The Use of Aerial Infrared Thermography to Compare the Thermal Resistances of Roofs (Classic Reprint) - Softcover

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Excerpt from The Use of Aerial Infrared Thermography to Compare the Thermal Resistances of Roofs

In conducting an aerial infrared survey, an infrared line scanning system mounted in an aircraft scans the terrain, building up a thermal image as the aircraft progresses along a flight line, as shown in figure 1. The scanner is basically an optical telescope, with its narrow field of view continuously redirected by a spinning flat mirror. The mirror causes the system to scan in a plane perpendicular to the direction of flight of the aircraft. Such systems have one or more cryogenically cooled thermal radiation detectors in the focal plane of the telescope which convert the focused thermal energy received by the detector into an electrical signal. This electrical signal can be processed into a visual image on a cathode-ray tube (crt) which can be photographically recorded or digitized and recorded on a magnetic tape recorder for future processing.

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