Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

More documents

Recommendations

Info

The nuclear collective response is investigated in the framework of a door way picture in which the spreading width of the collective emotion is described as a coupling to more and more complex configurations. It is shown that this coupling induces fluctuations of the observed strength. In the case of a hierarchy of overlapping decay channels, Ericson fluctuations are observed at different scales. Methods for extracting these scales and the related lifetimes are discussed. Finally, it is shown that the coupling of different states at one level of complexity to some common decay channels at the next level, may produce interference-like patterns in the nuclear response. This quantum effect leads to a new type of fluctuations with a typical width related to the level spacing. NTIS Nuclear Physics; Responses; Variations 198 74 OPTICS �� 20000062729 NASA Goddard Space Flight Center, Greenbelt, MD USA Overcoming Dynamic Disturbances in Imaging Systems Young, Eric W., NASA Goddard Space Flight Center, USA; Dente, Gregory C., GCD Associates, USA; Lyon, Richard G., NASA Goddard Space Flight Center, USA; Chesters, Dennis, NASA Goddard Space Flight Center, USA; Gong, Qian, Swales Aerospace, USA; [2000]; 11p; In English; Computational Optics and Imaging, 10-12 May 2000, Greenbelt, MD, USA; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche We develop and discuss a methodology with the potential to yield a significant reduction in complexity, cost, and risk of spaceborne optical systems in the presence of dynamic disturbances. More robust systems almost certainly will be a result as well. Many future space-based and ground-based optical systems will employ optical control systems to enhance imaging performance. The goal of the optical control subsystem is to determine the wavefront aberrations and remove them. Ideally reducing an aberrated image of the object under investigation to a sufficiently clear (usually diffraction-limited) image. Control will likely be distributed over several elements. These elements may include telescope primary segments, telescope secondary, telescope tertiary, deformable mirror(s), fine steering mirror(s), etc. The last two elements, in particular, may have to provide dynamic control. These control subsystems may become elaborate indeed. But robust system performance will require evaluation of the image quality over a substantial range and in a dynamic environment. Candidate systems for improvement in the Earth Sciences Enterprise could include next generation LANDSAT systems or atmospheric sensors for dynamic imaging of individual, severe storms. The technology developed here could have a substantial impact on the development of new systems in the Space Science Enterprise; such as the Next Generation Space Telescope(NGST) and its follow-on the Next NGST. Large Interferometric Systems of non-zero field, such as Planet Finder and Submillimeter Probe of the Evolution of Cosmic Structure, could benefit. These systems most likely will contain large, flexible optormechanical structures subject to dynamic disturbance. Furthermore, large systems for high resolution imaging of planets or the sun from space may also benefit. Tactical and Strategic Defense systems will need to image very small targets as well and could benefit from the technology developed here. We discuss a novel speckle imaging technique with the potential to separate dynamic aberrations from static aberrations. Post-processing of a set of image data, using an algorithm based on this technique, should work for all but the lowest light levels and highest frequency dynamic environments. This technique may serve to reduce the complexity of the control system and provide for robust, fault-tolerant, reduced risk operation. For a given object, a short exposure image is ”frozen” on the focal plane in the presence of the environmental disturbance (turbulence, jitter, etc.). A key factor is that this imaging data exhibits frame-to-frame linear shift invariance. Therefore, although the Point Spread Function is varying from frame to frame, the source is fixed; and each short exposure contains object spectrum data out to the diffraction limit of the imaging system. This novel