Infrared Emissivity Measurements of Building and Civil Engineering Materials: A New Device for Measuring Emissivity

Monchau, Jean-Pierre; Marchetti, M.; Ibos, Laurent; Dumoulin, Jean; Feuillet, Vincent; Candau, Yves

doi:10.1007/s10765-013-1442-y

Cited by 20 publications

(7 citation statements)

References 13 publications

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“…One-and two-lid variants of the emissivity box method, used to determine the LWIR broadband emissivity of a surface [33][34][35][36][37][38][39] Portable FTIR Spectrometer Approach Use of field-portable Fourier Transform Infrared (FTIR) spectrometer to estimate LWIR surface spectral emissivity [31,32,40,41] Temperature and Emissivity (TES) retrieval algorithm applied to a multi-band radiometer Application of the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Temperature and Emissivity Separation (TES) algorithm with in situ radiance measurements obtained using multi-band radiometers [42,43] Novel Emissiometer Novel instrument combining an oscillating TIR radiance source with digital signal processing to determine the band-effective emissivity of a radiometer [12,44] Sun Shadow Method Similar approach to day/night LST retrieval algorithm adapted to in situ measurements in sun and sun-shadow with spectroradiometer to derive spectral emissivities [45,46] Remote Sens. 2020, 12, 4127 4 of 30…”

Section: Emissivity Box Methodsmentioning

confidence: 99%

Inter-Comparison of Field- and Laboratory-Derived Surface Emissivities of Natural and Manmade Materials in Support of Land Surface Temperature (LST) Remote Sensing

et al. 2020

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Correct specification of a target’s longwave infrared (LWIR) surface emissivity has been identified as one of the greatest sources of uncertainty in the remote sensing of land surface temperature (LST). Field and laboratory emissivity measurements are essential for improving and validating LST retrievals, but there are differing approaches to making such measurements and the conditions that they are made under can affect their performance. To better understand these impacts we made measurements of fourteen manmade and natural samples under different environmental conditions, both in situ and in the laboratory. We used Fourier transform infrared (FTIR) spectrometers to deliver spectral emissivities and an emissivity box to deliver broadband emissivities. Field- and laboratory-measured spectral emissivities were generally within 1–2% in the key 8–12 micron region of the LWIR atmospheric window for most samples, though greater variability was observed for vegetation and inhomogeneous samples. Differences between laboratory and field spectral measurements highlighted the importance of field methods for these samples, with the laboratory setup unable to capture sample structure or inhomogeneity. The emissivity box delivered broadband emissivities with a consistent negative bias compared to the FTIR-based approaches, with differences of up to 5%. The emissivities retrieved using the different approaches result in LST retrieval differences of between 1 and 4 °C, stressing the importance of correct emissivity specification.

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Section: Emissivity Box Methodsmentioning

confidence: 99%

Inter-Comparison of Field- and Laboratory-Derived Surface Emissivities of Natural and Manmade Materials in Support of Land Surface Temperature (LST) Remote Sensing

et al. 2020

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“…Therefore, owing to the colour influence on the emissivity value, most of the thermal cameras used are within the wavelength range of 8-14 mm. Although the emissivity of selected materials can be found in specialized literature, these values are only tentative for most of them (Monchau et al, 2014). In thermographic practice, two comparative methods are used to determine the emissivity value.…”

Section: Current Methods Of Determining Surface Emissivity Valuementioning

confidence: 99%

Infrared thermographic measurement of the surface temperature and emissivity of glossy materials

Alexa

Solař

Čmiel

et al. 2017

Journal of Building Physics

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Determination of the surface temperature and emissivity of glossy materials is a complicated task due to the relatively wide range of emissivity values and the reflection of infrared radiation from surrounding objects. As a consequence, standard methods used in infrared thermography are not applicable. In this article, an alternative method is proposed for the measurement of the surface temperature and emissivity of glossy materials used in the external structures of buildings that is based on an external source of thermal radiation. It is shown that the method gives quite accurate values of emissivity of both low-and high-emissivity glossy materials, whereas the surface temperature of low-emissivity glossy materials is less accurate and strongly depends on the accuracy of the used thermal camera.

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“…These methods assume that the evolution of the emissivity between nearby wavelengths is constant or known. In addition to radiance measurements, the evaluation of the directional hemispherical reflectivity 6 was introduced to deduce both emissivity and temperature [7][8][9][10] . The adjustment of these methods for matricial sensors is still an ongoing endeavour.…”

Section: Active Thermo-reflectometry For Absolute Temperature Measure...mentioning

confidence: 99%

Active thermo-reflectometry for absolute temperature measurement by infrared thermography on specular materials

Lafargue-Tallet

Vaucelle²,

Caliot

et al. 2022

Sci Rep

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Knowledge of material emissivity maps and their true temperatures is of great interest for contactless process monitoring and control with infrared cameras when strong heat transfer and temperature change are involved. This approach is always followed by emissivity or reflections issues. In this work, we describe the development of a contactless infrared imaging technique based on the pyro-reflectometry approach and a specular model of the material reflection in order to overcome emissivities and reflections problems. This approach enables in situ and real-time identification of emissivity fields and autocalibration of the radiative intensity leaving the sample by using a black body equivalent ratio. This is done to obtain the absolute temperature field of any specular material using the infrared wavelength. The presented set up works for both camera and pyrometer regardless of the spectral range. The proposed method is evaluated at room temperature with several heterogeneous samples covering a large range of emissivity values. From these emissivity fields, raw and heterogeneous measured radiative fluxes are transformed into complete absolute temperature fields.

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Infrared Emissivity Measurements of Building and Civil Engineering Materials: A New Device for Measuring Emissivity

Cited by 20 publications

References 13 publications

Inter-Comparison of Field- and Laboratory-Derived Surface Emissivities of Natural and Manmade Materials in Support of Land Surface Temperature (LST) Remote Sensing

Inter-Comparison of Field- and Laboratory-Derived Surface Emissivities of Natural and Manmade Materials in Support of Land Surface Temperature (LST) Remote Sensing

Infrared thermographic measurement of the surface temperature and emissivity of glossy materials

Active thermo-reflectometry for absolute temperature measurement by infrared thermography on specular materials

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