FLIR T4 series User Manual page 248

32 Thermographic measurement techniques
32.2.1.1.1 Method 1: Direct method
Follow this procedure:
1. Look for possible reflection sources, considering that the incident angle = reflection
angle (a = b).
Figure 32.1 1 = Reflection source
2. If the reflection source is a spot source, modify the source by obstructing it using a
piece if cardboard.
Figure 32.2 1 = Reflection source
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