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Transmittance of aqueous solutions with heavy metals in the UV range

Transmittance of aqueous solutions with heavy metals in the ...

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International conference on Electrical engineering, Computing Science and Automatic Control (CCE)

作者： C. Chávez M. Aceves J. Pedraza Department of Electronic INAOE Tonatzintla Puebla Mexico

ISBN: (纸本)9781457710117

Heavy metals in water are a health problem that requires developing economical detection methods. this paper presents experimental results of the transmittance of aqueous solutions with heavy metals in the UV range. Aqueous solutions were made of Cadmium, Zinc, Lead, Copper and Manganese at different concentrations. the measurements of transmittance of these solutions were done in the range from 200 to 400 nm. It is very important to mention that the transmittance is perfectly discernible from one to another solution and can be used to determine qualitatively and quantitatively the presence of such metals. the characterization of transmittance was done for heavy metals concentrations of 100 ppm to 10,000 ppm. the purpose of this work is to design and build an efficient, economical and portable electronic system to detect heavy metals contamination in water. However, in this report only the optical characteristics are presented.

关键词： Water pollution Cadmium Pollution measurement current measurement Copper Contamination

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A novel single-stage high power LEDs driver

A novel single-stage high power LEDs driver

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International conference on Power Electronics (ICPE)

作者： Chun-An Cheng Fu-Li Yang Chen-Wei Ku Chun-Hsien Yen Power Electronics Laboratory Department of Electrical Engineering I-Shou University Taiwan

the conventional two-stage driver for high-power light-emitting-diodes (LEDs) is composed of a power-factor-correction (PFC) converter with a buck converter or a flyback converter for adjusting the voltage/current for supplying LEDs. However, large numbers of circuit components are required and the total efficiency is limited due to two-stage power conversion. this paper proposes a single-stage dimmable driver for high-power-rated LEDs. the presented circuit combines a buck-boost PFC converter with a flyback converter into a single-stage power-conversion circuit. the proposed driver offers high power factor, high efficiency, cost-effectiveness and a constant-output-voltage control scheme. Finally, a prototype driver is developed and tested in order to supply 100W LEDs with universal utility-line input voltages. Operational analysis, design equations, a design example, and experimental results demonstrate the feasibility of the proposed circuit.

关键词： Light emitting diodes Driver circuits Inductors Voltage measurement optical switches Capacitors

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A 32Gbps low propagation delay 4×4 switch IC for feedback-based system in 0.13μm CMOS technology 11

A 32Gbps low propagation delay 4×4 switch IC for feedback-b...

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Asia and South Pacific design Automation conference

作者： Yu-Hao Hsu Yang-Syu Lin Ching-Te Chiu Jen-Ming Wu Shuo-Hung Hsu Fan-Ta Chen Min-Sheng Kao Wei-Chih Lai YarSun Hsu National Tsing Hua University Hsinchu TW Institute of Communications Engineering National Tsing Hua University Hsinchu Taiwan

ISBN: (纸本)9781424475162

In this paper, a low propagation delay, low power, and area-efficient 4×4 load-balanced switch circuit for feedback-based system is presented. In this periodic and deterministic switch, only two DFFs are used to implement a pattern generator which is a O(N 3 ) hardware complexity in traditional matching algorithm based N×N switch. For packet reordering, a feedback path is established in series of symmetric patterns. As comparing with commercial switch systems, we implement a 4×4 switch IC directly in high speed domain without the use of SERDES interfaces to achieve low propagation delay and high scalability. In CML output buffer, PMOS active load and active back-end termination are introduced. A stacked current source and symmetric topology in CML-DFF are adopted. From our results, this work efficiently deducted 28ns propagation delay, 80% area and 80% power introduced by the SERDES interface. the throughput rate is up to 32Gbps (8Gbps/Ch).

关键词： optical switches Integrated circuits Switching circuits Propagation delay Generators throughput

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Bound-Abrasive Grinding and Polishing of Surfaces of optical Materials

Bound-Abrasive Grinding and Polishing of Surfaces of Optical...

