1- to 5-μm imaging detector for the ADONIS adaptive optics system

Feautrier, Philippe; Geoffray, Hervé; Petmezakis, P.; Monin, Jean‐Louis; Coarer, E. Le; Audaire, Luc

doi:10.1117/12.185848

Cited by 1 publication

(2 citation statements)

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“…The preliminary performances in terms of readout noise, quantum efficiency, dark current, linearity response, and spatial homogeneity of an engineering model of the LIR detector were measured at Observatoire de Grenoble and at LETI-LIR using a laboratory test bench. All of these results have been reported in a previous paper (Feautrier et al 1994). Results concerning the science-grade detector, measured in the camera cryostat at Observatoire de Paris, are reported below.…”

Section: Calibration Resultsmentioning

confidence: 70%

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Adaptive Optics Imaging at 1–5 Microns on Large Telescopes: The COMIC Camera for ADONIS

Lacombe

Marco

Geoffray

et al. 1998

PUBL ASTRON SOC PAC

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A new 1-5 mm high-resolution camera dedicated to the ESO adaptive optics system ADONIS has been developed as a collaborative project of Observatoire de Paris-Meudon and Observatoire de Grenoble, under ESO contract. Since this camera has been designed to correctly sample the diffraction, two focal plate scales are available: 36 mas pixel Ϫ1 for the 1-2.5 mm range and 100 mas pixel Ϫ1 for the 3-5 mm range, yielding fields of view of and , respectively. Several broadband and narrowband filters are available 4Љ .5 # 4Љ .512Љ .8 # 12Љ .8 as well as two circular variable filters, allowing low spectral resolution ( -120) imagery between 1.2 and R ∼ 60 4.8 mm. This camera is equipped with a HgCdTe/CCD array detector built by the CEA-LETI-LIR 128 # 128 (Grenoble, France). Among its main characteristics, this detector offers a remarkably high storage capacity (more than 10 6 electrons) with a total system readout noise of ≈1000 electrons rms, making it particularly well suited for long integration time imagery in the 3-5 mm range of the near-infrared domain. The measured dark current is 2000 electrons s Ϫ1 pixel Ϫ1 at the regular operating temperature of 77 K, allowing long exposure times at short wavelengths ( mm), where the performances are readout-noise limited. At longer wavelengths ( mm), l ! 3 l 1 3 the performances are background-noise limited. We have estimated the ADONIS ϩ COMIC imaging performances using a method specially dedicated to high angular resolution cameras.

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Section: Calibration Resultsmentioning

confidence: 70%

“…This detector has been extensively described in a previous paper (Feautrier et al 1994). The COMIC detector is a HgCdTe photovoltaic focal plane array built by the 128 # 128 French manufacturer LETI/LIR in Grenoble.…”

Section: Detector Characteristicsmentioning

confidence: 99%