Relevant bibliographies by topics / Directional emissivity

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers
  4. Reports

Academic literature on the topic 'Directional emissivity'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Directional emissivity"

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Taimarov, M. A., K. A. Rusev, and F. A. Garifullin. "Directional emissivity of structural materials." Journal of Engineering Physics 49, no. 2 (August 1985): 939–42. http://dx.doi.org/10.1007/bf00872646.

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SOBRINO, J., J. JIMENEZMUNOZ, and W. VERHOEF. "Canopy directional emissivity: Comparison between models." Remote Sensing of Environment 99, no. 3 (November 30, 2005): 304–14. http://dx.doi.org/10.1016/j.rse.2005.09.005.

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IUCHI, Tohru, Tomoyuki TSURUKAWAYA, and Akira TAZOE. "Emissivity Compensated Radiation Thermometry Using Directional Radiances." Transactions of the Society of Instrument and Control Engineers 34, no. 3 (1998): 175–81. http://dx.doi.org/10.9746/sicetr1965.34.175.

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Wald, Andrew E., and John W. Salisbury. "Thermal infrared directional emissivity of powdered quartz." Journal of Geophysical Research: Solid Earth 100, B12 (December 10, 1995): 24665–75. http://dx.doi.org/10.1029/95jb02400.

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Kowsary, F., and J. R. Mahan. "Radiative Characteristic of Spherical Cavities With Specular Reflectivity Component." Journal of Heat Transfer 128, no. 3 (July 28, 2005): 261–68. http://dx.doi.org/10.1115/1.2151196.

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An exact analytical method is presented for determination of emissive as well as absorptive performance of spherical cavities having diffuse-specular reflective walls. The method presented utilizes a novel coordinate transformation technique, which provides convenient means for setting up the governing radiant exchange integral equations. These equations are then solved by the usual iterative method devized for the Fredholm integral equation of the second kind. The suggested coordinate transformation is also utilized for determination of directional absorptivity of a fully specular spherical cavity when collimated radiation enters through its mouth from a specified direction. Results show that for a spherical cavity the dependence of the apparent emissivity on the degree of specularity is high when the emissivity of the cavity wall is low, but this dependence decreases as the emissivity of the cavity wall increases. Also there are situations, unlike cases of cylindrical and conical cavities, for which the purely diffuse spherical cavity is a more efficient emitter than the purely specular cavity having an identical geometry and wall emissivity. Moreover, it is shown that the apparent directional absorptivity of specular spherical cavities having small openings becomes highly fluctuating as the direction of the incident radiation changes
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Zhang, Li Yong, and Yu Kun Liang. "The Equipment on High Sensitive Test of Infrared Directional Emissivity of Materials." Advanced Materials Research 291-294 (July 2011): 1272–77. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.1272.

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This paper introduces an approach of novel principle to measure the directional emissivity of material surfaces direct. The value of the infrared directional emissivity is obtained by comparing the surface spectral emissivity of testing samples to a blackbody reference. Weak signals are measured with pyroelectric detector by optical modulation and phase-locked amplified technologies. Our experiment is implemented with stainless steel in circumstance of 20 - 300°C, the testing sample is 8µm- 14μm. Compare to the reference and the calibration value without a cooling process, combined uncertainty is less than 0.04, and the result is satisfied.
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Xu, Jin, Jyotirmoy Mandal, and Aaswath P. Raman. "Broadband directional control of thermal emission." Science 372, no. 6540 (April 22, 2021): 393–97. http://dx.doi.org/10.1126/science.abc5381.

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Controlling the directionality of emitted far-field thermal radiation is a fundamental challenge. Photonic strategies enable angular selectivity of thermal emission over narrow bandwidths, but thermal radiation is a broadband phenomenon. The ability to constrain emitted thermal radiation to fixed narrow angular ranges over broad bandwidths is an important, but lacking, capability. We introduce gradient epsilon-near-zero (ENZ) materials that enable broad-spectrum directional control of thermal emission. We demonstrate two emitters consisting of multiple oxides that exhibit high (>0.7, >0.6) directional emissivity (60° to 75°, 70° to 85°) in the p-polarization for a range of wavelengths (10.0 to 14.3 micrometers, 7.7 to 11.5 micrometers). This broadband directional emission enables meaningful radiative heat transfer primarily in the high emissivity directions. Decoupling the conventional limitations on angular and spectral response improves performance for applications such as thermal camouflaging, solar heating, radiative cooling, and waste heat recovery.
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Kononogova, Elena, Albert Adibekyan, Christian Monte, and Jörg Hollandt. "Characterization, calibration and validation of an industrial emissometer." Journal of Sensors and Sensor Systems 8, no. 1 (June 27, 2019): 233–42. http://dx.doi.org/10.5194/jsss-8-233-2019.

