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Mesoporous TiO₂ based optical sensor for highly sensitive and selective detection and preconcentration of Bi(iii) ions

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CHEMICAL engineering JOURNAL 2014年第0期243卷 509-516页

作者： Faisal, M. Ismail, Adel A. Harraz, Farid A. Bouzid, Hocine Al-Sayari, S. A. Al-Hajry, A. Najran Univ Adv Mat & Nanores Ctr PCSED Najran 11001 Saudi Arabia CMRDI Nanostruct Mat & Nanotechnol Div Cairo 11421 Egypt Najran Univ Coll Arts & Sci Dept Phys Najran 11001 Saudi Arabia Najran Univ Coll Sci & Arts Sharoura Najran 11001 Saudi Arabia

The optical chemosensor technology demands to design a single, preconcentrator based sensing system having higher sensitivity, sufficient selectivity and efficient removal of metal ions with simple operating and recognition methodology. Here we successfully designed mesoporous TiO2,based sensing system which can be utilized as "naked eye" colorimetric sensor with simultaneous removal of the Bi(iii) ions in a single step by strong interaction between TiO2 and [Bi(DZ)(3)] complex. This is explained by the small particle size (10 nm) and large surface area (174 m(2)/g) of mesoporous TiO2, which plays an important role in terms of accessibility and adsorption amount of [Bi-(DZ)(3)] complex. The designed sensing system shows high sensing ability even at trace level concentration of Bi(iii) ion suggesting easier flow of Bi(iii) ion over a wide range of concentrations. The detection limit for Bi(iii) ions is estimated to be similar to 1 ppb. One of the major advantages of current sensing system is the selective sensing performance up to 5000 times higher concentration of interfering cations and anions than that of Bi(iii) ions. This novel approach provides a new route for simultaneous detection and removal Bi(iii) ions in a single step and can be a time and cost alternative tool for environmental safety. (C) 2014 Elsevier B.V. All rights reserved.

关键词： Mesoporous TiO2 optical sensor Detection Preconcentration Bi(iii) ions

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Study of Camera Calibration Process with Ray Tracing 15

Study of Camera Calibration Process with Ray Tracing

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Conference on current developments in Lens design and optical engineering XV

作者： Poulin-Girard, A. -S. Dallaire, X. Veillette, A. Thibault, S. Laurendeau, D. Univ Laval Dept Phys Genie Phys & Opt Ctr Opt Photon & Laser Quebec City PQ G1V 0A6 Canada Univ Laval Dept gen elect & gen informat Lab vision & syst numer Quebec City G1V 0A6 PQ Canada

ISBN: (纸本)9781628412192

Camera calibration is essential for any optical system used to obtain 3D measurements from images. The precision of the 3D depth estimation relies on an appropriate camera model and the accurate estimation of model parameters. These parameters are sensitive to environmental conditions and it is well established that a vision system should be calibrated in operating conditions. This is not always possible since the calibration process is often tedious and time-consuming. Unfortunately, the use of poorly estimated calibration parameters for 3D reconstruction and measurements may lead to suboptimal performance of the system and inaccurate depth estimation. This paper presents a technique using an existing camera model and optical design software to perform calibration simulations. This virtual calibration technique allows for a study of the impact of environmental conditions on the calibration parameters. Using this procedure, it is also possible to predict the statistical behavior of the calibration parameters considering the chosen fabrication processes and tolerances. It can assist vision scientists in the choice of the optical system that best meets the requested precision of the 3D reconstruction. This technique could eventually be integrated in the lens design process to create more reliable optical systems that could be calibrated and used in a range of environmental conditions with a very small variation of their calibration parameters.

关键词： Camera calibration optical design software tolerancing lens design

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Near-infrared imaging equipment that detects small organic substances in thick foods 15

Near-infrared imaging equipment that detects small organic s...

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Conference on current developments in Lens design and optical engineering XV

作者： Phetchalern, Souphaphone Tashima, Hiroto Ishii, Yuya Ishiyama, Takeshi Arai, Shinichi Fukuda, Mitsuo Toyohashi Univ Technol Dept Elect & Elect Engn Toyohashi Aichi 4418580 Japan

ISBN: (纸本)9781628412192

We have developed near-infrared imaging equipment that can detect small organic substances in foodstuffs with thicknesses of more than 1 mm. The equipment is composed of a high output laser diode and a CMOS camera. The irradiated light power distribution was highly uniform with a maximum optical density of 1.3 W/cm(2). A 0.3-mm-diameter wooden stick covered with a 2-mm-thick layer of ham can easily be distinguished in the images. The bones in fish and in chicken wing sticks could also be distinguished. The thicknesses of the fish and the chicken wing sticks were approximately 30 mm and 20 mm, respectively. We eliminated the low spatial frequency components from the images to improve the image contrast.

