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Proceedings Paper

Image sharpening by on-chip tracking in IRAC2
Author(s): Gert Finger; Peter Biereichel; Manfred Meyer; Alan F. M. Moorwood
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Paper Abstract

ESO has recently installed a new infrared array camera IRAC2 which is equipped with a large format NICMOS3 256*256 Hg1-xCdzTe array detector. The performance of the instrument and the detector array will be discussed briefly. A new nondestructive readout scheme of the array will be presented which allows first order wavefront corrections of images degraded by atmospheric seeing. During the stare time the integration ramp of the detector signal is sampled every 100 msec. A regressional fit of the sample data points yields the slope of the integration ramp which is proportional to the flux received by a detector pixel. To this readout mode which is commonly used for IR arrays a small software module can be added to compensate the image motion of the observed object by shifting the nondestructively sampled images. This has the same effect as a tip tilt correction by an active optical element--but without the extra complexity of such a device. Lab tests and first results obtained at the telescope are presented.

Paper Details

Date Published: 20 October 1993
PDF: 12 pages
Proc. SPIE 1946, Infrared Detectors and Instrumentation, (20 October 1993); doi: 10.1117/12.158724
Show Author Affiliations
Gert Finger, European Southern Observatory (Germany)
Peter Biereichel, European Southern Observatory (Germany)
Manfred Meyer, European Southern Observatory (Germany)
Alan F. M. Moorwood, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 1946:
Infrared Detectors and Instrumentation
Albert M. Fowler, Editor(s)

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