Applications of Structured Light to 3D Surface Topography Using Moire Pattern and to 3D Imaging of Phase Objects

Date of Award

2021

Degree Name

M.S. in Electro-Optics and Photonics

Department

Department of Electro-Optics and Photonics

Advisor/Chair

Partha P. Banerjee

Abstract

Three-dimensional (3D) reconstruction plays an important role in imaging research filed. Structured light technology has been widely used in 3D imaging, recognition and measurement, indicating great industrial and commercial value. In this thesis, a simple and robust technique of Moiré topography with single-image capture and incorporating digital filtering along with a four-step digitally implemented phase-shifting method is introduced for 3D surface mapping. Feature details in the order of tens to hundreds of microns can be achieved using interferometrically generated structured light to illuminate the object surface. The feasibility of this technique is verified experimentally, and applications to metallic surfaces are demonstrated. Next, a simple non-interferometric incoherent light propagation model is introduced to perform 3D profiling of transparent objects with typical thicknesses in the order of mm to cm by analyzing the distorted captured image behind the object. A two-dimensional (2D) cosine fringe is used as the incident reference image, whose periodicity is markedly altered by the shape of the object. By monitoring the local change in the period, the surface profile is simulated and optimized to achieve minimal error with experimental data to determine the final morphology. Besides, core principles of ghost imaging and optical scan holography are also discussed.

Keywords

Optics, Electrical Engineering, Physics

Rights Statement

Copyright © 2021, author

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