| ARPA Solid State Laser and Nonlinear Materials Program |
JUN 94 |
233 pages |
| Authors:
Peter F. Moulton; SCHWARTZ ELECTRO-OPTICS INC CONCORD MA RESEARCH DIV
|
 | The Research Division of Schwartz Electro-Optics, as part of the ARPA Solid State Laser and Nonlinear Materials Program, conducted a three-year study "Erbium-Laser-Based Infrared Sources." The aim of the study was to improve the understanding of semiconductor-laser-pumped, infrared (IR) solid state lasers based on the trivalent rare-earth ion erbium (Er) doped into a variety of host crystals. The initial program plan emphasized operation of erbium-doped materials on the 2.8-3.0 micrometers ... |
|
| Optimization of Atmospheric Radiance Algorithms for Remote Sensing: Improvements in Minor Species Photochemical Code and Its Impact on IR Radiances |
24 MAY 1994 |
8 pages |
| Authors:
U. B. Makhlouf; UTAH STATE UNIV BEDFORD MA STEWART RADIANCE LAB
|
| The tasks of this work consisted of: (a) Upgrading the PL/GP diurnal photochemical code to include the Schumann-Runge continuum to produce the O(1D), and examine the role O(1D) plays in the CO2 4.3 microns radiance. (b) Improving the SHARC high altitude atmospheric generator especially around the terminator to produce very good agreement with the CIRRIS-1A measurements. |
|
| Snowmelt Forecasting. Further Cold Regions Development of Operational Hydrological Forecasting. Volume 2 |
MAR 94 |
94 pages |
| Authors:
K. M. Sambles; M. G. Anderson; BRISTOL UNIV (UNITED KINGDOM)
|
| This volume contains all the information that is required to operate the computer simulation model SNOMO. The input file required, the operational logic of SNOMO and the output produced by SNOMO are discussed in detail. A full listing of the SNOMO Fortran-77 code is included. |
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| SHARC, A Model for Calculating Atmospheric and Infrared Radiation Under Non-Equilibrium Conditions, |
24 JAN 1994 |
|
| Authors:
R. L. Sundberg; J. W. Duff; J. H. Gruninger; L. S. Bernstein; R. D. Sharma; PHILLIPS LAB HANSCOM AFB MA
|
 | A new computer model, SHARC, has been developed by the Air Force for calculating high-altitude atmospheric IR radiance and transmittance spectra with a resolution of better than 1 cm to the -1 power. Comprehensive coverage of the 2 to 40 micrometer (250 to 5000 cm to the -1 power) wavelength region is provided for arbitrary lines of sight in the 50-300 km altitude regime. SHARC accounts for the deviation from ... |
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| Method and Device for Improved IR Detection with Compensations for Individual Detector Response. |
04 JAN 1994 |
|
| Authors:
Kenneth C. Hepfer; S. R. Horman; Bob Horsch; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An advanced infrared (IR) Sensor based on the present invention would add the following two elements to a basic staring IR sensor using a 2 dimensional array of detector elements to significantly enhance the detection sensitivity of the device. The added features are: (1) Additional optics or modification to the normal optics to scan the image over a small fraction of the array dimensions so that each point in the ... |
|
| Laws of Infrared Similitude |
JAN 94 |
33 pages |
| Authors:
Peter O. Cervenka; Lou Massa; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
|
| Accurate physical scale models of complex systems are found to be great use in fields as diverse as aerodynamics, fluid mechanics, radar, or nuclear physics. It now appears that the concept of scale modeling may offer distinct advantages to those interested in the study of thermodynamic processes that occur in large physical structure. In this investigation, it is shown from a study of the heat equation and its boundary conditions ... |
|
| Four Years of Global Cirrus Cloud Statistics Using HIRS, Revised |
JAN 1994 |
58 pages |
| Authors:
Donald P. Wylie; W. P. Menzel; Harold M. Woolf; Kathleen I. Strabala; WISCONSIN UNIV-MADISON SPACE SCIENCE AND ENGINEERING CENTER
|
| Trends in global upper tropospheric transmissive cirrus cloud cover are beginning to emerge from a four year cloud climatology using NOAA polar orbiting HIRS multispectral infrared data. Cloud occurrence, height, and effective emissivity are determined with the CO2 slicing technique on the four years of data (June 1989 - May 1993). There is a global preponderance of transmissive high clouds, 42% on the average; about ... |
