High spectral resolution of overlapping molecular transitions of CH4 and N2O in the mid-infrared region

2017 ◽  
Author(s):  
MH Hlaing ◽  
Seth A. Fair ◽  
Caio Azevedo ◽  
Amir Khan
Keyword(s):  
Spectral Resolution ◽  
Infrared Region ◽  
High Spectral Resolution ◽  
Mid Infrared ◽  
Ch4 And N2o

scholarly journals Time-resolved mid-infrared dual-comb spectroscopy

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Muhammad A. Abbas ◽  
Qing Pan ◽  
Julien Mandon ◽  
Simona M. Cristescu ◽  
Frans J. M. Harren ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Vibrational Excitation ◽  
High Spectral Resolution ◽  
Acquisition Time ◽  
Time Resolved ◽  
Short Acquisition Time ◽  
Mid Infrared ◽  
Infrared Wavelength ◽  
Potential Applications ◽  
Kinetics Of

AbstractDual-comb spectroscopy can provide broad spectral bandwidth and high spectral resolution in a short acquisition time, enabling time-resolved measurements. Specifically, spectroscopy in the mid-infrared wavelength range is of particular interest, since most of the molecules have their strongest rotational-vibrational transitions in this “fingerprint” region. Here we report time-resolved mid-infrared dual-comb spectroscopy, covering ~300 nm bandwidth around 3.3 μm with 6 GHz spectral resolution and 20 μs temporal resolution. As a demonstration, we study a CH4/He gas mixture in an electric discharge, while the discharge is modulated between dark and glow regimes. We simultaneously monitor the production of C2H6 and the vibrational excitation of CH4 molecules, observing the dynamics of both processes. This approach to broadband, high-resolution, and time-resolved mid-infrared spectroscopy provides a new tool for monitoring the kinetics of fast chemical reactions, with potential applications in various fields such as physical chemistry and plasma/combustion analysis.

scholarly journals Hybrid high spectral resolution broadband mid-infrared SFG spectrometer development and demonstration

2021 ◽  
Author(s):  
Karolis Madeikis ◽  
Robertas Kananavicius ◽  
Rokas Danilevicius ◽  
Audrius Zaukevicius ◽  
Januskevicius Regimantas ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Mid Infrared

EXES: The Echelon-cross-echelle Spectrograph for SOFIA

2018 ◽  
Vol 07 (04) ◽  
pp. 1840013 ◽  
Author(s):  
M. J. Richter ◽  
C. N. DeWitt ◽  
M. McKelvey ◽  
E. Montiel ◽  
R. McMurray ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Infrared Astronomy ◽  
High Spectral Resolution ◽  
Echelle Spectrograph ◽  
Mid Infrared ◽  
Low Background ◽  
And Performance ◽  
Operational Modes ◽  
Echelon Grating

The Echelon-cross-echelle spectrograph (EXES) is a high spectral resolution, mid-infrared spectrograph designed for and operated on the Stratospheric Observatory for Infrared Astronomy (SOFIA). EXES has multiple operational modes, but is optimized for high spectral resolution. The heart of the instrument is a one meter long, diamond-machined echelon grating. EXES also uses a 10242 Si:As detector optimized for low-background flux. We will discuss the design, operation and performance of EXES.

scholarly journals Mid-infrared interferometry with high spectral resolution

2010 ◽  
Author(s):  
Edward H. Wishnow ◽  
William Mallard ◽  
Vikram Ravi ◽  
Sean Lockwood ◽  
Walt Fitelson ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
High Spectral Resolution ◽  
Mid Infrared ◽  
Infrared Interferometry

scholarly journals Cloud identification and classification from high spectral resolution data in the far and mid infrared

2019 ◽  
Author(s):  
Tiziano Maestri ◽  
William Cossich ◽  
Iacopo Sbrolli
Keyword(s):  
Spectral Resolution ◽  
Learning Algorithm ◽  
Far Infrared ◽  
Synthetic Dataset ◽  
High Spectral Resolution ◽  
Spectral Radiance ◽  
Electromagnetic Spectrum ◽  
Cloud Detection ◽  
Mid Infrared ◽  
Univariate Distribution

Abstract. A new Cloud Identification and Classification algorithm, named CIC, is presented. CIC is a machine-learning algorithm, based on Principal Component Analysis, able to perform a cloud detection and scene classification using a univariate distribution and a threshold, which serves as a binary classifier. CIC is tested on a widespread synthetic dataset of high spectral resolution radiances in the far and mid infrared part of the spectrum simulating measures from the ESA Earth Explorer Fast Track 9 competing mission FORUM (Far Infrared Outgoing Radiation Understanding and Monitoring) that is currently (2018/19) undergoing the industrial and scientific Phase-A studies. Simulated spectra are representatives of many diverse climatic areas, ranging from the tropical to polar regions. Application of the algorithm to the synthetic dataset provides high scores for clear/cloud identification, especially when optimisation processes are performed. One of the main results consists in pointing out the high information content of spectral radiance in the far-infrared region of the electromagnetic spectrum to identify cloudy scenes specifically thin cirrus clouds.

