FLIR T4xx series User Manual page 10

Table of contents
29 Glossary ........................................................................................ 77
30 Thermographic measurement techniques .......................................... 80
30.1 Introduction .......................................................................... 80
30.2 Emissivity.............................................................................. 80
30.2.1 Finding the emissivity of a sample .................................... 80
30.3 Reflected apparent temperature................................................. 83
30.4 Distance ............................................................................... 83
30.5 Relative humidity .................................................................... 83
30.6 Other parameters.................................................................... 83
31 History of infrared technology........................................................... 85
32 Theory of thermography................................................................... 88
32.1 Introduction ........................................................................... 88
32.2 The electromagnetic spectrum................................................... 88
32.3 Blackbody radiation................................................................. 88
32.3.1 Planck's law ................................................................ 89
32.3.2 Wien's displacement law................................................ 90
32.3.3 Stefan-Boltzmann's law ................................................. 91
32.3.4 Non-blackbody emitters................................................. 92
32.4 Infrared semi-transparent materials............................................. 94
33 The measurement formula................................................................ 95
34 Emissivity tables ............................................................................. 99
34.1 References............................................................................ 99
34.2 Tables .................................................................................. 99
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