Lumasense-technologies MCS640 Manual Manuel d'utilisateur télécharger pdf (Page 22)

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 reections and/or the measuring angle.

A small change in angle will reduce the emissivity enhancement.

Measuring by Wedge effect

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Lumasense-technologies MCS640 Manual Manuel d'utilisateur Page 22