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Abstract. We report on the radiometric characterization and calibration of the TIR 100-2 (INGLAS Produktions GmbH, 2019) industrial emissometer. This instrument is used for handheld, on-site directional total emissivity measurements in industrial applications, e.g., the measurement of the emissivity of highly reflective thermal insulation materials. The diameter of the measurement field is determined by two different methods. The emissometer is calibrated with three different sets of low- and high-emissivity reference samples. Each calibration is validated by comparing the results of the TIR 100-2 to directional total emissivity results of the Emissivity Measurement in Air Facility (EMAF) at the Physikalisch-Technische Bundesanstalt (PTB), Berlin. Finally, the hemispherical total emissivity of highly reflective thermal insulation materials is determined using the TIR 100-2 according to the European Standard EN 12898, and, again, the results are validated with results obtained at the EMAF.
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Zhao Wanmeng, 赵晚梦, 李龙飞 Li Longfei, 原泽野 Yuan Zeye, 王刚圈 Wang Gangquan, 刘玉芳 Liu Yufang, and 于坤 Yu Kun. "Directional Spectral Emissivity of Ti-6Al-4V Alloy." Acta Optica Sinica 40, no. 8 (2020): 0830002. http://dx.doi.org/10.3788/aos202040.0830002.

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Niu, Chun-Yang, Hong Qi, Ya-Tao Ren, and Li-Ming Ruan. "Apparent directional spectral emissivity determination of semitransparent materials." Chinese Physics B 25, no. 4 (April 2016): 047801. http://dx.doi.org/10.1088/1674-1056/25/4/047801.

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Dissertations / Theses on the topic "Directional emissivity"

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Campione, Ivo. "Integrazione tra analisi termografica e rilievo tridimensionale: studio metodologico e verifiche sperimentali." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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La termografia 3D, tema oggetto di molta ricerca negli ultimi anni, sfrutta tecniche di data fusion che consentono l’integrazione tra dato termografico e dato tridimensionale, proveniente da strumenti di ingegneria inversa. La termografia 3D ha numerose applicazioni e potenzialità, le più note in ambito ingegneristico, medico e di conservazione dei beni culturali. Partendo dalla tesi di dottorato dell’Ing. Francesca Lucchi e da un’accurata analisi dello stato dell’arte, è stata sviluppata una metodologia, per quanto possibile rigorosa ma di agevole implementazione, per unire i dati provenienti da un laser scanner e da una termocamera, al di fine di creare una nuvola di punti completata con i valori delle temperature. Poiché la radiazione percepita dai sensori della termocamera è affetta da un errore sistematico dipendente dalla geometria dell’oggetto esaminato, nella seconda parte della tesi è stato applicato un modello di correzione delle temperature che sfrutta la conoscenza della geometria dell’oggetto, e sono stati effettuati vari esperimenti per verificarne l’efficacia. La tecnica di integrazione messa a punto in questo lavoro di tesi, anche attraverso la scrittura di codice originale in Matlab, non necessita di una lunga fase iniziale di set-up, e consente di mantenere i due dispositivi completamente indipendenti tra loro, rendendola particolarmente versatile ma mantenendo allo stesso tempo un elevato livello di precisione ed accuratezza.
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Bickel, Robert. "An Experimental Method of Measuring Spectral, Directional Emissivity of Various Materials and Joule Heating." UKnowledge, 2015. http://uknowledge.uky.edu/me_etds/60.

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Emissivity is an important parameter in calculating radiative cooling of a surface. In experiments at the NASA Ames hypervelocity ballistic range, one of the main errors indicated in temperature measurements is the uncertainty of emissivity for the materials under investigation. This thesis offers a method for measuring emissivity of materials at elevated temperatures at the University of Kentucky. A test specimen which consists of different sample materials under investigation and a blackbody cavity was heated in a furnace to an isothermal condition at known temperature. The emitted thermal radiation was measured and the comparison of sample and blackbody radiation yielded the desired emissivity. In addition to the furnace measurements, separate experiments were conducted in ambient air to determine how much irradiation is reflected back to the samples from the radiation shield used in the furnace to block undesired ambient radiation. Here, the sample heating was accomplished by applying a direct current across the samples. ANSYS simulations were performed to assist the design and analysis. Experiments were conducted in ambient air and a vacuum environment to verify these simulations.
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Ren, Huazhong. "Modelling of directional thermal radiation and angular correction on land surface temperature from space." Phd thesis, Université de Strasbourg, 2013. http://tel.archives-ouvertes.fr/tel-00967047.

