slower, was safe and effective. The side cut angle was predictable and accurate.","PeriodicalId":516083,"journal":{"name":"Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140991855","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

Multipolar Analysis in Symmetrical Meta-Atoms Sustaining Fano Resonances 维持法诺共振的对称元原子的多极分析

Optics Pub Date : 2024-04-15 DOI: 10.3390/opt5020017

Vittorio Bonino, Angelo Angelini

引用次数: 0

Enhancing Microwave Photonic Interrogation Accuracy for Fiber-Optic Temperature Sensors via Artificial Neural Network Integration 通过人工神经网络集成提高光纤温度传感器的微波光子干涉精度

Optics Pub Date : 2024-04-10 DOI: 10.3390/opt5020016

Roman Makarov, Mohammed Qaid, Alaa N. Al Hussein, Bulat Valeev, Timur A. Agliullin, V. Anfinogentov, A. Sakhabutdinov

引用次数: 0

Wavelet-Based Machine Learning Algorithms for Photoacoustic Gas Sensing 基于小波的光声气体传感机器学习算法

Optics Pub Date : 2024-04-03 DOI: 10.3390/opt5020015

Artem Kozmin, E. Erushin, Ilya Miroshnichenko, Nadezhda Kostyukova, Andrey Boyko, Alexey A. Redyuk

引用次数: 0

Angle-Resolved Optical Characterization of a Plasmonic Triangular Array of Elliptical Holes in a Gold Layer 金层中椭圆孔等离子三角阵列的角度分辨光学特性分析

Optics Pub Date : 2024-03-21 DOI: 10.3390/opt5010014

M. Angelini, K. Jefimovs, P. Pellacani, Dimitrios Kazazis, Franco Marabelli, F. Floris

引用次数: 0

A Non-Destructive Study of Optical, Geometric and Luminescent Parameters of Active Optical Fibers Preforms 有源光纤预型件光学、几何和发光参数的非破坏性研究

Optics Pub Date : 2024-03-20 DOI: 10.3390/opt5010013

Yuri A. Konstantinov, Artem Timofeevich Turov, K. Latkin, D. Claude, Irina Sergeevna Azanova

引用次数: 0

Lidar-Based Spatial Large Deflection Measurement System for Wind Turbine Blades 基于激光雷达的风力涡轮机叶片空间大偏转测量系统

Optics Pub Date : 2024-03-04 DOI: 10.3390/opt5010011

Yue Hu, Yutian Zhu, Aiguo Zhou, Penghui Liu

{"title":"Lidar-Based Spatial Large Deflection Measurement System for Wind Turbine Blades","authors":"Yue Hu, Yutian Zhu, Aiguo Zhou, Penghui Liu","doi":"10.3390/opt5010011","DOIUrl":"https://doi.org/10.3390/opt5010011","url":null,"abstract":"With the advancement of China’s wind power industry, research into full-scale structural testing of wind turbine blades, including static testing and fatigue testing, has shown increasing significance. Static testing measures the deflection at fixed points, using pull-wire sensors in industrial practice. However, the demerits of this method involve single dimension, excessive deviation, costly experiment, and complex installment. Given the advantages that lidar provides, correspondingly, high data density, precision, and convenience, we proposed a simple and efficient spatial large deflection measurement system for wind turbine blades with multi lidars. For point clouds collected from lidar scanners, registration based on point primitives and geometric primitives, dynamic radius DBSCAN clustering, spatial line clustering, and line integrals are applied to calculate the 3D coordinates of measured points on the blade. Experimentally validated, the proposed method demonstrates its effectiveness in serving as a viable alternative to the traditional pull-wire sensor measurement approach. In the minimum oscillation direction test, the measurement error is controlled within 3% compared to the theoretical value. Simultaneously, in the maximum swing direction test, the 3D coordinates of the measured point remain consistent with the changing trend observed under small deformation. These results confirm the feasibility of the system and its potentials to be generalized.","PeriodicalId":516083,"journal":{"name":"Optics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140265510","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

Photoacoustic Imaging of Human Skin for Accurate Diagnosis and Treatment Guidance 用于准确诊断和治疗指导的人体皮肤光声成像技术

Optics Pub Date : 2024-03-01 DOI: 10.3390/opt5010010

Yue Ying, Hong Zhang, Li Lin

引用次数: 0