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| Analysis of Thermal Imagery Collected at Grayling 1, Grayling, Michigan |
JAN 1994 |
76 pages |
| Authors:
Salvador Rivera Jr; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS ENVIRONMENTAL LAB
|
| The purpose of the Smart Weapons Operability Enhancement (SWOE) Joint Test and Evaluation Program is to validate the SWOE synthetic scene generation procedure. Once validated, this procedure will hopefully change the design-test- redesign approach to smart weapons development, test, and evaluation. Using the SWOE process, smart weapons designers will be able to evaluate their sensor algorithms on simulated scenes with a greater degree of variability than is often presented during ... |
|
| Improved Gallium Nitride and Aluminum Nitride Electronic Materials |
94 |
98 pages |
| Authors:
W. D. Partlow; W. J. Choyke; R. P. Devaty; John T. Yates Jr.; K. H. Bornscheuer; WESTINGHOUSE SCIENCE AND TECHNOLOGY CENTER PITTSBURGH PA
|
| This report describes the results of a three year program to improve the quality of Group III nitride electronic materials. The effort was directed toward understanding and controlling surface-reactive chemical paths toward the growth of GaN. We demonstrated low temperature synthesis of GaN from trimethyl gallium and ammonia by two techniques: a two-step process using atomic hydrogen and electron beams, and a single step process using only an electron beam. ... |
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| Understanding Satellite Cirrus Cloud Climatologies with Calibrated LidarOptical Depths |
1994 |
40 pages |
| Authors:
Donald Wylie; Paivi Piironen; Walter Wolf; Edwin Eloranta; WISCONSIN UNIV-MADISON SPACE SCIENCE AND ENGINEERING CENTER
|
| Optical depth measurements of transmissive cirrus clouds were made using coincident lidar and satellite data to improve our interpretation of recent satellite cloud climatologies. These climatologies differ in the way they detect transmissive clouds because some use solar reflectance data (ISCCP) while other use multi-spectral infrared data (CO2 Slicing). To relate these climatologies and estimate the impact of transmissive clouds on the earth's heat budget, a ... |
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| Development and Evaluation of a Near Infrared Reflecting and Low Visibility Paint Scheme for RAAF P-3C Orion Aircraft |
OCT 93 |
|
| Authors:
L. V. Wake; MATERIALS RESEARCH LABS ASCOT VALE (AUSTRALIA)
|
| In this report, the development and trialling of a tactical, low visibility paint scheme (LVPS) for RAAF P-3C Orion aircraft is discussed. The LVPS was formulated in grey colours using solar heat reflecting pigments to reduce overheating problems which had resulted in the abandonment of an earlier camouflage trial. The paint scheme, which is one of several schemes under consideration by RAAF, employs strict countershading principles with pale grey underneath ... |
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| Airborne Studies of Ocean-Particle-Cloud-Interactions in the Arctic |
30 SEP 93 |
7 pages |
| Authors:
Peter V. Hobbs; UNIV OF WASHINGTON SEATTLE DEPT OF ATMOSPHERIC SCIENCES
|
| The specific tasks of this grant were to operate the University of Washington's Convair C-131A research aircraft in the arctic in support of LeadEx, to analyze data collected aboard the aircraft, and to provide theis data to other LeadEX investigators. the Convair C-131A made 18 flights totaling 70 hours over the ice pack north of Deadhorse, Alaska, in April 1992. Data was collected on: (1) Particles and gases in the ... |
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| Radiometric, Spectral and Effectiveness Equipment |
24 SEP 93 |
22 pages |
| Authors:
Bernard E. Douda; Henry A. Webster; NAVAL SURFACE WARFARE CENTER CRANE DIV IN
|
| This is a description of an assortment of Infrared Radiometric, Spectral and Effectiveness Equipment used for measurement of the radiative output and effectiveness of assorted devices. These instruments are installed and routinely operated at this center and on field flight test. The contents describe some of the instrument parameters and measurement capability. Pyrotechnics, Radiometry, Spectroradiometry and Effectiveness. |
