Relevant bibliographies by topics / Angular emissivity

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

Academic literature on the topic 'Angular emissivity'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "Angular emissivity"

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Zhang, Yaqi, and Gerald Diebold. "Photothermal determination of the angular dependence of emissivity." Applied Optics 57, no. 22 (July 30, 2018): 6561. http://dx.doi.org/10.1364/ao.57.006561.

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Dimenna, R. A., and R. O. Buckius. "Electromagnetic Theory Predictions of the Directional Scattering From Triangular Surfaces." Journal of Heat Transfer 116, no. 3 (August 1, 1994): 639–45. http://dx.doi.org/10.1115/1.2910917.

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Angular predictions of directional scattering distributions for metal and dielectric surfaces with length scales of the order of the wavelength are made from rigorous electromagnetic scattering theory. The theoretical and numerical formulation of the electromagnetic scattering solution based on the extinction theorem is presented. One-dimensional triangular surface profiles are generated using a Fourier series representation for various correlation lengths, deviations, and surface peak positions. Bidirectional reflection functions and directional emissivities are calculated for the surface geometry parameters above and various optical properties. Angular enhancements in bidirectional reflection and emissivity are quantified. Angular scattering and emissivity predictions have been extended beyond those previously reported to include surfaces with equivalent correlation length and deviation.
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Chao, Jinlong, Chengyu Liu, Yingjun Xu, Wei Gu, Ying Li, and Feng Xie. "Multi-angular thermal infrared emission characteristics of Bohai Sea ice based on in situ measurements." Journal of Glaciology 61, no. 229 (2015): 864–74. http://dx.doi.org/10.3189/2015jog14j143.

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AbstractWe report on the radiative transfer process and optical properties of sea ice in the thermal infrared (TIR) band, presenting two new linear kernel driver models (Relative Emissivity Distribution Function, REDF) that describe TIR emission characteristics of smooth and rough ice. In order to test the models and determine the necessary coefficients, in situ measurements from the Bohai Sea were carried out during the 2011/12 and 2012/13 boreal winters. The results show that the relative emissivity of smooth sea ice decreases along with increasing viewing zenith angle, and the shape of the relative emissivity curve is similar to that of an ideal plane. Affected by parameters such as roughness and surface temperature distribution, the anisotropy of relative emissivity of sea ice with a high degree of roughness is stronger relative to the cosine emitter. The model coefficients were also obtained using a robust regression method based on the measured data. The presented models are more practical than the numerical radiative transfer model and can be used for multi-angular TIR remote sensing.
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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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Warren, T. J., N. E. Bowles, K. Donaldson Hanna, and J. L. Bandfield. "Modeling the Angular Dependence of Emissivity of Randomly Rough Surfaces." Journal of Geophysical Research: Planets 124, no. 2 (February 2019): 585–601. http://dx.doi.org/10.1029/2018je005840.

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REES, W. G., and S. P. JAMES. "Angular variation of the infrared emissivity of ice and water surfaces." International Journal of Remote Sensing 13, no. 15 (October 1992): 2873–86. http://dx.doi.org/10.1080/01431169208904088.

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García-Santos, Vicente, Enric Valor, Vicente Caselles, M. Ángeles Burgos, and César Coll. "On the angular variation of thermal infrared emissivity of inorganic soils." Journal of Geophysical Research: Atmospheres 117, no. D19 (October 10, 2012): n/a. http://dx.doi.org/10.1029/2012jd017931.

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Vidal, Matias, Clive Dickinson, S. E. Harper, Simon Casassus, and A. N. Witt. "Modelling the spinning dust emission from LDN 1780." Monthly Notices of the Royal Astronomical Society 495, no. 1 (April 30, 2020): 1122–35. http://dx.doi.org/10.1093/mnras/staa1186.

