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8 Cards in this Set
- Front
- Back
- 3rd side (hint)
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IR energy possesses which properties in common with visible light? |
Refraction, Reflection, Absorption |
There are three |
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In what band of wavelengths are your systems designed to operate? Why? |
8-14 micron, because they are less attenuated by the atmosphere. |
Far region of IR frequencies (7-1000 microns) |
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What are the laws (that apply to our IR systems) that govern the behavior of IR? |
- Wien's displacement law - Stefan-Boltzmann law - Kirchhoff's law |
There are three. |
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What is the ratio of the radiation of any specific substance to that of an equivalent black body. |
Emissivity Factor |
It is always less than 1. |
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What is the theoretical body, that if existed, would absorb the entire radiation incidwnt upon it and reflect none? |
Black Body |
Its absorptivity would be 100 percent and its reflectivity would be zero. |
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The amount if IR energy is directly porportional to what? |
The fourth power of the object absolute temperature. |
Equation |
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Which objects can IR energy be transmitted through but are opaque to visible energy? |
Silicon amd Germanium |
Covert windows and fake boobs. |
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Wien's displacement law states what? |
The wavelength at which peak radiation occurs is equal to a constant divided by the absolute temperature of the substance in degree Kelvin. (Any increase in temperature shifts the wavelength of peak radiation toward the shorter wavelengths.) |
Wavelength=constant/temperature |