|
| Far Ultraviolet Images of the Nightime Ionosphere |
23 SEP 93 |
66 pages |
| Authors:
Thomas P. Hekman; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Naval Research Laboratory's Far Ultraviolet Cameras Experiment is part of an ongoing project to develop a means for real time space based monitoring of the upper atmosphere. The purpose of this paper is to develop a method by which useable data can be extracted from the images obtained from the cameras. The required output is an intensity profile of the light in the band of the camera as a ... |
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| Work Plan for the Marine Aerosol Properties and Thermal Imager Performance Trial (MAPTIP) |
SEP 93 |
112 pages |
| Authors:
D. R. Jensen; G. de Leeuw; A. M. van Ejik; NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA
|
| Atmospheric aerosol and infrared sea and terrain background models are of special importance for the assessment of the performance of electro- optical (EO) systems. The degradation of the radiance contrast between a target and its natural background, as viewed by an infrared sensor, is determined by the constituents of the intervening atmosphere that absorb and scatter the radiation. The assessment, therefore, depends upon the accuracy of the atmospheric models being ... |
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| Mirror Velocity Sampling Errors in a Michelson Interferometer |
SEP 93 |
43 pages |
| Authors:
R. J. Combs; R. B. Knapp; P. E. Field; EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD
|
| Mirror velocity variations in a continuous mirror drive Michelson interferometer result in erroneous interferogram sampling. The effects of systematic and random mirror fluctuations are evaluated. Four methods of evaluation provide a means to quantify the importance of mirror velocity errors in the Fourier spectrometer's performance as a spectroradiometer. The four methods are time interval signal analysis, sine wave test, optical chopper modulation, and examination of consecutive interferograms. Examination of consecutive ... |
|
| Designs for a 10.6 micrometer Electromagnetic Wiggler Free-Electron Laser (FEL) |
30 AUG 93 |
32 pages |
| Authors:
Arne W. Fliflet; Wallace M. Manheimer; NAVAL RESEARCH LAB WASHINGTON DC
|
| The possibility of developing gyrotron-powered electromagnetic wiggler free-electron laser (FEL) oscillators is of considerable interest for reducing the electron energy required for operation in the infrared spectrum. This memorandum considers the design of a 10.6 microns electromagnetic wiggler FEL experiment based on the University of California at Santa Barbara (UCSB) 6 MeV electrostatic accelerator. Both waveguide and quasioptical wiggler resonator configurations are considered. A prescription for optimizing the gain of ... |
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| SHARC-3 Calculations of Atmospheric IR Radiance in the Solar Terminator Region |
02 JUL 93 |
23 pages |
| Authors:
S. M. Adler-Golden; M. W. Matthew; SPECTRAL SCIENCES INC BURLINGTON MA
|
| The Air Force SHARC-3 Atmospheric IR radiance code has been used to simulate CO2, O3, and OH limb radiances observed in the solar terminator region during the 1977 SPIRE and 1991 CIRRIS-1A experiments. These calculations represent the first direct comparisons with field data using the new multiple- profiles and multiple-atmospheres features in SHARC-3. The good agreement between the SHARC-3 predictions and the data provide substantial validation of the kinetic and ... |
|
| Ultrafast Processes in Tunneling Microstructure Devices |
21 JUN 93 |
5 pages |
| Authors:
R. R. Alfano; Kai Shum; CITY COLL NEW YORK
|
| A systematic investigation of ultrafast electron tunneling processes in semiconductor microstructures in presence of inter-valley (X-gamma) scattering, infrared radiation, phonons, and Coulomb interaction has been undertaken. Various important time constants involved in high speed electronic and photonic device operation were obtained such as the lifetime of a quasi- bound state, the time needed for in electron to tunnel into a well through a barrier, and the escape time for an ... |
|
| Infrared Transmission and Path Radiance through Dust and Fog |
APR 93 |
31 pages |
| Authors:
