Photorefractive Fourier transform profilometer for the measurement of 3-D object shapes

Oliveira, G. N. de; Oliveira, Maria Elizabete de; Santos, P. A. M. dos

doi:10.1016/j.optcom.2012.06.083

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…Dynamic moiré-like pattern production using photorefraction has been proposed [9] as a quite promising procedure that could be used in interferometric applications. Recently, it was applied to a real time fringe projection process, and an optical profile determination was successfully generated through the use of a Fourier transformation technique [10].…”

Section: Introductionmentioning

confidence: 99%

Digital holographic moiré-like patterns and an application to Fourier transform profilometry

Oliveira

Freire

et al. 2015

Optics Communications

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Section: Introductionmentioning

confidence: 99%

Digital holographic moiré-like patterns and an application to Fourier transform profilometry

Oliveira

Freire

et al. 2015

Optics Communications

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Generation and practical controlling of adaptative structured photorefractive moiré patterns for optical metrology applications

Glória,

de Oliveira,

dos Santos

2024

Appl. Opt.

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This paper provides a comprehensive account of the generation and control of dynamic structured moiré patterns produced holographically in straightforward laboratory procedures. The process entails superimposing sinusoidal gratings on the Bi12TiO20 (BTO) photorefractive crystal as the dynamic holographic medium. We will provide a detailed account of the straightforward optical procedures and instrumental operations that facilitate the generation of these patterns with convenient geometries. Some of the notable applications that have already been demonstrated include profilometry and numerical representation, while others, such as structured illumination microscopy (SIM), are still under development.

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Photorefractive moiré-like patterns for the multifringe projection method in Fourier transform profilometry

Oliveira

Souza

et al. 2016

Appl. Opt.

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In the present paper, the method of simultaneous moiré-like fringe pattern projection for Fourier transform profilometry is described. The photorefractive holographic interferometric process produces controlled moiré-like patterns with two or more different variation directions. Each low spatial frequency fringe pattern is experimentally obtained as a result of the superposition of two high spatial frequency sinusoidal gratings, with slightly different pitches, for each fringe variation direction. These dynamic moiré-like patterns are induced due to an optical holographic beating of the sinusoidal induced gratings in the volume of the photorefractive Bi₁₂TiO₂₀ (BTO) crystal sample used as dynamic holographic medium. Two or more moiré-like fringe patterns, with at least two different variation directions, simultaneously (or not), are projected onto the object surface. Thus, this is the 2D fringe projection stage of our proposed Fourier transform procedure to determine the profile of a simple object.

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Photorefractive Fourier transform profilometer for the measurement of 3-D object shapes

Cited by 4 publications

References 9 publications

Digital holographic moiré-like patterns and an application to Fourier transform profilometry

Digital holographic moiré-like patterns and an application to Fourier transform profilometry

Generation and practical controlling of adaptative structured photorefractive moiré patterns for optical metrology applications

Photorefractive moiré-like patterns for the multifringe projection method in Fourier transform profilometry

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