关键词： near-IR imaging optical equipment food contaminant detection foreign substance spatial frequency filter

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Overview of Diffraction Gratings Technologies for Space-flight Satellites and Astronomy 15

Overview of Diffraction Gratings Technologies for Space-flig...

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Conference on current developments in Lens design and optical engineering XV

作者： Cotel, Arnaud Liard, Audrey Desserouer, Frederic Bonnemason, Francis Pichon, Pierre HORIBA Jobin Yvon SAS F-91165 Longjumeau France

ISBN: (纸本)9781628412192

The diffraction gratings are widely used in Space-flight satellites for spectrograph instruments or in ground-based telescopes in astronomy. The diffraction gratings are one of the key optical components of such systems and have to exhibit very high optical performances. HORIBA Jobin Yvon S.A.S. (part of HORIBA Group) is in the forefront of such gratings development for more than 40 years. During the past decades, HORIBA Jobin Yvon (HJY) has developed a unique expertise in diffraction grating design and manufacturing processes for holographic, ruled or etched gratings. We will present in this paper an overview of diffraction grating technologies especially designed for space and astronomy applications. We will firstly review the heritage of the company in this field with the space qualification of different grating types. Then, we will describe several key grating technologies developed for specific space or astronomy projects: ruled blazed low groove density plane reflection grating, holographic blazed replica plane grating, high-groove density holographic toroidal and spherical grating and transmission Fused Silica Etched (FSE) grism-assembled grating.

关键词： Holographic Ruled Blazed Diffraction Gratings optical Components Low stray light Diffraction Efficiency Reflection Grating

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Nonimaging Achromatic Lens design for LED Direct-lit Backlight Applications 15

Nonimaging Achromatic Lens Design for LED Direct-lit Backlig...

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Conference on current developments in Lens design and optical engineering XV

作者： Tsai, Meng-Che Chen, Bo-Song Lee, Tsung-Xian Natl Taiwan Univ Sci & Technol Grad Inst Appl Sci & Technol 43Sec 4Keelung Rd Taipei 106 Taiwan Natl Taiwan Univ Sci & Technol Grad Inst Color & Illuminat Technol Taipei 106 Taiwan

ISBN: (纸本)9781628412192

Nowadays, light emitting diodes (LEDs) have been widely used in backlight module for display technology. Most of researches tend to improve optical performance in specific applications, such as sufficient efficiency, desired intensity distribution and high illuminance uniformity. However, most of phosphor converted white LEDs have the problem of inducing impure white light. The undesired phenomenon of yellow ring or blue ring becomes more serious through incorrect secondary optical design. In this paper, we emphasize on enhancing the spatial color and illuminance uniformity of LED direct-lit backlight using nonimaging achromatic lens design. We propose a new design method to re-distribute and uniform the ratio of blue and yellow light on the target surface. Moreover, we further apply it in direct-lit LED backlight lens design, in which the uniformity of illuminance on the out coupling surface can be as much as 83.7% and the color uniformity (Delta u'v') is improved to 0.0039. Therefore, the result of high color and illumination uniformity can be achieved simultaneously.

关键词： LED direct-lit backlight Achromatic lens design Illuminance uniformity Color uniformity

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Manufacturing of Freeform Mirror by Milling and Altering its optical Characteristics by Ns-laser Polishing and ALD Coatings 15

Manufacturing of Freeform Mirror by Milling and Altering its...

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Conference on current developments in Lens design and optical engineering XV

作者： Mutanen, Jarkko Kaakkunen, Jarno J. J. Tuovinen, Hemmo Hiltunen, Jouni Kivi, Sini Toiviainen, Maunu Vayrynen, Juha Laukkanen, Janne Prokofiev, Victor Paakkonen, Pertti Juuti, Mikko Kuittinen, Markku Monkkonen, Kari Univ Eastern Finland Inst Photon POB 111 FI-80101 Joensuu Finland BVTT Tech Res Ctr Finland Consolidat & Laser Technol FI-53851 Lappeenranta Finland CVTT Tech Res Ctr Finland FI-70211 Kuopio Finland Karelia Univ Appl Sci Centre Business & Engn FI-80200 Joensuu Finland

ISBN: (纸本)9781628412192

In this study we tested ns-laser and an atomic layer deposition (ALD) for polishing and coating CNC-machined aluminum freeform mirrors that are used in a compact multipoint fiber optical probe. Two types of ALD coatings, aluminum oxide and silicon dioxide were tested. The surface roughness of mirrors was analyzed prior to and after nanosecond-laser polishing and coating them on a Beneq TFS 200 ALD device. The freeform aluminum mirrors with and without coatings were then measured with optical profiler. The results show that improvement in the surface roughness can be seen with ns-laser polished and ALD coated aluminum surfaces.