James Williams; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The obscurant effects of dust and fog can significantly degrade the performance of infrared (IR) sensors engaged in target acquisition. To quantify these effects, computer runs were conducted using the EOSAEL model FCLOUD for the 3 - to 5-micrometers and 8 - to 12-micrometers wavebands. FCLOUD was used to calculate beam transmission and path radiance through homogeneous ellipsoidal dust and fog clouds. Both advective and radiation fogs were considered. The ... |
|
| Halocarbons as Halon Replacements. Volume 4. Laboratory Testing of Halon 1301 Replacements. Phase 2 |
MAR 93 |
92 pages |
| Authors:
Douglas S. Dierdorf; Robert E. Tapscott; Stephanie R. Skaggs; Ted A. Moore; NEW MEXICO ENGINEERING RESEARCH INST ALBUQUERQUE
|
| As a result of stratospheric ozone depletion and greenhouse warming concerns, the present halon fire-extinguishing agents will be phased out by 1 January 1994 under an international treaty. The U.S. Air Force has placed a high priority on the development of substitute agents to replace halon fire suppressants. This report describes the laboratory-scale experimental work performed on the Halon 1301 replacement agents. The 5/8-scale NMERI cup burner was used extensively ... |
|
| Introduction to Lead Salt Infrared Detectors |
FEB 93 |
26 pages |
| Authors:
David A. Kondas; EAGLE-PICHER INDUSTRIES INC COLORADO SPRINGS CO COUPLES DEPT
|
| This technical report establishes the background necessary to understand how lead sulfide (PbS) and lead selenide (PbSe) infrared detectors operate. Both detectors, which are members of the lead salt family of infrared detectors, use the photoconductive effect to detect energy residing within the infrared region of the electromagnetic spectrum. PbS detectors are useful for detecting energies in the 1 to 3 micrometer region, while PbSe detectors can detect energies in ... |
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| Airborne Studies of OCean-Particle-Cloud Interactions |
04 JAN 93 |
6 pages |
| Authors:
UNIV OF WASHINGTON SEATTLE DEPT OF ATMOSPHERIC SCIENCES
|
| Our objectives were to measure the lead signatures by remote sensing, measure emissions and fluxes from leads, determine effects of lead emissions of clouds, and to characterize arctic haze. Our approach was to fly over the pack ice, north of Deadhorse Alaska, detect leads with open water and conduct in situ measurements, sampling and remote sensing measurements. The measurements included determining the concentrations of droplets, ice crystals, and cloud condensation ... |
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| CBSD: The Celestial Background Scene Descriptor. |
JAN 1993 |
|
| Authors:
J. P. Kennealy; P. V. Noah; E. F. Tedesco; R. M. Cutri; S. F. Dermott; MISSION RESEARCH CORP NASHUA NH
|
| This report documents the Celestial Background Scene Descriptor (CBSD) program which is a suite of models to simulate the radiance of astronomical sources. The models simulate the contribution of the celestial background in the wavelength regime 2 to 30 micrometers with a positional accuray of 2 arcseconds. The output of the models are tables and images suitable for use in sensor simulation. The CBAMP model calculates the thermal radiance and ... |
|
| CBSD: The Celestial Background Scene Descriptor |
JAN 93 |
257 pages |
| Authors:
J. P. Kennealy; P. V. Noah; E. F. Tedesco; R. M. Cutri; S. F. Dermott; MISSION RESEARCH CORP NASHUA NH
|
| This report documents the Celestial Background Scene Descriptor (CBSD) program which is a suite of models to simulate the radiance of astronomical sources. The model simulate the contribution of the celestial background in the wavelength regime 2 to 30 micrometers with a positional accuracy of 2 arcseconds. The output of the models are tables and images suitable for use in sensor simulation. The CBAMP model calculates the thermal radiance and ... |
|
| The Determination of Radiosonde Geopotential Height Biases by the Navy's Gobal Data Assimilation System |
JAN 1993 |
7 pages |
| Authors:
Nancy L. Baker; Richard Franke; Toke Jayachandran; NAVAL RESEARCH LAB MONTEREY CA
|
