14 September 1994 1- to 5-μm imaging detector for the ADONIS adaptive optics system
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Abstract
A 1-5 micron astronomical infrared imaging facility is currently under development at Observatoire de Grenoble for the ADONIS adaptive optics system, a collaborative project of Observatoire de Paris and Observatoire de Grenoble under ESO (European Southern Observatory) contract. This imaging detector will equip the camera to be installed at the F/45 output focus of the 3.6 m telescope operated by ESO at La Silla, Chile. The detector is a 128 X 128 HgCdTe/CCD array optimized in the 3-5 micron range, built by the CEA-LETI-LIR (Infrared Laboratory). The measured readout noise is less 450 electrons at a pixel readout rate of 415 kHz. The detector has a high storage capacity of 6.8 X 106 electrons yielding a dynamic range of about 84 dB. Such a high capacity is very useful, because adaptive optics allows large integration times up to a few minutes without degradation of the images by the atmospheric turbulence. Dark current is not a limitation for these large integration times even at an operation temperature of 77 K. A compact and versatile control electronics is being developed at the Observatoire de Grenoble. We will discuss the overall performances of the detector as well as the data acquisition and control systems built at Grenoble in the framework of astronomical imaging with adaptative optics techniques.
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Philippe Feautrier, Herve Geoffray, Panayoti Petmezakis, Jean-Louis Monin, Etienne le Coarer, Luc Audaire, "1- to 5-μm imaging detector for the ADONIS adaptive optics system", Proc. SPIE 2268, Infrared Spaceborne Remote Sensing II, (14 September 1994); doi: 10.1117/12.185848; https://doi.org/10.1117/12.185848
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