Infrared Thermography and Thermal Nondestructive Testing by Vladimir Vavilov & Douglas Burleigh
Author:Vladimir Vavilov & Douglas Burleigh
Language: eng
Format: epub
ISBN: 9783030480028
Publisher: Springer International Publishing
(7.29)
By taking into consideration Eq. (7.19), Eq. (7.29) will acquire the following form in a particular spectral interval:
(7.30)
It is obvious that an IR system calibrated by a reference BB will show the apparent (radiation) temperature of a graybody Tap according to the equation:
(7.31)
Equation (7.31) is used in contemporary IR imaging radiometers for the correction of temperature readings, if the material emissivity ε and the ambient temperature Ta, as well as the distance to a test object, are inputted by the user. Note that two latter parameters determine the atmosphere transmission τatm (see Sect. 7.2.5).
In the “still” atmosphere, at distances less than 30–50 m, one can assume that τatm =1. Then, the basic thermography equation can be simply written as:
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