| Recently, considerable attention has been given to systematic errors occurring in the global radiosonde network. Many operational forecasting centers are involved in global radiosonde network. Many operational forecasting centers are involved in global data monitoring efforts using a short-range forecast from a global forecast model as the comparison tool (Baker 1991,1992; ECMWF 1988, 1989; Hall 1992; Hollingworth et al. 1986). The WMO International Radiosonde Intercomparison Tests (Nash and Schmidlin 1987) ... |
|
| Evaluation of Processing Methods for a Calcia-Yttria-Alumina-Silica Glass-Ceramic. |
1993 |
|
| Authors:
V. Saraswati; S. Raoot; K. V. S. R. Anjaneyulu; N. V. Visveswararao; DEFENCE METALLURGICAL RESEARCH LAB HYDERABAD (INDIA)
|
| A glass-ceramic in the calcia-yttria-alumina-silica system was prepared through the melt, sinter, sol-gel and solution routes. The development of a calcium yttrium silicate phase was found to depend significantly on the method of processing the glass. This is attributed to the strong influence of the surface/interface on reactivity. X-ray diffraction and Fourier transform infrared techniques were used for identification. The processing methods were also evaluated and compared for product quality ... |
|
| Summer Research Program (1992). High School Apprenticeship Program (HSAP) Reports. Volume 13. Phillips Laboratory |
28 DEC 92 |
295 pages |
| Authors:
Gary Moore; RESEARCH AND DEVELOPMENT LABS CULVER CITY CA
|
| The following reports were among those completed during the Air Force 1992 Apprenticeship Program: The Development of Multi-Dimensional Fourier Transform to Be Used to Predict the Light Scattering Off an Optic; Programming Bar Code Readers for Inventory Purposes using the Interactive Reader Language; High Resolution Statistical Models for Prediction of Cloud Cover; Exploring Electromagnetic Effects; Fuzzy-C Optical Tracker; Thermal Control Using Scrapers in a Rotating-Disk, Wetted-Wall Chemical Reactor. |
|
| Enhanced Photorefractive Effects in Barium Titanate |
DEC 92 |
51 pages |
| Authors:
George A. Brost; ROME LAB GRIFFISS AFB NY
|
| This report documents investigations of characteristics of secondary centers (shallow traps) in BaTiO3, and the possible utilization of these traps for enhanced photorefractive effects at infrared wavelengths. Secondary centers were characterized by photo-induced absorption and two-beam coupling experiments. Two species were identified, with concentrations of approximately 1.5 x 10(exp 17) cm(-3) and 2 x 10(exp 16) cm(-3). The effect of secondary centers on the sublinear intensity dependence and temperature dependent ... |
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| Nondestructive Evaluation of Composites Using Infrared Imaging |
NOV 92 |
18 pages |
| Authors:
Mark E. Todaro; Mark A. Doxbeck; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| Benet Laboratories is pursuing methods for nondestructively evaluating composite materials and structures associated with large caliber gun tubes, including items already being manufactured, such as the bore evacuator, as well as experimental items, such as the thermal shroud and composite- reinforced gun tubes. Typical needs include identifying delaminations between the composite and a substrate, delaminations between composite layers, damage from later manufacturing processes, and impact damage during use. Recent in- ... |
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| Nondestructive Evaluation of Electrodeposited Chromium |
NOV 92 |
16 pages |
| Authors:
Mark E. Todaro; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
|
| Benet Laboratories is pursuing methods for nondestructively evaluating the quality and adhesion of electrodeposited chromium coatings on the bore of large caliber gun tubes. The Army currently has no suitable means for testing such coatings nondestructively. A poor quality or poorly adherent coating shows up only when several test rounds are fired through the tube, removing portions of the coating and exposing the steel underneath. Recent in- house work has ... |
|
| Measurement of Optical Properties of Infrared Bandgap Superlattices |
OCT 92 |
17 pages |
| Authors:
Donald F. Nelson; WORCESTER POLYTECHNIC INST MA
|
| The lattice-matched bandgap-tunable heterostructure system GaxIn1-x AsyP1-y/InP is technologically important because the bandgap can be tuned with composition between 1.55 and 0.90 um wavelengths. Because the range of bandgaps in this heterostructure system is further into the infrared when compared to the much studied GaAs/GaxAl1-x As system, many spectroscopic techniques are more difficult. For example, prior to this study no inelastic light scattering had been done in this heterostructure system ... |
