Cone array of Fourier lenses for contouring applications

Ervin Goldfain

doi:10.1117/12.48651

1 December 1991 Cone array of Fourier lenses for contouring applications

Ervin Goldfain

Proceedings Volume 1527, Current Developments in Optical Design and Optical Engineering; (1991) https://doi.org/10.1117/12.48651
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

An application of Fourier transform lenses to surface topography detection is investigated. The field is illuminated in parallel using an array of three different wavelength laser diodes, and relative phase alteration is read out between cross-correlated electronic pixels. Diffraction theory of image formation is used to interpret the modulation in contrast. Speckle sensitivity to wavelength provides the basic technique for noise filtering.

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Ervin Goldfain "Cone array of Fourier lenses for contouring applications", Proc. SPIE 1527, Current Developments in Optical Design and Optical Engineering, (1 December 1991); https://doi.org/10.1117/12.48651

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KEYWORDS

Lenses

Sensors

Optical design

Fourier transforms

Linear filtering

Optical engineering

Speckle

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