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Proceedings Paper

Altering the SNR by noise manipulation
Author(s): Michael K. Rafailov
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Paper Abstract

Irradiation of a photodetector by very short pulses is presented as the primary and perhaps the only remote technology for altering the SNR. Such noise manipulation will decrease the SNR value for certain types of common MIR and LWIR photodetectors. The effect is based on the differences between carrier lifetime, detector material heat transfer rate and altering pulse dwell time. When the pulse width is much less than photodetector rise time, most of the photons cannot generate free carriers, but only heat. Since the heat transfer rate in semiconductors is much slower than carrier's lifetime, high temperature will affect the detector much longer than common input signal correlation length or frame period. We describe thermal, radiometric and electronic circuit models developed to simulate the transfer of short pulses of time-dependent radiant and electrical signals through a photodetector during the alteration. The models are developed to provide an analysis tool for evaluating the time-dependent radiometric sensitivity for the remote gain control of IR photodetectors.

Paper Details

Date Published: 15 December 2000
PDF: 6 pages
Proc. SPIE 4130, Infrared Technology and Applications XXVI, (15 December 2000); doi: 10.1117/12.409847
Show Author Affiliations
Michael K. Rafailov, VICAR International Co. (United States)

Published in SPIE Proceedings Vol. 4130:
Infrared Technology and Applications XXVI
Bjorn F. Andresen; Gabor F. Fulop; Marija Strojnik, Editor(s)

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