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Specific uses of thermal imagers are widespread. Thermal imagers are one of the predictive maintenance tools being widely used in commerce and industry. Thermal imagers with temperature measurement capability, called sometimes "Radiametric Imagers" and Quantitative Thermal Imagers" are used also in many Non-destructive testing situations and some of the professional societies for non-destructive testing around the world, such as the American Society for Non-destructive Testing (ASNT) in the USA, have adopted Infrared Testing as a sanctioned testing method.

When the sun goes down and the other sources of illumination are removed, there is no light to be reflected and most mammals, especially, cannot see anything.  The unaided human eye cannot see infrared radiation, but the radiation is always present. It is heat or thermal radiation in a portion of the Electromagnetic (EM) spectrum to which our eyes do not respond. Our bodies respond to infrared, if it is intense enough, by feeling warmed, or sometimes, cooled.

 Every object at temperatures above Absolute Zero ( 0 K or -273.15 °C) emits thermal radiation, much in the infrared portion of the EM spectrum. Many objects that are very hot emit thermal radiation that is in the visible and even the ultraviolet portion of the EM spectrum as well as the infrared, e.g. an incandescent light bulb or our local star that we call the Sun.

 What is invisible to humans, particularly when only thermal infrared is present, can be "seen" by a thermal imager, or more precisely, a thermal imaging camera, especially at night. It works in daylight, too, and one can easily see the surprising differences in appearance of any object from emitted thermal "light" to reflected visible light. pronounced when viewed in false colors.

Understand The House,

Know Your Home.™

 IR imaging “sees” objects differently! 

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