SPIE Photonics Europe最新文献_第4页

Modeling and simulation of the solar concentrator in photovoltaic systems through the application of a new BRDF function model 应用一种新的BRDF函数模型对光伏系统中的太阳能聚光器进行建模与仿真

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2227885

K. Plachta

引用次数: 0

3D phase stepping optical profilometry using a fiber optic Lloyd's mirror 使用光纤劳氏镜的三维相位步进光学轮廓术

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2225613

Gulsen Kosoglu, H. Yuksel, M. N. Inci

{"title":"3D phase stepping optical profilometry using a fiber optic Lloyd's mirror","authors":"Gulsen Kosoglu, H. Yuksel, M. N. Inci","doi":"10.1117/12.2225613","DOIUrl":"https://doi.org/10.1117/12.2225613","url":null,"abstract":"This study defines measurements of three-dimensional rigid-body shapes by using a fiber optic Lloyd’s mirror. A fiber optic Lloyd's mirror assembly is basically a technique to create an optical interference pattern using the real light point sources and their images. The generated fringe pattern thanks to this technique is deformed when it is projected on an object's surface. The introduced surface profilometry algorithm depends on a multi-step phase shifting process. The deformed fringe patterns containing information of the object's surface profile are captured by a digital CCD camera. While each frames are captured, required π∕2 phase shifts for interference fringe pattern are obtained by mechanically sliding the Lloyd assembly via an ordinary micrometer stage. Some preprocess algorithms are applied to the frames and are processed with an algorithm to accomplish 3D topographies. Finally, the continuous data determines the depth information and the surface topography of the object. The experimental setup is simple and low cost to construct, and is insensitive to the ambient temperature fluctuations and environmental vibrations that cause unwanted effects on the projected fringe pattern. Such a fiber optic Lloyd’s system which provides an accurate non-contact measurement without contaminating and harming the object surface has a wide range of applications from laser interference based lithography in nano-scale to macro-scale interferometers.","PeriodicalId":285152,"journal":{"name":"SPIE Photonics Europe","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126187242","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

Robust object tracking techniques for vision-based 3D motion analysis applications 基于视觉的三维运动分析应用的鲁棒目标跟踪技术

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2227879

V. Knyaz, S. Zheltov, B. Vishnyakov

{"title":"Robust object tracking techniques for vision-based 3D motion analysis applications","authors":"V. Knyaz, S. Zheltov, B. Vishnyakov","doi":"10.1117/12.2227879","DOIUrl":"https://doi.org/10.1117/12.2227879","url":null,"abstract":"Automated and accurate spatial motion capturing of an object is necessary for a wide variety of applications including industry and science, virtual reality and movie, medicine and sports. For the most part of applications a reliability and an accuracy of the data obtained as well as convenience for a user are the main characteristics defining the quality of the motion capture system. Among the existing systems for 3D data acquisition, based on different physical principles (accelerometry, magnetometry, time-of-flight, vision-based), optical motion capture systems have a set of advantages such as high speed of acquisition, potential for high accuracy and automation based on advanced image processing algorithms. For vision-based motion capture accurate and robust object features detecting and tracking through the video sequence are the key elements along with a level of automation of capturing process. So for providing high accuracy of obtained spatial data the developed vision-based motion capture system “Mosca” is based on photogrammetric principles of 3D measurements and supports high speed image acquisition in synchronized mode. It includes from 2 to 4 technical vision cameras for capturing video sequences of object motion. The original camera calibration and external orientation procedures provide the basis for high accuracy of 3D measurements. A set of algorithms as for detecting, identifying and tracking of similar targets, so for marker-less object motion capture is developed and tested. The results of algorithms’ evaluation show high robustness and high reliability for various motion analysis tasks in technical and biomechanics applications.","PeriodicalId":285152,"journal":{"name":"SPIE Photonics Europe","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123791415","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: 9

Coded access optical sensor (CAOS) imager and applications 编码存取光学传感器(CAOS)成像仪及其应用

