New experimental device for infrared spectral directional emissivity measurements in a controlled environment

2006 ◽  
Vol 77 (11) ◽  
pp. 113111 ◽  
Author(s):  
Leire del Campo ◽  
Raúl B. Pérez-Sáez ◽  
Xabier Esquisabel ◽  
Ignacio Fernández ◽  
Manuel J. Tello
Keyword(s):  
Experimental Device ◽  
Controlled Environment ◽  
Infrared Spectral ◽  
Directional Emissivity ◽  
Emissivity Measurements

scholarly journals High accuracy infrared emissivity between 50 and 1000 ᵒC for solar materials characterization

2020 ◽  
Vol 307 ◽  
pp. 01043
Author(s):  
Raquel Fuente ◽  
Telmo Echániz ◽  
Iñigo González de Arrieta ◽  
Irene Urcelay-Olabarria ◽  
Josu M Igartua ◽  
...  
Keyword(s):  
Basque Country ◽  
Temperature Stability ◽  
Spectral Emissivity ◽  
High Temperature Stability ◽  
Working Temperature ◽  
Material Efficiency ◽  
Solar Thermal Collector ◽  
Infrared Spectral ◽  
Materials Used ◽  
Emissivity Measurements

The total hemispherical emissivity of materials used in the solar energy industry is a critical parameter in the calculation of the radiative thermal losses and material efficiency, especially in solar thermal collector absorbing surfaces. This is because the radiative heat losses have a significant economic impact on the final cost of the electricity produced in solar plants. Our laboratory, HAIRL, in the University of the Basque Country (UPV/EHU) in Spain [1] is the first to have published infrared spectral emissivity measurements in Solar Absorber Surfaces (SAS) at working temperature [2]. The laboratory allows measuring between 50 and 1000 ºC in the 0.83-25 μm range and is also capable of doing directional measurements at different angles between 0 and 80 degrees. Therefore, it is suitable for measuring solar selective coatings, for studying high temperature stability and for characterizing thermal energy harvesting materials. In this presentation, we show the specifications of our laboratory, the results of spectral emissivity measurements in air-resistant solar selective coatings and in eutectic alloys for thermal storage and we demonstrate the necessity of measuring at working temperature in order to possess reliable data.

scholarly journals c-Si PV cells emissivity characterization at low operating temperatures for efficiency management

2020 ◽  
Vol 307 ◽  
pp. 01044
Author(s):  
Raquel Fuente ◽  
Telmo Echániz ◽  
Iñigo González de Arrieta ◽  
Irene Urcelay-Olabarria ◽  
Manuel J. Tello ◽  
...  
Keyword(s):  
Solar Cell ◽  
Basque Country ◽  
Radiative Properties ◽  
Passive Cooling ◽  
Infrared Emissivity ◽  
Thermal Radiative Properties ◽  
Si Solar Cells ◽  
Directional Emissivity ◽  
The University ◽  
Emissivity Measurements

Efficiency is a critical parameter for a solar cell to be successful and is closely related to the working temperature of the cell. In turn, the temperature can be related to the infrared emissivity, the parameter that governs the thermal radiative properties of a body. In particular, the importance of infrared emissivity in a solar cell is essential in passive cooling applications, where controlled radiative thermal losses could let the cell operate at lower temperatures, the range where they present higher efficiency. In this presentation, the emissivity of c-Si solar cells in the low temperature range (around 50 ºC) is discussed. Traditionally, it has been determined by indirect reflectivity measurements at ambient temperature and extrapolated to working temperatures, but here, a direct measurement is proposed. For an accurate value the measurements are performed in the high accuracy radiometer of the University of the Basque Country, which allows spectral directional emissivity measurements as a function of temperature.