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ABSTRACT We study the anomalous microwave emission (AME) in the Lynds Dark Nebula (LDN) 1780 on two angular scales. With publicly available data at an angular resolution of 1°, we studied the spectral energy distribution of the cloud in the 0.408–2997 GHz frequency range. The cloud presents a significant (>20σ) amount of AME, making it one of the clearest examples of AME on 1 ° scales, and its spectrum can be well fitted with a spinning dust (SD) model. We also find at these angular scales that the location of the peak of the emission at lower frequencies (23–70 GHz) differs from the location at the higher frequencies (90–3000 GHz) maps. In addition to the analysis on 1° angular scales, we present data from the Combined Array for Research in Millimeter-wave Astronomy (CARMA) at 31 GHz with an angular resolution of 2 arcmin, in order to study the origin of the AME in LDN 1780. We studied morphological correlations between the CARMA map and different infrared tracers of dust emission. We found that the best correlation is with the 70- μm template, which traces warm dust (T ∼ 50 K). Finally, we study the difference in radio emissivity between two locations within the cloud. We measured a factor of ≈6 difference in 31-GHz emissivity. We show that this variation can be explained, using the SD model, by a variation on the dust grain size distribution across the cloud, particularly changing the fraction of polycyclic aromatic hydrocarbon for a fixed total amount of carbon.
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Ermida, Sofia L., Isabel F. Trigo, Glynn Hulley, and Carlos C. DaCamara. "A multi-sensor approach to retrieve emissivity angular dependence over desert regions." Remote Sensing of Environment 237 (February 2020): 111559. http://dx.doi.org/10.1016/j.rse.2019.111559.

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Cuenca, Juan, and José A. Sobrino. "Experimental measurements for studying angular and spectral variation of thermal infrared emissivity." Applied Optics 43, no. 23 (August 10, 2004): 4598. http://dx.doi.org/10.1364/ao.43.004598.

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Dissertations / Theses on the topic "Angular 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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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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Book chapters on the topic "Angular emissivity"

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Svoboda, Jiří, Michal Dovčiak, René W. Goosmann, and Vladimír Karas. "On the Interplay Between Radial and Angular Reflection Emissivity from the Black Hole Accretion Disc." In Springer Proceedings in Physics, 415–22. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06761-2_57.

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Conference papers on the topic "Angular emissivity"

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Zhang, Yaqi, and Gerald J. Diebold. "Measurement of angular dependence of emissivity through photothermal effect." In 3D Image Acquisition and Display: Technology, Perception and Applications. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/3d.2018.jtu4a.5.

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Niclos, Raquel R., Enric Valor, Vicente Caselles, and Cesar Coll. "Sea surface emissivity angular measurements: comparison with theoretical models." In Remote Sensing, edited by Charles R. Bostater, Jr. and Rosalia Santoleri. SPIE, 2004. http://dx.doi.org/10.1117/12.512377.

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Schott, John R. "Incorporation Of Angular Emissivity Effects In Long Wave Infrared Image Models." In 30th Annual Technical Symposium, edited by Richard A. Mollicone and Irving J. Spiro. SPIE, 1986. http://dx.doi.org/10.1117/12.936495.

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Garcia, V., M. Mira, E. Valor, V. Caselles, C. Coll, and J. M. Galve. "Angular dependence of the emissivity of bare soils in the thermal infrared." In 2009 IEEE International Geoscience and Remote Sensing Symposium (IGARSS 2009). IEEE, 2009. http://dx.doi.org/10.1109/igarss.2009.5418015.

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Sobrino, Jose A., Juan Cuenca, Mohamed H. El Kharraz, and Laura Dempere-Marco. "Experimental investigation of the angular variation of emissivity in the thermal infrared band." In Remote Sensing, edited by Edwin T. Engman. SPIE, 1998. http://dx.doi.org/10.1117/12.332778.

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Shor, Eric H., Carl Salvaggio, and John R. Schott. "Three-dimensional longwave infrared synthetic image generation incorporating angular emissivity effects using ray-tracing techniques." In San Dieg - DL Tentative, edited by Irving J. Spiro. SPIE, 1990. http://dx.doi.org/10.1117/12.23080.

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Ma, Jing, Yasong Sun, and Benwen Li. "Parametric Study of Simultaneous Radiative Transfer in Plane-Parallel Scattering Medium With Variable Refractive Index by Spectral Collocation Method." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17689.

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In this work, a spectral collocation method is developed to simulate radiative transfer in a refractive planar medium. The space and angular domains of radiative intensity are discretized by Chebyshev polynomials, and the angular derivative term and the integral term of radiative transfer equation are approximated by spectral collocation method. The spectral collocation method can provide exponential convergence and obtain high accuracy even using few nodes. There is a very satisfying correspondence between the spectral collocation results and available data in literatures. Influence of the extinction coefficient, the scattering albedo, the scattering phase function, the gradient of refractive index and the emissivity of boundary are investigated for the plane-parallel scattering medium with variable refractive index.
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Wang, Weijie, Ceji Fu, and Wenchang Tan. "Spectral and Directional Control of Thermal Radiation With Periodic Structured Materials." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75139.

