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

Blain, Pascal; Desselle, Richard; Domken, Isabelle; Kintziger, Christian; Renotte, Étienne; Stockman, Yvan; Chou, Cathy; Frey, H. U.; Rider, Kodi; Mende, S. B.; Loicq, Jérôme

doi:10.1117/12.2233133

Cited by 1 publication

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“…The instrument was shipped with the visible grating in place so that it could be re-tested in Belgium. The 3600 lines/mm flight grating was tested (Blain et al 2016) and installed with the flight detectors in Belgium. …”

Section: Visible Alignment and Testingmentioning

confidence: 99%

The Far Ultra-Violet Imager on the Icon Mission

et al. 2017

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ICON Far UltraViolet (FUV) imager contributes to the ICON science objectives by providing remote sensing measurements of the daytime and nighttime atmosphere/ionosphere. During sunlit atmospheric conditions, ICON FUV images the limb altitude profile in the shortwave (SW) band at 135.6 nm and the longwave (LW) band at 157 nm perpendicular to the satellite motion to retrieve the atmospheric O/N 2 ratio. In conditions of atmospheric darkness, ICON FUV measures the 135.6 nm recombination emission of O + ions used to compute the nighttime ionospheric altitude distribution. ICON Far UltraViolet (FUV) imager is a Czerny-Turner design Spectrographic Imager with two exit slits and corresponding back imager cameras that produce two independent images in separate wavelength bands on two detectors. All observations will be processed as limb altitude profiles. In addition, the ionospheric 135.6 nm data will be processed as longitude and latitude spatial maps to obtain images of ion distributions around regions of equatorial spread F. The ICON FUV optic axis is pointed 20 degrees below local horizontal and has a steering mirror that allows the field of view to be steered up to 30 degrees forward and aft, to keep the local magnetic meridian in the field of view. The detectors are micro channel plate (MCP) intensified FUV tubes with the phosphor fiber-optically coupled to Charge Coupled Devices (CCDs). The dual stack MCP-s amplify the photoelectron signals to overcome the CCD noise and the rapidly scanned frames are co-added to digitally create 12-second integrated images. Digital on-board signal processing is used to compensate for geometric distortion and satellite motion and to achieve data compression. The instrument was originally aligned in visible light by using a special grating and visible cameras. Final alignment, functional and environmental testing and calibration were performed in a large vacuum chamber with

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Section: Visible Alignment and Testingmentioning

confidence: 99%