Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications最新文献_第4页

High accuracy piston and wobble sensor based on heterodyne interferometry 基于外差干涉测量的高精度活塞和摆动传感器

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026252

C. Silva, A. Cabral, M. Abreu, J. Rebordão, D. Castro Alves

{"title":"High accuracy piston and wobble sensor based on heterodyne interferometry","authors":"C. Silva, A. Cabral, M. Abreu, J. Rebordão, D. Castro Alves","doi":"10.1117/12.2026252","DOIUrl":"https://doi.org/10.1117/12.2026252","url":null,"abstract":"Heterodyne laser interferometry has proved to be a valuable technique for high accuracy optical displacement metrology. In many applications in science and engineering, it is required a highly accurate measurement of multiple degrees of freedom of a critical device with regard to a mechanical system reference. An example is the primary calibration of standard accelerometers by interferometry. In this context, it is proposed a multi-channel system based on a heterodyne interferometer for simultaneous measurement of piston and wobble of the accelerometer top surface. The implemented system is based on a Michelson interferometer, with four parallel beams of equal intensity that enable simultaneous measurement of different points of the surface. The parallel approach reduces the complexity due the simultaneous use of common units (laser source, modulators and some optics), maintaining the high resolution associated with interferometric sources. In this paper we present a new metrology concept based on heterodyne interferometry that can allow the simultaneous measurement of a surface piston and wobble movement, detailing the physical model of the sensor, the prototype implementation and the performance characterized by the test result. The future steps towards an implementation in a primary standard accelerometer calibration setup are also described.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125796231","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

Enhancement of refractive index sensitivity of the in-line Mach-Zehnder interferometer through bending 弯曲增强直线马赫-曾德尔干涉仪的折射率灵敏度

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2028226

C. R. da Silveira, J. Costa, M. T. Giraldi, Marcos A. R. Franco, P. Jorge

引用次数: 1

Morphological analysis of Bacillux polymyxa colonies: digital image analysis in wide-field microscopy 多粘杆菌菌落形态分析:宽视场显微镜数字图像分析

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2027612

L. M. Guerrero, A. Plata G., Giovanna Rincón C., Henry Gutiérrez A., A. Plata

引用次数: 0

GUCLF: a new light field face database 一种新的光场人脸数据库

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026184

Ramachandra Raghavendra, K. Raja, Bian Yang, C. Busch

{"title":"GUCLF: a new light field face database","authors":"Ramachandra Raghavendra, K. Raja, Bian Yang, C. Busch","doi":"10.1117/12.2026184","DOIUrl":"https://doi.org/10.1117/12.2026184","url":null,"abstract":"The advancement in face recognition algorithm has a strong relationship with the availability of face databases that exhibit varying factors reflecting real life scenarios. The GUCLF face database is the first of its kind that can strongly influence the advancement in face recognition technology. In this paper, we introduce and describe our new face samples database collected using Lytro light field camera. The database consists of 200 reference samples and 303 probe samples collected from 25 subjects. The reference samples are collected in the controlled conditions using Canon EOS 550D DSLR camera. While probe samples are captured using both conventional digital camera (Sony DSC-S750) and Lytro light field camera. The probe samples are captured in three different scenarios: indoor, corridor and outdoor to include all possible real life conditions. In addition to the database description, this paper also elaborates on possible uses of the collected database and proposes a testing protocol. Further, we also present the quantitative results from the baseline experiments using the Kernel Discriminant Analysis (KDA).","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128653153","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

Fiber specklegram sensors (FSS) for measuring high frequency mechanical perturbations 光纤散斑图传感器(FSS)用于测量高频机械扰动

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026075

Alejandro Hoyos, N. D. Gómez, J. A. Gómez

引用次数: 5

Comparison between three methods to value lower tear meniscus measured by image software 图像软件测量下撕裂半月板价值的三种方法比较

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2030433

C. García-Resúa, Hugo Pena-Verdeal, M. Lira, M. Oliveira, M. .. Giraldez, E. Yebra-Pimentel

{"title":"Comparison between three methods to value lower tear meniscus measured by image software","authors":"C. García-Resúa, Hugo Pena-Verdeal, M. Lira, M. Oliveira, M. .. Giraldez, E. Yebra-Pimentel","doi":"10.1117/12.2030433","DOIUrl":"https://doi.org/10.1117/12.2030433","url":null,"abstract":"To measure different parameters of lower tear meniscus height (TMH) by using photography with open software of measurement. TMH was addressed from lower eyelid to the top of the meniscus (absolute TMH) and to the brightest meniscus reflex (reflex TMH). 121 young healthy subjects were included in the study. The lower tear meniscus was videotaped by a digital camera attached to a slit lamp. Three videos were recorded in central meniscus portion on three different methods: slit lamp without fluorescein instillation, slit lamp with fluorescein instillation and TearscopeTM without fluorescein instillation. Then, a masked observed obtained an image from each video and measured TMH by using open source software of measurement based on Java (NIH ImageJ). Absolute central (TMH-CA), absolute with fluorescein (TMH-F) and absolute using the Tearscope (TMH-Tc) were compared each other as well as reflex central (TMH-CR) and reflex Tearscope (TMH-TcR). Mean ± S.D. values of TMH-CA, TMH-CR, TMH-F, TMH-Tc and TMH-TcR of 0.209 ± 0.049, 0.139 ± 0.031, 0.222 ± 0.058, 0.175 ± 0.045 and 0.109 ± 0.029 mm, respectively were found. Paired t-test was performed for the relationship between TMH-CA – TMH-CR, TMH-CA – TMH-F, TMH-CA – TMH-Tc, TMH-F – TMH-Tc, TMH-Tc – TMH-TcR and TMH-CR – TMH-TcR. In all cases, it was found a significant difference between both variables (all p < 0.008). This study showed a useful tool to objectively measure TMH by photography. Eye care professionals should maintain the same TMH parameter in the follow-up visits, due to the difference between them.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129968550","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

Quantum discord with weak measurement operators of quasi-Werner states based on bipartite entangled coherent states 基于二部纠缠相干态的准werner态弱测量算子的量子不和谐

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2021625

E. Castro, R. Gómez, C. Ladera, A. Zambrano

引用次数: 0

Optical characterization of volcanic ash using diffuse reflection spectroscopy 利用漫反射光谱法对火山灰进行光学表征

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026365

D. Kelly Bravo, N. Falcón, Freddy J. Narea, Rafael A. Muñoz, Aaron A. Muñoz

引用次数: 0

Assessing the optical properties of the healthy and emmetropic eye with accommodation 评估具有调节功能的健康和准光眼的光学特性

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2028240

C. Oliveira, S. Franco

引用次数: 0

The perfect vortex and its realization by the liquid crystal spatial light modulator 液晶空间光调制器的完美涡旋及其实现

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2022120

C. Rickenstorff, A. S. Ostrovsky

引用次数: 1