Euclid flight H2RG IR detectors: per pixel conversion gain from on-ground characterization for the Euclid NISP instrument

Secroun, A.; Barbier, R.; Buton, C.; Clémens, J. C.; Conversi, L.; Ealet, A.; Ferriol, S.; Fornari, F.; Kohley, R.; Kubik, B.; Rosset, C.; Serra, Benoit; Smadja, G.; Zoubian, J.

doi:10.1117/12.2312518

Cited by 3 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this purpose, only ramps acquired with an input flux lower than 90 e s −1 , which corresponds to 60 % of the full well at maximum, are used. Moreover, it has been shown in a previous work 27 that persistence can heavily affect the apparent flux, especially in the first frames of a ramp, by for instance trapping charges, which in turn reduces the ADU signal. Ignoring the 100 first frames of the ramps will mitigate the persistence effect.…”

Section: Methodsmentioning

confidence: 92%

See 1 more Smart Citation

Euclid Near Infrared Spectro-Photometer: spatial considerations on H2RG detectors interpixel capacitance and IPC corrected conversion gain from on-ground characterization

Graët

Secroun²,

Barbier

et al. 2022

X-Ray, Optical, and Infrared Detectors for Astronomy X

Self Cite

View full text Add to dashboard Cite

Euclid is a major ESA mission scheduled for launch in 2023-2024 to map the geometry of the dark Universe using two primary probes, weak gravitational lensing and galaxy clustering. Euclid 's instruments, a visible imager (VIS) and an infrared spectrometer and photometer (NISP) have both been designed and built by Euclid Consortium teams. The NISP instrument will hold a large focal plane array of 16 near-infrared H2RG detectors, which are key elements to the performance of the NISP, and therefore to the science return of the mission.Euclid NISP H2RG flight detectors have been individually and thoroughly characterized at Centre de Physique des Particules de Marseille (CPPM) during a whole year with a view to producing a reference database of performance pixel maps. Analyses have been ongoing and have shown the relevance of taking into account spatial variations in deriving performance parameters. This paper will concentrate on interpixel capacitance (IPC) and conversion gain. First, per pixel IPC coefficient maps will be derived thanks to single pixel reset (SPR) measurements and a new IPC correction method will be defined and validated. Then, the paper will look into correlation effects of IPC and their impact on the derivation of per super-pixel IPC-free conversion gain maps. Eventually, several conversion gain values will be defined over clearly distinguishable regions.

show abstract

Section: Methodsmentioning

confidence: 92%

“…The adapted method which we refer to as spatial version of mean variance was described by Secroun et al 27 It estimates the variance and mean over a N×N super-pixel and averages the results over multiple realizations taken at different times. This method assumes that spatial variance is equivalent to temporal variance.…”

Section: Conversion Gainmentioning

confidence: 99%

Euclid Near Infrared Spectro-Photometer: spatial considerations on H2RG detectors interpixel capacitance and IPC corrected conversion gain from on-ground characterization

Graët

Secroun²,

Barbier

et al. 2022

X-Ray, Optical, and Infrared Detectors for Astronomy X

Self Cite

View full text Add to dashboard Cite

show abstract

“…The calibration campaign at CPPM (Flight Model (FM) calibration campaign) was scheduled in blocks of 4 SCS tested in parallel in two identical cryostats, each test block lasting more than 1.5 months to complete, and coming now to its end with the final testing of the 4 Flight Spare SCAs. The description of the overall test campaign as well as the overall calibration strategy are presented in two additional Euclid papers of this conference (see [5] and [6]). For the follow-up study of the effect of random telegraph signal (RTS) and noise (RTN) in the Euclid infrared H2RGs, we analysed data from all 16 Flight SCAs tested at CPPM together with data from additional tests on two non-flight SCAs at ESA's European Space Research and Technology Centre (ESTEC) and at CPPM.…”

Section: Introductionmentioning

confidence: 99%

Random telegraph signal (RTS) in the Euclid IR H2RGs

Kohley

Barbier

Clémens

et al. 2018

High Energy, Optical, and Infrared Detectors for Astronomy VIII

Self Cite

View full text Add to dashboard Cite

Euclid is an ESA mission to map the geometry of the dark Universe with a planned launch date in 2021. Euclid is optimised for two primary cosmological probes, weak gravitational lensing and baryonic acoustic oscillations. They are implemented through two science instruments on-board Euclid, a visible imager (VIS) and a near-infrared photometer/spectrometer (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 H2RG detectors with 2.3 µm cut-off wavelength and SIDECAR readout electronics. The performance of the detector systems is critical for the science return of the mission and extended on-ground tests are being performed for characterisation and calibration purposes. Special attention is given also to effects even on the scale of individual pixels, which are difficult to model and calibrate, and to identify any possible impact on science performance. This paper discusses the known effect of random telegraph signal (RTS) in a follow-on study of test results from the Euclid NISP detector system demonstrator model [1], addressing open issues and focusing on an in-depth analysis of the RTS behaviour over the pixel population on the studied Euclid H2RGs.

show abstract

Calibration of MAJIS (Moons and Jupiter Imaging Spectrometer). IV. Radiometric calibration (invited)

Langevin,

Poulet,

Piccioni

et al. 2024

Review of Scientific Instruments

View full text Add to dashboard Cite

The MAJIS (Moons and Jupiter Imaging Spectrometer) instrument is an imaging spectrometer on-board the JUICE (JUpiter ICy moons Explorer) spacecraft. MAJIS covers the spectral range from 0.5 to 5.54 μm with two channels [visible–near infrared (VISNIR) and IR]. A comprehensive campaign of on-ground MAJIS calibration was conducted in August and September 2021 in the IAS (Institut d’Astrophysique Spatiale, CNRS/Université Paris-Saclay) facilities. In this article, we present the results relevant for the radiometric calibration of MAJIS. Due to the specific characteristics of the MAJIS detectors (H1RG from Teledyne), an extensive detector characterization campaign was implemented for both the VISNIR and IR detectors before integration so as to validate readout procedures providing precision and accuracy. The characterization also provided critical information on linearity and operability as a function of the integration time and operating temperature. The radiometric calibration of the integrated MAJIS instrument focused on the determination of the instrument transfer function in terms of DN output per unit of radiance for each MAJIS data element as a function of its position in the field of view of MAJIS and its central wavelength. The radiometric calibration of the VISNIR channel required a specific procedure due to stray light at short wavelengths. Observations of an internal calibration source during calibration and after launch (April 14, 2023) showed that there were minor changes in both the VISNIR and IR channels. The instrument transfer functions to be used in flight have been updated on this basis.

show abstract

Euclid flight H2RG IR detectors: per pixel conversion gain from on-ground characterization for the Euclid NISP instrument

Cited by 3 publications

References 11 publications

Euclid Near Infrared Spectro-Photometer: spatial considerations on H2RG detectors interpixel capacitance and IPC corrected conversion gain from on-ground characterization

Euclid Near Infrared Spectro-Photometer: spatial considerations on H2RG detectors interpixel capacitance and IPC corrected conversion gain from on-ground characterization

Random telegraph signal (RTS) in the Euclid IR H2RGs

Calibration of MAJIS (Moons and Jupiter Imaging Spectrometer). IV. Radiometric calibration (invited)

Contact Info

Product

Resources

About