What is it?
Infrared is electromagnetic
radiation emitted by objects. Most objects unless at absolute zero, emit some
form of infrared radiation. It has longer wavelength than visible light, thus
it cannot be seen by a naked eye. Infrared Thermography is referred to
detecting this heat signatures of various objects through a infrared thermal
camera. The camera detects the infrared light emitted from various objects and
shows it as different colors (depending on the palette you choose). Colder
objects are shown darker and the hot objects shown lighter.
There is a great deal
of confusion in the minds of people about what a thermal image camera can or
cannot do. I would like to highlight few points here!
1. Infrared red camera
does not have an x-ray vision. It cannot see through walls or objects. There
have been instances when an Home Inspector was analyzing the house during Home Inspection and the people are scared and don't want to be in the field of view
fearing it can see through the clothing. Well, it does not have any such
ability. Again it does not have an x-ray vision.
2. The infrared camera
does not emit any radiation. It just a devise to detect the infrared heat
signatures emitted or reflected by any object.
3. It is not a magical
devise and require favourable conditions and great deal of skill and experience
to interpret the findings. Furthermore, the findings required to be
substantiated by moisture meter. There has been instances where due to lack of
experience and knowledge people have given wrong diagnosis. Believe me its very
easy to get excited and to be fooled by this devise. Always consult a
professional trained and experienced in both building construction and thermal
imaging for proper diagnosis.
4. It is not a digital
camera (few models have digital camera built in as additional feature). It only
detects the heat signatures emitted or reflected by the objects. Therefore, it
needs DELTA T which is the difference in temperature between the objects or
inside and outside of the building to display and work properly. When the
difference in temperature between inside and outside is very low or almost
equal it will not work properly.
Working with and operating
thermal camera and interpreting its images require great deal of skill and
experience. Its very easy to go wrong or arrive at the false diagnosis.
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