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CONF ON SURVEILLANCE TECHNOLOGIES 2

作者： ANAPOL, MI HADFIELD, P TUCKER, T Sensor Systems Group Inc. (United States)

ISBN: (纸本)0819408581

A critical technology area for lightweight SiC-based telescope systems is the structural integrity and thermal stability over spaceborne environmental launch and thermal operating conditions. Note, it is highly desirable to have an inherently athermal design of both SiC mirrors and structure. SSG has developed an 8 inch diameter SiC telescope system for brassboard level optical and thermal testing. The brassboard telescope has demonstrated less than 0.2 waves P-V in the visible wavefront change over +50 C to -200 C temperature range. SSG has also fabricated a SiC truss structural assembly and successfully qualified this hardware at environmental levels greater than 3 times higher than normal Delta, Titan, and ARIES launch loads. SSG is currently developing two SiC telescopes; an 20 cm diameter off-axis 3 mirror re-imaging and a 60 cm aperture on-axis 3 mirror re-imager. Both hardware developments will be tested to flight level environmental, optical, and thermal specifications.

关键词： Silicon carbide Space telescopes Telescopes Mirrors optical fabrication Surveillance Thermography Wavefronts Mirror mounts Mirror structures

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Layered approach to workstation design for medical image viewing

Layered approach to workstation design for medical image vie...

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Medical Imaging VI: PACS design and Evaluation

作者： Haynor, David R.M.D. Zick, Gregory L. Heritage, Marcus B. Kim, Yongmin Univ. of Washington Seattle WA USA

ISBN: (纸本)0819408069

Software engineering principles suggest that complex software systems are best constructed from independent, self-contained modules, thereby maximizing the portability, maintainability and modifiability of the produced code. This principal is important in the design of medical imaging workstations, where further developments in technology (CPU, memory, interface devices, displays, network connections) are required for clinically acceptable workstations, and it is desirable to provide different hardware platforms with the 'same look and feel' for the user. In addition, the set of desired functions is relatively well understood, but the optimal user interface for delivering these functions on a clinically acceptable workstation is still different depending on department, specialty, or individual preference. At the University of Washington, we are developing a viewing station based on the IBM RISC/6000 computer and on new technologies that are just becoming commercially available. These include advanced voice recognition systems and an ultra-high-speed network. We are developing a set of specifications and a conceptual design for the workstation, and will be producing a prototype. This paper presents our current concepts concerning the architecture and software system design of the future prototype. Our conceptual design specifies requirements for a Database Application Programming Interface (DBAPI) and for a User API (UAPI). The DBAPI consists of a set of subroutine calls that define the admissible transactions between the workstation and an image archive. The UAPI describes the requests a user interface program can make of the workstation. It incorporates basic display and image processing functions, yet is specifically designed to allow extensions to the basic set at the application level. We will discuss the fundamental elements of the two API's and illustrate their application to workstation design.

关键词： Computer workstations

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optical signal acquisition and processing in future accelerator diagnostics

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AIP Conference Proceedings 1992年第1期279卷 821-833页

作者： Gerald P. Jackson Alizon Elliott Fermi National Accelerator Laboratory MS 341 P.O. Box 500 Batavia IL 60510 Univeristy of Illinois at Chicago Dept. of Electrical Engineering Chicago IL 60607

Beam detectors such as striplines and wall current monitors rely on matched electrical networks to transmit and process beam information. Frequency bandwidth, noise immunity, reflections, and signals to noise ratio are considerations that require compromises limiting the quality of the measurement. Recent advances in fiber optics related technologies have made it possible to acquire and process beam signals in the optical domain. This paper describes recent developments in the application of these technologies to accelerator beam diagnostics. The design and construction of an optical notch filter used for a stochastic cooling system is used as an example. Conceptual ideas for future beam detectors are also presented.

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Adaptive thresholding and windowing in realtime hultispectral correlation 2

Adaptive thresholding and windowing in realtime hultispectra...

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Surveillance Technologies ii 1992

作者： Stephenson, Gary V. Winterberg, John J. Bartel, Bart A. Hedden, Richard L. Hughes Aircraft Company Electro-optical and Data Systems Group El SegundoCA90245 United States

Both thresholding and windowing are important tools in the reduction of false alarm rates in high sensitivity point source detection and correlation sensor signal processors. In a variable background environment, adaptive thresholding is required to maintain a constant false alarm rate, and in a variable target environment, adaptive windowing is helpful in controlling false alarm rate, while maintaining correlation performance. Several issues arise when applying adaptive detection thresholding and windowing in a scanning infrared sensor processor. Choice of control loops for both thresholding and windowing should be such that instabilities caused by interactions between them are minimized. Instabilities in operation can also occur due to the various states of the system itself, such as scanning state changes or gain mode changes. The current presentation will describe the application of adaptive thresholding and windowing in the sensor subsystem design of the Airborne Surveillance Testbed. Control loop closure choices will be outlined for both thresholding and windowing, and their effect on false alarm rate and correlation will be covered. The correction of scanning state and gain mode effects on thresholding will also be addressed, as well as the impact on correlation performance. © 1992 SPIE. All rights reserved.

