Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications最新文献_第7页

Propagation of the four-wave mixing signal immersed in a thermal bath 四波混频信号在热浴中的传播

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2021376

M. Izquierdo, A. Mastrodoménico, J. L. Paz

引用次数: 0

Photon kinetic description of nonlinear cross-phase modulation 非线性交叉相位调制的光子动力学描述

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026316

J. T. Mendonça, H. Crespo, A. A. Amorim, L. Bernardo

引用次数: 0

Accuracy of the optical testing of a fast aspheric concave surface through null-screens 零屏快速非球面凹面光学检测的精度

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2025722

M. Campos-García, F. Granados-Agustin, E. Percino-Zacarías, Amilcar Estrada-Molina, V. Moreno-Oliva, A. Santiago-Alvarado, M. Avendaño-Alejo

引用次数: 0

Automatic real-time generalized phase-shifting interferometry to process interferograms with spatio-temporal visibility 自动实时广义移相干涉法处理具有时空可视性的干涉图

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2026103

R. Juarez-Salazar, C. Robledo-Sánchez, C. Meneses-Fabian, G. Rodríguez-Zurita, Fermin Guerrero Sanchez, A. Barcelata-Pinzón

引用次数: 4

Angular distribution of the averaged luminous intensity of low power LEDs transfer standards 低功率led平均发光强度的角分布传输标准

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2027039

J. L. Velazquez, A. Ferrero, M. López, A. Pons, A. Villamarín, J. Campos, A. Sperling

{"title":"Angular distribution of the averaged luminous intensity of low power LEDs transfer standards","authors":"J. L. Velazquez, A. Ferrero, M. López, A. Pons, A. Villamarín, J. Campos, A. Sperling","doi":"10.1117/12.2027039","DOIUrl":"https://doi.org/10.1117/12.2027039","url":null,"abstract":"A goniophotometer to characterize the angular distribution of the averaged luminous intensity of LEDs has been developed at Optics Institute of CSIC. Distributions of for four low-power LEDs transfer standards (red, blue, green and white) for luminous flux and luminous intensity are shown. A proper characterization of the angular luminous intensity distribution allows measurement uncertainties to be better determined. The instrument has got a photometer placed on a ruled optical bench to vary the source-detector distance and a CCD camera to carry out the alignment of the LEDs respect to the centre of geometrical reference system. Measurements were taken at a distance of 316 mm (condition A of the CIE) to different LEDs by varying the polar angle between 0° and 90° with a step of 5° and the azimuth angle between 0° and 180° with a step of around 11°. The red LED is the most Lambertian, whereas the blue, green and white LEDs have a different behavior. Finally, to identify systematic errors, a comparison with the measurements of a similar goniophotometer in Physikalisch-Technische Bundesanstalt (PTB) was carried out.","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":"115864751","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

Optical characterization of thermal properties of biological tissue 生物组织热特性的光学表征

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2025877

A. Gutierrez-Arroyo, C. Sánchez Pérez, N. Alemán-García, C. Piña-Barba

{"title":"Optical characterization of thermal properties of biological tissue","authors":"A. Gutierrez-Arroyo, C. Sánchez Pérez, N. Alemán-García, C. Piña-Barba","doi":"10.1117/12.2025877","DOIUrl":"https://doi.org/10.1117/12.2025877","url":null,"abstract":"In this work we utilize heat conduction measurements trough the photothermal beam deflection technique to characterize thermal properties of biological tissue. We design a heat flux sensor based on the phenomenon of photothermal laser beam deflection within a thermo-optic slab (acrylic), where the deflection is quantified by an optical fiber angle sensor. We analytically model the heat flux sensor response based on heat wave propagation theory that well agree with experimental data. We present heat conduction measurements on different tissues applying a heat pulse. Hence we obtain the thermal effusivity coefficient of bovine tendon and chicken liver and heart. It has been shown that thermal conduction depends on the tissue´s chemical composition as well on their structural arrangements, so any modification in tissue will affect on heat conduction rendering this method potentially useful as an auxiliary in biomedical studies. Nowadays there are several thermal effusivity and diffusivity measurement techniques with classic calorimetry (using thermistors) for research and industrial applications. However there are only few integrated optical devices already proposed, turning this optical technique in an innovative and alternative sensing system for thermal properties characterization.","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":"125515109","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

Experiment design for through-focus testing of intraocular lenses 人工晶状体透焦检测的实验设计

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2025474

M. S. Millán, F. Alba-Bueno, F. Vega

{"title":"Experiment design for through-focus testing of intraocular lenses","authors":"M. S. Millán, F. Alba-Bueno, F. Vega","doi":"10.1117/12.2025474","DOIUrl":"https://doi.org/10.1117/12.2025474","url":null,"abstract":"Eye models to test intraocular lenses (IOLs) in an optical bench are commonly designed in agreement with the ISO 11979-2 and 11979-9 standard requirements. However, modifications to the ISO eye model have been proposed to test IOLs in conditions closer to real human eye. Wavefront analysis and aberration characterization, wavelength dependence, efficiency, off-axis performance and imaging degradation under certain amount of misalignment can thus be measured in vitro. The main parts of the system to test IOLs are: the illumination system and object test, the eye model including the IOL immersed in a wet cell and a microscope assembled to a sensor that magnifies and captures the aerial image of the object formed by the eye model. A problem concerning the simultaneous variation of defocus and magnification arises when using the microscope to capture out-of-focus images in a through-focus study. Using the eye model, we study the problem of implementing a through-focus measurement of the imaging quality of an IOL. We find a solution based on geometrical optics and compare it with other proposals reported in the literature. The effects on the measurement of the Modulation Transfer Function and the Point Spread Function are predicted. Experimental results are obtained and discussed.","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":"126118689","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