speckle imaging technique uses the Knox-Thompson method. The magnitude of the complex object spectrum is straightforward to determine by well-established approaches. The phase of the complex object spectrum is decomposed into two parts. One is a single-valued function determined by the divergence of the optical phase gradient. The other is a multi-valued function determined by, the circulation of the optical phase gradient-”hidden phase.” Finite difference equations are developed for the phase. The novelty of this approach is captured in the inclusion of this ”hidden phase.” This technique allows the diffraction-limited reconstruction of the object from the ensemble of short exposure frames while simultaneously estimating the phase as a function of time from a set of exposures. Author Aberration; Image Resolution; Imaging Techniques; Dynamic Control; Optical Control; Spaceborne Photography; Wave Fronts
20000063497 Kaiser Electro-Optics, Inc., West Carlsbad, CA USA Environmental Test Screening Procedure Zeidler, Janet, Kaiser Electro-Optics, Inc., USA; Mar. 30, 2000; 10p; In English Contract(s)/Grant(s): NAS8-98236; No Copyright; Avail: CASI; A02, Hardcopy; A01, Microfiche This procedure describes the methods to be used for environmental stress screening (ESS) of the Lightning Mapper Sensor (LMS) lens assembly. Unless otherwise specified, the procedures shall be completed in the order listed, prior to performance of the Acceptance Test Procedure (ATP). The first unit, S/N 001, will be subjected to the Qualification Vibration Levels, while the remainder will be tested at the Operational Level. Prior to ESS, all units will undergo Pre-ESS Functional Testing that includes measuring the on-axis and plus or minus 0.95 full field Modulation Transfer Function and Back Focal Length. Next, all units will undergo ESS testing, and then Acceptance testing per PR 460. Derived from text Environmental Tests; Stresses; Lightning; Mapping; Detection; Lenses 20000064062 NASA Goddard Space Flight Center, Greenbelt, MD USA Fracture Probability of MEMS Optical Devices for Space Flight Applications Fettig, Rainer K., Raytheon ITSS, USA; Kuhn, Jonathan L., NASA Goddard Space Flight Center, USA; Moseley, S. Harvey, NASA Goddard Space Flight Center, USA; Kutyrev, Alexander S., Raytheon ITSS, USA; Orloff, Jon, Maryland Univ., USA; Jul. 14, 1999; 6p; In English; No Copyright; Avail: CASI; A02, Hardcopy; A01, Microfiche A bending fracture test specimen design is presented for thin elements used in optical devices for space flight applications. The specimen design is insensitive to load position, avoids end effect complications, and can be used to measure strength of membranes less than 2 microns thick. The theoretical equations predicting stress at failure are presented, and a detailed finite element model is developed to validate the equations for this application. An experimental procedure using a focused ion beam machine is outlined, and results from preliminary tests of 1.9 microns thick single crystal silicon are presented. These tests are placed in the context of a methodology for the design and evaluation of mission critical devices comprised of large arrays of cells. Author Bending; Failure; Fracturing; Loads (Forces); Mathematical Models; Membranes; Performance Tests 20000064659 Washington State Univ., Dept. of Physics, Pullman, WA USA Polymer Processing for All-Optical Device Fabrication Final Report, 1 May 1996 - 31 Aug. 1999 Kuzyk, Mark G.; Mar. 21, 2000; 7p; In English Contract(s)/Grant(s): F49620-96-1-0188; AF Proj. 1651 Report No.(s): AD-A376188; 11F-2464-0265; AFRL-SR-BL-TR-00-2126; No Copyright; Avail: CASI; A01, Microfiche; A02, Hardcopy We have achieved our research goal to study the effect of polymer processing and composition on fabricability and performance of all-optical switching devices and optical amplifier devices. In the process, we have developed a deeper understanding of the linear and nonlinear properties of materials and how they affect device performance. The 6 major efforts completed in this program include: (1) interferometric measurements of the intensity dependent refractive index in single-mode polymer optical fibers that demonstrates switching, (2) loss, scattering, fluorescence and two photon absorption measurements based on