How Does Thermal Imaging Work?
Thermal
imagers are instruments that create pictures of heat rather than light. They
measure radiated IR energy and convert the data to corresponding maps of
temperatures. Today, instruments provide temperature data at each image pixel
and, typically, cursors can be positioned to each point with the corresponding
temperature read out on the screen or display. Images may be digitized, stored,
manipulated, processed and printed out.
All objects have a certain temperature and emit waves of
energy called infrared radiation. Hot objects emit more energy than cold
objects. A thermal imager translates these energy waves into a viewable image,
which shows a “heat picture” of a scene. The pictures above demonstrate the
difference between visable light what the naked eye can see and a thermal
image. Move your cursor over the images and you will notice the change between
the visable and thermal images.