FLIR Extech IRC30 - Finding the Emissivity of a Sample; Step 1: Determining Reflected Apparent Temperature

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
Publ. No. T559580 Rev. a486 – ENGLISH (EN) – November 17, 2010 125
20 – Thermographic measurement techniques