Nonimaging optical methods for measuring Fourier components of moving incoherently illuminated objects

William T. Rhodes; Gisele Welch; Hakan Urey

doi:10.1117/12.308866

22 May 1998 Nonimaging optical methods for measuring Fourier components of moving incoherently illuminated objects

William T. Rhodes, Gisele Welch, Hakan Urey

Proceedings Volume 3490, Optics in Computing '98; (1998) https://doi.org/10.1117/12.308866
Event: Optics in Computing '98, 1998, Bruges, Belgium

Abstract

The spatial-frequency analysis of moving objects usually involves freeze-frame imaging followed by post-detection digital processing. We present principles that allow real- time non-imaging methods for measuring the spatial frequency content of an incoherently-illuminated moving object. A theoretical basis is provided by the Van Cittert-Zernike theorem, which states that the mutual intensity of the light from a planar object is governed by the spatial Fourier transform of the optical intensity distribution associated with the object. The objective of systems described in this paper is to convert the mutual intensity of the wave field incident on a plane into useful signal information. Basic concepts are presented and some practical considerations discussed.

Citation Download Citation

William T. Rhodes, Gisele Welch, and Hakan Urey "Nonimaging optical methods for measuring Fourier components of moving incoherently illuminated objects", Proc. SPIE 3490, Optics in Computing '98, (22 May 1998); https://doi.org/10.1117/12.308866

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