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The aim of this thesis is the modeling of surface directional thermal radiation and angular correction on the LST by using empirical and physical methods as well as the analysis of field validation. The work has conducted to some conclusions. The directional emissivity of natural surfaces was obtained from MODIS emissivity product and then used in the split-window algorithm for angular correction on LST. The parameterization models of directional emissivity and thermal radiation were developed. As for the non-isothermal pixels, the daytime-TISI method was proposed to retrieve directional emissivity and effective temperature from multi-angular middle and thermal infrared data. This was validated using an airborne dataset. The kernel-driven BRDF model was checked in the thermal infrared domain and its extension was used to make angular normalization on the LST. A new model, namely FovMod that concerns on the footprint of ground sensor, was developed to simulate directional brightness temperature of row crop canopy. Based on simulation result of the FovMod, an optimal footprintfor field validation of LST was obtained. This thesis has systematically investigated the topic of directional thermal radiation and angular correction on surface temperature and its findings will improve the retrieval accuracy of temperature and emissivity from remotely sensed data and will also provide suggestion for the future design of airborne or spaceborne multi-angular thermal infrared sensors and also for the ground measurement of surface parameters.
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Hyll, Caroline. "Infrared Emittance of Paper : Method Development, Measurements and Application." Licentiate thesis, KTH, Mätteknik och optik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-104755.

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Thermography is a non-destructive technique which uses infrared radiation to obtain the temperature distribution of an object. The technique is increasingly used in the pulp and paper industry. To convert the detected infrared radiation to a temperature, the emittance of the material must be known. For several influencing parameters the emittance of paper and board has not previously been studied in detail. This is partly due to the lack of emittance measurement methods that allow for studying the influence of these parameters. An angle-resolved goniometric method for measuring the infrared emittance of a material was developed in this thesis. The method is based on the reference emitter methodology, and uses commercial infrared cameras to determine the emittance. The method was applied to study the dependence on wavelength range, temperature, observation angle, moisture ratio, sample composition, and sample structure of the emittance of paper and board samples. It was found that the emittance varied significantly with wavelength range, observation angle and moisture ratio. The emittance was significantly higher in the LWIR (Long-Wavelength Infrared) range than in the MWIR (Mid-Wavelength Infrared) range. The emittance was approximately constant up to an observation angle of 60° in the MWIR range and 70° in the LWIR range, respectively. After that it started to decrease. The emittance of moist samples was significantly higher than that of dry samples. The influence of moisture ratio on the emittance could be estimated based on the moisture ratio of the sample, and the emittance of pure water and dry material, respectively. The applicability of measured emittance values was demonstrated in an investigation of the mechanical properties of sack paper samples. An infrared camera was applied to monitor the generation of heat during a tensile test of a paper sample. It was found that the observed increase in thermal energy at the time of rupture corresponded well to the value of the elastic energy stored in the sample just prior to rupture. The measured emittance value provided an increased accuracy in the thermal energy calculation based on the infrared images.

QC 20121121

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Zhang, Cheng. "Influence of surface roughness on thermography measurement." Thesis, Högskolan Väst, Avd för automationssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-6842.

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This university Bachelor's Thesis was performed to explore the influence of surface roughness on the thermography measurement. Thermography is a non-destructive testing method which can be used to detect cracks. However, it is hard to define how the surface roughness influences the emissivity and the result of a thermography measurement, as well as how the angle of the excitation source influences the result. Therefore, this work aims to define how the heating angle and surface roughness influence the thermography measurement, define the relationship between surface roughness and emissivity for the same crack, and define the influence of the angles which composed of the heating source, the direction of crack and the direction of surface roughness on thermography measurement. In this report, the theories of radiation and Signal-to-noise ratio (SNR) were explained, clearly. Also, two kinds of experiments were set up. One is focus on how the heating angle influence the thermography measurement, the other is focus on how the angle of the heating source, in relation to the crack direction and the direction of surface roughness, influence the SNR value. The conclusions of these experiments are that the heating of a crack increases as the angle decreases (from wide side to narrow side) and the angle ofincreases (from horizontal to vertical). Moreover, the SNR value decreases as the surface roughness increases. For the same surface roughness, the SNR value increases with increased crack angle (0°, 45° or 90°) and with decreased sample position angle (horizontal, 45°or vertical). What is more, the higher surface roughness, the larger the influence of the crack angle and the sample position angle. Finally, when the surface is polish, the crack angle and the sample position angle does not have any influence.
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Chun-HungCheng and 鄭鈞鴻. "Development of a Hemispherical Radiative Properties Measurement System and Directional Emissivity Measurement System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/06623663029243217871.

