A 90-102 GHz CMOS based pulsed Fourier transform spectrometer: New approaches for in situ chemical detection and millimeter-wave cavity-based molecular spectroscopy

2018 ◽  
Vol 89 (7) ◽  
pp. 073109 ◽  
Author(s):  
Deacon J. Nemchick ◽  
Brian J. Drouin ◽  
Matthew J. Cich ◽  
Timothy Crawford ◽  
Adrian J. Tang ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Millimeter Wave ◽  
Molecular Spectroscopy ◽  
Chemical Detection ◽  
Fourier Transform Spectrometer ◽  
New Approaches

scholarly journals Level 2 processing for the imaging Fourier transform spectrometer GLORIA: derivation and validation of temperature and trace gas volume mixing ratios from calibrated dynamics mode spectra

2015 ◽  
Vol 8 (6) ◽  
pp. 2473-2489 ◽  
Author(s):  
J. Ungermann ◽  
J. Blank ◽  
M. Dick ◽  
A. Ebersoldt ◽  
F. Friedl-Vallon ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Horizontal Resolution ◽  
Trace Gas ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
Ionization Mass ◽  
Fourier Transform Spectrometer ◽  
Upper Troposphere ◽  
Mixing Ratios

Abstract. The Gimballed Limb Observer for Radiance Imaging of the Atmosphere (GLORIA) is an airborne infrared limb imager combining a two-dimensional infrared detector with a Fourier transform spectrometer. It was operated aboard the new German Gulfstream G550 High Altitude LOng Range (HALO) research aircraft during the Transport And Composition in the upper Troposphere/lowermost Stratosphere (TACTS) and Earth System Model Validation (ESMVAL) campaigns in summer 2012. This paper describes the retrieval of temperature and trace gas (H2O, O3, HNO3) volume mixing ratios from GLORIA dynamics mode spectra that are spectrally sampled every 0.625 cm−1. A total of 26 integrated spectral windows are employed in a joint fit to retrieve seven targets using consecutively a fast and an accurate tabulated radiative transfer model. Typical diagnostic quantities are provided including effects of uncertainties in the calibration and horizontal resolution along the line of sight. Simultaneous in situ observations by the Basic Halo Measurement and Sensor System (BAHAMAS), the Fast In-situ Stratospheric Hygrometer (FISH), an ozone detector named Fairo, and the Atmospheric chemical Ionization Mass Spectrometer (AIMS) allow a validation of retrieved values for three flights in the upper troposphere/lowermost stratosphere region spanning polar and sub-tropical latitudes. A high correlation is achieved between the remote sensing and the in situ trace gas data, and discrepancies can to a large extent be attributed to differences in the probed air masses caused by different sampling characteristics of the instruments. This 1-D processing of GLORIA dynamics mode spectra provides the basis for future tomographic inversions from circular and linear flight paths to better understand selected dynamical processes of the upper troposphere and lowermost stratosphere.

scholarly journals An On-Chip Superconducting Kinetic Inductance Fourier Transform Spectrometer for Millimeter-Wave Astronomy

2020 ◽  
Vol 199 (3-4) ◽  
pp. 867-874
Author(s):  
F. B. Faramarzi ◽  
P. Mauskopf ◽  
S. Gordon ◽  
G. Che ◽  
P. Day ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Millimeter Wave ◽  
Kinetic Inductance ◽  
Fourier Transform Spectrometer ◽  
On Chip

scholarly journals Vertical Distribution of Arctic Methane in 2009–2018 Using Ground-Based Remote Sensing

2020 ◽  
Vol 12 (6) ◽  
pp. 917
Author(s):  
Tomi Karppinen ◽  
Otto Lamminpää ◽  
Simo Tukiainen ◽  
Rigel Kivi ◽  
Pauli Heikkinen ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Vertical Distribution ◽  
Atmospheric Chemistry ◽  
Polar Vortex ◽  
The Arctic ◽  
Fourier Transform Spectrometer ◽  
Atmospheric Methane ◽  
The Vertical Distribution ◽  
Chemistry Experiment

We analyzed the vertical distribution of atmospheric methane (CH 4 ) retrieved from measurements by ground-based Fourier Transform Spectrometer (FTS) instrument in Sodankylä, Northern Finland. The retrieved dataset covers 2009–2018. We used a dimension reduction retrieval method to extract the profile information, since each measurement contains around three pieces of information about the profile shape between 0 and 40 km. We compared the retrieved profiles against Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) satellite measurements and AirCore balloon-borne profile measurements. Additional comparison at the lowest tropospheric layer was done against in-situ measurements from a 50-m-high mast. In general, the ground-based FTS and ACE-FTS profiles agreed within 10% below 20 km and within 30% in the stratosphere between 20 and 40 km. Our method was able to accurately capture reduced methane concentrations inside the polar vortex in the Arctic stratosphere. The method produced similar trend characteristics as the reference instruments even when a static prior profile was used. Finally, we analyzed the time series of the CH 4 profile datasets and estimated the trend using the dynamic linear model (DLM).

Compact liquid crystal waveguide based Fourier transform spectrometer for in-situ and remote gas and chemical sensing

2008 ◽  
Author(s):  
Tien-Hsin Chao ◽  
Thomas T. Lu ◽  
Scott R. Davis ◽  
Scott D. Rommel ◽  
George Farca ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Liquid Crystal ◽  
Chemical Sensing ◽  
Fourier Transform Spectrometer
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