17-1219

spectral linear absorption coefficient (at a point in an absorbing medium, for a collimated beam of radiation) [a(λ)]

quotient of the relative decrease caused by absorption of the spectral concentration of the radiant flux, Φe,λ,, of a collimated beam during its propagation along an elementary length, dl, at the point considered, by the length, dl

        

Unit: m-1

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