Radiative Heat Transfer

Radiative Heat Transfer

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Credit: GIPHOTOSTOCK/SCIENCE PHOTO LIBRARY

Caption: Radiative heat transfer (thermogram). Shown here is a thermogram of an incandescent lamp shining on a surface whose left half is black while the right half is white. Radiative energy heats up the surface thus raising its temperature. Because the black half absorbs more radiation, its temperature increase is greater than that of the white half. Thermography is a technique for visualizing the temperature of objects by recording the thermal emission intensity at long infrared wavelengths. This image was acquired with a specialized camera that uses a focal-plane array of vanadium oxide microbolometers as a sensor. It is sensitive to electromagnetic radiation in the wavelength range of 8 to 14 micron. The camera produces a 320x240-pixel image where different colors correspond to different temperatures.

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Keywords: bulb, demonstration, energy, energy transfer, heat, heat radiation, heat transfer, heating, imaging, incandescent, infrared, ir, lamp, light, lightbulb, physics, radiation, radiative, temperature, thermal, thermal radiation, thermogram, thermograph, thermography

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