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IEVref:705-04-15ID:
Language:enStatus: 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:

hsinθ λ MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbba9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meqabaGacmGadiWaaiWabiabciaafiaakeaadaWcaaqaaiaadIgaciGGZbGaaiyAaiaac6gacqaH4oqCaeaacqaH7oaBaaaaaa@40D1@

where
h is the average height of the surface irregularities,
θ is the grazing angle relative to the average surface,
λ is the wavelength

NOTE – In practice, roughness is negligible and the surface is considered specular if:

hsinθ λ < 1 100 MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbba9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9q8qiLsFr0=vr0=vr0db8meqabaGacmGadiWaaiWabiabciaafiaakeaadaWcaaqaaiaadIgaciGGZbGaaiyAaiaac6gacqaH4oqCaeaacqaH7oaBaaGaeyipaWZaaSaaaeaacaGGXaaabaGaaiymaiaaccdacaGGWaaaaaaa@44B7@


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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