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Proceedings Paper

Characterization of the holographic imaging grating of GOMOS UVIS spectrometer
Author(s): Jussi Graeffe; Heikki K. Saari; Heikki Astola; Kari Rainio; Lorand Mazuray; Dominique Pierot; Pierre Craen; Michel Gruslin; Jean-Herve Lecat; Francis Bonnemason; Jean Flamand; Alain Thevenon
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Paper Abstract

A Finnish-French group has proposed an imaging spectrometer- based instrument for the ENVISAT Earth observation satellite of ESA, which yields a global mapping of the vertical profile of ozone and other related atmospheric gases. The GOMOS instrument works by measuring the UV-visible spectrum of a star that is occulting behind the Earth's atmosphere. The prime contractor of GOMOS is Matra Marconi Space France. The focal plane optics are designed and manufactured by Spacebel Instrumentation S.A. and the holographic grating by Jobin-Yvon. VTT Automation, Measurement Technology has participated in the GOMOS studies since 1989 and is presently responsible for the verification tests of the imaging quality and opto-mechanical interfaces of the holographic imaging grating of GOMOS. The UVIS spectrometer of GOMOS consists of a holographic, aberration corrected grating and of a CCD detector. The alignment of the holographic grating needs as an input very accurate knowledge of the mechanical interfaces. VTT Automation has designed, built and tested a characterization system for the holographic grating. This system combines the accurate optical imaging measurements with the absolute knowledge of the geometrical parameters at the accuracy of plus or minus 10 micrometers which makes the system unique. The developed system has been used for two breadboard gratings and the qualification model grating. The imaging quality results and their analysis together with alignment procedure utilizing of the knowledge of mechanical interfaces is described.

Paper Details

Date Published: 1 November 1996
PDF: 9 pages
Proc. SPIE 2863, Current Developments in Optical Design and Engineering VI, (1 November 1996); doi: 10.1117/12.256220
Show Author Affiliations
Jussi Graeffe, VTT Automation (Finland)
Heikki K. Saari, VTT Automation (Finland)
Heikki Astola, VTT Automation (Finland)
Kari Rainio, VTT Automation (Finland)
Lorand Mazuray, Matra Marconi Space France (France)
Dominique Pierot, Matra Marconi Space France (France)
Pierre Craen, Spacebel Instrumentation SA (Belgium)
Michel Gruslin, Spacebel Instrumentation SA (Belgium)
Jean-Herve Lecat, Spacebel Instrumentation SA (Belgium)
Francis Bonnemason, Instruments SA (France)
Jean Flamand, Instruments SA (France)
Alain Thevenon, Instruments SA (France)

Published in SPIE Proceedings Vol. 2863:
Current Developments in Optical Design and Engineering VI
Robert E. Fischer; Warren J. Smith, Editor(s)

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