Current Developments in Lens Design and Optical Engineering XX最新文献_第2页

Design of a head-mounted display with freeform mirrors 自由镜头戴式显示器的设计

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2531787

Congshan Rui, Chun-mei Zeng, Tian-tian Hu, Suo-dong Ma

引用次数: 0

Determination of rough microstructures on the surface of metals using the light scattering method in waveguides 用波导中的光散射法测定金属表面粗糙微结构

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2526123

N. Espinosa, C. Vega, Jorge Alvarez, P. Leon, J. Vila

引用次数: 0

Fractal analysis for classification of breast lesions 乳腺病变分形分析

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2531201

L. Alvarado-Cruz, M. Delgadillo-Herrera, C. Toxqui-Quitl, A. Padilla-Vivanco, R. Castro-Ortega, M. Arreola-Esquivel

引用次数: 3

Deployment of combined higher order aberrations to extend the depth of focus of lenses 组合高阶像差的部署，以延长镜头的聚焦深度

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2530144

D. Monteiro, R. F. D. O. Costa, Luiz Melk de Carvalho

引用次数: 0

Fundus camera versus smartphone camera attachment: image quality analysis 眼底相机与智能手机相机附件:图像质量分析

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2528965

Nicole Barritt, Mohana Kuppuswamy Parthasarathy, Ibrahim Faruq, J. Zelek, V. Lakshminarayanan

{"title":"Fundus camera versus smartphone camera attachment: image quality analysis","authors":"Nicole Barritt, Mohana Kuppuswamy Parthasarathy, Ibrahim Faruq, J. Zelek, V. Lakshminarayanan","doi":"10.1117/12.2528965","DOIUrl":"https://doi.org/10.1117/12.2528965","url":null,"abstract":"Fundus cameras are the current clinical standard for capturing retinal images, which are used to diagnose a variety of sight-threatening conditions. Traditional fundus cameras are not easily transported, making them unsuitable for field use. In addition, traditional fundus cameras are expensive. Due to this, a variety of technologies have been developed such as the D-EYE Digital Ophthalmoscope (D-EYE Srl, Padova, Italy) which is compatible with various cellphone cameras. This paper reports on the comparison of the image quality of the Nidek RS-330 OCT Retina Scan Duo (Nidek, Tokyo, Japan) and the D-EYE paired with an iPhone 6 (Apple, Cupertino, USA). Twenty-one participants were enrolled in the study of whom 14 underwent nonmydriatic and mydriatic imaging with the D-EYE and the Nidek. Seven participants underwent nonmydriatic imaging with the D-EYE and the Nidek. The images were co-registered and cropped so that the region of interest was equal in both the D-EYE and Nidek images, as the D-EYE had a smaller field of view. Using the Nidek image as the reference, objective full-reference image quality analysis was performed. Metrics such as structural similarity index and peak signal noise ratio were obtained. It was found that the image quality of the D-EYE is limited by the attached iPhone camera, and is lower when compared to the Nidek. Quantification of the differences between the D-EYE and Nidek allows for targeted development of smartphone camera attachments that can help to bridge the current gap in image quality.","PeriodicalId":10843,"journal":{"name":"Current Developments in Lens Design and Optical Engineering XX","volume":"41 4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89986541","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: 4

Application of GPUs in optical design software gpu在光学设计软件中的应用

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2526861

B. Mischuck, E. Page, A. Croce

引用次数: 0

Freeform optics design of primary lens for uniform irradiance distribution of a concentrator photovoltaic system 聚光光伏系统辐照度均匀分布主透镜的自由曲面光学设计

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2531251

T. Pham, N. Duy, N. Vu, Seoyong Shin

{"title":"Freeform optics design of primary lens for uniform irradiance distribution of a concentrator photovoltaic system","authors":"T. Pham, N. Duy, N. Vu, Seoyong Shin","doi":"10.1117/12.2531251","DOIUrl":"https://doi.org/10.1117/12.2531251","url":null,"abstract":"In this paper, a primary lens of concentrator photovoltaic (CPV) system is designed by using freeform optics. The designed lens is constructed based on a basic idea of a combination of Fresnel lens and freeform optics, in which the lens is divided into an array of sub-lenses, which are designed using the conservation of optical path length and the edge ray theorem to get uniform irradiance distribution over the receiver. In this design, every sub-lens is designed to guide the direct sunlight over the receiver with uniform irradiance so that the whole of the primary lens will converge uniformly the direct sunlight over the receiver. The structure of the lens is designed firstly by using Matlab program for every sub-lens. The Matlab data of the designed lens structure is then used to build the three-dimensional (3D) lens in LightTools™ software. The ray tracing technique in LightTools™ software is used to find out the optimum structure of the freeform lens. Furthermore, the simulation is performed to estimate the efficiency of the lens as a concentrator of a CPV system by using the light source with the sunlight spectrum. The designed lens can achieve high geometrical concentration ratio and uniform irradiance distribution over the receiver. The simulation results show that the lens can easily reach a high concentration ratio (494 times) with uniform irradiance distribution and good optical efficiency (86%).","PeriodicalId":10843,"journal":{"name":"Current Developments in Lens Design and Optical Engineering XX","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88946587","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: 3

Normalized difference indices in Landsat 5 TM satellite data Landsat 5 TM卫星数据的归一化差指数

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2532322

M. Delgadillo-Herrera, M. Arreola-Esquivel, C. Toxqui-Quitl, A. Padilla-Vivanco

引用次数: 5

Silicon Fresnel lens fabricated using greyscale lithography 采用灰阶光刻技术制造的硅菲涅耳透镜

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2530649

Chengpo Chen, J. Karp, Tim Toepfer, O. Boomhower, J. Kretchmer, S. Goswami, Sachin Dekate, L. Tsakalakos

{"title":"Silicon Fresnel lens fabricated using greyscale lithography","authors":"Chengpo Chen, J. Karp, Tim Toepfer, O. Boomhower, J. Kretchmer, S. Goswami, Sachin Dekate, L. Tsakalakos","doi":"10.1117/12.2530649","DOIUrl":"https://doi.org/10.1117/12.2530649","url":null,"abstract":"A silicon Fresnel lens was designed and fabricated using a greyscale lithography technique to shape optical emissions from an edge-emitting semiconductor diode laser. The laser beam was collimated in the fast axis and allowed a ±3° divergence in the slow axis along with bias angle accomplished through lens decentering. The lens had an aperture of 6.8 mm × 2.2 mm and 1 mm in total thickness. The lens was first designed as a contiguous surface using conventional raytracing methods, and then converted to a Fresnel sag model with an etch depth of 6.25 micrometers. The sag model along with the manufacturing tolerances were fed back through numerical tools to refine the design and modify the lens shape and laser position. Optical profilometry of fabricated lens element found deviations from design and nonuniformity across the entire aperture, with over-etching in the center and under-etching toward the edge of the lens. Characterization of the fabricated lenses showed less than 5% deviation in etch depth. Collimation performance was measured to be less than 2 milliradians, which was in close agreement with design models. Greyscale fabrication of the lens element enabled complex curvatures to be combined and provided a compact solution for direct, single optic coupling of diode laser to free-space projection.","PeriodicalId":10843,"journal":{"name":"Current Developments in Lens Design and Optical Engineering XX","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84939991","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

General formula for aspheric collimator lens design free of spherical aberration 无球差非球面准直透镜设计的一般公式

Current Developments in Lens Design and Optical Engineering XX Pub Date : 2019-08-30 DOI: 10.1117/12.2527341

Rafael G. González-Acuña, J. Gutiérrez-Vega

引用次数: 4