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| | The title of the author is Figures. Puerto Rico is exactly where he and his wife live. One of the extremely best issues in the globe for him is to gather badges but he is having difficulties to find time for it. I am a meter reader.<br><br>my web page; [http://simple-crafts.com/groups/best-techniques-for-keeping-yeast-infections-under-control/ home std test kit] |
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| '''Optical Cross Section''' or OCS is a value which describes the maximum amount of [[optical flux]] reflected back to the source. The standard unit of measurement is <math>\frac{m^2}{sr}</math>. It is dependent on the geometry and the reflectivity at a particular [[wavelength]] of an object. Optical cross section is useful in fields such as [[LIDAR]]. In the field of [[Radar]] this is referred to [[Radar Cross Section]]. Objects such as [[license plates]] on automobiles have a high optical cross section to maximize the laser return to the [[speed detector gun]].
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| ==Flat mirror==
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| Optical cross section of a flat mirror with a given reflectivity at a particular wavelength <math>r(\lambda)</math> can be express by this formula.
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| <math>
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| \mbox{OCS}=r(\lambda) \frac{D^4}{1.4876 \lambda^2}
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| </math>
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| Where <math>D</math> is the cross sectional diameter of the beam. Note that the direction of the light has to be perpendicular to the mirror surface for this formula to be valid, else the return from the mirror would no longer go back to it source.
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| In order to maximize the return a [[corner reflector]] is used. The alignment of a corner reflector with respect to the source is not as critical as the alignment of a flat mirror.
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| ==Other optical devices==
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| Optical cross section is not limited to reflective surfaces. Optical devices such as telescopes and cameras will return some of the optical flux back to the source, since it has optics that reflect some light. The Optical cross section of a camera can vary over time due to the camera shutter opening and closing.
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| ==See also==
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| * [[Radar cross-section]]
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| {{DEFAULTSORT:Optical Cross Section}}
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| [[Category:Optics]]
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Latest revision as of 06:02, 5 September 2014
The title of the author is Figures. Puerto Rico is exactly where he and his wife live. One of the extremely best issues in the globe for him is to gather badges but he is having difficulties to find time for it. I am a meter reader.
my web page; home std test kit