In this study, the characteristics of surface radiation heat transfer properties of stainless steel 304with Black Nickel coating is investigated with and without exposure of sunlight to measure the emissivity (€) and absorptivity (ὰ). Exposure of sunlight is carried out for various time internals (240, 480, 720 and 960 hrs). For every 10 equal intervals, the material is measured for temperature dependency property. The emissivity (€) and absorptivity (ὰ) is measured for various spray...
Topic: Absorptivity & Emissivity
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215
Feb 20, 2013
02/13
by
Fussell, William B.
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Topics: Spectrum analysis., Emissivity.
Journal of Research of the National Bureau of Standards
Topics: Cavity, cylindrical cavity, diffusely reflecting, emissivity, normal emissivity, radiation,...
Journal of Research of the National Bureau of Standards
Topics: Conical, cylindrical, emissivity, nonisothermal
Journal of Research of the National Bureau of Standards
Topics: spectral emissivity, wavelength, blackbody, Inconel
Thermal images in the 8-12 /xm band were taken of the research vessel R/V POINT SUR in the Monterey Bay on 7 May 1991. The images were recorded using the AGA Thermovision 780 with an IBM AT computer using CATS 2.1 software. Corrections for computed transmittance, path length, and emissivity were made to the image files utilizing the locally developed computer program AGACATS. Temperature measurement distributions made with the AGA 780 compared to thermistor measurements of the ship temperatures...
Topics: Emissivity, AGA 780, thermal radiation, emissivity, path radiance, thermal imaging, LOWTRAN 6,...
http://uf.catalog.fcla.edu/uf.jsp?st=UF005024670&ix=nu&I=0&V=D&pm=1
Topics: Uranium--Thermal properties, Vacuum, Emissivity.
The optical properties of motor aluminum oxide are required inputs to current plume signature prediction codes, such as SIRRM. Accurate predictions are possible only if variations in the particle emissivity due to changes in particle size, contamination, and changing temperature, etc. , are known . This investigation demonstrated a simplified method for determination of the emissivity of rocket motor generated alumina. Plume particulate material was collected on tungsten alloy wire during motor...
Topics: Solid-Propellant, Rocket Motor, Alumina, Emissivity
100
100
Oct 8, 2015
10/15
by
Wood, David S.;Cooper, Alfred William Madison.
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Thesis advisor, A.W. Cooper
Topic: Emissivity,Blackbody radiation,Thermal analysis,Thermistors
Naval Postgraduate School
261
261
Dec 10, 2012
12/12
by
Wood, David S.;Cooper, Alfred William Madison.
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Thesis advisor, A.W. Cooper
Topics: Emissivity, Blackbody radiation, Thermal analysis, Thermistors
247
247
Jun 26, 2011
06/11
by
NON
texts
eye 247
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A converter for converting a low voltage direct current power source to a higher voltage, high frequency alternating current output for use in an electrical system where it is desired to use low weight cables and other circuit elements. The converter has a first stage series resonant (Schwarz) converter which converts the direct current power source to an alternating current by means of switching elements that are operated by a variable frequency voltage regulator, a transformer to step up the...
Topics: MOUNTING, OPENINGS, EMISSIVITY, ABSORPTIVITY, THERMAL INSULATION, PATENTS
Journal of Research of the National Bureau of Standards
Topics: emissivity, metal, infrared, thermocouple, temperature, Hagens-Ruben equation
377
377
Jun 2, 2011
06/11
by
Bloch, Gregory S.; Hah, Chunil
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A viewgraph presentation on the concept of compliant casing for transonic axial compressors is shown. The topics include: 1) Concept for compliant casing; 2) Rig and facility details; 3) Experimental results; and 4) Numerical results.
Topics: THERMOGRAPHY, INFRARED PHOTOGRAPHY, INFRARED RADIATION, SURFACE TEMPERATURE, POSITION (LOCATION),...
