| Microdischarge Devices and Arrays |
JAN 2005 |
24 pages |
| Authors:
J. G. Eden; ILLINOIS UNIV CHAMPAIGN GRANTS AND CONTRACTS ADMINISTRATION
|
 | During this grant, several major advances have been made in the technology of this new family of photonic devices. Highlights include: 1. The discovery that microdischarge devices with Si pyramid cathodes are extraordinarily sensitive photo detectors in the near-IR and visible. This new hybrid semiconductor/plasma device was found to have a photoresponsivity at least an order of magnitude greater than that of commercially-available avalanche photodiodes and two orders of magnitude ... |
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| Thermography for the Characterization of Corrosion Damage |
2000 |
36 pages |
| Authors:
Ignacio Perez; Paul Kulowitch; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| Thermography is a viable NDE technique for the characterization of corrosion in metallic materials. Thermography is a rapid, noncontact, wide area inspection technique that is easy to interpret and that is not significantly sensitive to material curvature. We have developed a portable system and have characterized the sensitivity of the technique. Results will be presented in this paper. |
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| Spatially Resolved Combustion Species and Temperatures of Solid Propellant Flames Using Snapshot Spectroscopy |
OCT 1999 |
32 pages |
| Authors:
Barrie E. Homan; John A. Vanderhoff; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Experimental improvements have been made in the ultraviolet (UV)- visible absorption spectroscopy technique applied to propellant flame diagnostics. The two-dimensional (2-D) feature of an intensified charge-coupled device (ICCD) detector was used to simultaneously record multiple, spatially distinct absorption spectra over a region of 0.35 cm. Temporal resolution has been increased to 1 ms by pulsing a simmering xenon arc lamp. The resulting increase ... |
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| Measurements of the Ultraviolet Fluorescence Cross Sections and Spectra of Bacillus Anthracis Simulants |
MAY 1999 |
48 pages |
| Authors:
John R. Stephens; LOS ALAMOS NATIONAL LAB NM
|
| Measurements of the ultraviolet autofluorescence spectra and absolutecross sections of the Bacillus anthracis (Ba) simulants Bacillus globigii (Bg), Bacillus megaterium (Bm), Bacillus subtilis (Bs), and Bacillus cereus (Bc) were measured. Fluorescence spectra and cross sections of pine pollen (Pins echinata)were measured for comparison. Both dried vegetative cells and spores separated from the sporulated vegetative material were studied. The spectra were obtained by suspending a small number (<10) of particles in ... |
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| Tri-Service Thermal Radiation Test Facility Xenon Flashlamp Operators Manual |
01 JUN 1997 |
66 pages |
| Authors:
Michael Sweeney; DAYTON UNIV OH RESEARCH INST
|
| Safe operating and servicing test procedures for the Flashlamp Thermal Simulator, the Flashlamp Thermal Simulator Voltage Monitor, and the Vortek Stabilized Arc Lamp are described in this document. The manual guides test technicians operating a Bentley 28618 microcomputer through proper safety and operational procedures while operating the Flashlamp Thermal Simulator and the Vortek Stabilized Arc Lamp. A (pre and post) safety checklist to be followed during equipment utilization is provided. ... |
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| Signal Lamp Development for Minor Aids to Navigation |
JUN 96 |
354 pages |
| Authors:
Joseph P. Sargent Jr; COAST GUARD RESEARCH AND DEVELOPMENT CENTER GROTON CT
|
| This report documents the research and development effort conducted to find an alternative light source to the standard tungsten filament incandescent lamp used on most minor aids to navigation. The goal was a lamp that directly emitted the required color light, with reduced maintenance, and improved reliability. The study evaluated a number of arc lamp technologies including: metal vapor, cold and heated salts, amalgams, and mercury pool lamps. While the ... |
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| Modeling Light Valve Replacements in a Training Unit: The Spare Demand Process |
MAR 96 |
56 pages |
| Authors:
Michael A. Hollister; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis utilizes data on the time to failure of individual light valves to represent the random process of all failures at a many-valve training unit. This process governs the demand for replacement spares. The light valve replacement model, with finite spares, is based on theoretical results concerning the Poisson tendency for a superposition of renewal processes. Graphical analysis and a simulation verify that the theory can apply under practical ... |
