Measure the radiation intensity (= apparent temperature) from the reflecting source using the
following settings:
■
Emissivity: 1.0
■
D
obj
: 0
You can measure the radiation intensity using one of the following two methods:
10589003;a2
Figure 20.3 1 = Reflection source
3
Note: Using a thermocouple to measure reflected apparent temperature is not recom-
mended for two important reasons:
■ A thermocouple does not measure radiation intensity
■ A thermocouple requires a very good thermal contact to the surface, usually by
gluing and covering the sensor by a thermal isolator.
20.2.1.1.2 Method 2: Reflector method
Crumble up a large piece of aluminum foil.1
Uncrumble the aluminum foil and attach it to a piece of cardboard of the same size.2
Put the piece of cardboard in front of the object you want to measure. Make sure that the side
with aluminum foil points to the camera.
3
Set the emissivity to 1.0.4
Publ. No. T559382 Rev. a358 – ENGLISH (EN) – June 23, 2009 129
20 – Thermographic measurement techniques
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