Correction and curing of in-orbit-induced nonideal behavior of ISOPHOTS's photodetectors

Josef Schubert; Gabriele Roth; Juergen Wolf; Dietrich Lemke; Boris I. Fouks

doi:10.1117/12.185839

14 September 1994 Correction and curing of in-orbit induced nonideal behavior of ISOPHOTS's photodetectors

Josef Schubert, Gabriele Roth, Juergen Wolf, Dietrich Lemke, Boris I. Fouks

Proceedings Volume 2268, Infrared Spaceborne Remote Sensing II; (1994) https://doi.org/10.1117/12.185839
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

ISOPHOT, the photo-polarimeter on the Infrared Space Observatory (ISO) uses high sensitivity doped silicon and germanium photodetectors working in the wavelength range form 2.4 to 240 micrometers . Under low IR-background conditions such detectors show long and non-linear response relaxation to a step change of IR-illumination. We will show that this nonideal behavior can be described with high precision at least for the PHT-S Si:Ga detectors. In space, high- energy radiation will strongly influence the performance of the detectors operated a low temperature. Irradiation tests using a (gamma) -radiation source were performed on our Ge:Ga and stressed Ge:Ga detector simulating the radiation environment on the ISO orbit. We found annealing procedures for the detectors which restore the photometric calibrations to within a few percent.

Citation Download Citation

Josef Schubert, Gabriele Roth, Juergen Wolf, Dietrich Lemke, and Boris I. Fouks "Correction and curing of in-orbit induced nonideal behavior of ISOPHOTS's photodetectors", Proc. SPIE 2268, Infrared Spaceborne Remote Sensing II, (14 September 1994); https://doi.org/10.1117/12.185839

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