Thermal imaging (Infrared thermography) is a technique that produces a visible graph or thermographic image of thermal energy radiated from objects. The human eye can only see the narrow middle band of visible light that encompasses all the colours of light in the rainbow. Thermography utilizes a portion of the infrared band of the electromagnetic spectrum between approximately 1 and 14 microns. Thermal infrared images translate the energy transmitted in the infrared wavelength into data that can be processed into a visible light spectrum video display. Thermal infrared imagers are detector and lens combinations that give a visual representation of infrared energy emitted by all objects. In other words thermal imagers let you “see” heat. Depending upon the sophistication used, thermography is capable of providing very detailed images of situations invisible to the naked eye. Thermal imaging thus finds its applications in different fields.