Characterization of specular freeform surfaces from reflected ray directions using experimental ray tracing

Binkele, Tobias; Hilbig, David; Essameldin, Mahmoud; Henning, Thomas; Fleischmann, Friedrich; Lang, Walter

doi:10.5194/jsss-10-261-2021

Cited by 3 publications

(2 citation statements)

References 17 publications

(22 reference statements)

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“…For surfaces too complex to measure with the "inverse" setup, e.g., the so-called "wild aspherics" or free-form shapes, one can use point-scanning techniques. This approach is also known as "experimental ray tracing" (Häusler and Schneider, 1988;Binkele et al, 2021): a single, narrow, well-collimated (typically laser) beam probes a reflective surface in a scanning pattern and produces a grid of deflection measurements using the "direct" scheme of Figure 3A.…”

Section: Scanning Deflectometric Techniquesmentioning

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: Scanning Deflectometric Techniquesmentioning

confidence: 99%

Deflectometry for specular surfaces: an overview

et al. 2023

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“…the so-called "wild aspherics" or freeform shapes, one can use point-scanning techniques. This approach is also known as "experimental ray tracing" [50,51]: a single, narrow, well-collimated (typically laser) beam probes a reflective surface in a scanning pattern and produces a grid of deflection measurements using the "direct" scheme of Fig. 3(a).…”

Section: Scanning Deflectometric Techniquesmentioning

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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