20 January 2020 Shape defect measurement by fringe projection profilometry and phase-shifting algorithms
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Abstract

We propose a fringe-projection profilometry technique for shape defects measurement, which can be employed for three-dimensional (3-D) quality inspection. The proposal consists of using a template surface to design phase-shifting algorithms with special-purpose phase response via the frequency transfer function. These algorithms can jointly and directly estimate the spatial phase deviations in a 3-D inspection. Phase deviations correspond to shape differences between the template shape and a testing one. The phase-unwrapping procedure is unnecessary when phase differences are small, as is usual in quality inspections. Experimental results show that our technique is so sensitive that the ripples in a fingerprint can be retrieved.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2020/$28.00 © 2020 SPIE
Sotero Ordoñes Nogales, Manuel Servin, Moises Padilla, Ivan Choque, Jorge L. Flores Nuñez, and Antonio Muñoz "Shape defect measurement by fringe projection profilometry and phase-shifting algorithms," Optical Engineering 59(1), 014107 (20 January 2020). https://doi.org/10.1117/1.OE.59.1.014107
Received: 2 September 2019; Accepted: 27 December 2019; Published: 20 January 2020
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Cited by 8 scholarly publications.
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KEYWORDS
Fringe analysis

Phase shifts

Cameras

Inspection

Optical engineering

Modulation

Projection systems

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