New experimental device for high-temperature normal spectral emissivity measurements of coatings

2014 ◽  
Vol 25 (9) ◽  
pp. 095501 ◽  
Author(s):  
Petra Honnerová ◽  
Jiří Martan ◽  
Martin Kučera ◽  
Milan Honner ◽  
Jacques Hameury
Keyword(s):  
High Temperature ◽  
Spectral Emissivity ◽  
Experimental Device ◽  
Normal Spectral Emissivity ◽  
Emissivity Measurements

scholarly journals Evaluation of Six Directional Canopy Emissivity Models in the Thermal Infrared Using Emissivity Measurements

2019 ◽  
Vol 11 (24) ◽  
pp. 3011
Author(s):  
Lluís Pérez-Planells ◽  
Enric Valor ◽  
Raquel Niclòs ◽  
César Coll ◽  
Jesús Puchades ◽  
...  
Keyword(s):  
Land Surface ◽  
Thermal Infrared ◽  
Organic Soil ◽  
Area Index ◽  
Directional Emissivity ◽  
Reference Measurements ◽  
Emissivity Measurements ◽  
Single Set ◽  
Different Soils

Land surface temperature (LST) is a fundamental physical quantity in a range of different studies, for example in climatological analyses and surface–atmosphere heat flux assessments, especially in heterogeneous and complex surfaces such as vegetated canopies. To obtain accurate LST values, it is important to measure accurately the land surface emissivity (LSE) in the thermal infrared spectrum. In the past decades, different directional emissivity canopy models have been proposed. This paper evaluates six radiative transfer models (FR97, Mod3, Rmod3, 4SAIL, REN15, and CE-P models) through a comparison with in situ emissivity measurements performed using the temperature-emissivity separation (TES) method. The evaluation is done using a single set of rose plants over two different soils with very different spectral behavior. First, using an organic soil, the measurements were done for seven different observation angles, from 0° to 60° in steps of 10°, and for six different values of leaf area index (LAI). Taking into account all LAIs, the bias (and root mean square error, RMSE) obtained were 0.003 (±0.006), −0.004 (±0.005), −0.009 (±0.011), 0.005 (±0.007), 0.004 (±0.007), and 0.005 (±0.007) for FR97, Mod3, Rmod3, 4SAIL, REN 15, and CE-P models, respectively. Second, using an inorganic soil, the measurements were done for six different LAIs but for two different observation angles: 0° and 55°. The bias (and RMSE) obtained were 0.012 (±0.014), 0.004 (±0.007), −0.020 (±0.035), 0.016 (±0.017), 0.013 (±0.015), 0.013 (±0.015) and for FR97, Mod3, Rmod3, 4SAIL, REN15, and CE-P models, respectively. Overall, the Mod3 model appears as the best model in comparison to the TES emissivity reference measurements.

FR-IR Molecular Microanalysis System

1990 ◽  
Vol 48 (2) ◽  
pp. 270-271
Author(s):  
John A. Reffner ◽  
William T. Wihlborg
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Integrated System ◽  
Morphological Examination ◽  
Fully Integrated ◽  
Ir Microscopy ◽  
Normal Functions ◽  
Infrared Microspectroscopy ◽  
Infrared Spectral ◽  
Ft Ir

The IRμs™ is the first fully integrated system for Fourier transform infrared (FT-IR) microscopy. FT-IR microscopy combines light microscopy for morphological examination with infrared spectroscopy for chemical identification of microscopic samples or domains. Because the IRμs system is a new tool for molecular microanalysis, its optical, mechanical and system design are described to illustrate the state of development of molecular microanalysis. Applications of infrared microspectroscopy are reviewed by Messerschmidt and Harthcock.Infrared spectral analysis of microscopic samples is not a new idea, it dates back to 1949, with the first commercial instrument being offered by Perkin-Elmer Co. Inc. in 1953. These early efforts showed promise but failed the test of practically. It was not until the advances in computer science were applied did infrared microspectroscopy emerge as a useful technique. Microscopes designed as accessories for Fourier transform infrared spectrometers have been commercially available since 1983. These accessory microscopes provide the best means for analytical spectroscopists to analyze microscopic samples, while not interfering with the FT-IR spectrometer’s normal functions.

Sign in / Sign up

Export Citation Format

Share Document