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2227699

N. Riza

{"title":"Coded access optical sensor (CAOS) imager and applications","authors":"N. Riza","doi":"10.1117/12.2227699","DOIUrl":"https://doi.org/10.1117/12.2227699","url":null,"abstract":"Starting in 2001, we proposed and extensively demonstrated (using a DMD: Digital Micromirror Device) an agile pixel Spatial Light Modulator (SLM)-based optical imager based on single pixel photo-detection (also called a single pixel camera) that is suited for operations with both coherent and incoherent light across broad spectral bands. This imager design operates with the agile pixels programmed in a limited SNR operations starring time-multiplexed mode where acquisition of image irradiance (i.e., intensity) data is done one agile pixel at a time across the SLM plane where the incident image radiation is present. Motivated by modern day advances in RF wireless, optical wired communications and electronic signal processing technologies and using our prior-art SLM-based optical imager design, described using a surprisingly simple approach is a new imager design called Coded Access Optical Sensor (CAOS) that has the ability to alleviate some of the key prior imager fundamental limitations. The agile pixel in the CAOS imager can operate in different time-frequency coding modes like Frequency Division Multiple Access (FDMA), Code-Division Multiple Access (CDMA), and Time Division Multiple Access (TDMA). Data from a first CAOS camera demonstration is described along with novel designs of CAOS-based optical instruments for various applications.","PeriodicalId":285152,"journal":{"name":"SPIE Photonics Europe","volume":"81 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124778406","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: 5

Local retrodiction models for photon-noise-limited images 光子噪声受限图像的局部反演模型

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2224444

M. Sonnleitner, J. Jeffers, S. Barnett

引用次数: 4

Efficient optical analysis of surface texture combinations for silicon solar cells 硅太阳能电池表面纹理组合的高效光学分析

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2228294

N. Tucher, Johannes Eisenlohr, Peter Kiefel, H. Gebrewold, O. Höhn, H. Hauser, C. Müller, J. Goldschmidt, B. Bläsi

{"title":"Efficient optical analysis of surface texture combinations for silicon solar cells","authors":"N. Tucher, Johannes Eisenlohr, Peter Kiefel, H. Gebrewold, O. Höhn, H. Hauser, C. Müller, J. Goldschmidt, B. Bläsi","doi":"10.1117/12.2228294","DOIUrl":"https://doi.org/10.1117/12.2228294","url":null,"abstract":"Surface textures can significantly improve anti-reflective and light trapping properties of silicon solar cells. Combining standard pyramidal front side textures with scattering or diffractive rear side textures has the potential to further increase the light path length inside the silicon and thereby increase the solar cell efficiency. In this work we introduce the OPTOS (Optical Properties of Textured Optical Sheets) simulation formalism and apply it to the modelling of silicon solar cells with different surface textures at front and rear side. OPTOS is a matrix-based method that allows for the computationally-efficient calculation of non-coherent light propagation within textured solar cells, featuring multiple textures that may operate in different optical regimes. After calculating redistribution matrices for each individual surface texture with the most appropriate technique, optical properties like angle dependent reflectance, transmittance or absorptance can be determined via matrix multiplications. Using OPTOS, we demonstrate for example that the integration of a diffractive grating at the rear side of solar cells with random pyramids at the front results in an absorptance gain that corresponds to a photocurrent density enhancement of 0.73 mA/cm2 for a 250 μm thick cell. The re-usability of matrices enables the investigation of different solar cell thicknesses within minutes. For thicknesses down to 50 μm the simulated gain increases up to 1.22 mA/cm2. The OPTOS formalism is furthermore not restricted with respect to the number of textured interfaces. By combining two or more textured sheets to effective interfaces, it is possible to optically model a complete photovoltaic module including EVA and potentially textured glass layers with one calculation tool.","PeriodicalId":285152,"journal":{"name":"SPIE Photonics Europe","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126371570","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

Rydberg excitation of trapped strontium ions (Conference Presentation) 捕获锶离子的Rydberg激发(会议报告)