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碩士
國立成功大學
機械工程學系
104
All objects emit radiation if it’s temperature higher than 0 K. Therefore, the related application of radiation is common around the world. In order to study the properties of radiation or to check whether the efficacy of the product fulfil the expectation or not, a radiative measurement system is necessary. The purpose of this study is to develop two radiative measurement system, Hemispherical Radiative Properties Measurement System and Directional Emissivity Measurement System. The former system consists of two sub-system, monochromatic light supply system and signal process system. The monochromatic light supply system includes the lamp, the light filter and the monochromator, which can provide the monochromatic light. The signal process system consist of the chopper, the integrating sphere and lock-in amplifier. The goal of the former system is to measurement the directional-hemispherical radiative properties, which can deal with the sample with the special surface that will let the incident light occur scattering or diffusion. The wavelength range of the system are 2.5 – 4.5 m and 8 – 12 m. The other system consists of black body, home-made heater and FTIR, which can measure the directional emissivity in specific temperature. The wavelength range of the system is 2.5 – 28.5m. The Soda-lime glass, CaF2, Al2O3, and gold are used as the reference to test the measurement system.
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Wu, Dong-Han, and 吳東翰. "Construction of Numerical Model for Obtaining Optical Constants and Development of Automatic Measurement System for High Temperature Directional Emissivity." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5qadd3.

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碩士
國立清華大學
動力機械工程學系
106
Emissivity is a fundamental thermos-physical property, defined as the ratio of emitted intensity from a real surface to an ideal surface (blackbody) at same temperature. Tailored emissivity, showing wavelength-selectivity or direction-dependence is important in energy-harvesting, optoelectronics, and thermal applications. In this study, a numerical model for obtaining optical constants using infrared emissivity spectra of different emission angles was successfully established. The numerical model was verified with thermal radiative properties of ZnS in the wavelength range between 8 um and 14 um. The other contribution of this study was to develop an automatic measurement system for high temperature directional emissivity. This system was composed of a blackbody oven, sample heater, optical elements, FTIR spectrometer and a LabVIEW user interface. The emissivity of sapphire, gold, iron, and SiC was used to verify the working range of measurement system from 400 K to 700 K in temperature, 0º to 60º in emission degree, and 4 μm to 25 μm in wavelength. Measurement results of directional emissivity agree well with those from numerical prediction. They are also consistent with results in the published references. The two contributions, the developed numerical model and automatic measurement system, show results supporting each other.Both can provide large beneifits to insightful investigation on radiative properties of materials at high temperatures as well as utilization of these properties.
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Conference papers on the topic "Directional emissivity"

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Danov, M., D. Stoyanov, and D. Petkov. "Directional reflectance approach for emissivity estimation." In 15th International School on Quantum Electronics: Laser Physics and Applications, edited by Tanja Dreischuh, Elena Taskova, Ekaterina Borisova, and Alexander Serafetinides. SPIE, 2008. http://dx.doi.org/10.1117/12.822514.

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Sawicki, P., R. Stein, and B. Wiecek. "Directional emissivity correction by photogrammetric 3D object reconstruction." In 1998 Quantitative InfraRed Thermography. QIRT Council, 1998. http://dx.doi.org/10.21611/qirt.1998.052.

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Ellis, A. R., H. M. Graham, Michael B. Sinclair, and J. C. Verley. "Variable-angle directional emissometer for moderate-temperature emissivity measurements." In Optical Engineering + Applications, edited by Zu-Han Gu and Leonard M. Hanssen. SPIE, 2008. http://dx.doi.org/10.1117/12.796507.

