FLIR ThermaCAM B2, User Manual

Page: 14 / 192

131 16 Thermographic measurement techniques ...................................................................................
131 16.1 Introduction ..........................................................................................................................
131 16.2 Emissivity ..............................................................................................................................
132 16.2.1 Finding the emissivity of a sample .......................................................................
132 16.2.1.1 Step 1: Determining reflected apparent temperature .......................
134 16.2.1.2 Step 2: Determining the emissivity ...................................................
135 16.3 Reflected apparent temperature ..........................................................................................
137 17 History of infrared technology ......................................................................................................
141 18 Theory of thermography ................................................................................................................
141 18.1 Introduction ...........................................................................................................................
141 18.2 The electromagnetic spectrum ............................................................................................
142 18.3 Blackbody radiation ..............................................................................................................
143 18.3.1 Planck’s law ..........................................................................................................
144 18.3.2 Wien’s displacement law ......................................................................................
146 18.3.3 Stefan-Boltzmann's law .........................................................................................
146 18.3.4 Non-blackbody emitters .......................................................................................
149 18.4 Infrared semi-transparent materials .....................................................................................
151 19 Emissivity tables .............................................................................................................................
151 19.1 References ............................................................................................................................
151 19.2 Important note about the emissivity tables ..........................................................................
151 19.3 Tables ....................................................................................................................................
167 Index ................................................................................................................................................
xiv
Publ. No. 1557882 Rev. a156 – ENGLISH (EN) – February 28, 2006