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Proceedings Paper

Transient response of ISOPHOT Si:Ga infrared photodetectors: experimental results and application of the theory of nonstationary processes
Author(s): Josef Schubert; Boris I. Fouks; Dietrich Lemke; Juergen Wolf
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Paper Abstract

Extrinsic photodetectors with implanted low ohmic contacts are used in ISOPHOT, which is one of the four focal plane instruments of the Infrared Space Observatory (ISO). If operated under the low temperature and low background conditions of ISO, such detectors show a highly nonlinear transient response to step changes of infrared illumination. For the Si:Ga detector arrays in PHT-S, the spectrometer in ISOPHOT, we are able to describe accurately the nonlinear photoresponse by a simple analytical function of time. Based on the theory, fundamental detector constants characterizing the dynamic behavior of such detectors can be extracted from experimental data. This allows the prediction of the steady state signals of short time measurements that have not stabilized after an illumination change. Results are presented on the dynamic effects of step-like flux changes and on the observed nonstationary injection of carriers due to temperature variations of the detector. The optimization of the in-orbit observation strategy is discussed using theory and experimental results.

Paper Details

Date Published: 29 September 1995
PDF: 9 pages
Proc. SPIE 2553, Infrared Spaceborne Remote Sensing III, (29 September 1995); doi: 10.1117/12.221378
Show Author Affiliations
Josef Schubert, Max-Planck-Institut fuer Astronomie (Germany)
Boris I. Fouks, Institute of Radioengineering and Electronics (Russia)
Dietrich Lemke, Max-Planck-Institut fuer Astronomie (Germany)
Juergen Wolf, Max-Planck-Institut fuer Astronomie (Germany)


Published in SPIE Proceedings Vol. 2553:
Infrared Spaceborne Remote Sensing III
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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