31.2.1 Finding the emissivity of a sample
31.2.1.1 Step 1: Determining reflected apparent temperature
Use one of the following two methods to determine reflected apparent temperature:
31.2.1.1.1 Method 1: Direct method
Look for possible reflection sources, considering that the incident angle = reflection angle (a
= b).
10588903;a1
Figure 31.1 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 31.2 1 = Reflection source
2
Publ. No. 1558792 Rev. a460 – ENGLISH (EN) – July 1, 2010 211
31 – Thermographic measurement techniques
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