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conference on current developments in Lens design and optical engineering XI - and Advances in thin Film Coatings VI

作者： Filatov, Yuriy D. Filatov, Olexandr Yu Monteil, Guy Heisel, Uwe Storchak, Michael Natl Acad Sci Ukraine Bakul Inst Superhard Mat 2 Avtozavodskaya UA-04074 Kiev Ukraine Natick Res Dev & Engn Ctr F-25000 Besancon France Univ Stuttgart D-70174 Stuttgart Germany

ISBN: (纸本)9780819482822

Problems of improving efficiency and quality of diamond-abrasive finishing of optical materials by tools with bounded polishing powders, including diamond powder, by means of the improvement of the machining technology and application of new tools with functionally oriented designs and characteristics of working layer are considered. A model has been proposed of the slime particle formation and directional removal as well as of the generation of a high-quality surface in diamond-abrasive finishing of optical materials taking into account the peculiarities of the mass transfer in the contact zone and statistic character of the distribution of slime particles by size. the dependences of the particle number on the diffusion angle and coordinate of the contact have been derived in the studies of the dynamics of collision and diffusion of slime particles. the coordinate dependence of the flat surface roughness of glass K8 optics in fine diamond grinding has been described. Interaction and dispersion of deterioration particles in a contact zone of the tool and a processed sample in the course of polishing is described and the dispersion structure of deterioration particles of the tool on slime particles and on deterioration particles is explained oscillatory. It is shown, that differential dispersion section of deterioration particles on slime particles no less than on deterioration particles as much as possible at corners of dispersion close to 0 and 180o on the central sites of a contact zone. Coordinate dependence of full dispersion section of deterioration particles of the tool and dependence of microprofile height of the processed surface on circular zones radius are calculated. Conformity of experimental and theoretical microroughness profiles of a polished surface on a quartz sample is shown.

关键词： Grinding Polishing optical materials Slime particles Collision Diffusion Roughness

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Flat liquid crystal diffractive lenses with variable focus and magnification

Flat liquid crystal diffractive lenses with variable focus a...

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conference on current developments in Lens design and optical engineering XI - and Advances in thin Film Coatings VI

作者： Valley, Pouria Dodge, Mohammad Reza Schwiegerling, Jim Mathine, David Peyman, Gholam Peyghambarian, N. Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9780819482822

Non-mechanical variable lenses are important for creating compact imaging devices. Various methods employing dielectrically actuated lenses, membrane lenses, and/or liquid crystal lenses were previously proposed(1-4). Here we present tunable-focus flat liquid crystal diffractive lenses (LCDL) employing binary Fresnel zone electrodes fabricated on Indium-Tin-Oxide using conventional micro-photolithography. the phase levels can be adjusted by varying the effective refractive index of a nematic liquid crystal sandwiched between the electrodes and a reference substrate. Using a proper voltage distribution across various electrodes the focal length can be changed. Electrodes are shunted such that the correct phase retardation step sequence is achieved. If the number of 2 pi zone boundaries is increased by a factor of m the focal length is changed from f to f/m based on the digitized Fresnel zone equation: f = r(m)(2)/2m lambda, where r(m) is m(th) zone radius, and lambda is the wavelength. the lenses operate at very low voltage levels (+/- 2.5V ac input), exhibit fast switching times (20-150 ms), can have large apertures (> 10 mm), and small form factor, and are robust and insensitive to vibrations, gravity, and capillary effects that limit membrane and dielectrically actuated lenses. Several tests were performed on the LCDL including diffraction efficiency measurement, switching dynamics, and hybrid imaging with a refractive lens. Negative focal lengths are achieved by adjusting the voltages across electrodes. Using these lenses in combination, magnification can be changed and zoom lenses can be formed. the promising results make LCDL a good candidate for non-mechanical auto-focus and zoom lenses.