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Spectral and directional control of thermal emission holds substantial importance in different kinds of applications, where heat transfer is predominantly by thermal radiation. Several configurations have previously been proposed, like using gratings, photonic crystals, and resonant cavities. In the present work, we theoretically investigate the influence of periodic microstructures such as micro-scale gratings and photonic crystals on the thermal radiative properties of a structure constituted with these periodic microstructures. The enhanced thermal emission is found to be due to different excitation modes and the coupling between them. In order to offer insight into the mechanisms, we calculate and visualize the electromagnetic field profile at specified emission peaks. Furthermore, the emissivity pattern is calculated as a function of the emission angle and the angular frequency. The results reveal detailed spectral and directional dependence, and omnidirectional feature of thermal emission from the proposed structure. We show that it is possible to flexibly control the emission behavior by adjusting the structure dimensional parameters properly.
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Jung, Jun Yeong, and Yong Hoon Jeong. "Heat Transfer Coefficient Measurement for Downward-Facing Heat Transfer on Curved Rectangular Water Channel." In 2016 24th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/icone24-60726.

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In-Vessel Retention by External Reactor Vessel Cooling (IVR-ERVC) is method of removing the decay heat by cooling reactor vessel after corium relocation, and is also one of severe accident management strategies. Estimating heat transfer coefficients (HTCs) is important to evaluate heat transfer capability of the ERVC. In this study, the HTCs of outer wall of reactor vessel lower head were experimentally measured under the IVR-ERVC situation of Large Loss of Coolant Accident (LLOCA) condition. Experimental equipment was designed to simulate flow boiling condition of ERVC natural circulation, and based on APR+ design. This study focused on effects of real reactor vessel geometry (2.5 m of radius curvature) and material (SA508) for the HTCs. Curved rectangular water channel (test section) was design to simulate water channel which is between the reactor vessel lower head outer wall and thermal insulator. Radius curvature, length, width and gap size of the test section were respectively 2.5 m, 1 m, 0.07 m and 0.15 m. Two connection parts were connected at inlet and outlet of the test section to maintain fluid flow condition, and its cross section geometry was same with one of test section. To simulate vessel lower head outer wall, thin SA508 plate was used as main heater, and test section supported the main heater. Thickness, width, length and radius curvature of the main heater were 1.2 mm, 0.07 m, 1 m and 2.5 m respectively. The main heater was heated by DC rectifier, and applied heat flux was under CHF value. The test section was changed for each experiment. The HTCs of whole reactor vessel lower head (bottom: 0 ° and top: 90 °) were measured by inclining the test section, and experiments were conducted at four angular ranges; 0–22.5, 22.5–45, 45–67.5 and 67.5–90 °. DI water was used as working fluid in this experiment, and all experiments were conducted at 400 kg/m2s of constant mass flux with atmospheric pressure. The working fluid temperatures were measured at two point of water loop by K-type thermocouple. The main heater surface temperatures were measured by IR camera. The main heater was coated by carbon spray to make uniform surface emissivity, and the IR camera emissivity calibration was also conducted with the coated main heater. The HTCs were calculated by measured main heater surface temperature. In this research, the HTC results of 10, 30, 60 and 90 ° inclination angle were presented, and were plotted with wall super heat.
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Tencer, John. "The Impact of Reference Frame Orientation on Discrete Ordinates Solutions in the Presence of Ray Effects and a Related Mitigation Technique." In ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-40445.

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The discrete ordinates method is a popular and versatile technique for deterministically solving the radiative transport which governs the exchange of radiant energy within a fluid or gas mixture. It is the most common ‘high fidelity’ technique used to approximate the radiative contribution in combined-mode heat transfer applications. A major drawback of the discrete ordinates method is that the solution of the discretized equations may involve nonphysical oscillations due to the nature of the discretization in the angular space. These ray effects occur in a wide range of problems including those with steep temperature gradients either at the boundary or within the medium, discontinuities in the boundary emissivity due to the use of multiple materials or coatings, internal edges or corners in non-convex geometries, and many others. Mitigation of these ray effects either by increasing the number of ordinate directions or by filtering or smoothing the solution can yield significantly more accurate results and enhanced numerical stability for combined mode codes. When ray effects are present, the solution is seen to be highly dependent upon the relative orientation of the geometry and the global reference frame. This is an undesirable property. A novel ray effect mitigation technique is proposed. By averaging the computed solution for various orientations, the number of ordinate directions may be artificially increased in a trivially parallelizable way. This increases the frequency and decreases the amplitude of the ray effect oscillations. As the number of considered orientations increases a rotationally invariant solution is approached which is quite accurate. How accurate this solution is and how rapidly it is approached is problem dependent. Uncertainty in the smooth solution achieved after considering a relatively small number of orientations relative to the rotationally invariant solution may be quantified.
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