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Proceedings Paper

Comparison of persistence in spot versus flat field illumination and single pixel response on a Euclid HAWAII-2RG at ESTEC
Author(s): Pierre-Elie Crouzet; Ludovic Duvet; Paolo Strada; Ralf Kohley; Remi Barbier; Thierry Beaufort; Sander Blommaert; Bart Butler; Gertjan Van Duinkerken; David Gooding; Joerg Ter Haar; Jerko Heijnen; Frederic Lemmel; Cornelis Van der Luijt; Hans Smit; Visser Ivo
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Paper Abstract

Euclid is an ESA mission to map the geometry of the dark Universe with a planned launch date in 2020. Euclid is optimised for two primary cosmological probes, weak gravitational lensing and galaxy clustering. They are implemented through two science instruments on-board Euclid, a visible imager (VIS) and a near-infrared spectro-photometer (NISP), which are being developed and built by the Euclid Consortium instrument development teams. The NISP instrument contains a large focal plane assembly of 16 Teledyne HgCdTe HAWAII-2RG detectors with 2.3μm cut-off wavelength and SIDECAR readout electronics. While most Euclid NISP detector system on-ground tests involve flat-field illumination, some performance tests require point-like sources to be projected onto the detector. For this purpose a dedicated test bench has been developed by ESA at ESTEC including a spot projector capable of generating a Euclid-like PSF. This paper describes the test setup and results from two characterisation tests involving the spot projector. One performance parameter to be addressed by Euclid is image (charge) persistence resulting from previous exposures in the science acquisition sequence. To correlate results from standard on-ground persistence tests from flat-field illumination to realistic scenes, the persistence effect from spot illumination has been evaluated and compared to the flat-field. Another important aspect is the photometric impact of intra-pixel response variations. Preliminary results of this measurement on a single pixel are presented.

Paper Details

Date Published: 5 August 2016
PDF: 14 pages
Proc. SPIE 9915, High Energy, Optical, and Infrared Detectors for Astronomy VII, 99151E (5 August 2016); doi: 10.1117/12.2230836
Show Author Affiliations
Pierre-Elie Crouzet, European Space Research and Technology Ctr. (Netherlands)
Ludovic Duvet, European Space Research and Technology Ctr. (Netherlands)
Paolo Strada, European Space Research and Technology Ctr. (Netherlands)
Ralf Kohley, European Space Astronomy Ctr. (Spain)
Remi Barbier, Institut de Physique Nucléaire de Lyon (France)
Thierry Beaufort, European Space Research and Technology Ctr. (Netherlands)
Sander Blommaert, European Space Research and Technology Ctr. (Netherlands)
Bart Butler, European Space Research and Technology Ctr. (Netherlands)
Gertjan Van Duinkerken, European Space Research and Technology Ctr. (Netherlands)
David Gooding, European Space Research and Technology Ctr. (Netherlands)
Joerg Ter Haar, European Space Research and Technology Ctr. (Netherlands)
Jerko Heijnen, European Space Research and Technology Ctr. (Netherlands)
Frederic Lemmel, European Space Research and Technology Ctr. (Netherlands)
Cornelis Van der Luijt, European Space Research and Technology Ctr. (Netherlands)
Hans Smit, European Space Research and Technology Ctr. (Netherlands)
Visser Ivo, European Space Research and Technology Ctr. (Netherlands)


Published in SPIE Proceedings Vol. 9915:
High Energy, Optical, and Infrared Detectors for Astronomy VII
Andrew D. Holland; James Beletic, Editor(s)

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