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Proceedings Paper

Airborne UV and visible spectrometer for DOAS and radiometric measurements
Author(s): Andrea Petritoli; Giorgio Giovanelli; U. Bonafe; Daniele Bortoli; Ivan K. Kostadinov; Fabrizio Ravegnani
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Paper Abstract

A UV/Vis spectrometer (named GASCOD) for Differentiated Optical Absorption Spectroscopy (DOAS) has been developed at ISAO Institute and deployed for ground based measurements of stratospheric trace gases for several years at mid-latitudes and the Antarctic region. An airborne version, called GASCOD/A has been installed on board a M55-Geophysica airplane, a stratospheric research platform, capable of flying at an altitude of up to 20 Km. After a test campaign in Italy, the GASCOD/A performed successfully during the Airborne Polar Experiment in the winter 95/96. More recently, the instrument was upgraded to achieve higher sensitivity and reliability. Two additional radiometric channels were added. The input optics can turn in order to collect solar radiation from five different channels: one for detection of the zenith scattered radiation through the roof window (for DOAS measurement), two for direct and diffused radiation through two lateral windows and two for radiometric measurements through two 2(pi) optical heads mounted on the upper and bottom part of the aircraft and linked to the instrument by means of optical guides. The radiometric channels give us the possibility of calculating the photodissociation rate coefficients (J-values) of photochemical reactions involving ozone and nitrogen dioxides. The mechanical and optical layout of the instrument are presented and discussed, as well as laboratory tests and preliminary results obtained during flights onboard the M55- Geophysica.

Paper Details

Date Published: 20 October 1999
PDF: 11 pages
Proc. SPIE 3756, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III, (20 October 1999); doi: 10.1117/12.366415
Show Author Affiliations
Andrea Petritoli, ISAO/CNR (Italy)
Giorgio Giovanelli, ISAO/CNR (Italy)
U. Bonafe, ISAO/CNR (Italy)
Daniele Bortoli, ISAO/CNR (Italy)
Ivan K. Kostadinov, ISAO/CNR (Italy) and Solar Terrestrial Influences Lab./Bulgarian Academy of Sciences (Italy)
Fabrizio Ravegnani, ISAO/CNR (Italy)

Published in SPIE Proceedings Vol. 3756:
Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research III
Allen M. Larar, Editor(s)

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