We found this very cool Thermal Imaging leaving in the McAuliffe-Shepard Discovery Center in Concord, New Hampshire. Of course we had to check it out! Thermography uses cameras to detect infrared radiation given off by an object. Infrared radiation is emitted by all objects based on their temperature, so the resulting image allows one to see variations in temperature.
What we see on a screen being fed from an infrared camera is a signal that has been converted to represent various brightnesses of electromagnetic radiation from within the infrared spectrum as various brightnesses of visible light. A range of wavelengths in the infrared spectrum are rendered with a corresponding wavelength of visible light. Just as with visible light, a particular wavelength of infrared light can vary in intensity.
The brighter colors of red, orange, yellow and white, indicate warmer temperatures. This means more heat and infrared radiation is emitted, while the purples and dark blue/black indicate cooler temperatures.
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