By G. Gaussorgues (auth.)
Infrared Thermography provides an intensive advent to the foundations, recommendations, and functions of infrared imaging structures. With its complete assurance and purposes orientation, this ebook presents an amazing educational creation to engineers and scientists drawn to utilizing infrared thermography.
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Additional resources for Infrared Thermography
Consider an object of this kind, exposed to a given amount of incident radiation . When the system is in a state of thermodynamic equilibrium, the energy released into the ambient medium as radiation plus energy reflected and transmitted, must equal the energy introduced into the system by absorption. 18) energy Fig. 3 PROBLEMS WITH THE EMISSIVITY OF A MATERIAL The power (or optical flux), which can only be measured by an infrared detector, is an a priori unknown function of the emissivity and temperature of the radiating elements.
3 Stefan-Boltzmann law This law is obtained by integrating of Planck's law between A = 0 and A = 00. 7) is Stefan's constant. 05 x 2 x 104 :::::: 1 kW 16 Infrared Thermography which assumes that the skin is a black body, which is valid in the infrared. We note, however, that this loss of energy is compensated by the absorption of radiation from the surroundings, in particular, clothes. 4 Exitance of a black body in a given spectral band The exitance of a black body between Aa and Ab is obtained by integrating Planck's law over the spectral interval: The following table gives the values of exitance of a black body, calculated for the spectral band ~A = Ab - Aa at temperatures normally encountered in thermography.
The reduction in emissivity at large angles of incidence results in a rise in reflectance according to Fresnel's laws for electromagnetic waves incident on a refracting surface. Measurement of infrared radiance and, hence of the temperature of objects that obey Lambert's law, yield the same value for all directions of observation on the surface of the object. However,' when the material is not governed by this law, its emissivity decreases with the angle of incidence for surfaces inclined at a large angle (more than 60°) and gives the apparent temperature that is lower than the true temperature.
Infrared Thermography by G. Gaussorgues (auth.)