176
176
May 29, 2011
05/11
by
Bregman, Jesse D.; Temi, Pasquale; Rank, Davi
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Supernovae play a key role in the dynamics, structure, and chemical evolution of galaxies. The massive stars that end their lives as supernovae live for short times. Many are still associated with dusty star formation regions when they explode, making them difficult to observe at visible wavelengths. In active star forming regions (galactic nuclei and starburst regions), dust extintion is especially severe. Thus, determining the supernova rate in the active star forming regions of galaxies,...
Topics: EMISSIVITY, MICROELECTROMECHANICAL SYSTEMS, SATELLITE TEMPERATURE, TEMPERATURE CONTROL, WASTE HEAT,...
An investigation was made of the absorption coefficient and the index refraction as a function of both wavelength and temperature. Samples of single crystals of Al2O3 (sapphire) were heated to various temperatures up to 2020C. The absorption coefficient and index of refraction were measured as a function of wavelength from 0.546 microns to approximately 6 microns. Measurements of the emission of polycrystalline Al2O3, which is a ceramic material made for use in high temperature furnaces,...
Topics: DTIC Archive, PHILCO RESEARCH LABS NEWPORT BEACH CA, *SAPPHIRE, *INFRARED PHENOMENA, EMISSIVITY
Insulating finish for semiconductor heat dissipators from IERC 1966
Topics: unaffected, ierc, insulube, coating, insulating, properties, resistance, emissivity, corporation,...
Land surface temperature (LST) is an essential indicator of the Earth's surface energy budget. It is essential for urban micro-climate change studies and acts as a controlling variable in climatic models. The present study, LST retrieves with the improved mono-window algorithm from the Landsat-8 Thermal Infrared Sensor Band 10. The proportion of vegetation cover coupled with Normalized Difference Vegetation Index (NDVI) used for the estimation of emissivity. The derived emissivity and surface...
Topics: Emissivity, Land surface temperature, Landsat 8, Mono-window algorithm, NCR-India, NDVI
Journal of Research of the National Institute of Standards and Technology
Topics: blackbody, radiation thermometer, effective emissivity models, heat-pipe blackbody, lightpipe...
The rate of cooling in vacuum of tantalum cylinders of various sizes has been studied in the temperature range 1850 to 1300 K. The ratio of specific heat, C sub p, to total emissivity, epsilon, was found to be constant: C sub p/ epsilon 0.226 = 0.004 cal/gm/degree K.
Topics: DTIC Archive, CINCINNATI UNIV OH, *REFRACTORY METAL ALLOYS, TABLES(DATA), EMISSIVITY, EXPERIMENTAL...
322
322
May 29, 2011
05/11
by
Greene, Francis A.; Buck, Gregory M.; Wood, William A
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Computational and experimental hypersonic aerodynamic forces and moments and aeroheating levels for Kistler Aerospace Corporation's baseline orbiter vehicle at incidence are presented. Experimental data were measured in ground-based facilities at the Langley Research Center and predictions were performed using the Langley Aerothermodynamic Upwind Relaxation Algorithm code. The test parameters were incidence (-4 to 24 degrees), freestream Mach number (6 to 10),freestream ratio o specific heats...
Topics: COMPUTER PROGRAMS, SPACECRAFT TEMPERATURE, HEAT TRANSFER, SOLAR RADIATION, THERMODYNAMIC...
351
351
Jun 2, 2011
06/11
by
Barringer, Howard; Goldberg, Allen; Havelund, Klaus; Sen, Koushi
texts
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We briefly present a rule-based framework, called EAGLE, that has been shown to be capable of defining and implementing finite trace monitoring logics, including future and past time temporal logic, extended regular expressions, real-time logics, interval logics, forms of quantified temporal logics, and so on. In this paper we show how EAGLE can do linear temporal logic (LTL) monitoring in an efficient way. We give an upper bound on the space and time complexity of this monitoring.
Topics: HONEYCOMB CORES, SANDWICH STRUCTURES, THERMAL CONDUCTIVITY, PANELS, CORRUGATED SHELLS, TEMPERATURE...
