19.2.1 Finding the emissivity of a sample
19.2.1.1 Step 1: Determining reflected apparent temperature
Use one of the following two methods to determine reflected apparent temperature:
19.2.1.1.1 Method 1: Direct method
Look for possible reflection sources, considering that the incident angle = reflection angle (a
= b).
10588903;a1
Figure 19.1 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 19.2 1 = Reflection source
2
60 Publ. No. T559498 Rev. a461 – ENGLISH (EN) – August 19, 2010
19 – Thermographic measurement techniques
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