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检索条件"任意字段=Current Developments in Optical Design and Optical Engineering 1991"

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optical design of endoscopic shape-tracker using quantum dots embedded in fiber bundles

Optical design of endoscopic shape-tracker using quantum dot...

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SPIE optical engineering + Applications

作者： Eisenstein, Jessica Gavalis, Robb Wong, Peter Y. Cao, Caroline G. L. Department of Mechanical Engineering Tufts University MA United States

ISBN: (纸本)9780819477194

Colonoscopy is the current gold standard for colon cancer screening and diagnosis. However, the near-blind navigation process employed during colonoscopy results in endoscopist disorientation and scope looping, leading to missed detection of tumors, incorrect localization, and pain for the patient. A fiber optic bend sensor, which would fit into the working channel of a colonoscope, is developed to aid navigation through the colon during colonoscopy. The bend sensor is comprised of a bundle of seven fibers doped with quantum dots (QDs). Each fiber within the bundle contains a unique region made up of three zones with differently-colored QDs, spaced 120° apart circumferentially on the fiber. During bending at the QD region, light lost from the fiber's core is coupled into one of the QD zones, inducing fluorescence of the corresponding color whose intensity is proportional to the degree of bending. A complementary metal oxide semiconductor camera is used to obtain an image of the fluorescing end faces of the fiber bundle. The location of the fiber within the bundle, the color of fluorescence, and the fluorescence intensity are used to determine the bundle's bending location, direction, and degree of curvature, respectively. Preliminary results obtained using a single fiber with three QD zones and a seven-fiber bundle containing one active fiber with two QDs (180° apart) demonstrate the feasibility of the concept. Further developments on fiber orientation during bundling and the design of a graphical user interface to communicate bending information are also discussed. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Fibers

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Development of tissue multi-slice laser reflectance imaging system

Development of tissue multi-slice laser reflectance imaging ...

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SPIE optical engineering + Applications

作者： Indumathi, J. Singh, Megha Division of Biomedical Engineering VIT University Vellore - 632014 India

ISBN: (纸本)9780819477194

For early detection of abnormalities growing within the healthy tissues a laser based multi-slice reflectance measurement technique is developed. The laser light is guided at the center of the probe. Around this the photo-detectors are arranged symmetrically at various distances from the beam entry point. The optical radiations after scattering within the tissue emerge at various locations which are detected by the detectors. After conversion from current to voltage these signals are digitized and fed to computer. After pre-processing of the backscattered signals from 36 photo-detectors arriving from various locations the reflectance images are reconstructed. As the detectors are placed at various distances from the beam entry point in the form of rings, their respective images are obtained. These multi-slices images provide variation in composition at various depths ranging from 2 - 7.5mm. Thus by placing the probe just once the required data for images reconstruction is obtained. This is in contrast to earlier developments as this does not involve the movement of the probe for image reconstruction. Based on the sequence of images from various depths a three - D image of the tissue structure could also be obtained. © 2009 Copyright SPIE - The International Society for optical engineering.

关键词： Probes

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

引用

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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MATISSE-v1.5 and MATISSE-v2.0: New developments and comparison with MIRAMER measurements

MATISSE-v1.5 and MATISSE-v2.0: New developments and comparis...

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Infrared Imaging Systems: design, Analysis, Modeling, and Testing XX

作者： Simoneau, Pierre Caillault, Karine Fauqueux, Sandrine Huet, Thierry Labarre, Luc Malherbe, Claire Rosier, B. ONERA Applied and Theoretical Optics Department Chemin de la Huniére 91761 Palaiseau Cedex France

ISBN: (纸本)9780819475664

MATISSE is a background scene generator developed for the computation of natural background spectral radiance images and useful atmospheric radiatives quantities (radiance and transmission along a line of sight, local illumination, solar irradiance .). The spectral bandwidth ranges from 0.4 to 14 üm. Natural backgrounds include atmosphere (taking into account spatial variability), low and high altitude clouds, sea and land. The current version MATISSE-v1.5 can be run on SUN and IBM workstations as well as on PC under Windows and Linux environment. An IHM developed under Java environment is also implemented. MATISSE-v2.0 recovers all the MATISSE-v1.5 functionalities, and includes a new sea surface radiance model depending on wind speed, wind direction and the fetch value. The release of this new version in planned for April 2009. This paper gives a description of MATISSE-v1.5 and MATISSE-v2.0 and shows preliminary comparison results between generated images and measured images during the MIRAMER campaign, which hold in May 2008 in the Mediterranean Sea. ©2009 SPIE.

关键词： Surface waters

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current status of closed-form Green's functions in layered media composed of natural and artificial materials

Current status of closed-form Green's functions in layered m...