|
| Broadband Near IR Laser Hazard Filters |
10 SEP 92 |
|
| Authors:
Gajendra Savant; PHYSICAL OPTICS CORP TORRANCE CA
|
| Ocular protection against laser radiation and ballistic fragments is required for military aviators and ground personnel. Protection against laser radiation in several laser hazard and threat wavelength regions is required to prevent ocular injury from existing potentially hazardous systems. The laser hazard and threat wavelengths extend from the ultraviolet through the near infrared. There is potential for a cost effective protection against fixed wavelength threats utilizing narrow-band holographic reflection filters ... |
|
| Definition of the Sea Surface Infrared Sun Glitter Corridor |
SEP 92 |
154 pages |
| Authors:
Eric B. Moss; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Measurements of sea surface radiance were made in the 2-5.6 and 8-14 micrometers wavebands within patterns of intense specular highlights formed near the azimuth of the sun at low solar observation angles. From these measurements, an analysis of the statistical and physical nature of a sun glitter channel as presented to a low altitude observer (i.e. shipboard) was conducted. Findings showed strong correlations between wind speed and corridor width, and ... |
|
| Measurement of a Michelson Interferometer Mirror Velocity With a Time Interval Analyzer |
JUL 92 |
46 pages |
| Authors:
R. J. Combs; R. B. Knapp; C. T. Cathey; CHEMICAL RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUND MD
|
| This report documents the design, construction, and implementation of a time interval analyzer (TIA). The TIA is a precision counter that measures the dynamic variation in the time intervals (i.e., frequency) of a signal. The helium-neon (HeNe) laser signal from the servo mirror control circuitry of the interferometer provides a nearly constant frequency source. The HeNe signal frequency is directly proportional to the interferometer mirror velocity. A constant velocity is ... |
|
| Data Analysis for Bark and Leaf Reflectance Measurements |
JUN 92 |
54 pages |
| Authors:
J. H. Gruninger; D. C. Robertson; M. M. Pervaiz; SPECTRAL SCIENCES INC BURLINGTON MA
|
| This study addresses the incorporation of the effects associated with natural environments and backgrounds in the simulation models which are essential to the development of smart weapons. The effects of leaves and bark in the visible and IR spectral regions is discussed and a computational model is presented for the bi-directional reflectance (BRDF) measurement carried out. A singular value decomposition (SVD) technique is used to justify an important model assumption, ... |
|
| Analysis of the IBSS Spectra of Space Shuttle Control Engine Exhaust |
31 MAY 92 |
30 pages |
| Authors:
David L. Rall; Irving L. Kofsky; PHOTOMETRICS INC WOBURN MA
|
| Infrared Background Signature Survey spectra of exhaust gases from attitude controlling liquid-bipropellant thrusters, taken from onboard space shuttle on mission STS-39 in connection with the Orbiter Environment Experiment, are analyzed. The high-resolution multichannel sensor viewed both the expanding combustion products near the engine and through the volume where these high kinetic energy molecules react with atmospheric species. Its segments of data over about half the spectrum range between 2.5 and ... |
|
| Modeling of Atom-Diatom Scattering |
30 MAY 92 |
46 pages |
| Authors:
J. M. Sindoni; YAP ANALYTICS INC LEXINGTON MA
|
| This report entails the work performed on modeling atom-diatom scattering processes utilizing the Impulse Approach (IA). Results of the model, obtained with a computer code, have proven to be in remarkable agreement with laboratory measurements for several atom-diatom scattering systems. Two scattering systems, in particular, that were successfully modeled and compared to measurements were Ar-KBr and Ar-CsF. The IA model provided an explanation for the rapid deactivation evident in the ... |
|
| Terahertz Absorption between Split Subbands in Coupled Quantum Wells, |
22 MAY 1992 |
|
| Authors:
Hartmut Roskos; Martin C. Nuss; Jagdeep Shan; Ben Tell; Jack Cunningham; AT AND T BELL LABS HOLMDEL NJ