a new transverse excitation technique that was invented in our lab, (3) refractive index profiling measurement techniques developed in our lab to characterized preforms and fibers, (4) third-order susceptibility studies aimed at understanding the nonlinearity mechanisms in dye-doped polymers, (5) demonstration of dual-core single-mode fiber with nonlinear coupling (switching), and (6) demonstration of fibers with electrodes. DTIC Fabrication; Optical Equipment; Light Amplifiers; Optical Switching 20000066586 Army Research Lab., Sensors Directorate, Adelphi, MD USA Observations and Calculations of Light Scattering from Clusters of Spheres Final Report, Dec. 1998-Jan. 1999 Holler, Stephen; Auger, Jean-Claude; Stout, Brian; Fan, Yongle; Bottiger, Jerold R.; Mar. 2000; 38p; In English; Prepared in cooperation with Yale Univ., New Haven, CT, New Mexico State Univ., Las Cruces, NM and Universite Pierre et Marie Curie, Paris, France. Contract(s)/Grant(s): Proj-B53A Report No.(s): AD-A377281; ARL-TR-2136; No Copyright; Avail: CASI; A03, Hardcopy; A01, Microfiche Two-dimensional angular optical scattering (TAOS) from clusters of polystyrene latex spheres is measured in the near-forward and near-backward directions. In both cases, the scattering pattern contains a rich and complicated structure due to the inter- 199
Page 1 and 2:
Scientific and Technical Aerospace
Page 3 and 4:
Introduction Scientific and Technic
Page 5 and 6:
Subject Divisions Table of Contents
Page 7 and 8:
ground equipment and systems. For a
Page 9 and 10:
Subject Categories of the Division
Page 11 and 12:
48 Oceanography 139 Includes the ph
Page 13 and 14:
72 Atomic and Molecular Physics 191
Page 15 and 16:
Document Availability Information T
Page 17 and 18:
Avail: NASA Public Document Rooms.
Page 19 and 20:
NASA CASI Price Tables — Effectiv
Page 21 and 22:
ALABAMA AUBURN UNIV. AT MONTGOMERY
Page 23 and 24:
��
Page 25 and 26:
20000061433 Pisa Univ., Dipartiment
Page 27 and 28:
English; 34th; 34th Thermophysics C
Page 29 and 30:
ciency of the generated derivative
Page 31 and 32:
20000063509 NASA Glenn Research Cen
Page 33 and 34:
05 AIRCRAFT DESIGN, TESTING AND PER
Page 35 and 36:
A long tradition of aerodynamic des
Page 37 and 38:
sonic and transonic cases will be p
Page 39 and 40:
20000061449 British Aerospace Publi
Page 41 and 42:
20000064593 NASA Langley Research C
Page 43 and 44:
performance required for a proposed
Page 45 and 46:
ment cost and create better product
Page 47 and 48:
tion (NPSS), is focused on the inte
Page 49 and 50:
surface measurement techniques used
Page 51 and 52:
with emphasis on the search for lin
Page 53 and 54:
20000063520 NASA Kennedy Space Cent
Page 55 and 56:
primary issues for it’s adaptatio
Page 57 and 58:
Footage shows the night vertical ta
Page 59 and 60:
20000067665 NASA Kennedy Space Cent
Page 61 and 62:
necessary for ignition modeling, or
Page 63 and 64:
engine lifetime, and high power ope
Page 65 and 66:
24 COMPOSITE MATERIALS ��
Page 67 and 68:
ments. For the screening of liner m
Page 69 and 70:
formation of a neutral, fluorescent
Page 71 and 72:
20000065655 Ames Lab., IA USA Funda
Page 73 and 74:
This is a second Triennial Conferen
Page 75 and 76:
of completely charged PSSNa solutio
Page 77 and 78:
20000064100 NASA Langley Research C
Page 79 and 80:
Spacecraft in low Earth orbit (LEO)
Page 81 and 82:
Pressure gradients, i.e. pressure h
Page 83 and 84:
agreed that the NO(sub x) levels co
Page 85 and 86:
tectural approach to extending the
Page 87 and 88:
20000064078 Physics and Electronics
Page 89 and 90:
20000064925 Institute for Human Fac
Page 91 and 92:
Page 93 and 94:
20000062455 National Inst. of Stand
Page 95 and 96:
Added Analysis (Risk Reduction); 6)
Page 97 and 98:
shipboard electrical power generati
Page 99 and 100:
20000067664 Jet Propulsion Lab., Ca
Page 101 and 102:
other, The theoretical framework go
Page 103 and 104:
figures compare the lift and pitchi
Page 105 and 106:
ment phase demonstrate desired feat
Page 107 and 108:
esolution mode with resolving power
Page 109 and 110:
to track 1% or 0.5% changes was hig
Page 111 and 112:
20000067643 NASA Marshall Space Fli
Page 113 and 114:
37 MECHANICAL ENGINEERING ��
Page 115 and 116:
solver based on overset grid techno
Page 117 and 118:
20000067659 NASA Marshall Space Fli
