16 April 2008 Comparison between a low-light-level visible channel and an IR channel for spaceborne night imaging
Author Affiliations +
Abstract
Aiming at night time spaceborne imaging, we compare the expected performances of a low-light-level visible sensor with a conventional IR sensor. The low-light-level visible sensor, an electron multiplier CCD (EMCCD), is a close to ideal photon counting device, with possibly negligible dark current noise and negligible readout noise. This fact, along with the significant improvement of diffraction (about an order of magnitude), suggests an interesting competition between the two technologies. In essence, this is a tradeoff between noise and optical performances (favoring the visible channel) and basic target radiance (favoring IR). Other factors such as reliability and cost can also play an important role. While we consider two different spectral ranges with different imaging content, we are able to conduct a cautious theoretical comparison based on standard targets in various lighting conditions. We show that for a given set of system parameters, even when lighting conditions are favorable, i.e. a night with a full moon, the low-light-level visible channel performances are inferior to those of an IR channel. We also comment on the significance of the system working point regarding performances under varying condition.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Guy Raz, Guy Raz, Meira Citroen, Meira Citroen, Michael Berger, Michael Berger, "Comparison between a low-light-level visible channel and an IR channel for spaceborne night imaging", Proc. SPIE 6940, Infrared Technology and Applications XXXIV, 69401H (16 April 2008); doi: 10.1117/12.778873; https://doi.org/10.1117/12.778873
PROCEEDINGS
11 PAGES


SHARE
RELATED CONTENT

Design of dual band imaging system for space debris
Proceedings of SPIE (August 05 2014)
C RED One and C RED 2 SWIR advanced...
Proceedings of SPIE (April 27 2017)
Effects of pixel area versus number of pixels on FPA...
Proceedings of SPIE (September 30 1990)
Japanese Advanced Meteorological Imager
Proceedings of SPIE (January 04 2005)

Back to Top