Characterization of transmittance, reflectance, and optical scattering of high-performance interference filters in the visible and near-infrared spectral regions

2019 ◽  
Author(s):  
M. Zerrad ◽  
M. Lequime ◽  
C. Amra
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Optical Scattering ◽  
Interference Filters ◽  
Infrared Spectral

scholarly journals Characterization of interferences to in situ observations of <i>δ</i><sup>13</sup>CH<sub>4</sub> and C<sub>2</sub>H<sub>6</sub> when using a cavity ring-down spectrometer at industrial sites

2017 ◽  
Vol 10 (6) ◽  
pp. 2077-2091 ◽  
Author(s):  
Sabina Assan ◽  
Alexia Baudic ◽  
Ali Guemri ◽  
Philippe Ciais ◽  
Valerie Gros ◽  
...  
Keyword(s):  
Near Infrared ◽  
Field Tests ◽  
Isotopic Signature ◽  
Ambient Conditions ◽  
Industrial Sites ◽  
Source Determination ◽  
Infrared Spectral ◽  
The Subject

Abstract. Due to increased demand for an understanding of CH4 emissions from industrial sites, the subject of cross sensitivities caused by absorption from multiple gases on δ13CH4 and C2H6 measured in the near-infrared spectral domain using CRDS has become increasingly important. Extensive laboratory tests are presented here, which characterize these cross sensitivities and propose corrections for the biases they induce. We found methane isotopic measurements to be subject to interference from elevated C2H6 concentrations resulting in heavier δ13CH4 by +23.5 ‰ per ppm C2H6 ∕ ppm CH4. Measured C2H6 is subject to absorption interference from a number of other trace gases, predominantly H2O (with an average linear sensitivity of 0.9 ppm C2H6 per  % H2O in ambient conditions). Yet, this sensitivity was found to be discontinuous with a strong hysteresis effect and we suggest removing H2O from gas samples prior to analysis. The C2H6 calibration factor was calculated using a GC and measured as 0.5 (confirmed up to 5 ppm C2H6). Field tests at a natural gas compressor station demonstrated that the presence of C2H6 in gas emissions at an average level of 0.3 ppm shifted the isotopic signature by 2.5 ‰, whilst after calibration we find that the average C2H6 : CH4 ratio shifts by +0.06. These results indicate that, when using such a CRDS instrument in conditions of elevated C2H6 for CH4 source determination, it is imperative to account for the biases discussed within this study.

Characterization of the Ryugu surface by means of the variability of the near-infrared spectral slope in NIRS3 data

Icarus ◽  
2020 ◽  
Vol 351 ◽  
pp. 113959
Author(s):  
A. Galiano ◽  
E. Palomba ◽  
M. D'Amore ◽  
A. Zinzi ◽  
F. Dirri ◽  
...  
Keyword(s):  
Near Infrared ◽  
Spectral Slope ◽  
Infrared Spectral

scholarly journals SERS Characterization of the Indocyanine-Type Dye IR-820 on Gold and Silver Nanoparticles in the Near Infrared

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Tatiana B. V. Neves ◽  
Gustavo F. S. Andrade
Keyword(s):  
Gold Nanoparticles ◽  
Silver Nanoparticles ◽  
Raman Spectrum ◽  
High Performance ◽  
Near Infrared ◽  
Cyanine Dyes ◽  
Metallic Surface ◽  
Gold And Silver Nanoparticles ◽  
Biological Compatibility

The Raman spectrum of the indocyanine-type dye IR-820 has been assigned for both solid and solution. SERS spectra of IR-820 on both silver and gold nanoparticles suspensions excited at 1064 nm were obtained. AgNPs allowed the detection of the dye through SERS down to 0.1 micromoles per liter; for the AuNPs the lowest concentration of the dye detectable was 10 micromoles per liter. Changes in the SERS relative intensities compared to the Raman spectrum in solution are subtle, mostly due to the preresonance effect of the dye. However, a perpendicular orientation relative to the metallic surface was inferred for the dye on both AgNPs and AuNPs. The easily distinguishable SERS spectra of the dye excited at 1064 nm, together with the high biological compatibility of cyanine dyes, are both indicative that IR-820 could be used as a high-performance probe molecule for SERS.

