Apparatus for measuring the emittance of materials from far infrared to visible wavelengths in extreme conditions of temperature

Meneses, D. De Sousa; Melin, Philippe; Campo, Leire del; Cosson, Lionel; Echegut, Patrick

doi:10.1016/j.infrared.2015.01.011

Cited by 56 publications

(34 citation statements)

References 18 publications

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“…Furthermore, the low dependence of emissivity platinum with temperature in NIR band has been shown (1.8 to 3.1µm for this work) by Deemyad and Silvera [48]. This statement is also confirmed by CEMHTI [34] in their works on platinum χ point. Under the hypothesis of a constant emissivity with temperature ( ( ) ≈ (20°)), the emissivity of a polished platinum sample is measured at room temperature on a commercial IRTF spectrometer Bruker vertex 70 with the help of an infragold integrating sphere.…”

Section: Please Cite This Article As Doi:101063/15116425supporting

confidence: 86%

“…Platinum spectral emissivity in the NIR range is presented in Figure 14a. Low dependence of spectral emissivity with temperature can be seen which is confirmed by several works ( [34], [48]). Spectral emissivity seems to follow two different trends: up to 1.8µm its value is quasi-constant then a regular decrease is observed afterward.…”

Section: Spectral Emissivity Measurement O Nir Bi Measurementssupporting

confidence: 83%

“…Another device has also been developed recently by CEMHTI [34]. An interesting particularity of this device is that it can be applied to semitransparent materials.…”

Section: Direct Methodsmentioning

confidence: 99%

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A fast and versatile method for spectral emissivity measurement at high temperatures

Bakali

Gilblas

Pottier

et al. 2019

Review of Scientific Instruments

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In this paper, the development of a new device for high temperature emissivity measurement is described. This device aims at measuring both spectral and total emissivity for a thermal range of 600 to 1000°C. The device main targeted properties were both versatility and simplicity. To do so, a rigorous selection was made for each component: heating system, heat source, sample holder, measuring devices. Sample dimensions and the corresponding sample holder were optimized through a ray tracing model computation. Selection of sensors to compute a total emissivity was also especially discussed. A NIR spectrometer, and two MIR cameras covering [3-5] and [7.5-13]µm equipped with optical filters were chosen for spectral measurements. The major impediment was the separation between sample signal and various spurious signals emitted by environment. A specific measurement methodology was then made for each bandwidth to resolve this issue. A reference material was chosen for the device validation: Platinum. Spectral emissivity measurements were then compared to values from a commercial spectrometer. A good agreement was found for NIR and the first MIR band measurements and a higher error was seen in MIR second band which is explained by a less favorable signal to noise ratio. Integrated emissivity is then calculated and compared to values found in the literature. A good agreement between those values is found and similar trends with temperature are observed. The device is then validated for spectral and total emissivity measurement. Device versatility and simplicity allows an easy adaptation to a large area of applications.

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Section: Please Cite This Article As Doi:101063/15116425supporting

confidence: 86%

Section: Spectral Emissivity Measurement O Nir Bi Measurementssupporting

confidence: 83%

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A fast and versatile method for spectral emissivity measurement at high temperatures

Bakali

Gilblas

Pottier

et al. 2019

Review of Scientific Instruments

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“…Indeed, α-SiC open-cell foams behave as semi-transparent media from a macroscopic viewpoint whereas their constitutive struts are in general optically thick at the microscopic scale. 3 This picture means that knowing their radiative properties at elevated temperatures requires firstly to measure their spectral emittances for centimeter-size volumes of measure 5 while homogenized radiative properties (absorption and scattering coefficient, scattering phase function) are necessary for solving heat and mass transport equations 1 for optimizing the thermal efficiency in high temperature systems.…”

mentioning

confidence: 99%

“…Due to prejudicial thermo-oxidation, temperatures above 1300 K 19 were avoided whereas the experimental set-up allows measurement up to extreme temperature∼ 2500 K under air. 5 Briefly, the single crystal was heated with a K500 CO 2 laser from Coherent Inc (Santa Clara, CA, USA) and the emitted flux was compared to the one produced by a PYROX PY8 blackbody furnace (Rambouillet, France). Both fluxes were driven to FTIR spectrometers, a Bruker Vertex 80v operating under primary vacuum a Bruker Vertex 70 purged with dry air.…”

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confidence: 99%

Tuning the spectral emittance of α-SiC open-cell foams up to 1300 K with their macro porosity

et al. 2016

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A simple and robust analytical model is used to finely predict the spectral emittance under air up to 1300 K of α-SiC open-cell foams constituted of optically thick struts. The model integrates both the chemical composition and the macro-porosity and is valid only if foams have volumes higher than their Representative Elementary Volumes required for determining their emittance. Infrared emission spectroscopy carried out on a doped silicon carbide single crystal associated to homemade numerical tools based on 3D meshed images (Monte Carlo Ray Tracing code, foam generator) make possible to understand the exact role of the cell network in emittance. Finally, one can tune the spectral emittance of α-SiC foams up to 1300 K by simply changing their porosity.

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Improving Field Lava Flow Temperatures with Lab-based Spectral Emissivities for The 2014–2015 Holuhraun Eruption.

Biren

Aufaristama

Cosson

et al. 2021

Preprint

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RS vs. Lab-based Thermal Maps RESULTSSpectral emissivity depends on λ and T [7]: ε increases linearly with temperature at 10.9 μm (TIR), and changes non-linearly and with greater amplitude at 1.6 μm (SWIR).When lab-based emissivity maps are compared, derived ε values are higher in SWIR (0.9-1.0) than in TIR(0.8-0.9). High ε values are characteristic of molten lava (e.g., lava channel and levées are well visible) whereas lower ε values are characteristic of the lava flow surroundings (e.g., lava front).When Thermal maps are compared, T distribution varies between RS-and Lab-based thermal maps. Lava channel shows lower temperatures whereas levées and lava front show higher temperatures. The temperatures of the cooled surroundings remain constant.The mean di erence between RS-and lab-based thermal maps is ~50° for lava channel, while is greater for lava levées and lower for cooled surroundings. METHODSpectral emissivity of basaltic magma from the 2014-2015 Holuhraun eruption was measured in situ. Spectra were systematically acquired over a wide spectral range (400-8000 cm −1 ) covering TIR, MIR and SWIR, and up to ~1800 K using IR emission apparatus [4]. Then, we transformed the ε-T relationship into equations at two wavelengths of interest for RS; 10.9 μm (TIR), and 1.6 μm (SWIR). Finally, we implemented these equations in Aufaristama et al. (2018) [5] thermal model and run the refined model as follow: 1-First iteration with constant ε (0.97) to determine T. 2-Creation of emissivity map for each band using T to calculate ε. 3-Second iteration with ε calculate to refine lava flow T.

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Apparatus for measuring the emittance of materials from far infrared to visible wavelengths in extreme conditions of temperature

Cited by 56 publications

References 18 publications

A fast and versatile method for spectral emissivity measurement at high temperatures

A fast and versatile method for spectral emissivity measurement at high temperatures

Tuning the spectral emittance of α-SiC open-cell foams up to 1300 K with their macro porosity

Improving Field Lava Flow Temperatures with Lab-based Spectral Emissivities for The 2014–2015 Holuhraun Eruption.

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