Hamburg 2009 – scientific programme

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UP: Fachverband Umweltphysik

UP 8: Methoden I

UP 8.6: Talk

Thursday, March 5, 2009, 15:36–15:48, VMP 8 R206

Development of third generation Long Path DOAS-Optics and comparison with conventional techniques — •Jens Tschritter, Andre Merten, and Ulrich Platt — Institute for Environmental Physics, University of Heidelberg, INF 229, D-69120

The first active long path Instruments, developed 1979 by Platt and Perner consists of two telescopes acting as separate sending and receiving units. The next major step was the development of a coaxial telescope by Axelson 1989. Transmitting and receiving unit were combined in one instrument, thus having the advantage that all active components are at one end of the light path, however only one half of the primary mirror surface is used for transmission and receiving, respectively.

Now the third generation of DOAS-Optics has been developed. Using a special configuration of optical fibres allows to build a coaxial system which use the complete mirror for sending and receiving. In addition the fibre telescope provides a very simple and robust set-up. Analytical calculations and test measurements confirmed that light throughput as well as mechanical stability is greatly increased. Further on, measurement routines could be simplified, e.g. measuring reference spectra. This new fibre system offers new long path DOAS applications, due to compact and light instruments, which can be deployed at locations formerly inaccessible to LP-DOAS.