18.2.1
Finding the emissivity of a sample
18.2.1.1
Step 1: Determining reflected apparent temperature
Use one of the following two methods to determine reflected apparent temperature:
18.2.1.1.1
Method 1: Direct method
Action
Step
Look for possible reflection sources, considering that the incident angle = reflection
angle (a = b).
10588903;a1
Figure 18.1 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 18.2 1 = Reflection source
2
18
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Publ. No. 1558240 Rev. a156 – ENGLISH (EN) – March 1, 2006
18 – Thermographic measurement techniques
