Thermography Primer - Spectrum Instruments Ltd.

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Black and white and color thermograms of a person; and a visible light photograph. Note the glasses appear cool because they
are cooler than the skin and longwave infrared energy will not pass through glass. You can see the temperature patterns on the
face, reds are warmer, yellows and greens are cooler. Thermal patterns on the skin surface can be indicative of disease and are
sometimes used to aid medical diagnoses.
A thermogram and visual image of a plastic kettle after heating water. Notice that you can see the heat from the water conducting through the walls. Liquid levels in industrial tanks can be measured in the same manner.
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