aperture illumination

aperture illumination

[′ap·ə‚chər i‚lüm·ə′nā·shən]
(electromagnetism)
Field distribution in amplitude and phase over an aperture.
References in periodicals archive ?
2, below, this can be avoided by invoking the theory of partial coherence, or by negating the error in the first place by designing a diffraction experiment so that the aperture illumination is "almost" coherent.
Therefore, it may be desirable to avoid the need for these computations in the first place by designing diffraction experiments so that the aperture illumination will be "almost" coherent and the Fresnel integral (2) can still be used, in spite of the finite size of a given source.