Page 119 and 120:
20000064621 Rensselaer Polytechnic
Page 121 and 122:
that for a specific example of a be
Page 123 and 124:
km x 1000 km). As with the nearly c
Page 125 and 126:
20000064527 Analytical Imaging and
Page 127 and 128:
20000064533 Austin State Univ., Dep
Page 129 and 130:
20000064539 California Univ., Inst.
Page 131 and 132:
Page 133 and 134:
in Yellowstone National Park. We ar
Page 135 and 136:
terns of community hysteresis based
Page 137 and 138:
Page 139 and 140:
tion model (DEM) fitting to the sca
Page 141 and 142:
The Carolina slate belt is a 10- to
Page 143 and 144:
20000063373 Los Alamos National Lab
Page 145 and 146:
20000064912 New Energy and Industri
Page 147 and 148:
and discusses the issues and resear
Page 149 and 150:
The objective of this study was to
Page 151 and 152:
distributions with engine test resu
Page 153 and 154:
7.6, while the 1926 events appear t
Page 155 and 156:
We investigate the compositional di
Page 157 and 158:
Flight Center, USA; Moore, T. E., N
Page 159 and 160:
This report presents the Applied Me
Page 161 and 162:
in Goa, India, by 3 - 4 days. Wind
Page 163 and 164:
51 LIFE SCIENCES (GENERAL) Includes
Page 165 and 166:
20000062717 Joint Inst. for Nuclear
Page 167 and 168:
Page 169 and 170: during 50% (SD 4%) of the breathing
Page 171 and 172: 20000064711 Massachusetts Inst. of
Page 173 and 174: The analysis of this smaller data s
Page 175 and 176: vided a functional helmet mount. Th
Page 177 and 178: 61 COMPUTER PROGRAMMING AND SOFTWAR
Page 179 and 180: The goal of multi-image classificat
Page 181 and 182: 20000063526 Defence Science and Tec
Page 183 and 184: 85 dB amplifier design evolved by o
Page 185 and 186: 20000064594 New Mexico Univ., Elect
Page 187 and 188: 20000064615 NASA Ames Research Cent
Page 189 and 190: declarations with a pattern recogni
Page 191 and 192: containing point where interpolatio
Page 193 and 194: has his own responsibility, while t
Page 195 and 196: the people, documents and projects
Page 197 and 198: and experimental technology, many o
Page 199 and 200: tems. In particular this applicatio
Page 201 and 202: Over the past decade, high performa
Page 203 and 204: expensive than a single analysis. I
Page 205 and 206: 20000064726 Carnegie-Mellon Univ.,
Page 207 and 208: 20000064099 Teledyne Brown Engineer
Page 209 and 210: 20000066597 Geophysical Observatory
Page 211 and 212: 20000065633 Institute TNO of Applie
Page 213 and 214: important conclusion is that for su
Page 215 and 216: est frame of the string. The modifi
Page 217 and 218: isotopes. The method and program we
Page 219: A detailed study is undertaken, usi
Page 223 and 224: delivers 60% of the x-ray flux from
Page 225 and 226: 76 SOLID-STATE PHYSICS ��
Page 227 and 228: 20000064660 Abdus Salam Internation
Page 229 and 230: 20000067648 NASA Marshall Space Fli
Page 231 and 232: 20000064703 Institute of Atomic Ene
Page 233 and 234: The BRST approach is applied to the
Page 235 and 236: 20000067671 Hampton Univ., VA USA A
Page 237 and 238: 82 DOCUMENTATION AND INFORMATION SC
Page 239 and 240: ecoming almost too cumbersome to be
Page 241 and 242: physical world. These are the two p
Page 243 and 244: with WFPC2 data. Tests of HSTphot
Page 245 and 246: A brief description is given of the
Page 247 and 248: 20000064070 NASA Ames Research Cent
Page 249 and 250: gas, show variations that have rema
Page 251 and 252: egy, called Power In that would all
Page 253 and 254: 20000065631 NASA Kennedy Space Cent
Page 255 and 256: 20000064089 Smithsonian Astrophysic
Page 257 and 258: A ABERRATION, 143, 198 ABRASION, 22
Page 259 and 260: COMPRESSIBLE FLOW, 83 COMPRESSION L
Page 261 and 262: FATIGUE (MATERIALS), 50, 93, 96 FAT
Page 263 and 264: LASING, 90 LATE STARS, 224 LATITUDE
Page 265 and 266: PATCH ANTENNAS, 74 PATHOLOGY, 98 PA
Page 267 and 268: SPACE PLATFORMS, 38 SPACE PROBES, 2
Page 269 and 270: WIND PROFILES, 137 WIND TUNNEL TEST
Page 271 and 272:
Brown, Andy, 38 Brown, April S., 20
Page 273 and 274:
Grosvenor, C. A., 70 Grosvenor, J.
Page 275 and 276:
Lu, Gui-Ying, 50 Lugg, Desmond J.,
Page 277 and 278:
Robertson, Tony, 39 Robinson, Jeffr
Page 279:
Warner, J. D., 63 Warren, James, 16
show all

Scientific and Technical Aerospace Reports Volume 38 July 28, 2000

Create successful ePaper yourself

Delete template?

Save as template?