348
348
May 31, 2011
05/11
by
Brandhorst, Henry W., Jr
texts
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Electric propulsion has emerged as a cost-effective solution to a wide range of satellite applications. Deep Space 1 successfully demonstrated electric propulsion as the primary propulsion source for a satellite. The POWOW concept is a solar-electric propelled spacecraft capable of significant cargo and short trip times for traveling to Mars. There it would enter areosynchronous orbit (Mars GEO equivalent) and beam power to surface installations via lasers. The concept has been developed with...
Topics: COMBUSTION, SOOT, EMISSIVITY, TEMPERATURE MEASUREMENT, RADIOMETERS, SOLID PROPELLANTS, SURFACE...
443
443
Jul 11, 2010
07/10
by
NON
texts
eye 443
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Investigations of the physics, dynamics, and interrelations of processes which develop in active regions of the sun are described, along with an analysis of apparatus applicable for solar observations and the conditions of the observations themselves. A model of the inhomogeneous chromosphere was also developed.
Topics: SOIL MOISTURE, SURFACE PROPERTIES, ULTRAHIGH FREQUENCIES, CLAYS, EARTH SURFACE, EMISSIVITY,...
115
115
Jul 25, 2010
07/10
by
Wharton, R. A., Jr.; Mckay, Christopher P.; Mancinelli, Rocco L.; Clow, G. D.; Simmons, G. M., Jr
texts
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The similarity of the early environments of Mars and Earth, and the biological evolution which occurred on early Earth, motivates exobiologists to seriously consider the possiblity of an early Martian biota. Environments are being identified which could contain Martian life and areas which may presently contain evidence of this former life. Sediments which were thought to be deposited in large ice-covered lakes are present on Mars. Such localities were identified within some of the canyons of...
Topics: EMISSIVITY, ENERGY DISSIPATION, NEUTRINOS, PAIR PRODUCTION, SUPERNOVAE, STELLAR CORES, STELLAR...
292
292
May 27, 2011
05/11
by
Thomson, Robert G.; Kruszewski, Edwin T
texts
eye 292
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The variational principle, differential equations, and boundary conditions governing the cross-sectional distortions due to inertia loading of a two-dimensional model of a thin monocoque wing are shown. A theoretical analysis of this simplified model is made in order to determine the nature of the coupling between the cross-sectional modes and the spanwise deformation modes. General solutions are obtained in finite-difference form for arbitrary cross sections and an exact solution is presented...
Topics: RADIATIVE HEAT TRANSFER, SPECTRAL EMISSION, PARALLEL PLATES, TUNGSTEN, HEAT TRANSMISSION,...
Direct resolution of Cygnus A at a frequency of 3292 Mc/s using the 52 inch fan beam of a compound interferometer is reported. On the basis of a firm determination of the actual peak-to-peak distance the existing data were examined and it was found that the reported dependence of separation on frequency is simply an appearance produced by the existence of a third-component whose spectrum differs from that of the main components.
Topics: DTIC Archive, Swarup, G, STANFORD UNIV CA, *RADIO ASTRONOMY, *RADIO SOURCES(ASTRONOMY), PARABOLAS,...
Near-surface air temperature and the underlying soil temperature are among the key components of the Earth's surface energy budget, and they are important variables for the comprehensive assessment of global climate change. Better understanding of the difference in magnitude between these two variables over high-latitude regions is also crucial for accurate detections of freeze and thaw (FT) states. However, these differences are not usually considered and included in current remote...
Topics: Freeze and thaw states, Ground-based observations, Land surface emissivity, Near-surface air...
This work involved a theoretical study of radiation transfer in droplet clouds, for predicting the performance of the liquid droplet radiator. The effects on droplet sheet emissivity of non isotropic scattering by droplets and of the development of a temperature profile on the droplet sheet are shown to be small.
Topics: DTIC Archive, Mattick,A T, WASHINGTON UNIV SEATTLE, *CLOUDS, *ELECTROMAGNETIC SCATTERING, RADIATIVE...