关键词： Diamond turning ns-laser polishing atomic layer deposition freeform optics

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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current developments in Lens design and optical engineering XV

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Research on properties of an infrared imaging diffractive element 15

Research on properties of an infrared imaging diffractive el...

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Conference on current developments in Lens design and optical engineering XV

作者： Rachon, M. Wegrzynska, K. Doch, M. Kolodziejczyk, A. Siemion, A. Suszek, J. Kakarenko, K. Sypek, M. Warsaw Univ Technol Fac Phys PL-00662 Warsaw Poland

ISBN: (纸本)9781628412192

Novel thermovision imaging systems having high efficiency require very sophisticated optical components. This paper describes the diffractive optical elements which are designed for the wavelengths between 8 and 14 mu m for the application in the FLIR cameras. In the current paper the authors present phase only diffractive elements manufactured in the etched gallium arsenide. Due to the simplicity of the manufacturing process only binary phase elements were designed and manufactured. Such solution exhibits huge chromatic aberration. Moreover, the performance of such elements is rather poor, which is caused by two factors. The first one is the limited diffraction efficiency (c.a. 40%) of binary phase structures. The second problem lies in the Fresnel losses coming from the reflection from the two surfaces (around 50%). Performance of this structures is limited and the imaging contrast is poor. However, such structures can be used for relatively cheap practical testing of the new ideas. For example this solution is sufficient for point spread function (PSF) measurements. Different diffractive elements were compared. The first one was the equivalent of the lens designed on the basis of the paraxial approximation. For the second designing process, the non-paraxial approach was used. It was due to the fact that f/# was equal to 1. For the non-paraxial designing the focal spot is smaller and better focused. Moreover, binary phase structures suffer from huge chromatic aberrations. Finally, it is presented that non-paraxially designed optical element imaging with extended depth of focus (light-sword) can suppress chromatic aberration and therefore it creates the image not only in the image plane.

关键词： infrared diffractive optics extended depth of focus Light Sword optical Element

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Vibration Analysis and Testing for the LLST optical Module 15

Vibration Analysis and Testing for the LLST Optical Module

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Conference on current developments in Lens design and optical engineering XV

作者： Weatherwax, Michele S. Doyle, Keith B. MIT Lincoln Lab Lexington MA 02420 USA

ISBN: (纸本)9781628412192

A lunar orbiting space terminal was recently developed as part of NASA's Lunar Laser Communications Demonstration program. The space terminal uses a 10 centimeter, inertially-stabilized telescope and a 0.5 watt beam to transmit data at up to 622Mbps between the Moon and one of several ground terminals on Earth. Tight coupling between analysis and testing was used to ensure both performance and survival requirements were met in the operational and non-operational vibration environments. Performance requirements were driven by the need to meet a 4.2 mu rad pointing stability requirement in the operational vibration environment. A highly-correlated FEA model was developed using vibration testing to extrapolate the behavior of the system beyond the practical limits of the vibration test bed. The launch load non-operational vibration environment was simulated through both analysis and testing using force-limiting to avoid over designing and over testing the sensitive optics. The iterative and associated challenges of the vibration analysis and testing effort are discussed to show how those efforts helped enable the successful launch, deployment, and ultimately demonstration of NASA's first space laser communications program.

关键词： model correlation finite element analysis (FEA) force limiting vibration testing vibration analysis boundary conditions LLCD lunar laser communications

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Haptic Feedback Teleoperation of optical Tweezers 1

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丛书名： Control, systems and industrial engineering series

2014年

作者： Zhenjiang Ni Céline Pacoret Ryad Benosman Stéphane Régnier

ISBN: (数字)9781119005070

ISBN: (纸本)9781848216952

The authors of this book provide the first review of haptic optical tweezers, a new technique which brings together force feedback teleoperation and optical tweezers. This technique allows users to explore the microworld by sensing and exerting piconewton-scale forces with trapped microspheres. The design of optical tweezers for high-quality haptic feedback is challenging, given the requirements for very high sensitivity and dynamic stability. The concept, design process and specification of optical tweezers reviewed throughout this book focus on those intended for haptic teleoperation. The authors provide two new specific designs as well as the current state of the art. Furthermore, the remaining important issues are identified for further developments. Haptic optical tweezers will soon become an invaluable tool for force feedback micromanipulation of biological samples and nano- and micro-assembly parts.

关键词： optical tweezers Optoelectronics Computer vision Micrurgy

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