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International Conference on Electromagnetics in Advanced Applications (ICEAA)

作者： M. I. Aksun Aytac Alparslan K. A. Michalski Department of Electrical and Electronics Engineering Koc University Istanbul Turkey Department of Information Technology and Electrical Engineering Swiss Federal Institute of Technology Zurich Switzerland Department of Electrical and Computer Engineering Texas A and M University College Station TX USA

This paper provides an overview of the development of closed-form Green's functions in planar multilayered structures, with an emphasis given to the discrete complex image method (DCIM). In addition to the review of the materials in the literature, the latest developments on DCIM and its applications to artificial materials are also discussed.

关键词： Green's function methods Nonhomogeneous media Algorithm design and analysis Sampling methods Closed-form solution Surface fitting optical design Radio frequency High speed optical techniques Microwave circuits

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An optically passive athermal infrared optical system

An optically passive athermal infrared optical system

引用

Conference on current developments in Lens design and optical engineering IX

作者： Li, Hua Shen, Mangzuo Chinese Acad Sci Inst Opt & Elect Chengdu 610041 Sichuan Prov Peoples R China

ISBN: (纸本)9780819472809

An optically passive athermal infrared optical system working in the 8 - 12 micron long wavelength infrared band was designed by using a special infrared optical material AMTIR (amorphous material transmitting infrared radiation). The design principle, design results are described in this paper. In addition, the optical system was incorporated with an infrared focal plane array forming an infrared camera. The thermal test of imaging quality of this camera is also presented

关键词： infrared optical system optical design athermal optical system

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optical design of reflective wide-field cameras

Optical design of reflective wide-field cameras

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Conference on current developments in Lens design and optical engineering IX

作者： Sasian, Jose Univ Arizona Coll Opt Sci Tucson AZ 85721 USA

ISBN: (纸本)9780819472809

This paper discusses some methodologies that apply to the optical design of reflective wide-field cameras. Among the methods considered are off-axis and eccentric pupil systems, concatenation of systems, tilted component systems, aberration theory, and confocal systems. The goal of the paper is to review design methods. In particular some systems are shown to illustrate two methodologies.

关键词： optical design mirror design wide-field reflective optics unobscured

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New tools for the lens designer

New tools for the lens designer

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Conference on current developments in Lens design and optical engineering IX

作者： Dilworth, Donald C. Optical Systems Design Inc. (United States)

ISBN: (纸本)9780819472809

Several common impediments to successful lens design can be removed by application of new techniques. These involve using information that has long been calculated during the design process, but then discarded. Problems so addressed include the nuisance of discovering ray failures in the starting configuration, and that of tolerance desensitization, among others.

关键词： Lens optimization ray failures tolerance desensitization starting point stop position avoiding strain

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Automated design and fabrication of ocular optics

Automated design and fabrication of ocular optics

引用

Conference on current developments in Lens design and optical engineering IX

作者： Gutin, Mikhail Gutin, Olga Appl Sci Innovat Inc Troy NY 12180 USA

ISBN: (纸本)9780819472809

Automated computer-aided procedure for component selection, optical design, and optimization was developed and used to produce prototype ocular optics of a head-mounted display for biomedical imaging, with the field of view and resolution approaching those of normal human vision. The new display has the potential to dramatically increase the amount and fidelity of real-time visual information presented to the user. The selected approach was based on a tiled configuration and "optically stitched" virtual image, resulting in seamless imagery generated by multiple micro-displays. Several optical configurations were studied in the design stage, to arrive at the optimal optical layout. The automated procedure provided for extensive search of the best candidate stock components out of thousands of candidate lenses offered by different vendors. At each iteration, the candidate lens was "digitally inserted" in the optical layout, its position was optimized, and the achieved merit function characterizing the quality of the stitched image was stored, along with the design prescription. A few best designs were then closely evaluated in a traditional "manual" procedure. The design effort was followed by experimental demonstration and tests of a limited prototype optical system.

关键词： optical design lens design head mounted display HMD

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Modeling diffractive optical elements in hybrid systems with the effect of the material dispersion

Modeling diffractive optical elements in hybrid systems with...

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Conference on current developments in Lens design and optical engineering IX

作者： Zhang, Hu Liu, Hua Lu, Zhenwu Zhang, Hongxin Ni, Zhengguo Chinese Acad Sci State Key Lab Appl Opt Changchun Inst Opt Fine Mech & Phys Changchun 130033 Peoples R China Chinese Acad Sci Grad Sch Beijing 100039 Peoples R China Aviat Univ Air Force Changchun 130022 Peoples R China

ISBN: (纸本)9780819472809

The diffractive optical element (DOE) is always modeled as an ideal pure diffractive clement which neglects the refractive dispersion of the clement's material. In this paper, a new model of the diffractive optical element is proposed, in which the effect of the refractive dispersion of the DOE's material is considered. The new model is explained and compared with standard diffraction-order expansion with the help of a hybrid system example. The analytical results show that the new model has an important meaning for the exact analysis of the hybrid refractive-diffractive optical system.

关键词： Diffractive optical clement material dispersion hybrid optical systems optical design

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