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| Design of a More Accurate, Higher Fidelity, Dual-Source Air Mass Zero Solar Simulator |
15 JAN 95 |
14 pages |
| Authors:
L. C. Kilmer; AEROSPACE CORP EL SEGUNDO CA TECHNOLOGY OPERATIONS
|
| A dual-source solar simulator has been designed that provides a more accurate, higher fidelity spectral match to the Air Mass Zero (AMO) solar spectrum in comparison to presently available conventional and state-of-the-art solar simulators. The dual-source solar simulator design combines the ultraviolet (Uv) light from a xenon arc lamp and the visible and infrared (IR) light from a tungsten lamp using standard wide-band hot and cold mirrors. However, additional filtering ... |
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| Development of Advanced Thermal ana Electric Propulsion (TEP) System |
25 NOV 94 |
50 pages |
| Authors:
Bagher M. Tabibi; HAMPTON UNIV VA DEPT OF PHYSICS
|
| On September 30, 1993, the Department of Physics at Hampton University was awarded a research instrumentation grant by the AFOSR for the development of an advanced Thermal and Electric Propulsion (TEP) system. Under this grant, a TEP test facility capable of providing 60-kW optical power for thermal propulsion and 30-kW electric power for the magnetoplasmadynamic (MPD) thruster has been constructed and installed. The TEP is literally of thermal and electric ... |
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| High-Power CW Diode-Laser-Array-Pumped Solid-State Lasers and Efficient Nonlinear Optical Frequency |
03 JAN 94 |
9 pages |
| Authors:
Robert J. Shine; Robert L. Byer; STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
|
| During the interim period of this bridging contract, we have continued to work on the development of high-power cw diode-laser-array-pumped solid-state lasers. Towards that end, we have built lower power lasers in order to test individual components needed for the high-power laser, specifically we have built a 1 watt ring laser and a 5 watt slab laser. The 1 watt laser was used to study the injection locking process while ... |
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| Evaluation of Present and Potential Performance of Flow Cytometry |
94 |
8 pages |
| Authors:
Harald B. Steen; NORWEGIAN RADIUM HOSPITAL OSLO INST FOR CANCER RESEARCH
|
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| Miniature Color Display Phase 4 |
MAY 93 |
41 pages |
| Authors:
Henry Franklin; HONEYWELL SYSTEMS AND RESEARCH CENTER PHOENIX AZ
|
| A 400 x 300-pixel miniature color display with a resolution of 300 pixels/inch, yielding a 1.3 x 1.0-inch active area, has been demonstrated for helmet-mount applications. The display uses active-matrix subtractive-crystal technology. This approach produces high luminance and full color at each pixel without the loss in addressable resolution that is associated with conventional additive-color displays. A stack of three active-matrix twisted-nematic liquid- crystal light valves, sandwiching cyan, magenta, and ... |
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| High Ambient Temperature Heat Flux Calibration System |
11 FEB 93 |
69 pages |
| Authors:
VATELL CORP CHRISTIANSBURG VA
|
| In this contract Vatell Corporation explored source and temperature control concepts for high ambient temperature heat flux calibration. Three alternative calibration methods were studied: (1) concentrated high intensity light radiation, (2) heated graphite block radiation and (3) convection. Neither the graphite block method nor the convection method could match the temperature and heat flux range of the concentrated high intensity light method, which was selected for development of a preliminary ... |
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| Luminance, Contrast and Polarization of White Light Reflected from Ground Combat Vehicles |
JUN 92 |
331 pages |
| Authors:
Roy M. Matchko; Grant R. Gerhart; TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| This document presents the results of a comprehensive study for the luminance and polarization characteristics of three selected combat vehicles. The objective was to measure and analyze bi-directional reflectance data for the M60 tank, the Marine Corps amphibious Light Armored Vehicle (LAV25), the Ml tank and various background scenes. The goal was to understand the passive, visual signatures of these vehicles in terms of phenomenological parameters such as angles of ... |
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| Absorption Spectroscopy through the Dark Zone of Solid Propellant Flames |
APR 92 |
48 pages |
| Authors:
