Infrared thermography

Description

A technique that measures temperature variations of an object or area. Infrared thermography is used to evaluate cool and warm air pockets in a room as well as to pinpoint heat loss locations. It can be also used to detect voids or delaminations in solid structures. To detect voids, the back surface of an object (wood, ceramic, metal, plaster, etc.) is cooled or heated while the front surface is monitored by infrared thermography. Because air has low thermal conductivity, air pockets will transmit heat differently than surrounding materials that are contiguous. This results in cool or warm areas on the surface that correspond to the voids. Photographic film or, more typically, an infrared camera (radiometer) is used to detect the temperature variations. Radiometers are very sensitive and can detect variations of 0.2C. The resultant image is called a thermogram. False colors are often used to enhance the temperature variations.

Synonyms and Related Terms

thermographie infrarouge (Fr.); Infrarot Thermographie (Deut.)

Additional Information

B.F.Miller, "The Feasibility of Using Thermography to Detect Subsurface Voids in Painted Wooden Panels" JAIC 16(2):27-35, 1977.