关键词： Diffractive lenses Liquid-crystal devices Active or adaptive optics Non-mechanical optical zoom Auto-focus Telescopes

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the automatic image inspection system for measuring dimensional parameters of a saw blade

The automatic image inspection system for measuring dimensio...

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2010 8th IEEE International conference on Control and Automation, ICCA 2010

作者： Wang, Yung-Cheng Lin, Jui-Chang Chiu, Shih-Fong Institute of Mechanical Engineering National Yunlin University of Science and Technology Douliou 640 Yunlin Taiwan Institute of Mechanical Design Engineering National Formosa University Huwei 632 Yunlin Taiwan

ISBN: (纸本)9781424451951

For ensuring the product quality under the condition of high-speed automatic production, the tendency with the aid of automatic inspection has grown rapidly, because of its benefits of promoted efficiency, higher precision and cost down. Image measurement and analysis have been integrated in automatic optical inspection (AOI) technology which can be substituted for many current manual measurements procedures. With the image measurement system, measurement performance and efficiency can be obviously enhanced. In this investigation, correlative image measurement theories, hardware equipments and self-developed program have been utilized to build a measurement system for the determination of dimensional parameters of a saw blade. Measured parameters include tooth pitch, tooth root depth, tooth shape radius of curvature, and angle of clearance. Measurement system analysis (MSA) is used to calculate standard deviation. By precision block gauges and angle gauges, comparison between MSA and gauges have been performed to verify the accuracy of the developed system. the dimensional parameters of a saw blade obtained from this measurement system are available to diagnose the saw blade quality and for quantitative analysis. It will be benefic for accuracy promotion and production efficiency in manufacturing processing of saw blades. © 2010 IEEE.

关键词： Gage blocks

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design and implementation of HDL modules and circuits for underwater optical wireless communication

Design and implementation of HDL modules and circuits for un...

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作者： Anguita, Davide Brizzolara, Davide Parodi, Giancarlo University of Genova Department of Biophysical and Electronic Engineering Via Opera Pia 11A Genova Italy

ISBN: (纸本)9789549260021

Underwater wireless optical communication has been used for establish a link between mobile vehicles and/or fixed nodes because light, especially in the blue/green region, allows to achieve higher data-rate than acoustical or electromagnetic waves for moderate distances. the here proposed work has the aim to pave the way for diffuse optical communication allowing to support optical communication in an Underwater Wireless Sensor Network of dense-deployed fixed nodes for specific application, such as monitoring and surveillance, for shallow, coastal and inland water in the case of moderate/limited area. the use of light impulse for communication is motivated by the possibility of targeting high data-rate, low-cost and small dimension components. this paper describes an overall vision of the system: a HDL implementation of flexible modules for the management of optical communication (based on IEEE 802.15.4 and IEEE 802.11 standard) which target the interface with current terrestrial technology for Wireless Sensor Networks;the design and implementation of circuits for underwater optical point-to-point and planar communication. the preliminary results and design consideration are reported considering also future possible developments.

关键词： optical communication

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Recent developments in Optimizing optical Tools for Air Bubble Detection in Medical Devices Used in Fluid Transport

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13th International conference on Biomedical engineering (ICBME)

作者： Ravichandran, S. Shanthini, R. Naadhirah, R. R. Nur Yikai, W. Deviga, J. Prema, M. Clinton, L. Temasek Polytech Temasek Engn Sch Singapore 529757 Singapore