关键词： Scanning

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OVERVIEW OF EUROPEAN developments IN DIGITAL PHOTOGRAMMETRIC WORKSTATIONS

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PHOTOGRAMMETRIC engineering AND REMOTE SENSING 1992年第1期58卷 51-56页

作者： DOWMAN, IJ EBNER, H HEIPKE, C TECH UNIV MUNICH CHAIR PHOTOGRAMMETRY & REMOTE SENSING W-8000 MUNICH 2 GERMANY

The current position of European Softcopy or Digital Photogrammetric Workstations (DPWS) in terms of operational systems as well as research and development activities is reviewed. European manufacturers (Leica, Matra, Galileo Siscam) have made significant strides in developing universal type DPWS for topographic applications. Operational close-range DPWS include the MAP VISION system and the Rolleimetric RS product line. European mapping organizations such as the Ordnance Survey (United Kingdom), the Institut Geographique National (France), the Institut Cartografic de Catalunya (Spain), the Landesvermessungsamt Nordrhein-Westfalen (Germany), and Eurosense (Belgium) have made first steps in using DPWS in the production environment, mainly for the automatic computation of digital terrain models and for orthoprojection. Within the universities there has been considerable research activity concerning design issues of DPWS, often focusing on specific applications. For example, work is in progress in Berlin, Glasgow, Hannover, and London on topographic applications, in Braunschweig and Zurich on close-range applications, and in Graz, London and Oberpfaffenhofen on radargrammetry. Similarly, a body of work on algorithmic aspects of DPWS has been carried out in Bonn, Darmstadt, Delft, Enschede, Karlsruhe, Lausanne, Munich, Stockholm, Stuttgart, and Zurich. These activities are reviewed and lead to a number of conclusions on the state-of-the-art and on future trends. The major ones are A DPWS is and will remain an interactive workstation, where the human operator handles less and less routine work, but stays responsible for verification and control. Digital orthoprojection is on the verge of becoming widely used in practice. Image matching techniques are applied in a number of DPWS for small-scale applications. The use of operational image understanding methods in DPWS has not yet been achieved. The incorporation of data from different sources, for example, optical and micr

关键词： Photogrammetry

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current developments in optical design and optical engineering

Current Developments in Optical Design and Optical Engineeri...

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current developments in optical design and optical engineering 1991

The proceedings contain 54 papers. The topic discussed include: global optimization using the y-ybar diagram;two-mirror projection systems for simulating telescopes;two-mirror projection systems for simulating telescopes;surface contributions of the wave aberrations up to the eighth degree;membrane light modulators: engineering design considerations;plastic lens array with the function of forming unit magnification erect image using roof prisms;spatial frequency selective error sensing for space-based, wide field-of-view, multiple-aperture imaging systems;novel interferometer setup for evaluating the sum of surface contributions to transmitted wavefront distortion;and alignment of an aspheric mirror subsystem for an advanced infrared catadioptric system.

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MEMBRANE LIGHT MODULATORS - engineering design CONSIDERATIONS

MEMBRANE LIGHT MODULATORS - ENGINEERING DESIGN CONSIDERATION...

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5TH CONF ON current developments IN optical design AND optical engineering

作者： OMARA, D SCHILLER, CM WARDE, C Optron Systems Inc. (United States)

ISBN: (纸本)0819406554

Geometric parameters such as fill-factor, pixel shape, and array symmetry strongly affect the performance of membrane light modulators. A set of modeling tools that allow device performance evaluation as a function of these parameters have been developed. The models predict the effect of varying a given parameter and allow visualization of the result. The current modeling results are in good agreement with experimental observation and have formed the basis for computer-aided design of future generations of such devices.

关键词： Modulators Instrument modeling Diffraction Performance modeling Fourier transforms optical design optical engineering Solid modeling Statistical modeling Computer aided design

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CRITICAL ANGLE REFRACTOMETRY - ACCURACY ANALYSIS

CRITICAL ANGLE REFRACTOMETRY - ACCURACY ANALYSIS

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5TH CONF ON current developments IN optical design AND optical engineering

作者： TENTORI, D CICESE (United States)

An analysis of the measuring accuracy that can be obtained using critical angle refractometry as a direct and an indirect method is made. The working conditions required to get the highest accuracy are discussed.

ISBN: (纸本)0819406554

关键词： Prisms Refractive index Error analysis Refractometry optical engineering optical design Polishing Tolerancing Ray tracing Solids

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IMAGE PLANE TILT IN optical-SYSTEMS

IMAGE PLANE TILT IN OPTICAL-SYSTEMS

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5TH CONF ON current developments IN optical design AND optical engineering

作者： SASIAN, JM AT&T Bell Labs. (United States)

Mathematical expressions are presented to relate object and image plane tilts in nonaxially symmetric systems. Examples that illustrate the use of these expressions are given. Keystone distortion is described and quan... 详细信息

ISBN: (纸本)0819406554

关键词： Distortion Geometrical optics Monochromatic aberrations optical design optical engineering Systems modeling Imaging systems Mirrors Prisms Spherical lenses

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COMMENTS ON THE SEIDEL ABERRATION THEORY

COMMENTS ON THE SEIDEL ABERRATION THEORY

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5TH CONF ON current developments IN optical design AND optical engineering

作者： KANG, SG LU, KC ZHU, YF Harbin Institute of Technology (China)

The expressions of the Seidel aberration theory are comparatively simple and easy to use due to its characteristics and prerequisites. Meanwhile, the effective range of the theory is limited also due to its prerequisi... 详细信息

ISBN: (纸本)0819406554

关键词： Aberration theory Monochromatic aberrations Geometrical optics Optics manufacturing optical design optical engineering Analytical research Spherical lenses Information technology Lutetium

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