Phase measuring deflectometry for determining 5 DOF misalignment of segmented mirrors

Davies, Angela; Vann, Trent; Evans, Christopher J.; Butkiewicz, Mark

doi:10.1117/12.2276947

Cited by 7 publications

(4 citation statements)

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“…Today, different versions of DM are employed in a wide range of applications such as industrial quality control for household items, mobile phones, automotive parts (Lippincott and Stark, 1982;Höfling et al, 2000;Skydan et al, 2007;Armesto et al, 2011;Arnal et al, 2017;Molina et al, 2017;Zhou et al, 2019), reflective sheet, rod, or tape materials (Hung and Shang, 2003;Caulier et al, 2008;Sárosi et al, 2010), Fresnel lenses , solar concentrator mirrors (Arqueros et al, 2003;Fontani et al, 2005;Heimsath et al, 2008;Scott and Burgess, 2010;Wang et al, 2010;Ulmer et al, 2011;Campos-García et al, 2015a;El Ydrissi et al, 2019), and even astronomical and synchrotron mirrors of various sizes (Parks et al, 2011;Schulz et al, 2011;Su et al, 2012a;Su et al, 2012b;Su P. et al, 2013;Hofbauer et al, 2013;Burge et al, 2014;Olesch et al, 2014;Oh et al, 2016;Davies et al, 2017;Wu et al, 2022). We have last summarized the state of the art over a decade ago (Werling et al, 2009;Balzer and Werling, 2010); driven by applications, the discipline has seen many exciting advances since then.…”

Section: Figurementioning

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: Figurementioning

confidence: 99%

Deflectometry for specular surfaces: an overview

et al. 2023

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“…They used the large binocular telescope null corrector as a system under test to demonstrate the feasibility of deflectometry in alignment. Davies et al [14] conducted simulation work using phase-measuring deflectometry. They employed an empirical approach to analyzing distorted fringe images of freeform optics to track misalignment directly.…”

Section: Conventional Deflectometrymentioning

confidence: 99%

Comparing novel and conventional methods for optical system alignment using deflectometry

Yoo,

Dubin

2023

Optomechanical Engineering 2023

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This paper compares two different ways of aligning optical systems using deflectometry: a novel method incorporating the sine condition test and deflectometry, and conventional multi-field points measuring deflectometry. The study aims to provide experimental evidence that the novel method is effective and has advantages over the conventional method. The experiment was carried out using a singlet as the unit-under-test with visible deflectometry composed of a camera and a monitor. In the conventional approach, the camera is moved to multiple field points to measure transmitted wavefront aberrations. For the accurate measurement of the aberrations, accurate knowledge of the camera positions is desired for conventional deflectometry. In the novel approach, the camera is fixed at an on-axis field point, while the monitor is moved to at least two positions in the longitudinal direction. Even if the camera is fixed, the new method can derive the linear behavior of aberrations over the field as it measures pupil mapping error and slope mapping error instead of wavefront error directly. Also, it is insensitive to positional errors in the monitor. This is made possible by discovering the complementary aspects of the sine condition test and deflectometry. We emphasize that the new alignment method is not performing two independent tests separately. The test can be done via one test setup requiring a camera and a monitor equivalent to a deflectometry system. The results demonstrate the benefits of the novel alignment method, which eliminates the need for accurate control of the test instrument movement during the alignment process.

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“…Large misalignments in telescope applications limits the interferometric tracking. PMD was used to determine the 5 degrees of freedom of misalignment in telescope segmented mirrors [223]. PMD has distinct advantages such as full-field, automatic data-processing, high precision, large dynamic range [224,225].…”

Section: Non-contact Freeform Metrologymentioning

confidence: 99%

Advances in the design and manufacturing of novel freeform optics

Kumar

Tong

Jiang

2022

Int. J. Extrem. Manuf.

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Freeform optics has become the most prominent element of the optics industry. Advanced freeform optical designs supplementary to ultra-precision manufacturing and metrology techniques have upgraded the lifestyle, thinking, and observing power of existing humans. Imaginations related to space explorations, portability, accessibility have also witnessed sensible in today’s time with freeform optics. Present-day design methods and fabrications techniques applicable in the development of freeform optics and the market requirements are focussed and explained with the help of traditional and non-traditional optical applications. Over the years, significant research is performed in the emerging field of freeform optics, but no standards are established yet in terms of tolerances and definitions. We critically review the optical design methods for freeform optics considering the image forming and non-image forming applications. Numerous subtractive manufacturing technologies including figure correction methods and metrology have been developed to fabricate extreme modern freeform optics to satisfy the demands of various applications such as space, astronomy, earth science, defence, biomedical, material processing, surveillance, and many more. We described a variety of advanced technologies in manufacturing and metrology for novel freeform optics. Next, we also covered the manufacturing-oriented design scheme for advanced optics. We conclude this review with an outlook on the future of freeform optics design, manufacturing and metrology.

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Phase measuring deflectometry for determining 5 DOF misalignment of segmented mirrors

Cited by 7 publications

References 0 publications

Deflectometry for specular surfaces: an overview

Deflectometry for specular surfaces: an overview

Comparing novel and conventional methods for optical system alignment using deflectometry

Advances in the design and manufacturing of novel freeform optics

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