Zobrazeno 1 - 10
of 240
pro vyhledávání: '"Servin, Manuel"'
We propose a least-squares phase-stepping algorithm (LS-PSA) consisting of only 14 steps for high-quality optical plate testing. Optical plate testing produces an infinite number of simultaneous fringe patterns due to multiple reflections. However, b
Externí odkaz:
http://arxiv.org/abs/2306.01082
One of the challenges in phase measuring deflectometry is to retrieve the wavefront from objects that present discontinuities or non-differentiable gradient fields. Here, we propose the integration of such gradients fields based on an Lp-norm minimiz
Externí odkaz:
http://arxiv.org/abs/2306.00252
We present a high-precision temporal-spatial phase-demodulation algorithm for phase-shifting interferometry (PSI) affected by random/systematic phase-stepping errors. Laser interferometers in standard optical-shops suffer from several error sources i
Externí odkaz:
http://arxiv.org/abs/1912.04841
We develop an error-free, nonuniform phase-stepping algorithm (nPSA) based on principal component analysis (PCA). PCA-based algorithms typically give phase-demodulation errors when applied to nonuniform phase-shifted interferograms. We present a stra
Externí odkaz:
http://arxiv.org/abs/1904.01071
Here we show how to design phase-shifting algorithms (PSAs) for nonuniform phase-shifted fringe patterns using their frequency transfer function (FTF). Assuming that the nonuniform/nonlinear (NL) phase-steps are known, we introduce the desired zeroes
Externí odkaz:
http://arxiv.org/abs/1811.02020
Standard phase-stepping algorithms (PSAs) estimate the measuring phase of linear carrier temporal-fringes with respect to a linear-reference. Linear-carrier fringes are normally obtained using feedback, closed-loop, optical phase-shifting devices. On
Externí odkaz:
http://arxiv.org/abs/1808.06551
Publikováno v:
In Optics and Lasers in Engineering November 2022 158
Autor:
Servin, Manuel, Padilla, Moises
Optical phase-modulated fringe-patterns are usually digitized with XxY pixels and 8 bits/pixel (or higher) gray-levels. The digitized 8 bits/pixel are raw-data bits, not Shannon information bits. Here we show that noisy fringe-patterns store much les
Externí odkaz:
http://arxiv.org/abs/1710.00623
Publikováno v:
Opt. Express 25(19), 22292-22302 (2017)
A phase-demodulation method for digital fringe-projection profilometry using the spatial and temporal Nyquist frequencies is presented. It allows us to digitize tridimensional surfaces using the highest spatial frequency ({\pi} radians per pixel) and
Externí odkaz:
http://arxiv.org/abs/1706.08592
Publikováno v:
Optics and Lasers in Engineering 106, Pages 68-74, July 2018
From 1971 to 2012 dual-wavelength optical-metrology used only the demodulated low-sensitivity phase-difference of two close-sensitive fringes. Dual-wavelength phase-metrology that additionally uses the phase-sum was first reported by Di et al. in 201
Externí odkaz:
http://arxiv.org/abs/1706.04039