Effect of Morphology on Spectral Radiative Properties of Three-Dimensionally Ordered Macroporous Ceria Packed Bed

2013 ◽  
Vol 135 (12) ◽  
Author(s):  
Krithiga Ganesan ◽  
Jaona Randrianalisoa ◽  
Wojciech Lipiński
Keyword(s):  
Spectral Range ◽  
Near Infrared ◽  
Packed Bed ◽  
Radiative Properties ◽  
Before And After ◽  
Infrared Spectral ◽  
Thermochemical Processes ◽  
Path Lengths ◽  
Ordered Macroporous

In this paper, radiative characterization of a packed bed of novel three-dimensionally ordered macroporous (3DOM) ceria particles is performed in the spectral range relevant to solar thermochemical processes, 0.35–2.2 μm. Normal–hemispherical transmittance and reflectance of three samples of various thicknesses are measured. Monte Carlo ray-tracing (MCRT) and discrete ordinate methods are employed to identify transport scattering albedo and transport extinction coefficient in the spectral range corresponding to weak absorption in the semi-transparency band of ceria. 3DOM ceria particles are characterized by weaker scattering in comparison to sintered ceria ceramics, and increased transparency in the near-infrared spectral range 0.7–2 μm. The ordered pore-morphology of the 3DOM ceria after thermochemical redox cycling between temperatures 1373 K and 1073 K is altered due to sintering of walls of the 3DOM structure. The absorption coefficient of the packed bed is found to be practically independent of morphology. Radiative characterization of 3DOM ceria ceramics before and after thermochemical cycling suggests that preserving the 3DOM structure can lead to scattering characteristics that permit longer attenuation path lengths of incident concentrated solar radiation in the material, as well as be favorable for confinement of the near-infrared radiation during thermochemical cycling leading to favorable thermochemical conditions for fuel production.

scholarly journals Photoluminescence and electroluminescence characterization of high-performance near-infrared emitters based on 1,5-naphthyridin-4-ol-containing heteroleptic platinum(ii) complexes

2021 ◽  
Author(s):  
Hagos Tesfay Kidanu ◽  
Jian Haur Lee ◽  
Chin-Ti Chen
Keyword(s):  
High Performance ◽  
Near Infrared ◽  
Platinum Complexes ◽  
Infrared Emitters

Four 1,5-naphthyridin-4-ol-containing platinum complexes, AtFOND, AtFNND, PBSOND, and PBSNND, have been synthesized and characterized for their photoluminescence (PL) and electroluminescence (EL) properties.

scholarly journals Near-infrared Spectral Characterization of Solar-type Stars in the Northern Hemisphere

2020 ◽  
Vol 160 (3) ◽  
pp. 130
Author(s):  
Collin D. Lewin ◽  
Ellen S. Howell ◽  
Ronald J. Vervack ◽  
Yanga R. Fernández ◽  
Christopher Magri ◽  
...  
Keyword(s):  
Northern Hemisphere ◽  
Near Infrared ◽  
Spectral Characterization ◽  
Infrared Spectral ◽  
Solar Type

Oil and Fat Classification by Selected Bands of Near-Infrared Spectroscopy

2000 ◽  
Vol 54 (8) ◽  
pp. 1168-1174 ◽  
Author(s):  
Pierre Hourant ◽  
Vincent Baeten ◽  
Maria T. Morales ◽  
Marc Meurens ◽  
Ramon Aparicio
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
High Performance ◽  
Near Infrared ◽  
Discriminant Functions ◽  
Linear Discriminant ◽  
High Oleic ◽  
Infrared Spectral ◽  
Filter Type ◽  
Different Sources

One hundred and four edible oil and fat samples from 18 different sources, either vegetable (Brazil nut, coconut, corn, sunflower, walnut, virgin olive, peanut, palm, canola, soybean, sunflower) or animal (tallow and hydrogenated fish), have been analyzed by high-performance gas chromatography (HPGC) and near-infrared spectroscopy (NIRS). Fatty acids were quantified by HPGC. The near-infrared spectral features of the most noteworthy bands were studied and discussed to design a filter-type NIR instrument. An arborescent structure, based on stepwise linear discriminant analysis (SLDA), was built to classify the samples according to their sources. Seven discriminant functions permitted a successive discrimination of saturated fats, corn, soybean, sunflower, canola, peanut, high oleic sunflower, and virgin olive oils. The discriminant functions were based on the absorbance values, between three and five, from the 1700–1800 and 2100–2400 nm regions. Chemical explanations are given in support of the selected wavelengths. The arborescent structure was then checked with a test set, and 90% of the samples were correctly classified.

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