ISBN: (纸本)9783540928409

Modelling techniques for optimizing bubble detection tools in the infrared band used in conjunction with a drug transport mechanism for the transport of intravenous fluids in clinical practice have been evaluated qualitatively using simulation techniques. Sensors which are used in signal processing often have limitation when they are made to work in noisy environment. Noise in the working environment can be from various sources such as from power line, high frequency RF fields and background luminance. In case of certain optical sensors, coupling schemes and the interference from devices which are in close proximity to the sensors can also contribute to significant noise. Qualitative studies on the effect of background luminance noise have provided a good understanding on the degree of susceptibility of the optoelectronic receiver for various luminance noises resulting in interferences in the output of a tool developed for the detection of air bubbles in fluid pathways called the "optical Bubble Detection Tool". Experience gained from the earlier studies has provided the required knowledge for developing a design which is less susceptible to external disturbances. the dynamic excitation method for the "optical Bubble Detection Tool" was introduced by modifying the electronic interface of the earlier "optical Bubble Detection Tool". this was easily achieved by understanding the requirements of the pulsed current for energizing the transmitter of the "optical Bubble Detection Tool". As the frequency of excitation and the intensity of the emitted infrared are factors which decide the resolution and sensitivity of the "optical Bubble Detection Tool", it was optimized for several operating environments which are under the influence of other external radiations in the visible range and non-visible range.

关键词： Bubble detection tool Background luminance noise optical sensors

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design of a real-time pyrosequencer by bioluminometric assay coupled with photodiode array

Design of a real-time pyrosequencer by bioluminometric assay...

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8th International conference on Photonics and Imaging in Biology and Medicine, PIBM 2009

作者： Chen, Haifeng Liang, Chao Li, Chuanjun Li, Cheng Ge, Jianhui Zhang, Yuming Zhou, Guohua Huadong Research Institute for Medicine and Biotechnics Nanjing 210002 China State Key Laboratory of Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Science Beijing 100083 China

ISBN: (纸本)9780819479082

Objective: A system for real-time pyrosequencing by biolumino-metric assay coupled with a photodiode array is presented. the approach is based on the detection of DNA polymerase activity by an enzymatic luminometric inorganic pyrophosphate (PPi) detection assay. It is designed to offer a convenient pyrosequencing-based platform for DNA sequencing with low cost and simple structure. Method: Together with the automated dNTPs micro-dispensers, a photoelectric conversion circuit with high sensitive photodiode S1133-01 and ultra-low bias current monolithic operational amplifier OPA129 is chosen to detect the luminometric, monitoring the ATP production continuously. the signal to noise ratio is improved efficiently by routing PCB and shielding carefully. Results: A C14 standard light source is selected to compare the sensitivity of the system to the photomultiplier tubes (PMT). the results show that the magnification of the circuits is ten times higher than the PMT, which is sufficient for detecting the DNAs as small as 10 fmol. Four different type of dNTPs are injected into the reaction cell in turn and the peak of luminescence illuminates the result, which is coinciding with the commercial system. Conclusion: the system is small, simple and inexpensive, which is enough for real-time pyrosequencing. But there are many works to do to construct the fast and high-flux DNA sequencing system. © 2009 Copyright SPIE - the International Society for optical engineering.

关键词： Photomultipliers

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A low-voltage low-power comparator with current-controlled dynamically-biased preamplifiers for DCM buck regulators

A low-voltage low-power comparator with current-controlled d...

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2009 16th IEEE International conference on Electronics, Circuits and Systems, ICECS 2009

作者： Lee, Hoi Department of Electrical Engineering University of Texas at Dallas Richardson TX 75080-3021 United States

ISBN: (纸本)9781424450916

Comparator-controlled power switch has been widely used to improve power efficiencies of discontinuous-conductionmode (DCM) buck regulators. Some major design challenges are capabilities oy the comparator to operate at low voltage and dissipate low power for low-voltage DCM buck regulators having high power efficiencies under light-load condition. this paper presents a new comparator with current-controlled dynamicallybiased preamplifiers. current-controlled dynamic biasing (CCDB) is developed to lowe. the required supply voltage for realizin. the autozeroing technique i. the preamplifier, thereby allowin. the proposed comparator to operate at lower supply voltage compared to that using conventional preamplifiers. the proposed CCDB technique also minimize. the current consumption oy the comparator under different input amplitudes. Implemented in a standard 0.35-μm CMOS process with Vthn ≈ |Vthp| = 0.7 V. the comparator can operate down to 1.2 V and achieve 8-bit resolution at 20 MS/s while only consuming 7-μA current. ©2009 IEEE.

关键词： Comparators (optical)

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