scholarly journals Instrument concept of the imaging Fourier transform spectrometer GLORIA

2014 ◽  
Vol 7 (3) ◽  
pp. 2301-2337 ◽  
Author(s):  
F. Friedl-Vallon ◽  
T. Gulde ◽  
F. Hase ◽  
A. Kleinert ◽  
T. Kulessa ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Spectral Resolution ◽  
Lower Stratosphere ◽  
Infrared Region ◽  
High Spectral Resolution ◽  
Fourier Transform Spectrometer ◽  
Upper Troposphere ◽  
Very High Spatial Resolution ◽  
Research Aircraft ◽  
Very High

Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is an imaging limb emission sounder operating in the thermal infrared region. It is designed to provide measurements of the Upper Troposphere/Lower Stratosphere with high spatial and high spectral resolution. The instrument consists of an imaging Fourier transform spectrometer integrated in a gimbal. The assembly can be mounted in the belly pod of the German high altitude and long range research aircraft HALO and in instrument bays of the Russian M55 Geophysica. Measurements are made predominantly in two distinct modes: the chemistry mode emphasises chemical analysis with high spectral resolution, the dynamics mode focuses on dynamical processes of the atmosphere with very high spatial resolution. In addition the instrument allows tomographic analyses of air volumes. The first measurement campaigns have shown compliance with key performance and operational requirements.

scholarly journals Investigation of circumstellar shells by mid-infrared heterodyne spectroscopy

1987 ◽  
Vol 122 ◽  
pp. 553-554
Author(s):  
U. Schrey ◽  
S. Drapatz ◽  
H.U. Käufl ◽  
H. Rothermel ◽  
S. K. Ghosh
Keyword(s):  
Penetration Depth ◽  
Spatial Resolution ◽  
Spectral Resolution ◽  
High Spatial Resolution ◽  
High Spectral Resolution ◽  
Mid Infrared ◽  
Heterodyne Spectroscopy ◽  
High Penetration ◽  
Circumstellar Shells

Heterodyne spectroscopy at 11 μm combines high spectral resolution (λ/Δ λ ~106), high spatial resolution (< 1 arcsec at 3 m telescopes) and high penetration depth. Therefore, it seems promising to use it also for the investigation of bright circumstellar atmospheres.

scholarly journals Instrument concept of the imaging Fourier transform spectrometer GLORIA

2014 ◽  
Vol 7 (10) ◽  
pp. 3565-3577 ◽  
Author(s):  
F. Friedl-Vallon ◽  
T. Gulde ◽  
F. Hase ◽  
A. Kleinert ◽  
T. Kulessa ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Spectral Resolution ◽  
Infrared Region ◽  
High Spectral Resolution ◽  
Fourier Transform Spectrometer ◽  
Upper Troposphere ◽  
Very High Spatial Resolution ◽  
Research Aircraft ◽  
Very High ◽  
Made In

Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is an imaging limb emission sounder operating in the thermal infrared region. It is designed to provide measurements of the upper troposphere/lower stratosphere with high spatial and high spectral resolution. The instrument consists of an imaging Fourier transform spectrometer integrated into a gimbal. The assembly can be mounted in the belly pod of the German High Altitude and Long Range research aircraft (HALO) and in instrument bays of the Russian M55 Geophysica. Measurements are made in two distinct modes: the chemistry mode emphasises chemical analysis with high spectral resolution, and the dynamics mode focuses on dynamical processes of the atmosphere with very high spatial resolution. In addition, the instrument allows tomographic analyses of air volumes. The first measurement campaigns have shown compliance with key performance and operational requirements.

scholarly journals Compact meta-spectral image sensor for mobile applications

Nanophotonics ◽  
2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Jaesoong Lee ◽  
Yeonsang Park ◽  
Hyochul Kim ◽  
Young-Zoon Yoon ◽  
Woong Ko ◽  
...  
Keyword(s):  
Spectral Resolution ◽  
Near Infrared ◽  
High Efficiency ◽  
Infrared Region ◽  
Image Sensor ◽  
High Spectral Resolution ◽  
Infrared Range ◽  
Spectral Image ◽  
Multilayer Filters ◽  
Spectral Imager

Abstract We have demonstrated a compact and efficient metasurface-based spectral imager for use in the near-infrared range. The spectral imager was created by fabricating dielectric multilayer filters directly on top of the CMOS image sensor. The transmission wavelength for each spectral channel was selected by embedding a Si nanopost array of appropriate dimensions within the multilayers on the corresponding pixels, and this greatly simplified the fabrication process by avoiding the variation of the multilayer-film thicknesses. The meta-spectral imager shows high efficiency and excellent spectral resolution up to 2.0 nm in the near-infrared region. Using the spectral imager, we were able to measure the broad spectra of LED emission and obtain hyperspectral images from wavelength-mixed images. This approach provides ease of fabrication, miniaturization, low crosstalk, high spectral resolution, and high transmission. Our findings can potentially be used in integrating a compact spectral imager in smartphones for diverse applications.

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