= Geometric spreading in a moving-receiver diffraction measurement
{title2=$I(d)\propto\mathcal T[v(d)]/(d_1+d)^2$}
A diffraction-loss ratio is normalized to the unobstructed <intensity> at the same receiver position. With a <point source> that unobstructed <intensity> changes as inverse source–receiver distance squared. Moving the receiver can therefore decrease the transmission ratio while increasing its absolute received <intensity>. The two curves require separate <normalization>; a Cornu-chord plot alone omits geometric spreading.
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