488
488
May 22, 2011
05/11
by
Pien, Home
texts
eye 488
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During GFY 91, Draper Laboratory was awarded a task by NASA-JSC under contract number NAS9-18426 to study and evaluate the potential for achieving safe autonomous landings on Mars using an on-board autonomous hazard detection and avoidance (AHDA) system. This report describes the results of that study. The AHDA task had four objectives: to demonstrate, via a closed-loop simulation, the ability to autonomously select safe landing sites and the ability to maneuver to the selected site; to...
Topics: ELECTROMAGNETIC INTERFERENCE, EMISSIVITY, OPTICAL PYROMETERS, RADIATION DETECTORS, RADIATION...
563
563
Jun 12, 2011
06/11
by
Bruce, R.; Taylor, G.; Beckmeyer, D.; Warren, S.; Dracon, S.; Powell, B.; Goodwin, D.; Rieder, P.; Nichols, R
texts
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Renewed interest in high-test peroxide, as a propellant, required the development of a facility capable of testing rocket propulsion systems. The development of this capability at the NASA Stennis Space Center (SSC), MS, focused on meeting this requirement. The challenges, accomplishments, and lessons learned associated with developing the SSC E3 Test Facility's high-test peroxide capability are presented herein.
Topics: MINERALOGY, SPACE INFRARED TELESCOPE FACILITY, TROJAN ASTEROIDS, INFRARED RADIATION, SILICATES,...
288
288
May 27, 2011
05/11
by
English, Roland D.; Carter, Howard S
texts
eye 288
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Convective heat-transfer tests were made on a 5-inch-diameter hemisphere to determine the variation of Stanton number with the ratio of wall temperature to total temperature. The tests were made at a nominal Mach number of 2 for stagnation temperatures of 760 deg R, 1,030 deg R, and 1,380 deg R. The model was constructed so that radiation effects and also streamwise conduction effects within the model skin were minimized. The results of the tests verified that these effects were small. Tests...
Topics: AEROSPACE ENVIRONMENTS, ULTRAVIOLET RADIATION, PRESSURE EFFECTS, SPACECRAFT CONSTRUCTION MATERIALS,...
The NASA self calibrating multiwavelength pyrometer is a recent addition to the list of pyrometers used in remote temperature measurement in research and development. The older one-color, two-color, and the disappearing filament pyrometers, as well as the multicolor and early multiwavelength pyrometers, all do not operate successfully in situations in which strong ambient radiation coexists with radiation originating from the measured surface. In such situations radiation departing from the...
Topics: NASA Technical Reports Server (NTRS), CALIBRATING, REMOTE SENSORS, TEMPERATURE MEASUREMENT,...
Pyrometers require calibrations to determine their instrument constants before they can be used in remote temperature measurements. These constants reflect the combined effects of detector response, the transmissivities of intervening optical media (windows and gases) and the emissivity of the measured surface. We describe here the principal and the demonstration of self calibrating 2-wavelength pyrometer.
Topics: NASA Technical Reports Server (NTRS), CALIBRATING, PYROMETERS, WAVELENGTHS, TEMPERATURE...
Total effective emissivity and spectral emissivity over the wavelength range of 0.65 to 6.3 microns were determined for temperatures from 1300 t0 2250 deg K. A multi channel radiometer was used in the arcjet and laboratory tests. The black-body-hole method was used to independently check radiometer results. The results show the silicon-carbide coated reinforced carbon composite material is a nongray radiator. The total effective emissivity and the spectral emissivity at 0.65 micron both...
Topics: NASA Technical Reports Server (NTRS), CARBON, COMPOSITE MATERIALS, OXIDATION RESISTANCE,...
Single crystals of tungsten and molybdenum from 1-10 cm long were produced by the Robison-plus-torsion technique in 4-5 mil filaments. These were studied in an improved electron projection diode, in which point-bypoint and average thermionic constants could be measured on the same filament. The work functions for various directions of single crystal molybdenum were found to be the same as those for single crystal tungsten. Also the average values of work function phi sub R and A sub R were 4.40...
Topics: DTIC Archive, NOTRE DAME UNIV IN, *MOLYBDENUM, *TUNGSTEN, SCATTERING, CRYSTAL GROWTH, THERMIONIC...