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2230062

M. Hennrich, Gerard Higgins, Fabian Pokorny, F. Kress, C. Maier, Johannes Haag, Y. Colombe

{"title":"Rydberg excitation of trapped strontium ions (Conference Presentation)","authors":"M. Hennrich, Gerard Higgins, Fabian Pokorny, F. Kress, C. Maier, Johannes Haag, Y. Colombe","doi":"10.1117/12.2230062","DOIUrl":"https://doi.org/10.1117/12.2230062","url":null,"abstract":"Trapped Rydberg ions are a novel approach for quantum information processing [1,2]. This idea joins the advanced quantum control of trapped ions with the strong dipolar interaction between Rydberg atoms. For trapped ions this method promises to speed up entangling interactions [3] and to enable such operations in larger ion crystals [4]. We report on the first experimental realization of trapped strontium Rydberg ions. A single ion was confined in a linear Paul trap and excited to Rydberg states (25S to 37S) using a two-photon excitation with 243nm and 308nm laser light. The transitions we observed are narrow and the excitation can be performed repeatedly which indicates that the Rydberg ions are stable in the ion trap. Similar results have been recently reported on a single photon Rydberg excitation of trapped calcium ions [5]. The tunability of the 304-309nm laser should enable us to excite our strontium ions to even higher Rydberg levels. Such highly excited levels are required to achieve a strong interaction between neighboring Rydberg ions in the trap as will be required for quantum gates using the Rydberg interaction. References [1] M. Müller, L. Liang, I. Lesanovsky, P. Zoller, New J. Phys. 10, 093009 (2008). [2] F. Schmidt-Kaler, et al., New J. Phys. 13, 075014 (2011). [3] W. Li, I. Lesanovsky, Appl. Phys. B 114, 37-44 (2014). [4] W. Li, A.W. Glaetzle, R. Nath, I. Lesanovsky, Phys. Rev. A 87, 052304 (2013). [5] T. Feldker, et al., arXiv:1506.05958","PeriodicalId":285152,"journal":{"name":"SPIE Photonics Europe","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125656324","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

The rejection of vibrations in adaptive optics systems using a DFT-based estimation method 基于dft的自适应光学系统振动抑制方法

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2227794

D. Kania, J. Borkowski

{"title":"The rejection of vibrations in adaptive optics systems using a DFT-based estimation method","authors":"D. Kania, J. Borkowski","doi":"10.1117/12.2227794","DOIUrl":"https://doi.org/10.1117/12.2227794","url":null,"abstract":"Adaptive optics systems are commonly used in many optical structures to reduce perturbations and to increase the system performance. The problem in such systems is undesirable vibrations due to some effects as shaking of the whole structure or the tracking process. This paper presents a frequency, amplitude and phase estimation method of a multifrequency signal that can be used to reject these vibrations in an adaptive method. The estimation method is based on using the FFT procedure. The undesirable signals are usually exponentially damped harmonic oscillations. The estimation error depends on several parameters and consists of a systematic component and a random component. The systematic error depends on the signal phase, the number of samples N in a measurement window, the value of CiR (number of signal periods in a measurement window), the THD value and the time window order H. The random error depends mainly on the variance of noise and the SNR value. This paper shows research on the sinusoidal signal phase and the estimation of exponentially damped sinusoids parameters. The shape of errors signals is periodical and it is associated with the signal period and with the sliding measurement window. For CiR=1.6 and the damping ratio 0.1% the error was in the order of 10-5 Hz/Hz, 10-4 V/V and 10-4 rad for the frequency, the amplitude and the phase estimation respectively. The information provided in this paper can be used to determine the approximate level of the efficiency of the vibrations elimination process before starting it.","PeriodicalId":285152,"journal":{"name":"SPIE Photonics Europe","volume":"519 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121977121","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

Improvement of solar absorption using submicrometric gratings 利用亚微米光栅改善太阳能吸收

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2225072

M. Bichotte, T. Kämpfe, W. Iff, F. Celle, S. Reynaud, T. Pouit, A. Soum-Glaude, A. Le Gal, L. Dubost, Y. Jourlin

引用次数: 0

Long-distance eye-safe laser TOF camera design 远距离人眼安全激光TOF相机设计

SPIE Photonics Europe Pub Date : 2016-04-29 DOI: 10.1117/12.2227764

A. Kovalev, V. M. Polyakov, V. Buchenkov

引用次数: 3