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Reference.org
Optical correlator
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<p>An optical correlator is an <a href="/facts/Optical_computer/aPl6UjC9">optical computer</a> for comparing two signals by utilising the <a href="/facts/Fourier_optics/H4bVRGYx">Fourier transforming properties of a lens</a>. It is commonly used in <a href="/facts/Optics/p0vq4S1T">optics</a> for target tracking and identification. </p>