Accurate modeling of optical system aberrations applied to the design of a stationary Fourier transform spectroradiometer

2005 ◽  
Author(s):  
Hervé Sauer ◽  
Yann Ferrec ◽  
Catherine Armellin ◽  
Jean Taboury ◽  
Patricia Cymbalista ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Optical System

Balloon-borne GLORIA hyperspectral Limb and Nadir imager in the LWIR

2021 ◽  
Author(s):  
Erik Kretschmer ◽  
Felix Friedl-Vallon ◽  
Thomas Gulde ◽  
Michael Höpfner ◽  
Sören Johansson ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Optical System ◽  
Late Summer ◽  
High Spectral Resolution ◽  
Fourier Transform Spectrometer ◽  
System Improvement ◽  
The Fourier Transform ◽  
Temperature Retrieval ◽  
Long Wave Infrared ◽  
Better Than

<p>The GLORIA-B (Gimballed Limb Observer for Radiance Imaging of the Atmosphere - Balloon) instrument is an adaptation of the very successful GLORIA-AB imaging Fourier transform spectrometer (iFTS) flown on the research aircrafts HALO and M55 Geophysica. The high spectral resolution in the LWIR (Long Wave Infrared) allows for the retrieval of temperature and of a broad range of atmospheric trace gases, with the goal to retrieve O<sub>3</sub>, H<sub>2</sub>O, HNO<sub>3</sub>, C<sub>2</sub>H<sub>6</sub>, C<sub>2</sub>H<sub>2</sub>, HCOOH, CCl<sub>4</sub>, PAN, ClONO<sub>2</sub>, CFC-11, CFC-12, SF<sub>6</sub>, OCS, NH<sub>3</sub>, HCN, BrONO<sub>2</sub>, HO<sub>2</sub>NO<sub>2</sub>, N<sub>2</sub>O<sub>5</sub> and NO<sub>2</sub>. The radiometric sensitivity of the Balloon instrument is further increased in comparison with the GLORIA-AB instrument by having two detector channels on the same focal plane array, while keeping the same concept of a cooled optical system. This system improvement was achieved with minimal adaptation of the existing optical system.</p><p>The high spatial and temporal resolution of the instrument is ensured by the imaging capability of the Fourier transform spectrometer while stabilizing the line-of-sight in elevation with the instrument and in azimuth with the balloon gondola. In a single measurement lasting 13 seconds, the atmosphere can be sounded from mid-troposphere up to flight altitude, typically 30 km, with a vertical resolution always better than 1 km for most retrieved species; a spatial resolution up to 0.3 km can be achieved in favourable conditions. Temperature retrieval precision between 0.1 and 0.2 K is expected. A spectral sampling up to 0.0625 cm<sup>-1</sup> can be achieved.</p><p>The first flight of GLORIA-B shall take place during the late-summer polar jet turn-around at Kiruna/ESRANGE. This flight is organised in the frame of the HEMERA project and was scheduled for summer 2020, but was ultimately postponed to summer 2021. Beyond qualification of the first balloon-borne iFTS, the scientific goals of the flight are, among others, the quantification of the stratospheric bromine budget and its diurnal evolution by measuring vertical profiles of BrONO<sub>2 </sub>in combination with BrO observations by the DOAS instrument of University Heidelberg on the same platform.</p>

Fast calculation method for viewpoint movements in computer-generated holograms using a Fourier transform optical system

2019 ◽  
Vol 58 (34) ◽  
pp. G71
Author(s):  
Ryosuke Watanabe ◽  
Takamasa Nakamura ◽  
Masaya Mitobe ◽  
Yuji Sakamoto ◽  
Sei Naito
Keyword(s):  
Fourier Transform ◽  
Optical System ◽  
Calculation Method ◽  
Fast Calculation ◽  
Computer Generated Holograms

Spatially Encoded Fourier Transform Spectroscopy in the Ultraviolet to Near-Infrared

1989 ◽  
Vol 43 (8) ◽  
pp. 1378-1384 ◽  
Author(s):  
Jonathan V. Sweedler ◽  
M. Bonner Denton
Keyword(s):  
Fourier Transform ◽  
Optical System ◽  
Near Infrared ◽  
Dynamic Range ◽  
Wavelength Region ◽  
Atomic Emission ◽  
Fourier Transform Spectroscopy ◽  
Common Path ◽  
Linear Ccd ◽  
Absorbance Spectra

A spatial (Sagnac triangular common path) interferometer is described and evaluated for obtaining spectra in the 200–950 nm wavelength region. The interferometer has no moving parts, requires no entrance or exit slits, and is easy to align. A linear CCD is employed as the detector, allowing spectra to be simultaneously acquired. The performance of the interferometer is demonstrated for atomic emission and solution absorbance spectra. A method to remove the fixed-pattern response of the detector and optical system is demonstrated which effectively increases the dynamic range of the resulting spectra.

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