Manufacturing and measurement of freeform optics

Fang, Fengzhou; Zhang, X.D.; Weckenmann, Albert; Zhang, G.X.; Evans, C. J.

doi:10.1016/j.cirp.2013.05.003

Cited by 703 publications

(279 citation statements)

References 179 publications

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“…Magnetorheological fluid-based finishing (MRFF) tool was developed for finishing complex freeform surfaces [134]. According to the literature, nanoscale level surface roughness could be achieved in complex freeforms through MRFF [116].…”

Section: Polishingmentioning

confidence: 99%

State of the art of bioimplants manufacturing: part I

Kang

Fang

2018

Adv. Manuf.

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Bioimplants are becoming increasingly important in the modern society due to the fact of an aging population and associated issues of osteoporosis and osteoarthritis. The manufacturing of bioimplants involves an understanding of both mechanical engineering and biomedical science to produce biocompatible products with adequate lifespans. A suitable selection of materials is the prerequisite for a long-term and reliable service of the bioimplants, which relies highly on the comprehensive understanding of the material properties. In this paper, most biomaterials used for bioimplants are reviewed. The typical manufacturing processes are discussed in order to provide a perspective on the development of manufacturing fundamentals and latest technologies. The review also contains a discussion on the current measurement and evaluation constraints of the finished bioimplant products. Potential future research areas are presented at the end of this paper.

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Section: Polishingmentioning

confidence: 99%

State of the art of bioimplants manufacturing: part I

Kang

Fang

2018

Adv. Manuf.

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“…Therefore, it is a must to track form deviations all the way from the design phase up to the operational phase and evaluate form defects owing to manufacturing. With the advance of technology and ultra-precise manufacturing capabilities [1,2], design specifications have become more and more challenging, reaching a nanometric scale of precision. While current techniques allow for manufacturing arbitrary optical surfaces and provide correction at the nanometer scale, high precision measurement of optical surfaces as well as data processing is still a challenge in industry.…”

Section: Introductionmentioning

confidence: 99%

“…It aims at developing methods for high-precision measurement of aspherical optics and characterizing their surface form. A recent and exhaustive research on the processing and manufacturing of aspherical and freeform optics is found in [1]. The LNE's high-precision profilometer, the Zeiss F25, the CMM, the NANOMEFOS and the ISARA400 measuring machines achieve ultra-high-precision positioning and measurement on aspherical artifacts as described in [4].…”

Section: Introductionmentioning

confidence: 99%

A new method for aspherical surface fitting with large-volume datasets

El-Hayek

Nouira

Anwer

et al. 2014

Precision Engineering

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. a b s t r a c tIn the framework of form characterization of aspherical surfaces, European National Metrology Institutes (NMIs) have been developing ultra-high precision machines having the ability to measure aspherical lenses with an uncertainty of few tens of nanometers. The fitting of the acquired aspherical datasets onto their corresponding theoretical model should be achieved at the same level of precision. In this article, three fitting algorithms are investigated: the Limited memory-Broyden-Fletcher-Goldfarb-Shanno (L-BFGS), the Levenberg-Marquardt (LM) and one variant of the Iterative Closest Point (ICP). They are assessed based on their capacities to converge relatively fast to achieve a nanometric level of accuracy, to manage a large volume of data and to be robust to the position of the data with respect to the model. Nevertheless, the algorithms are first evaluated on simulated datasets and their performances are studied. The comparison of these algorithms is extended on measured datasets of an aspherical lens. The results validate the newly used method for the fitting of aspherical surfaces and reveal that it is well adapted, faster and less complex than the LM or ICP methods.

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“…Also, elements for more complex irradiance patterns can be constructed by mathematical equations, mapping, or beam-shaping algorithms. [3][4][5] Common examples are Gauss-to-top-hat beam shapers or freeform illumination reflectors for various applications. 6,7 However, real-world physical light sources exhibit a finite area-angle product, corresponding to a finite etendue.…”

Section: Introductionmentioning

confidence: 99%

Illumination design for extended sources based on phase space mapping

et al. 2017

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Abstract. Illumination design usually requires the shaping of a specific irradiance distribution from a given light source. For point-like sources or collimated laser beams various methods exist to construct the shape of the refractive and/or reflective surfaces within the optical system. However, for extended sources, an additional feedback or optimization loop is usually required and limitations are not clear. We propose an analysis and design method that includes the source extension from the very beginning. The method is based on phase space mapping of the source radiance distribution onto the target irradiance distribution. We illustrate the method with several examples. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Manufacturing and measurement of freeform optics

Cited by 703 publications

References 179 publications

State of the art of bioimplants manufacturing: part I

State of the art of bioimplants manufacturing: part I

A new method for aspherical surface fitting with large-volume datasets

Illumination design for extended sources based on phase space mapping

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