Abstract
Extinction coefficients k(lambda) for water at 25 degrees C were determined through a broad spectral region by manually smoothing a point by point graph of k(lambda) vs wavelength lambda that was plotted for data obtained from a review of the scientific literature on the optical constants of water. Absorption bands representing k(lambda) were postulated where data were not available in the vacuum uv and soft x-ray regions. A subtractive Kramers-Kronig analysis of the combined postulated and smoothed portions of the k(lambda) spectrum provided the index of refraction n(lambda) for the spectral region 200 nm </= lambda </= 200 microm.
Highlights
Non-invasive thermographic methods are based on the measurement of IR radiation from human tissue and, by which using Kirchhoff’s law, it restores the temperature of the examined body region
The disadvantage of this method is that the temperature image is noisy due to the thermal influence of the tissue layer between the organ under study inside the medium and the thermal imager
The influence of various factors on the brightness increment distribution at the medium surface from a source shaped as a cylinder is studied
Summary
Non-invasive thermographic methods are based on the measurement of IR radiation from human tissue and, by which using Kirchhoff’s law, it restores the temperature of the examined body region. Где Ts∗= Ts + DTс (0, r) – температура поверхности при наличии в среде источника тепла, DT(z, r)*= DТ1(z) + DTс(z, r) – DTс(0, r). Действительно, в данном случае в спектральном интервале 2–9 мкм, когда источник находится на поверхности, при h = 0,05 см–1, отношение DВ(l)/В0(l) изменяется от 2,34 до 0,35.
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