The development of more accurate wind vector retrieval algorithms for use with satellite-borne polarimetric microwave radiometers that correctly account for the effects of ocean surface foam on microwave emissivity.
Topics: DTIC Archive, WASHINGTON UNIV SEATTLE APPLIED PHYSICS LAB, *FOAM, *OCEAN SURFACE, *ROUGHNESS,...
511
511
May 29, 2011
05/11
by
Schwartz, Robert W.; Ballato, J.; Northwang, W. D.; Laoratanakul, P
texts
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Dome formation in Rainbow and Thunder actuators occurs to relieve thermal expansion mismatch stress between the metallic and piezoelectric layers during cooling from device fabrication temperatures. Accompanying this process is the generation of an internal stress profile within the devices and the development of significant tensile stresses within the surface region of the piezoelectric. These tensile stresses affect the domain configuration (ratio of c-to-a domains), and improve the 90 deg....
Topics: GRASSLANDS, SPATIAL RESOLUTION, ALGORITHMS, MICROWAVE IMAGERY, MICROWAVE SENSORS, RADIOMETERS,...
We present the 2D photoionization structure of the MHD winds of AGN accretion disks. We focus our attention on a specific subset of winds, those with poloidal currents that lead to density profiles n(r) \propto 1/r. We employ the code XSTAR to compute the local ionization balance, emissivities and opacity which are then used in the self-consistent transfer of radiation and ionization of a host of ionic species of a large number of elements over then entire poloidal plane. Particular attention...
Topics: NASA Technical Reports Server (NTRS), ACCRETION DISKS, X RAYS, PHOTOIONIZATION,...
Equipment and procedures were developed to measure normal spectral emittance of specimens that can be heated by passing a current through them, at temperatures in the range of 800 to 1400 K, and over the wavelength range of 1 to 15 microns. A data-processing attachment for the normal spectral emittance equipment was designed to (1) automaticallyct the measured emittance for '100% line' and 'zero line' errors on the basis of previously-recorded calibration tests; (2) record the corrected...
Topics: DTIC Archive, Harrison, William N, NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD, *EMISSIVITY,...
2,337
2.3K
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The overall objectives of the Symposium were to afford (1) an opportunity for workers in the field to describe the equipment and procedures currently in use for measuring thermal radiation properties of solids, (2) an opportunity for constructive criticism of the material presented, and (3) an open forum for discussion of mutual problems. It was also the hope of the sponsors that the published proceedings of the Symposium would serve as a valuable reference on measurement techniques for...
Topics: RADIATION MEASUREMENT, EMISSIVITY, EMITTANCE, SOLIDS, THERMAL RADIATION, THERMAL EMISSION,...
We present a method for atmospheric estimation in hyperspectral longwave infrared (LWIR) data. The method also involves the estimation of object parameters (temperature and emissivity) under the restriction that the emissivity is constant for all wavelengths. The method is analyzed with respect to its sensitivity to noise and number of spectral bands. Simulations with synthetic signatures and signatures from real vegetation are performed to validate the analysis.
Topics: DTIC Archive, SWEDISH DEFENCE RESEARCH AGENCY LINKOEPING, *HYPERSPECTRAL IMAGERY, EMISSIVITY,...
Spectral emissivities are give for Y2O3, Sm2O3, Gd2O3, Er2O3 and Lu2O3 in the visible portion of the spectrum for temperatures up to 1600 deg C. The data were obtained using a carbon arc image furnace as an energy source, a photovoltaic cell as a radiation detector, a thermocouple as a temperature detector, and a magnesium oxide smoked plate as a standard of reflectance. Emissivity is calculated from a curve of combined reflectance and emitted radiation versus temperature by using Kirchoff's...
Topics: DTIC Archive, McMahon, W R, AMES LAB IA, *EMISSIVITY, *SPECTRAL EMITTANCE, HIGH TEMPERATURE,...
Apparatus and process for determining the emissivity of a test specimen including an integrated sphere having two concentric walls with a coolant circulating therebetween, and disposed within a chamber which may be under ambient, vacuum or inert gas conditions. A reference sample is disposed within the sphere with a monochromatic light source in optical alignment therewith. A pyrometer is in optical alignment with the test sample for obtaining continuous test sample temperature measurements...