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Cheng, Qiang, Xiang-Yu Zhang, Zhi-Chao Wang, Huai-Chun Zhou, and Lv-Bin Wu. "The Simulation of Apparent Directional Emissivity in a Three-Dimensional Non-Isothermal Medium by the DRESOR Method." In ASME 2011 Power Conference collocated with JSME ICOPE 2011. ASMEDC, 2011. http://dx.doi.org/10.1115/power2011-55418.

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The emissivity as a thermal property plays an important role required for heat transfer calculations and temperature measurement. In an isothermal purely absorption medium, the emissivity can be calculated by the formula, but no general formula for the emissivity will suit the system with scattering of medium and reflection of walls in a coal-fired boiler or an industrial heating furnace. In this study, a new approach was proposed to scale the apparent field directional emissivity by DRESOR method combined with two-color method in a three-dimensional non-isothermal participating medium with reflection of walls. The results obtained by the new method were compared with those calculated by the formula to verify the validity and accuracy of new method in an isothermal purely absorption medium. Then the new method was extended to examine the effect of absorption coefficient, scattering coefficient and reflection of walls on the apparent directional emissivity in the isothermal and non-isothermal cases. It is found that when there is scattering in the medium, the emissivity cannot be equal to the entity, even if the medium is optically thick. In the condition of walls with cold or low temperature, such as in the case of a coal-fired boiler, the apparent emissivity increases with the increase of absorption coefficient and reflectivity of walls, because radiation from hot media plays a dominated role in emissivity in this situation; Meanwhile, in the case of walls with high temperature, such as in the case of an industrial heating furnace in metallurgy or glass melting industry, the apparent emissivity decreases with the increase of absorption coefficient, because the emissivity is mainly determined by the wall radiation in this situation. And when scattering coefficient increases, the apparent emissivity decreases for all isothermal and non-isothermal cases.
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LIN, J., W. SUTTON, and T. LOVE. "Solution of directional emissivity from isothermal dispersions by source function expansion technique." In 23rd Aerospace Sciences Meeting. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1985. http://dx.doi.org/10.2514/6.1985-405.

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Zhou, Yihui, and Zhuomin Zhang. "BRDF and Directional Emissivity of Semitransparent Silicon Wafers with a Rough Surface." In 8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3323.

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Yu, Yunyue, Ana C. Pinheiro, and Jeffrey L. Privette. "Correcting land surface temperature measurements for directional emissivity over 3D structured vegetation." In SPIE Optics + Photonics, edited by Wei Gao and Susan L. Ustin. SPIE, 2006. http://dx.doi.org/10.1117/12.682951.

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Wang, L. P., S. Basu, and Z. M. Zhang. "Direct and Indirect Methods for Calculating Thermal Emission From Layered Structures With Nonuniform Temperatures." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22499.

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The determination of emissivity of layered structures is critical in many applications, such as radiation thermometry, microelectronics, radiative cooling, and energy harvesting. Two different approaches, i.e., the “indirect” and “direct” methods, are commonly used for computing the emissivity of an object. For an opaque surface at a uniform temperature, the indirect method involves calculating the spectral directional-hemispherical reflectance to deduce the spectral directional emissivity based on Kirchhoff’s law. On the other hand, a few studies have used a combination of Maxwell’s equations with the fluctuation-dissipation theorem to directly calculate the emissivity. The present study aims at unifying the direct and indirect methods for calculating thermal emission from layered structures with a nonuniform temperature distribution. Formulations for both methods are given to illustrate the equivalence between the indirect and the direct methods. Thermal emission from an asymmetric Fabry-Perot resonance cavity with a nonuniform temperature distribution is taken as an example to show how to predict the intensity, emissivity, and the brightness temperature. The local density of states, however, can only be calculated using the direct method.
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Surzhikov, Sergey. "Spectral and Narrow Band Directional Emissivity of Light-Scattering and Non-Scattering Volumes." In 8th AIAA/ASME Joint Thermophysics and Heat Transfer Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-3324.

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Anderson, Richard A. "Polarized properties of the directional-hemispherical reflectance and emissivity of an opaque surface." In San Diego '92, edited by Walter G. Egan. SPIE, 1992. http://dx.doi.org/10.1117/12.138830.

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Reports on the topic "Directional emissivity"

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Norman, J. M., and L. K. Balick. Measurement of directional thermal infrared emissivity of vegetation and soils. Office of Scientific and Technical Information (OSTI), October 1995. http://dx.doi.org/10.2172/114459.

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