Interobserver and intraobserver repeatability of lipid layer pattern evaluation by two experienced observers 由两名经验丰富的观察者进行的脂质层模式评估的观察者间和观察者内的可重复性

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2030432

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

{"title":"Interobserver and intraobserver repeatability of lipid layer pattern evaluation by two experienced observers","authors":"C. García-Resúa, Hugo Pena-Verdeal, M. Lira, M. G. Penedo, M. .. Giraldez, E. Yebra-Pimentel","doi":"10.1117/12.2030432","DOIUrl":"https://doi.org/10.1117/12.2030432","url":null,"abstract":"The lipid layer plays a major role in limiting evaporation of the tear film. Based on interference phenomena, there is a test directed to lipid layer pattern (LLP) evaluation, but is affected by subjective interpretation of the patterns. The aim of this study is to compare the LLP evaluation between two experienced observers on a group of healthy patients. Furthermore, the observers re-evaluated the same images in order to check their individual repeatability. LLP was examined using a Tearscope-plus (Keeler, Windsor, UK) attached to a slit lamp. Tear film was recorded by a Topcon DV-3 digital camera video and LLP images were captured. This yielded 124 LLP images that were categorized (based on Guillon’s schema) by two expert observers in two sessions separated by one month. Interobserver repeatability and intraobserver repeatability between both sessions were studied by using Cohen’s kappa coefficient. Comparing LLP categorization between both observers, Cohen's kappa coefficient was 0.615 and 0.633 for first and second session, respectively. When comparing LLP categorization by the same observer between both sessions, Cohen's kappa coefficient was 0.770 and 0.812 for Observer 1 and Observer 2. These results indicate substantial correlation in all cases [range of 0.61–0.80]. The most frequent misinterpretations were between open and closed meshwork and Wave and closed meshwork patterns. Although substantial correlation was found between categorizations of experienced observers, misinterpretation of the patters may appear even in the same observer. Some misinterpretations between adjacent patterns could be palliated by including intermediate patterns between those categories.","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":"131406446","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

Spatially inhomogeneous phase-modulating interferometry by non-quadrature amplitude modulation 非正交调幅的空间非均匀调相干涉测量

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2025664

U. Rivera-Ortega, C. Meneses-Fabian, G. Rodríguez-Zurita

引用次数: 0

Measuring the area of tear film break-up by image analysis software 利用图像分析软件测量泪膜破裂面积

Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications Pub Date : 2013-11-18 DOI: 10.1117/12.2030431

Hugo Pena-Verdeal, C. García-Resúa, L. Ramos, A. Mosquera, E. Yebra-Pimentel, M. .. Giraldez

{"title":"Measuring the area of tear film break-up by image analysis software","authors":"Hugo Pena-Verdeal, C. García-Resúa, L. Ramos, A. Mosquera, E. Yebra-Pimentel, M. .. Giraldez","doi":"10.1117/12.2030431","DOIUrl":"https://doi.org/10.1117/12.2030431","url":null,"abstract":"Tear film breakup time (BUT) test only examines the first break in the tear film, but subsequent tear film events are not monitored. We present a method of measuring the area of breakup after the appearance of the first breakup by using open source software. Furthermore, the speed of the rupture was determined. 84 subjects participated in the study. 2 μl volume of 2% sodium fluorescein was instilled using a micropipette. The subject was seated behind a slit-lamp using a cobalt blue filter together with a Wratten 12 yellow filter. Then, the tear film was recorded by a camera attached to the slit lamp. 4 frames of each video was extracted, the first rupture (BUT_0), breakup after 1 second (BUT_1), rupture after 2 seconds (BUT_2) and breakup before the last blink (BUT_F). Open source software of measurement based on Java (NIH ImageJ) was used to measure the number of pixels in areas of breakup. These areas were divided by the area of exposed cornea to obtain the percentage of ruptures. Instantaneous breakup speed was calculated for second 1 as the difference between BUT_1 - BUT_0, whereas instant speed for second 2 was BUT_2 - BUT_1. Mean area of breakup obtained was: BUT_0 = 0.26%, BUT_1 = 0.48%, BUT_2 = 0.79% and BUT_F = 1.61%. Break speed was 0.22 area/sec for second 1 and 0.31 area/sec for second 2, showing a statistical difference between them (p = 0.007). Post BUT analysis may be easily monitoring with the aid of this software.","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":"134366680","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