|
| The transition between split subbands (design splitting: 5 meV) in n-doped coupled quantum wells is investigated by time-domain spectroscopy with ultrafast pulses of far-infrared radiation. This very strong transition has a linewidth of 2.5 meV. The maximum absorption is observed at 4.2 meV photon energy, lower than the design splitting. We attribute this down-shift of the peak absorption tentatively to the influence of many-body interactions which lead to correction terms ... |
|
| Advances in Fibre-Optic Technology in Communications and for Guidance and Control (Techniques de Pointe en Matiere de Fibres Optiques dans le Domaine des Communications et pour le Guidage et le Pilotage) |
MAY 92 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| Fibre-optics is progressively changing from the research stage to the field of application. However, new possibilities are emerging, which will probably bring a new revolution in the field of telecommunications, such as coherent transmission, new transmission material transparent to mid-infrared radiation, active fibres and soliton propagation. Fibre-optics is gaining increasing importance in tactical missile and aircraft guidance and control. This has been driven by the commercial development of fibre optic ... |
|
| Dynamic Properties of Contra-Directional Second-Harmonic Generation in Periodically Nonlinearity-Modulated Structures, |
APR 1992 |
|
| Authors:
Masayuki Matsumoto; Kohsuke Tanaka; OSAKA UNIV (JAPAN)
|
| Quasi-phase-matched (QPM) second-harmonic generation (SHG) in periodically domain-inverted ferroelectric waveguides has been extensively studied in recent years for use in efficient frequency doubling of infrared radiation emitted from laser diodes. The period of the domain inversion is usually chosen to be A = mA/(2 (n1-n2), where A is the fundamental wavelength, m is the order of QPM, and n, and n2 are the effective indices of fundamental and second-harmonic waves, ... |
|
| Remote Sounding of Temperature in Cloudy Atmospheres Using the Differential Inversion Method |
28 FEB 92 |
68 pages |
| Authors:
S. C. Ou; K. N. Liou; UTAH UNIV SALT LAKE CITY CENTER FOR ATMOSPHERIC AND REMOTE SOUNDING STUDIES
|
| We have assessed the applicability of the Differential Inversion (DI) method to temperature retrievals in both clear and cloudy atmospheres using real satellite data. The main theme of the DI is that the local Planck intensity can be exactly expressed by a linear combination of the derivatives of radiances in the logarithmic pressure coordinate. The satellite data set used in this work contains collocated brightness temperatures and radiosonde data which ... |
|
| Proceedings of the Annual Review Conference on Atmospheric Transmission Models (14th) Held at Hanscom Air Force Base, Massachusetts on 11-12 June 1991 |
26 FEB 92 |
497 pages |
| Authors:
L. W. Abreu; F. X. Kneizys; PHILLIPS LAB HANSCOM AFB MA
|
| Viewgraphs and other materials for the 42 papers presented at the Fourteenth Annual Review Conference on Atmospheric Transmission Models held at the Geophysics Laboratory (AFSC) are included. Materials are included from each of the four sessions: Session on Aerosols and Clouds; Session on Atmospheric Propagation Models; Session on Measurements and Models; and Topical Session on Spectral Line Shapes. Contributed papers and an appendix are also included. |
|
| Development of Ultra-Low Noise, High Sensitivity Planar Metal Grating Coupled AlGaAs/GaAs Multiquantum Well IR Detectors for Focal Plane Array Staring IR Sensor Systems |
01 FEB 92 |
31 pages |
| Authors:
Max N. Yoder; FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL ENGINEERING
|
| During this reporting period (11-01-91 to 1-31-92), we have continued the study of the performance characteristics of the metal grating coupled bound- to-miniband (BTM) and step-bound-to-miniband (SBTM) transition multiquantum well(MQW)/superlattice (SL) barrier infrared (IR) detectors formed on the GaAs and InP substrates for 8-12 micrometer focal plane arrays and image sensor applications. Specific tasks performed included: (1) designed and grown several (BTM) GaAs- and (SBTM) InGaAs-based QWIP (quantum well infrared ... |
|
| Remote Sensing of the Propagation Environment (La Teledetection du Milieu de Propagation) |
