Characterization of the holographic imaging grating of GOMOS UVIS spectrometer

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

doi:10.1117/12.256220

1 November 1996 Characterization of the holographic imaging grating of GOMOS UVIS spectrometer

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

Author Affiliations +

Proceedings Volume 2863, Current Developments in Optical Design and Engineering VI; (1996) https://doi.org/10.1117/12.256220
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

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.

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Jussi Graeffe, Heikki K. Saari, Heikki Astola, Kari Rainio, Lorand Mazuray, Dominique Pierot, Pierre Craen, Michel Gruslin, Jean-Herve Lecat, Francis Bonnemason, Jean Flamand, and Alain Thevenon "Characterization of the holographic imaging grating of GOMOS UVIS spectrometer", Proc. SPIE 2863, Current Developments in Optical Design and Engineering VI, (1 November 1996); https://doi.org/10.1117/12.256220

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KEYWORDS

Holography

Sensors

Diffraction gratings

Interfaces

Spectroscopy

Imaging systems

Monochromatic aberrations

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