Ronchi-Hartmann type null screens for testing a plano-freeform surface with a detection plane inside a caustic surface

DelOlmo-Márquez, Jesús; Castillo-Santiago, Gabriel; Avendaño‐Alejo, Maximino; Moreno, Iván; Román‐Hernández, Edwin; López-Bautista, M. Carmen

doi:10.1364/oe.432007

Cited by 13 publications

(2 citation statements)

References 15 publications

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“…The inspection of pieces featuring a wide range of curvatures is a serious challenge even if the specular reflectance is uniform. If the object position is known, it may be possible in some cases to use inverse fringe or spot patterns (Pérard, 1995;Díaz-Uribe and Campos-García, 2000;Mai, 2007;Tosun et al, 2007;Werling and Beyerer, 2007;Liang et al, 2016;Campos-García et al, 2019;DelOlmo-Márquez et al, 2021;Huerta-Carranza et al, 2021). Of course, sharper changes in curvature over the surface necessitate tighter constraints on the position of the sample with respect to all degrees of freedom.…”

Section: Setup Geometry and Sizementioning

confidence: 99%

Deflectometry for specular surfaces: an overview

et al. 2023

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Deflectometry as a technique to assess reflective surfaces has now existed for some 40 years. Its different aspects and variations have been studied in multiple theses and research articles; reviews are available for certain subtopics. Still a field of active development with many unsolved problems, deflectometry now encompasses a large variety of application domains, hardware setup types, and processing workflows for different purposes, and spans a range from qualitative defect inspection of large vehicles to precision measurements of microscopic optics. Over these years, many exciting developments have accumulated in the underlying theory, in the systems design, and in the implementation specifics. This diversity of topics is difficult to grasp for experts and non-experts alike and may present an obstacle to a wider acceptance of deflectometry as a useful tool for research and industrial applications. This paper presents an attempt to summarize the status of deflectometry and to map relations between its notable branches. Its aim is to provide a communication basis for experienced practitioners and also to offer a convenient entry point for those interested in learning about the method. The list of references introduces some prominent trends and established research groups in order to facilitate further self-directed exploration.

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Section: Setup Geometry and Sizementioning

confidence: 99%

Deflectometry for specular surfaces: an overview

et al. 2023

View full text Add to dashboard Cite

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“…The inspection of pieces featuring a wide range of curvatures is a serious challenge even if the specular reflectance is uniform. If the object position is known, it may be possible in some cases to use inverse fringe or spot patterns [153,[167][168][169][340][341][342][343][344]. Of course, sharper changes in curvature over the surface necessitate tighter constraints on the position of the sample with respect to all degrees of freedom.…”

Section: Setup Geometry and Sizementioning

confidence: 99%

Deflectometry for specular surfaces: an overview

Burke¹,

Pak²,

Höfer³

et al. 2022

Preprint

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Deflectometry as a technical approach to assessing reflective surfaces has now existed for almost 40 years. Different aspects and variations of the method have been studied in multiple theses and research articles, and reviews are also becoming available for certain subtopics. Still a field of active development with many unsolved problems, deflectometry now encompasses a large variety of application domains, hardware setup types, and processing workflows designed for different purposes, and spans a range from qualitative defect inspection of large vehicles to precision measurements of microscopic optics. Over these years, many exciting developments have accumulated in the underlying theory, in the systems design, and in the implementation specifics. This diversity of topics is difficult to grasp for experts and nonexperts alike and may present an obstacle to a wider acceptance of deflectometry as a useful tool in other research fields and in the industry.This paper presents an attempt to summarize the status of deflectometry, and to map relations between its notable "spin-off" branches. The intention of the paper is to provide a common communication basis for practitioners and at the same time to offer a convenient entry point for those interested in learning and using the method. The list of references is extensive but definitely not exhaustive, introducing some prominent trends and established research groups in order to facilitate further selfdirected exploration by the reader.

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Evaluation of the aspherical surface of a plano–convex lens by refraction using an LCD

Huerta-Carranza,

Granados-Agustín,

Santiago-Alvarado

et al. 2024

Review of Scientific Instruments

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We present a simple method to evaluate the curved surface of a plano–convex aspheric lens using an incoherent light source. We implement an exact ray trace to obtain analytical expressions for designing a set of geometric objects, placed within a plane, to produce by refraction a regular array of either circles or straight lines in the plane of detection when the optical system under test works in accordance with the nominal design. An innovative geometrical test is implemented to calibrate the position of each element involved in the measurement system. As part of the calibration process, we considered that the camera lens can be affected by the distortion aberration; therefore, we proposed a straightforward method to compensate for the defects introduced in the experimental images. Finally, we used the measured values of the slopes to recover the shape of the surface under test using an iterative algorithm; as a result, we obtained the geometric parameters describing the surface with a percentage error less than 1.7%.

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Ronchi-Hartmann type null screens for testing a plano-freeform surface with a detection plane inside a caustic surface

Cited by 13 publications

References 15 publications

Deflectometry for specular surfaces: an overview

Deflectometry for specular surfaces: an overview

Deflectometry for specular surfaces: an overview

Evaluation of the aspherical surface of a plano–convex lens by refraction using an LCD

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