FEB 92 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| Increasing complexity and sophistication of modern military sensor and weapon systems require a more accurate and timely description of the propagation environment for the entire electromagnetic spectrum (from extremely low frequencies through the ultraviolet band). Active and passive remote sensing techniques deployed from the ground, from airborne platforms and, very importantly, from satellites offer the greatest potential for producing the desired information in a timely manner. The NATO Symposium addressed ... |
|
| Chemistry of Organoindium Hydrides. The Synthesis, Characterization and Crystal Structure of K(H(In(CH2CMe3)3)2) |
21 JAN 92 |
26 pages |
| Authors:
O. T. Beachley Jr.; Sun-Hua Chao; Melvyn R. Churchill; Ronald F. See; STATE UNIV OF NEW YORK AT BUFFALO DEPT OF CHEMISTRY
|
| Two new organoindium hydrides have been prepared and fully characterized according to their physical properties, partial elemental analyses, molecular weight studies and IR and 1H and 13C NMR spectral studies. The unique hydrogen atoms bonded to indium in the two compounds provide characteristic infrared bands and 1H NMR resonances which have been identified by comparative studies with the corresponding deuterium derivatives. Compounds which contain indium hydrogen bonds are difficult to ... |
|
| Defects in Semiconductors 16: Proceedings of the International Conference (16th) Held in Bethlehem, Pennsylvania on 22-26 July 1991. Part 1 |
JAN 92 |
|
| Authors:
Gordon Davies; Gary G. DeLeo; Michael Stavola; LEHIGH UNIV BETHLEHEM PA
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| Partial contents of Part 1 of this symposium include: (1) Microstructure of hydrogen and dopants in hydrogenated amorphous Si; (2) Diffusion and drift of hydrogen in silicon and gallium arsenides; (3) Hydrogen- induced platelets in silicon: separation of nucleation and growth; (4) Hydrogen effusion from doped monocrystalline B-doped silicon; (5) Effect of multiple trapping on hydrogen diffusion in Si; (6) Measurements of the diffusion coefficient of hydrogen in silicon monitored ... |
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| Calibration of an AEDC Low-Temperature Blackbody Standard at NIST |
JAN 92 |
24 pages |
| Authors:
K. B. Jarratt; ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN
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| Sensors and their focal planes that are responsive to long-wavelength infrared (LWIR) energy and operate in a low-pressure environment require calibration. Calibration is normally accomplished in a vacuum chamber having an optically tight, cryogenically cooled liner. A blackbody source or attenuated blackbody source is used in the chamber to provide a known level of LWIR energy to the sensor or focal plane. Prior to the test, these blackbodies must also ... |
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| Midwest Free-Electron Laser Program |
17 DEC 91 |
11 pages |
| Authors:
L. J. Cerullo; M. Epstein; M. E. Marhic; W. Z. Rymer; K. G. Spears; MIDWEST BIO-LASER INST CHICAGO IL
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| It has been shown that pulsed Nd:YAG irradiation of nervous tissue in both mammalian and frog preparations produces selective damage to conduction and axoplasmic transport in small caliber sensory afferent fibers, which may be those responsible for pain sensation. In addition, the thermal affects on peripheral nerve appear to be primarily on sodium channels. This preferential sodium effect can be enhanced or developed further for clinical use to provide novel ... |
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| Solid Fuel Ramjet Infrared Signature |
DEC 91 |
76 pages |
| Authors:
Russell P. Luehrsen; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The objective of the thesis was to determine the effects of equivalence ratio and fuel composition on the infrared signature of solid fueled ramjets (SFRJ). Solid fuels investigated were Plexiglas, HTPB, and HTPB with aluminum, silicon, boron carbide, and or magnesium. They were tested at chamber pressures of 80-170 psia and with equivalence ratios between 0.3 and 1.4 With the plume emissivity set to 1.0, plume irradiance was found to ... |
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Reports by Keyword(s)
INFRARED RADIATION
