VUV optical ground system equipment and its application to the ICON FUV flight grating characterization and selection

Pascal Blain; Richard Desselle; Isabelle Domken; Christian Kintziger; Etienne Renotte; Yvan Stockman; Cathy Chou; Harald U. Frey; Kodi Rider; Stephen B. Mende; Jerome Loicq

doi:10.1117/12.2233133

22 July 2016 VUV optical ground system equipment and its application to the ICON FUV flight grating characterization and selection

Pascal Blain, Richard Desselle, Isabelle Domken, Christian Kintziger, Etienne Renotte, Yvan Stockman, Cathy Chou, Harald U. Frey, Kodi Rider, Stephen B. Mende, Jerome Loicq

Author Affiliations +

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 99124O (2016) https://doi.org/10.1117/12.2233133
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

ICON FUV is a two channel spectrographic imager that measures intensity and spatial distribution of oxygen (135.6 nm) and molecular nitrogen (157 nm) of the ionosphere. As those wavelengths are strongly absorbed by the atmosphere, the optical elements of the system have to be tested inside vacuum chambers. Prior to the instrument alignment and calibration, two 3600 gr/mm gratings were characterized. The primary focus is the measurement of the diffraction efficiencies; while the second objective is to select the best grating and to define which is the flight and the spare. A dedicated setup has been developed to assess the grating optical performances under vacuum. A 1 cm diameter collimated beam is generated using an off-axis parabola and a UV source at its focal point. The grating is placed at the center of two rotation stages collinearly aligned. One detector is placed on a rotating arm, deported from its rotation center. A PMT detector records diffracted light intensity with respect to its angular position and its wavelength. Angular incidence on the grating is tuned with the help of the second rotation stage. The grating efficiency homogeneity and scattering properties are measured through a Y-X scan.

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Pascal Blain, Richard Desselle, Isabelle Domken, Christian Kintziger, Etienne Renotte, Yvan Stockman, Cathy Chou, Harald U. Frey, Kodi Rider, Stephen B. Mende, and Jerome Loicq "VUV optical ground system equipment and its application to the ICON FUV flight grating characterization and selection", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99124O (22 July 2016); https://doi.org/10.1117/12.2233133

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