Topics: NASA Technical Reports Server (NTRS), EMISSIVITY, SPECTRAL EMISSION, LIGHT SOURCES, PATENTS, Halyo,...
Spectral emissivities of the v2-fundamental band of water have been measured between 550 and 2200 K. The hot water vapor samples were produced in a small supersonic burner using H2 and O2 gases. The variation of the spectral emissivities of H2O as a function of temperature has been obtained for a constant amoung of H2O in the optical path. An estimate of the integrated intensity of the 6.3-micron fundamental band has been made from the high temperature emission spectra. The observed integrated...
Topics: DTIC Archive, GENERAL DYNAMICS/ASTRONAUTICS SAN DIEGO CA, *BAND SPECTRA, *EMISSIVITY, *WATER VAPOR,...
Major emphasis was placed upon the screening program for chemiluminescent autoxidation reactions. Weak chemiluminescence was observed for almost all basecatalyzed reactions in aprotic solvents. The brightest visible emissions observed thus far have been the oxidations of benzoin and of 2-benzylimidazoline. The luminescence of lucigenin in alkaline peroxide oxidation in mixed solvents was studied as a function of THF concentration. Within the bounds determined by product precipitation, the peak...
Topics: DTIC Archive, MONSANTO RESEARCH CORP EVERETT MA, *LUMINESCENCE, EMISSIVITY, KETONES, NITRATES,...
This manuscript is the first in a sequence of documents that describe the development and verification of the various components of a sea surface infrared radiance simulator. We have developed an approach to modeling the sea surface radiance in the infrared to include both a coherent ship wake structure and an averaged background component. In this manuscript we discuss the component of the simulator for the ambient sea surface. The contribution from the background sea surface is determined by...
Topics: DTIC Archive, DEFENCE RESEARCH AND DEVELOPMENT ATLANTIC DARTMOUTH (CANADA), *OCEAN SURFACE, CANADA,...
175
175
Jun 20, 2010
06/10
by
Fujita, T.; Grandoso, H
texts
eye 175
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Tiros medium resolution scanning radiometer data from short and long wavelengths used to estimate cloud top temperatures, cloud cover, emissivity, and equivalent black body temperatures
Topics: BLACK BODY RADIATION, TEMPERATURE GRADIENTS, TEMPERATURE MEASUREMENT, CLOUD COVER, NEPHANALYSIS,...
239
239
Jun 18, 2010
06/10
by
Vasanov, Yu. A.; Zhulev, Yu. G
texts
eye 239
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Emissivity of pinnacled surface surrounded by black body space, and thermal radiation of cooled tube system with emissive triangular fins
Topics: BLACK BODY RADIATION, EMISSION, THERMAL RADIATION, COOLING FINS, EMISSION, EMISSIVITY, FINS,...
Basic thermal-radiation measurements, comprising total and broad-band spectral distribution of radiant energy, radiant energy function of field of view of the measuring instrument, and total radiant power versus time, are reported for the second thermal pulse of Shots 1, 2, 3, 5, 6, 9, and 10. All data were taken from ground stations at ranges as close as feasible to the detonations. The data are reported and analyzed to obtain the total thermal energy, the total thermal emission per unit of...
Topics: DTIC Archive, Hillendahl, R W, NORTHWESTERN UNIV EVANSTON IL TECHNOLOGICAL INST, *NUCLEAR...
The table of corrected optical pyrometer readings enables optical pyrometer users to convert observed temperature immediately to the true temperature, if the effective emissivity of the material being observed is known. The table gives observed temperatures from 1,000 to 3,000 K in increments of 5 degrees, from 3,000 to 5,000 K in increments of 10 degrees, from 5,000 to 10,000 K in increments of 50 degrees, and from 10,000 to 39,900 K in increments of 100 degrees. For these, true temperatures...
Topics: DTIC Archive, Poland, D E, NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD, *OPTICAL PROPERTIES,...
