Calculation of thermal emissivity for thin films by a direct method

Pigeat, P.; Rouxel, Didier; Wéber, B.

doi:10.1103/physrevb.57.9293

Cited by 64 publications

(35 citation statements)

References 26 publications

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“…In ref. [21] the emissivity of a thin film on an opaque substrate ( Fig. 17) is directly calculated and the result is compared with measurements of the growth of diamond on silicon substrate (Fig.…”

Section: Appendixmentioning

confidence: 99%

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Influence of minor additions on the emissivity of the oxide scale of FeCrAlY alloys during resistance heating

Hattendorf¹

2011

Materials & Corrosion

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Chromium aluminum yttrium (FeCrAlY) alloys owe their low oxidation rate to the formation of a slow growing α‐alumina scale. For material used for heating elements not only the life time and the behavior of the resistance during the life time is of relevance, but also the emission coefficient of the oxide scale. The power density JS produced by resistance heating of strip with 50 µm thickness and about 5–6 mm width at 1050 °C is approximately equal to the radiant flux density, which is according to Stefan–Boltzmann's law proportional to the total emission coefficient εg. Resistance heating tests were performed on samples made from FeCrAlY alloys with different zirconium and carbon content. The “high zirconium” containing FeCrAlY alloys (zirconium > about 0.10%) have a higher power density/emissivity than the “low zirconium” alloys. In parallel with this, all samples with higher power density/emissivity have internal oxidation and therefore a “rough” metal–oxide interface. Thus, one cause for the increase of the emissivity of the scale could be this rough metal–oxide interface; other causes could be a higher amount of zirconium incorporated into the scale, more pores and/or different grain structure in the scale. Additionally the carbon content influences the appearance of a higher emissivity and the internal oxidation.

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Section: Appendixmentioning

confidence: 99%

“…Radiation emitted by a system composed of a film (2) deposited on an opaque substrate (3) from ref [21]. …”

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confidence: 99%

Influence of minor additions on the emissivity of the oxide scale of FeCrAlY alloys during resistance heating

Hattendorf¹

2011

Materials & Corrosion

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“…If the material is lossy, we define absorption as A=1−T−R. From Kirchoff's second law, we know that absorptance equals to emittance if the source is a perfect blockbody, independent of the nature of the material [20,21,22]. We can as well extend the theory to 2D and 3D photonic crystals.…”

Section: Introduction Of Absorption and Transmission Calculationsmentioning

confidence: 99%

Absorption and emission properties of photonic crystals and metamaterials

Peng

2007

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“…Mainly two different approaches for emissivity modeling of thin films can be found in literature. One considers the thermal radiation of the substrate material which passes through the film layer (direct method [2] [3]) and the second is based on a reflectance model of the film surface [4]. Our work is based on the latter which assumes the validity of the fundamental equation ε = 1 -ρ (even for thin film systems).…”

Section: Introductionmentioning

confidence: 99%

Optical characterization of growing thin films at high temperatures by analysis of near infrared emissivity variations using CCD thermal imaging

Zauner¹,

Mayrhofer²,

Hendorfer³

2010

Proceedings of the 2010 International Conference on Quantitative InfraRed Thermography

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Due to interference effects which occur during the growth of surface thin films, the resulting spectral emissivity varies continuously. It is shown in this paper, that these temporal variations of emissivity allow the determination of the complex index of refraction (i.e. optical constants n, k) of a thin absorbing film, without explicit knowledge of the optical constants of the substrate layer. In particular, this work presents results obtained by the analysis of the thermal radiation of a thin thermally grown iron-oxide film on a heated steel specimen (at approx. 400°C) measured by a standard CCD camera with a near infrared band-pass filter (~1μm).

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Calculation of thermal emissivity for thin films by a direct method

Cited by 64 publications

References 26 publications

Influence of minor additions on the emissivity of the oxide scale of FeCrAlY alloys during resistance heating

Influence of minor additions on the emissivity of the oxide scale of FeCrAlY alloys during resistance heating

Absorption and emission properties of photonic crystals and metamaterials

Optical characterization of growing thin films at high temperatures by analysis of near infrared emissivity variations using CCD thermal imaging

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