LumaSense Technologies MCS640 Manual - Manual (Page 22)

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Section 4 Principles of Thermal Imaging
3. Indirect measurement
Measure a sample similar to the measured object, and place it in a condition able
to be heated by a heater, etc. Then measure the object and the sample alternately
with the camera and when the indicated values are identical, measure the sample
with a contact-type thermometer. Adjust the emissivity of the thermal imager
to cause the temperature readout to match that of the contact measurement. The
resulting emissivity is that of the sample.
4. Measuring by Wedge effect
With this method, the emissivity of the measured surface itself is enhanced
through use of the wedge or semi-wedge effect. But one must be careful about
the number of reflections and/or the measuring angle.
A small change in angle will reduce the emissivity enhancement.
Measuring by Wedge effect