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Proceedings Paper • Open Access

Compact high-resolution echelle-AOTF NIR spectrometer for atmospheric measurements
Author(s): Oleg I. Korablev; Jean-Loup Bertaux; Imant I. Vinogradov; Yurii K. Kalinnikov; D. Nevejans; E. Neefs; T. Le Barbu; G. Durry

Paper Abstract

A new concept of a high-resolution near-IR spectrometer consisting of an echelle grating combined with an acousto-optic tunable filter (AOTF) for separation of diffraction orders, is developed for space-borne studies of planetary atmospheres. A compact design with no moving parts within the mass budget of 3-5 kg allows to reach the resolving power λ/∆λ of 20000-30000. Only a small piece of spectrum in high diffraction orders can be measured at a time, but thanks to flexibility of the AOTF electrical tuning, such pieces of spectrum can be measured randomly and rapidly within the spectral range. This development can be used for accurate measurements of important atmospheric gases, such as CO2 in terrestrial atmosphere, isotopic ratios and minor gases. A spectrometer, based on this principle, SOIR (Solar Occultation InfraRed) is being built for Venus Express (2005) ESA mission. Instruments based on this principle have high potential for the studies of the Earth, in particular for measurements of isotopes of water in the lower atmosphere, either in solar occultation profiling (tangent altitude <10 km), or observing solar glint for integral quantities of the components. Small size of hardware makes them ideal for micro-satellites, which are now agile enough to provide necessary pointing for solar occultation or glint observations. Also, the atmosphere of Mars has never been observed at local scales with such a high spectral resolution. A laboratory prototype consisting of 275-mm echelle spectrometer with Hamamatsu InGaAs 512-pixel linear array and the AOTF has demonstrated λ/∆λ≈30000 in the spectral range of 1-1.7 μm. The next set up, covering the spectral ranges of 1-1.7 μm and 2.3-4.3 μm, and the Venus Express SOIR are briefly discussed.

Paper Details

Date Published: 21 November 2017
PDF: 9 pages
Proc. SPIE 10568, International Conference on Space Optics — ICSO 2004, 105680A (21 November 2017); doi: 10.1117/12.2308000
Show Author Affiliations
Oleg I. Korablev, Space Research Institute (Russian Federation)
Jean-Loup Bertaux, Service d'Aeronomie (France)
Imant I. Vinogradov, Space Research Institute (Russian Federation)
Yurii K. Kalinnikov, AFAR, NPO SPURT (Russian Federation)
D. Nevejans, Belgian Institute for Space Aeronomy (Belgium)
E. Neefs, Belgian Institute for Space Aeronomy (Belgium)
T. Le Barbu, Univ. of Reims (France)
Service d'Aeronomie (France)
G. Durry, Univ. of Reims (France)
Service d'Aeronomie (France)

Published in SPIE Proceedings Vol. 10568:
International Conference on Space Optics — ICSO 2004
Josiane Costeraste; Errico Armandillo, Editor(s)

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