Calculation of thermal contrasts and potentials of the infrared images in spectral ranges 3-5 um and 8-14 um at the availability and in the absence of counterradiation of the environment

A. N. Sviridov

doi:10.1117/12.517351

30 September 2003 Calculation of thermal contrasts and potentials of the infrared images in spectral ranges 3-5 μm and 8-14 μm at the availability and in the absence of counterradiation of the environment

A. N. Sviridov

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Proceedings Volume 5126, 17th International Conference on Photoelectronics and Night Vision Devices; (2003) https://doi.org/10.1117/12.517351
Event: 2003 Chapter books, 2003, Bellingham, WA, United States

Abstract

The calculations (for two spectral ranges, used in thermal imagines: 3...5 μm and 8...14 μm of thermal contrasts and potentials of the infrared images of objects of observation (OO), were carried out both availability the counterradiation of the environment, and in the absence of the counterradiation. (The counterradiation is a radiation, falling on OO, from the sky, from the surface of the Earth and from surface of the Earth surface). Is shown that in the infrared image in viewed spectral ranges (unlike the images of these OO in a visual spectral range) always (both at availability of and in its absence the counterradiation disappearance of some local areas (LA) - OO areas which temperature or (and) numerical coefficient γi the quantity of which is determined by is temperature, reflection factor and average for OO values of these quantities. The calculations of numerical quantities of coefficients of disappearing LA on the temperature of the environment were carried out. It is shown that the availability of a counterradiation alongside with the decrease diminution of the image contrast can (under certain conditions) result in inversion, i.e. that LA with smaller coefficients of radiation acquire more brightness, than LA with larger coefficients of radiation.

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A. N. Sviridov "Calculation of thermal contrasts and potentials of the infrared images in spectral ranges 3-5 μm and 8-14 μm at the availability and in the absence of counterradiation of the environment", Proc. SPIE 5126, 17th International Conference on Photoelectronics and Night Vision Devices, (30 September 2003); https://doi.org/10.1117/12.517351

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KEYWORDS

Thermography

Infrared imaging

Infrared radiation

Reflection

Temperature metrology

Autoregressive models

Visible radiation

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