John A. Vanderhoff; M. W. Teague; Anthony J. Kotlar; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A windowed strand burner with a propellant feed mechanism has been used to characterize the steady-state combustion of solid propellants over a pressure environment of 0.1-2.0 MPa nitrogen. Under conditions where a line of sight measurement is meaningful, temperatures and absolute concentrations can be extracted from optical absorption spectra An arc lamp light source and spectrometer-intensified photiode array detector systems provided the means to absorption spectra for NO through the ... |
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| High Definition Video-Rate Laser-Addressed Liquid-Crystal Light-Valve Projection Display. |
12 FEB 1991 |
|
| Authors:
John A. Trias; DEPARTMENT OF THE NAVY WASHINGTON DC
|
 | A high definition, video-rate laser-addressed liquid-crystal light-valve projection display provides for real-time applications to large-area projection displays. A laser raster scanner uses acousto-optic components to modulate and deflect the laser beam. An acoustic optical, acoustic traveling wave lens is included to increase the optical resolution of the scanner system. A liquid-crystal light-valve spatially is modulated by a high resolution coherent beam to responsibly modulate a high intensity light coming from ... |
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| Solid State Photochemical Generation of Triplet Phenoxy-Phenoxy Radical Pairs |
01 APR 90 |
8 pages |
| Authors:
P. M. Lahti; D. A. Modarelli; MASSACHUSETTS UNIV AMHERST DEPT OF CHEMISTRY
|
| Use of bis-aryloxalate neat solid samples to investigate ferromagnetic phenoxy-phenoxy geminate geminate coupling is described. The title compounds (described in Technical Report 16) form good crystals, which up cooling to 77K or below and irradiation with a Xenon arc lamp give ESR spectra indicating both monoradical signals and radical-radical triplet pair interactions. The size of the interaction may be qualitatively determined by the spectral extent of the triplet spectrum (80-120 ... |
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| Temperature and OH Concentrations in a Solid Propellant Flame Using Absorption Techniques |
APR 90 |
30 pages |
| Authors:
John A. Vanderhoff; Anthony J. Kotlar; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Rotationally resolved absorption spectroscopy in the A-X (0,0) vibrational band system of OH around 306.4 nm has been performed to determine the temperature and OH concentration in solid propellant flames. OH is sufficiently well characterized that the spectra can be least squares fitted under a variety of conditions. These conditions include the peculiarities of the experimental setup, instrument response parameters and absorption baseline, as well as the temperature and OH ... |
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| Liquid Crystal Matrix Image Source for Helmet Mounted Displays (HMDs) |
APR 88 |
24 pages |
| Authors:
John E. Gunther; Ronald G. Hegg; HUGHES AIRCRAFT CO LOS ANGELES CA DISPLAY SYSTEMS LAB
|
| The Liquid Crystal Matrix Image Source for Helmet Mounted Displays program was started in September 1982, with the dual objectives of, first, demonstrating the status of miniature liquid crystal light modulating devices and, second, developing a very high brightness image source for experimentation with helmet mounted display optical concepts. This image source was desired for experiments with helmet mounted display configurations in which an off-helmet image source is coupled to ... |
|
| Annual Gaseous Electronics Conference (38th) Held at Monterey, California on 15-18 October 1985. Program and Abstracts |
18 OCT 85 |
|
| Authors:
NAVAL RESEARCH LAB WASHINGTON DC
|
| Contents: Electron-Molecule Collisions: Excitation, XUV Lasers, Collision, Discharges, Photonics, Electron-Molecule Collisions: Attachment, High Pressure Arc Lamps, Ion-Molecule Reactions, DC-Glows, Electron-Molecule Collisions: Total Scattering and Excitation, Plasma Chemistry, Symposium on Ion- Molecule Reactions, Breakdown, Loeb Commemorative Session, Heavy Particle Collisions, Ionization and Electron Heating; Gas Lasers, Sheaths and Distribution Functions, R-F Discharges, Arcs and Switching, and Invited Lectures. |
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| Design and Construction of a CW ND:YAG Laser Using a Single Elliptical Cavity and Water Cooled Krypton Arc Lamp Pumping |
DEC 84 |
|
| Authors:
B. T. Burkett; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A continuous wave neodymium:YAG laser was designed and constructed using a water cooled krypton arc lamp as the pump source in a single elliptical cavity. Operational testing of the system could not be done due to technical problems with running the arc, but fluorescence measurements on the cavity were made using a tungsten filament lamp. The results were compared with those of previous projects which employed circular cylindrical cavities. The ... |
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| Aerodynamics of E-Beam Sustained Discharges in Flow |
14 APR 1983 |
|
| Authors:
Walter H. Christiansen; UNIV OF WASHINGTON SEATTLE
|
