Advances on Talbot projection profilometry

Rodrı́guez-Vera, Ramón; Rayas, J. A.; Mendoza-Santoyo, Fernando; Aranda, Alfredo; Rastogi, Pramod K.; Hack, Erwin

doi:10.1063/1.3426151

Cited by 2 publications

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“…e distance between the object and the LC-SLM is 6 times the Talbot distance (27.31 cm). Using the method proposed by Pan [29], the parameter k is determined to be 1.77 μm/pixel.…”

Section: Resultsmentioning

confidence: 99%

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Simultaneous Measurement of In-Plane and Out-of-Plane Displacements Using Talbot Fringe Projection

Sun

2020

International Journal of Optics

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The fringe projection technique has been widely used in optical measurements. In this paper, we demonstrate a scheme to measure the 3D displacement of a deformed sample using Talbot fringe projection. In this process, we designed a two-dimensional square Talbot hologram. In this approach, we used the basic principle of triangulation, and a computer-controlled liquid crystal spatial light modulator (LC-SLM) was placed in the optical path. The Talbot array hologram was displayed on the LC-SLM screen and projected onto the surface of a sample. Two patterns were recorded: one before and one after deformation. We simultaneously acquired the in-plane and out-of-plane displacements using the digital image correlation (DIC) method. This scheme is simple and easily implemented. Theoretical and experimental results are presented.

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“…e distance between the object and the LC-SLM is 6 times the Talbot distance (27.31 cm). Using the method proposed by Pan [29], the parameter k is determined to be 1.77 μm/pixel.…”

Section: Resultsmentioning

confidence: 99%

“…Based on the encoding of the target surface by a Talbot self-image of a linear grating, Rodriguez-Vera et al used Talbot-projected fringes to determine the 3D contouring of a diffuse target [28]. ey measured the uniform pressure loaded on a clamped latex using Talbot projection profilometry [29].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Measurement of In-Plane and Out-of-Plane Displacements Using Talbot Fringe Projection

Sun

2020

International Journal of Optics

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Surface profilometry using the incoherent self-imaging technique in reflection mode

Hassani

Nahal

Tirandazi

2018

Journal of Applied Physics

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In this paper, we introduce a highly sensitive and cost-effective surface profilometry technique based on the Lau self-imaging phenomenon in reflection mode, combined with the Moiré technique. Standard incoherent grating imaging with two Ronchi rulings is deployed to produce localized Fresnel pseudoimages, except that the light wavefront gets modulated after reflecting off the surface under test and before the final image forms. A third grating is superimposed on the pseudoimage to take advantage of the magnification property of the Moiré fringes and enhance the surface-induced modulations. A five-step phase-shifting technique is used to extract the 2D surface profile of the sample from the recorded Moiré patterns. To demonstrate our technique, we measure the profile of a 250 nm step-like metallic sample. The results show a few nanometer uncertainties, very good reproducibility, and agreement with other known optical and mechanical surface profilometry methods.

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Advances on Talbot projection profilometry

Cited by 2 publications

References 0 publications

Simultaneous Measurement of In-Plane and Out-of-Plane Displacements Using Talbot Fringe Projection

Simultaneous Measurement of In-Plane and Out-of-Plane Displacements Using Talbot Fringe Projection

Surface profilometry using the incoherent self-imaging technique in reflection mode

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