Understanding Infrared Thermography Reading 7 Part 2 of 2.pdf

Minimum resolvable temperature MRT
MRT and the terms relating to spatial resolution are interrelated and cannot
be considered independently. (unlike the point sensing: IR thermometer)
Other parameters, such as spectral ranges, target temperature ranges,
accuracy and repeatability, and focusing distances, are essentially the same
as those defined previously for infrared radiation thermometers, although they
can be expressed differently. Dynamic range and reference level range, for
example, are the terms that define the target temperature ranges for thermal
imagers. While the operating spectral range of a radiation thermometer is
often critical to its performance, the spectral range of operation of a thermal
imager is not usually as critical to the user, except for a few specialized
applications. Most commercial thermal imagers operate in either the 2.5 µm
or the 8.12 µm atmospheric window, depending on the manufacturer’s choice
of detector. Filter wheels or slides are usually available to enable users to
insert special interference filters and perform spectrally selective
measurements when necessary.
Charlie Chong/ Fion Zhang