| The fundamental mechanism of the interaction of electric discharge of the glow type and the fluid mechanics normally found in electric discharge lasers has been studied. (Author) |
|
| Matched Filtering with Achromatic Optical Correlators |
23 FEB 1982 |
|
| Authors:
Juris Upatneiks; J. Graeme Duthie; Paul R. Ashley; ARMY MISSILE COMMAND REDSTONE ARSENAL AL RESEARCH DIRECTORATE
|
| An achromatic Fourier transform system for use in an optical correlator has been designed and used with incoherent light to obtain autocorrelations of pictures of aerial views of urban areas. The necessary optics included achromatic lenses and some highly achromatic holographic elements in a unique arrangement to produce wavelength independent Fourier transforms. (Author) |
|
| Development of a Color Alphanumeric Liquid Crystal Display. Volume 2 |
DEC 81 |
|
| Authors:
R. G. Hegg; J. E. Gunther; HUGHES AIRCRAFT CO LOS ANGELES CA DISPLAY SYSTEMS LAB
|
| This report encompasses efforts directed toward the development of a multicolor display suitable for aircraft command and control applications. The approach taken was to superimpose the images from two 175 x 175 element matrix liquid crystal displays using a dichroic beam splitter such that one display formed a red image while the other display formed a green image. The two displays were illuminated by a Xenon arc lamp and the ... |
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| Study and Development of an Integrated Head-Up Display |
JUN 1981 |
|
| Authors:
Michael N. Ernstoff; HUGHES AIRCRAFT CO EL SEGUNDO CA DISPLAY SYSTEMS LAB
|
| The purpose of the Integrated Head-Up Display (I-HUD) program was to demonstrate the advantages associated with using a Liquid Crystal Matrix Display and Diffraction Optics combiner in the design and construction of a high brightness head-up display system. The program resulted in the design and fabrication of the I-HUD brassboard consisting of a pilot's display unit, built in a form factor similar to that of the production F16 HUD, and ... |
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| Optimization of Long Life Laser Device. |
OCT 1977 |
|
| Authors:
L. Jay Rosenkrantz; David A. Huchital; PERKIN-ELMER CORP NORWALK CT
|
| A CW, long life Nd:YAG laser device utilizing an RF-excited electrodeless krypton arc lamp and appropriate for use in space has been designed, fabricated, optimized and tested. Multimode output power in excess of 1.5 watts and TEM mode output in excess of 0.6 (0.5 watts plane polarized) have been achieved for only 250 watts of RF input power. The 4MM diameter by 25mm long Nd:YAG laser rod was conductively cooled ... |
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| Long Life Nd:YAG Laser Device. |
MAY 1977 |
|
| Authors:
David A. Huchital; PERKIN-ELMER CORP NORWALK CT
|
| The developed electrodeless lamp is compatible with conductive cooling. It has been demonstrated that the life of such a lamp has been greater than 1000 hours of operation. Furthermore, it has been demonstrated that an output of one watt multimode at 1.06 micron can be achieved for an input of 215 watts of RF power to the lamp. (Author) |
|
| Laser Pump Lamp. |
FEB 1977 |
60 pages |
| Authors:
Norman C. Anderson; ILC TECHNOLOGY INC SUNNYVALE CA
|
| A program was conducted to continue development of a potassium-rubidium arc lamp for laser pumping. The average useful lifetime of such lamps was significantly increased, primarily as the result of improved lamp end seal technology. Life-times of nickel and Kovar endcap lamps built at the end of the program were typically in the 600-1000 hour range. The primary lamp failure mode was basal plane cleavage cracking of the sapphire envelopes. ... |
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| Pump Lamps for Nd:YAG Lasers. |
JUL 1974 |
|
| Authors:
Lowell Noble; Carl Kretschmer; ILC TECHNOLOGY INC SUNNYVALE CA
|
| This program is the second in a series designed to develop CW long-life, high-efficiency, low threshold power, Nd:YAG laser pump lamps for communications use. The goal for the space communications project (to be reached by 1975) is 1 watt laser output in the TEM sub 00 mode for 250 watts input. The laser rod is currently 50 mm x 3 mm diameter. The lamp arc length required is currently 1.9 ... |
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| RF Excited Krypton Arc Lamps for Pumping Nd: YAG Lasers. |
JUL 1974 |
|
| Authors:
D. A. Huchital; PERKIN-ELMER CORP NORWALK CONN
|
| A Nd:YAG laser pumped by an electrodeless krypton arc lamp is described. The baseline assumption is that an electrodeless lamp should exhibit substantially improved lifetime and reliability over a dc arc lamp, and verification of lifetime of over 1000 hours in a 25 watt laser has been obtained. Radio frequency energy is coupled into the annular lamp from an induction coil whose impedance is matched to a 50 ohm ... |
