Abstract
An optical Fourier transforming system is used to produce the transform of a one-dimensional signal recorded as a transparent oscillogram on an opaque screen. If the tracing is illuminated with light whose amplitude varies linearly perpendicular to the tracing axis, then the exact transform is obtained along one axis of the output plane. Spectra with small error terms are obtained by superimposing a phase plate, or a knife edge or a special binary mask over the line tracing. The theory of the methods is presented and verified experimentally. Multichannel operation is demonstrated.
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