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Chapter 12:
Thermal Imaging Lenses
In the infrared (IR) region of the spectrum, there are two atmospheric wavelength bands, or “windows,” where the absorption due to atmospheric gases is low. One is from about 3 to 5 μm, the other from about 8 to 12 μm. An important difference between design in the visible and in the IR is that in the visible, objects are almost always detected by the light that they reflect; whereas in the IR region, objects are detected by the radiation that they emit.
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