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| Evaluation of Sensors for SPACETRACK Augmentation (ESSA). Volume III. Photometric and Radiometric Calibration Procedures. |
01 JUN 1974 |
|
| Authors:
Walter M. Clark Sr; NORTHROP CORP PALOS VERDES PENINSULA CA ELECTRONICS DIV
|
| This report contains a series of basic photometric calibration procedures to be used in calibrating lamps, photometers, monochromators, and ancillary equipment. |
|
| Pulsed Inert Gas Plasma Model. |
02 MAY 1974 |
|
| Authors:
A. P. Passamante; G. D. Ferguson; NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AERO-ELECTRONIC TECHNOLOGY DEPT
|
| The report presents a spectral radiant emission model for the pulsed inert gas plasma arc lamp. The model is based on Kirchoff's law and NAVAIRDEVCEN evolved empirical data. Included in the discussion are some pertinent plasma arc parameters such as temperature, resistivity, collision frequency and their relation to arc current density. (Author) |
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| Production Engineering Measure: High Power Xenon Lamp. |
08 MAR 1974 |
|
| Authors:
James J. Malloy; ITT ELECTRON TUBE DIV EASTON PA
|
| Tests were performed and incorporated into engineering models to provide solutions to the problems experienced in operational characteristics of lamps being used in the field. The work consisted of redesign of the electrodes and application of new methods of manufacturing and inspection to provide increased life and reliability during operation. A unique design evolved which combines a depressurization sub-system integral with the lamp and compatible with the airborne environment for ... |
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| Laser Transmitter I. |
OCT 1973 |
|
| Authors:
J. E. Peterson; W. Culshaw; J. Kannelaud; F. Unterleitner; W. Austin; LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
|
| This report deals with the design, development, and delivery of a stable, frequency doubled, single-frequency Nd:YAG laser transmitter suitable for performance tests on a wide-bandwidth laser communication system. The laser is pumped by either a Kr arc lamp or by a potentially more efficient K-Rb lamp in an elliptical pump cavity, and it incorporates conductive cooling of the pumped rod. Suitable mechanical and electronic controls are provided which include an ... |
|
| A High Intensity Light Source. |
11 SEP 1973 |
|
| Authors:
Myer Geller; Daniel E. Altman; Glidden J. Barstow; DEPARTMENT OF THE NAVY WASHINGTON D C
|
| The patent describes a high intensity light source which produces the principal portion of its light energy output substantially within the spectral range of 4,600 A to 5,000 A. A sealed envelope of material substantially transparent to light energy within the aforementioned range contains electrically conductive electrodes, a suitable starter gas, preferably of an inert character, and also an amount of elemental metal. The electrodes have external terminals which, upon ... |
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| Long Life Krypton Arc Lamp For Pumping Nd:Yag Lasers. |
AUG 1973 |
|
| Authors:
E. Maris Grasis; Leonard Reed; ILC TECHNOLOGY INC SUNNYVALE CA
|
| The objective of this program was to develop a CW krypton are lamp with which to pump a 6 mm x 50 mm Nd:YAG laser rod to 100 watts laser output, at approximately 3% efficiency, for 500 hours of operation. Liquid coolants for use with the pump lamp were to be recommended. The optimal geometry of the lamp envelope for maximizing efficiency was investigated by using a standard state of ... |
|
| Diazo Printing Lamphouse. |
MAR 1973 |
|
| Authors:
Walter J. Jasionowski; Robert A. Bambenek; CHEMTRIC INC ROSEMONT IL
|
| This report describes the research and development work performed on improved light sources and a lamphouse for imaging diazo reproduction materials, Previously, mercury-vapor arc lamps dosed with metal halides were developed to improve spectral efficacy and, thereby, permit the attainment of higher printing speeds and/or lower power requirements. Under this program the spectral efficacy of these lamps was improved further by forcibly cooling the lamps so that higher wall loadings ... |
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| Compact Forced Convection Heat Exchanger Anode for 20 KW Xenon Short-Arc Lamps. |
24 OCT 1968 |
|
| Authors:
James R. Palmer; AEROSPACE CONTROLS CORP LOS ANGELES CALIF
|
| A Dynamic Force Thrust Convector Heat Exchanger, intended for use with air cooling of 20 KW short arc xernon lamps, was tested. The tests showed that the thermal balance could not be achieved within tolerable limits for the materials used: that natural circulation of the thermal medium was below useful limits: and that the design does not distribute the high density heat loading characteristic of the lamp anode so as ... |
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