In-flight performance and calibration of SPICAV SOIR onboard Venus Express

Arnaud Mahieux; Sophie Berkenbosch; Roland Clairquin; Didier Fussen; Nina Mateshvili; Eddy Neefs; Dennis Nevejans; Bojan Ristic; Ann Carine Vandaele; Valérie Wilquet; Denis Belyaev; Anna Fedorova; Oleg Korablev; Eric Villard; Franck Montmessin; Jean-Loup Bertaux

doi:10.1364/AO.47.002252

Applied Optics
Vol. 47,
Issue 13,
pp. 2252-2265
(2008)
•https://doi.org/10.1364/AO.47.002252

In-flight performance and calibration of SPICAV SOIR onboard Venus Express

Arnaud Mahieux, Sophie Berkenbosch, Roland Clairquin, Didier Fussen, Nina Mateshvili, Eddy Neefs, Dennis Nevejans, Bojan Ristic, Ann Carine Vandaele, Valérie Wilquet, Denis Belyaev, Anna Fedorova, Oleg Korablev, Eric Villard, Franck Montmessin, and Jean-Loup Bertaux

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Arnaud Mahieux, Sophie Berkenbosch, Roland Clairquin, Didier Fussen, Nina Mateshvili, Eddy Neefs, Dennis Nevejans, Bojan Ristic, Ann Carine Vandaele, Valérie Wilquet, Denis Belyaev, Anna Fedorova, Oleg Korablev, Eric Villard, Franck Montmessin, and Jean-Loup Bertaux, "In-flight performance and calibration of SPICAV SOIR onboard Venus Express," Appl. Opt. 47, 2252-2265 (2008)

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Table of Contents Category
- Instrumentation, Measurement, and Metrology
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About this Article
History
- Original Manuscript: November 12, 2007
- Revised Manuscript: February 29, 2008
- Manuscript Accepted: March 11, 2008
- Published: April 25, 2008

Abstract

Solar occultation in the infrared, part of the Spectoscopy for Investigation of Characteristics of the Atmosphere of Venus (SPICAV) instrument onboard Venus Express, combines an echelle grating spectrometer with an acousto-optic tunable filter (AOTF). It performs solar occultation measurements in the IR region at high spectral resolution. The wavelength range probed allows a detailed chemical inventory of Venus’s atmosphere above the cloud layer, highlighting the vertical distribution of gases. A general description of the instrument and its in-flight performance is given. Different calibrations and data corrections are investigated, in particular the dark current and thermal background, the nonlinearity and pixel-to-pixel variability of the detector, the sensitivity of the instrument, the AOTF properties, and the spectral calibration and resolution.

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Tuning Function					FWHM
Binning Case	Bin Number	A	B	C
$2 \times 12$	1	1.8914633080e-7	0.14774334848	336.08036871	24.145852651
$2 \times 12$	2	1.9604792544e-7	0.14711671129	338.40229096	24.118470220
$2 \times 16$	1	1.7571424024e-7	0.14835498551	330.01948237	24.182093372
$2 \times 16$	2	1.9483230511e-7	0.14707548060	338.89075713	24.099412078

	Order	143	144	145	146	147	148	149	150	151	152	153
AOTF centered	Maximum value (%)	0.74	0.83	1.65	4.72	77.82	100	69.43	4.72	1.65	0.83	0.69
AOTF centered	Mean value (%)	0.24	0.35	0.65	1.85	16.20	62.32	13.28	1.84	0.65	0.35	0.26
AOTF shifted	Maximum value (%)	0.83	1.22	1.65	4.72	92.60	100	49.27	4.72	1.65	0.83	0.50
AOTF shifted	Mean value (%)	0.27	0.40	0.69	1.86	24.04	59.72	8.09	1.70	0.66	0.33	0.22

Tuning Function					FWHM
Binning Case	Bin Number	A	B	C
$2 \times 12$	1	1.8914633080e-7	0.14774334848	336.08036871	24.145852651
$2 \times 12$	2	1.9604792544e-7	0.14711671129	338.40229096	24.118470220
$2 \times 16$	1	1.7571424024e-7	0.14835498551	330.01948237	24.182093372
$2 \times 16$	2	1.9483230511e-7	0.14707548060	338.89075713	24.099412078

	Order	143	144	145	146	147	148	149	150	151	152	153
AOTF centered	Maximum value (%)	0.74	0.83	1.65	4.72	77.82	100	69.43	4.72	1.65	0.83	0.69
AOTF centered	Mean value (%)	0.24	0.35	0.65	1.85	16.20	62.32	13.28	1.84	0.65	0.35	0.26
AOTF shifted	Maximum value (%)	0.83	1.22	1.65	4.72	92.60	100	49.27	4.72	1.65	0.83	0.50
AOTF shifted	Mean value (%)	0.27	0.40	0.69	1.86	24.04	59.72	8.09	1.70	0.66	0.33	0.22

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Applied Optics