Analysis of utmost capabilities of detection of objects with the help of an observation thermal imager

A. N. Sviridov

doi:10.1117/12.517348

30 September 2003 Analysis of utmost capabilities of detection of objects with the help of an observation thermal imager

A. N. Sviridov

Author Affiliations +

Proceedings Volume 5126, 17th International Conference on Photoelectronics and Night Vision Devices; (2003) https://doi.org/10.1117/12.517348
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

A mathematical model of an ideal observing thermal imager is developed. It was supposed at designing a model that: -the main noise source is a shot noise of photons irradiating photosensitive element (PSE); -temperatures and reflection factors of observed objects differ a little from corresponding scene characteristics; -image light brightness of i -th local object area on the indicator screen of the thermal imager (useful signal) is determined by the difference between on electric charge accumulated in PSE channel optically conjugated with this local area an electric charge accumulated in PSE channel optically conjugated with the scene. It is shown that detection possibility of i -th local object area on the thermal imager screen is determined unequivocally by its numerical index γ_i[equation] were Rep - the scene factor, t and r, correspondingly, are relations of temperatures and reflection factors of i-th local area and the scene. Calculations are carried of utmost signal / noise relations (for two spectral ranges used in thermal imaging : 3 - 5 μm and 8-14 μm) taking into account counterradiation, angular sizes of objects, characteristics of objects and the scene.

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A. N. Sviridov "Analysis of utmost capabilities of detection of objects with the help of an observation thermal imager", Proc. SPIE 5126, 17th International Conference on Photoelectronics and Night Vision Devices, (30 September 2003); https://doi.org/10.1117/12.517348

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