20.2.1 Finding the emissivity of a sample
20.2.1.1 Step 1: Determining reflected apparent temperature
Use one of the following two methods to determine reflected apparent temperature:
20.2.1.1.1 Method 1: Direct method
Look for possible reflection sources, considering that the incident angle = reflection angle (a
= b).
10588903;a1
Figure 20.1 1 = Reflection source
1
If the reflection source is a spot source, modify the source by obstructing it using a piece if
cardboard.
10589103;a2
Figure 20.2 1 = Reflection source
2
128 Publ. No. T559382 Rev. a358 – ENGLISH (EN) – June 23, 2009
20 – Thermographic measurement techniques
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