IEVref: | 705-04-15 | ID: | |

Language: | en | Status: Standard | |

Term: | Rayleigh criterion | ||

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Definition: | a criterion which characterizes the degree of roughness of a surface, for a given grazing angle of an electromagnetic wave according to the value of the quantity: $\frac{h\mathrm{sin}\theta}{\lambda}$
where NOTE – In practice, roughness is negligible and the surface is considered specular if:
$\frac{h\mathrm{sin}\theta}{\lambda}<\frac{1}{100}$ | ||

Publication date: | 1995-09 | ||

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Internal notes: | 2017-06-02: Cleanup - Remove Attached Image 705-04-151.gif 2017-06-02: Cleanup - Remove Attached Image 705-04-152.gif | ||

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$\frac{h\mathrm{sin}\theta}{\lambda}$

where

*h* is the average height of the surface irregularities,

*θ* is the grazing angle relative to the average surface,

*λ* is the wavelength