Altering the SNR by photodetector noise manipulation

Michael K. Rafailov

doi:10.1117/12.392551

24 July 2000 Altering the SNR by photodetector noise manipulation

Michael K. Rafailov

Proceedings Volume 4029, Targets and Backgrounds VI: Characterization, Visualization, and the Detection Process; (2000) https://doi.org/10.1117/12.392551
Event: AeroSense 2000, 2000, Orlando, FL, United States

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 difference between carrier lifetimes and altering pulse dwell time. When the pulse width is much less than photodetector rise time, i.e., 100 fs vs 10 ns, most of the photons can not generate an electrical charge, but only heat. 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.

Citation Download Citation

Michael K. Rafailov "Altering the SNR by photodetector noise manipulation", Proc. SPIE 4029, Targets and Backgrounds VI: Characterization, Visualization, and the Detection Process, (24 July 2000); https://doi.org/10.1117/12.392551

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KEYWORDS

Photodetectors

Signal to noise ratio

Sensors

Photons

Signal detection

Infrared sensors

Absorption

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