Discussion the effect of non-collimated light path on moiré deflectometry based on diffraction theory
Sign Up to like & getrecommendations! Published in 2021 at "Optics and Lasers in Engineering"
DOI: 10.1016/j.optlaseng.2021.106643
Abstract: Abstract In this paper, the effect of non-collimated light path on moire deflectometry is studied based on scalar diffraction theory. The complex amplitude of non-collimated light path is initially deduced, which shows it has a… read more here.
Keywords: effect; light path; deflectometry; collimated light ... See more keywords
Single-shot deflectometry for dynamic 3D surface profile measurement by modified spatial-carrier frequency phase-shifting method
Sign Up to like & getrecommendations! Published in 2019 at "Scientific Reports"
DOI: 10.1038/s41598-019-39514-6
Abstract: We propose a new concept of single-shot deflectometry for real-time measurement of three-dimensional surface profile using a single composite pattern. To retrieve an accurate phase from one-frame composite pattern, we adapt the Fourier Transform (FT)… read more here.
Keywords: deflectometry; method; single shot; measurement ... See more keywords
Wavefront reconstruction of discontinuous phase objects from optical deflectometry
Sign Up to like & getrecommendations! Published in 2023 at "Applied Optics"
DOI: 10.1364/ao.484377
Abstract: 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… read more here.
Keywords: phase objects; reconstruction discontinuous; wavefront reconstruction; discontinuous phase ... See more keywords
Ronchi and Moiré patterns for testing spherical and aspherical surfaces using deflectometry.
Sign Up to like & getrecommendations! Published in 2018 at "Applied optics"
DOI: 10.1364/ao.57.009963
Abstract: The aim of this paper is to compare the Ronchi test and the Moiré deflectometry applied to a new pattern. To do so, we used two Ronchi patterns (typical Ronchigrams) produced by two identical Ronchi… read more here.
Keywords: deflectometry; testing spherical; ronchi moir; patterns testing ... See more keywords
Infinite deflectometry enabling 2π-steradian measurement range.
Sign Up to like & getrecommendations! Published in 2019 at "Optics express"
DOI: 10.1364/oe.27.007602
Abstract: We present a novel deflectometry implementation termed Infinite Deflectometry. The technique provides a full aperture surface reconstruction sag map of freeform surfaces, including previously challenging to measure optics such as highly convex surfaces. The method… read more here.
Keywords: infinite deflectometry; measurement range; deflectometry; steradian measurement ... See more keywords
Hand-guided qualitative deflectometry with a mobile device.
Sign Up to like & getrecommendations! Published in 2020 at "Optics express"
DOI: 10.1364/oe.383475
Abstract: We introduce a system that exploits the screen and front-facing camera of a mobile device to perform three-dimensional deflectometry-based surface measurements. In contrast to current mobile deflectometry systems, our method can capture surfaces with large… read more here.
Keywords: mobile device; deflectometry; surface measurements; hand guided ... See more keywords
Front and back surface measurement of the transparent planar element based on multi-frequency fringe deflectometry.
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DOI: 10.1364/oe.470304
Abstract: As a highly accurate metrology, phase measuring deflectometry (PMD) can be used for in-situ surface shape measurement. However, due to the reflection off the back surface, PMD cannot measure both the front and back surfaces… read more here.
Keywords: planar element; transparent planar; deflectometry; front back ... See more keywords
Improved methods of binocular phase measuring deflectometry.
Sign Up to like & getrecommendations! Published in 2022 at "Optics letters"
DOI: 10.1364/ol.474923
Abstract: Phase measurement deflectometry (PMD) is an excellent method for high-precision optical surface measurement; through the simple system structure, accuracy comparable to that of interference methods can be realized. The key of PMD is to solve… read more here.
Keywords: system; accuracy; deflectometry; pmd ... See more keywords
Digital filtering of ghost signal in phase measuring deflectometry.
Sign Up to like & getrecommendations! Published in 2023 at "Optics letters"
DOI: 10.1364/ol.485459
Abstract: We introduce a method of geometric screen modification to remove ghost reflections commonly observed in deflectometry optical testing. The proposed method modifies the optical layout and illumination source area to bypass the generation of reflected… read more here.
Keywords: filtering ghost; ghost signal; signal phase; deflectometry ... See more keywords