Thermography is the science of actually seeing heat. Thermal imaging cameras detect radiation in the infrared range of the electromagnetic spectrumFul...
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THERMOGRAPHY ABSTRACT Thermal imaging cameras detect radiation in the infrared range of the electromagnetic spectrum (roughly 9000 – 14,000 14,000 nanometers or 9 – 14 14 µm) and produce images of that radiation, called thermograms. Since infrared radiation is emitted by all objects near room temperature, according to the black body bod y radiation law, thermography makes it possible to see on e's environment with or without visible illumination. The amount of radiation emitted by an o bject increases with temperature; therefore, thermography allows one to see variations in temperature. When viewed through a thermal imaging camera, warm objects o bjects stand out well against cooler backgrounds; humans and other warm-blooded animals become easily visible against the environment, day or night. In order to perform the role of noncontact non contact temperature recorder, the camera will change chan ge the temperature of the object being viewed with its emissivity setting. Other algorithms can be used to affect the measurement, including the transmission ability of the transmitting medium (usually air) and the temperature of that transmitting medium. All these settings will affect the ultimate output for the temperature of the object being b eing viewed. This functionality makes the thermal imaging camera an excellent tool for the maintenance of electrical and mechanical systems in industry and commerce. INTRODUCTION
Thermography is the science of actually actuall y seeing heat. Thermal imaging cameras detect radiation in the infrared range of the electromagnetic electroma gnetic spectrum (roughly 9000 – 14,000 14,000 nanometers or 9 – 14µm) and produce images of that radiation, called thermograms. It is a method that provides information about heat distribution over any surface. A remote sensing technique is used in this method .It also used to detect air leakage, leaka ge, pathways, and insulation discontinuities. Infrared camera system can detect heat that would normally be invisible to the human eye and represent it as an image. The appearance and operation of a modern thermographic camera is often similar to a camcorder. Often the live thermogram reveals temperature te mperature variations so clearly that a photograph is not necessary for analysis. A recording module is therefore not always built-in. The CCD and CMOS sensors used for visible light cameras are sensitive only to the non thermal
part of the infrared spectrum called near-infrared (NIR). Thermal imaging cameras use specialized focal plane arrays (FPAs).
