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Characterization an...
Characterization and potential for reducing optical resonances in Fourier transform infrared spectrometers of the Network for the Detection of Atmospheric Composition Change (NDACC)
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- Blumenstock, T. (author)
- Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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- Hase, F. (author)
- Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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Keens, Axel (author)
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Czurlok, Denis (author)
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- Colebatch, Orfeo (author)
- University of Toronto
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- Garcia, O. (author)
- Meteorological State Agency of Spain (AEMET)
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- Griffith, David W.T. (author)
- University of Wollongong
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- Grutter, M. (author)
- Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
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- Hannigan, J. W. (author)
- National Center for Atmospheric Research
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- Heikkinen, Pauli (author)
- Illmatieteen Laitos,Finnish Meteorological Institute (FMI)
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Jeseck, Pascal (author)
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- Jones, N. (author)
- University of Wollongong
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- Kivi, Rigel (author)
- Illmatieteen Laitos,Finnish Meteorological Institute (FMI)
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- Lutsch, Erik (author)
- University of Toronto
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- Makarova, M. V. (author)
- Saint Petersburg State University - Spsu
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- Imhasin, Hamud K. (author)
- Saint Petersburg State University - Spsu
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- Mellqvist, Johan, 1965 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Morino, Isamu (author)
- National Institute for Environmental Studies,National Institute for Environmental Studies of Japan
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- Nagahama, Tomoo (author)
- Nagoya University
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- Notholt, J. (author)
- Universität Bremen
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- Ortega, Ivan (author)
- National Center for Atmospheric Research
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- Palm, Mathias (author)
- Universität Bremen
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- Raffalski, U. (author)
- Institutet for rymdfysik (IRF),The Swedish Institute of Space Physics (IRF)
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- Rettinger, M. (author)
- Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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- Robinson, John (author)
- National Institute of Water and Atmospheric Research (NIWA)
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- Schneider, Matthias (author)
- Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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- Servais, C. (author)
- Universite de Liège,University of Liège
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- Smale, Dan (author)
- National Institute of Water and Atmospheric Research (NIWA)
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- Stremme, W. (author)
- Universidad Nacional Autónoma de México (UNAM),Universidad Nacional Autonoma de Mexico
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- Strong, K. (author)
- University of Toronto
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- Sussmann, R. (author)
- Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
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Té, Yao (author)
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- Velazco, V. (author)
- University of Wollongong
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(creator_code:org_t)
- 2021-02-17
- 2021
- English.
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In: Atmospheric Measurement Techniques. - : Copernicus GmbH. - 1867-1381 .- 1867-8548. ; 14:2, s. 1239-1252
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https://amt.copernic...
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https://doi.org/10.5...
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Abstract
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- Although optical components in Fourier transform infrared (FTIR) spectrometers are preferably wedged, in practice, infrared spectra typically suffer from the effects of optical resonances ("channeling") affecting the retrieval of weakly absorbing gases. This study investigates the level of channeling of each FTIR spectrometer within the Network for the Detection of Atmospheric Composition Change (NDACC). Dedicated spectra were recorded by more than 20 NDACC FTIR spectrometers using a laboratory mid-infrared source and two detectors. In the indium antimonide (InSb) detector domain (1900-5000 cm-1), we found that the amplitude of the most pronounced channeling frequency amounts to 0.1 ‰ to 2.0 ‰ of the spectral background level, with a mean of (0:68±0:48) ‰ and a median of 0.60 ‰. In the mercury cadmium telluride (HgCdTe) detector domain (700-1300 cm-1), we find even stronger effects, with the largest amplitude ranging from 0.3 ‰ to 21 ‰ with a mean of (2:45±4:50) ‰ and a median of 1.2 ‰. For both detectors, the leading channeling frequencies are 0.9 and 0.11 or 0.23 cm-1 in most spectrometers. The observed spectral frequencies of 0.11 and 0.23 cm-1 correspond to the optical thickness of the beam splitter substrate. The 0.9 cm-1 channeling is caused by the air gap in between the beam splitter and compensator plate. Since the air gap is a significant source of channeling and the corresponding amplitude differs strongly between spectrometers, we propose new beam splitters with the wedge of the air gap increased to at least 0.8. We tested the insertion of spacers in a beam splitter's air gap to demonstrate that increasing the wedge of the air gap decreases the 0.9 cm-1 channeling amplitude significantly. A wedge of the air gap of 0.8 reduces the channeling amplitude by about 50 %, while a wedge of about 2 removes the 0.9 cm-1 channeling completely. This study shows the potential for reducing channeling in the FTIR spectrometers operated by the NDACC, thereby increasing the quality of recorded spectra across the network.
Subject headings
- NATURVETENSKAP -- Fysik -- Acceleratorfysik och instrumentering (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Accelerator Physics and Instrumentation (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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To the university's database
- By the author/editor
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Blumenstock, T.
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Hase, F.
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Keens, Axel
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Czurlok, Denis
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Colebatch, Orfeo
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Garcia, O.
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show more...
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Griffith, David ...
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Grutter, M.
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Hannigan, J. W.
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Heikkinen, Pauli
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Jeseck, Pascal
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Jones, N.
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Kivi, Rigel
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Lutsch, Erik
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Makarova, M. V.
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Imhasin, Hamud K ...
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Mellqvist, Johan ...
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Morino, Isamu
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Nagahama, Tomoo
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Notholt, J.
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Ortega, Ivan
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Palm, Mathias
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Raffalski, U.
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Rettinger, M.
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Robinson, John
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Schneider, Matth ...
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Servais, C.
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Smale, Dan
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Stremme, W.
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Strong, K.
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Sussmann, R.
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Té, Yao
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Velazco, V.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Accelerator Phys ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- ENGINEERING AND TECHNOLOGY
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ENGINEERING AND ...
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and Electrical Engin ...
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and Signal Processin ...
- Articles in the publication
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Atmospheric Meas ...
- By the university
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Chalmers University of Technology