Precision Optics Manufacturing最新文献_第8页

Machine learning robot polishing cell 机器学习机器人抛光细胞

Precision Optics Manufacturing Pub Date : 2019-06-28 DOI: 10.1117/12.2525529

M. Schneckenburger, Luis Garcia, R. Boerret

{"title":"Machine learning robot polishing cell","authors":"M. Schneckenburger, Luis Garcia, R. Boerret","doi":"10.1117/12.2525529","DOIUrl":"https://doi.org/10.1117/12.2525529","url":null,"abstract":"The quality of optical components such as lenses or mirrors can be described by shape errors and surface roughness. With increasing optic sizes, the stability of the polishing process becomes more and more important. Parameters such as chemical stability of the slurry or tool wear are key elements for a deterministic computer controlled polishing (CCP) process. High sophisticated CCP processes such as magnetorheological finishing (MRF) or the ZEEKO bonnet polishing process rely on the stability of the relevant process parameters for the prediction of the desired material removal. Aim of this work is to monitor many process-relevant parameters by using sensors attached to the polishing head and to the polishing process. Examples are a rpm and a torque sensor mounted close to the polishing pad, a vibration sensor for the oscillation of the bearings, as well as a tilt sensor and a force sensor for measuring the polishing pressure. By means of a machine learning system, predictions of tool wear and the related surface quality shall be made. Goal is the detection of the critical influence factors during the polishing process and to have a kind of predictive maintenance system for tool path planning and for tool change intervals.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115806224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Monte Carlo simulations: a tool to assess complex measurement systems 蒙特卡罗模拟:一种评估复杂测量系统的工具

Precision Optics Manufacturing Pub Date : 2019-06-28 DOI: 10.1117/12.2526799

A. Harsch, C. Pruss, G. Baer, W. Osten

{"title":"Monte Carlo simulations: a tool to assess complex measurement systems","authors":"A. Harsch, C. Pruss, G. Baer, W. Osten","doi":"10.1117/12.2526799","DOIUrl":"https://doi.org/10.1117/12.2526799","url":null,"abstract":"In the metrology of aspheres and freeforms, missing reference surfaces are a big challenge. The evaluation of the performance of measurement systems is currently done by round robin tests. Since the true form of the used specimens are unknown, the question still remains: who is right? This problem is also faced during the assessment of the performance of the Tilted Wave Interferometer. For both the calibration and measurement complex algorithms are applied. They calculate the system model parameters or the surface error from phaseshifting data. The analytical evaluation of different configurations or the influence of certain errors is impossible. The GUM (Guide to the Expression of Uncertainty in Measurement) proposes Monte Carlo simulations as an option for uncertainty evaluations. They are applicable for complex relationships between a measurand and the system’s input quantities. By repeatedly setting the input quantities to random values within a given range and evaluating the system response, statistically relevant data can be generated. In this contribution we present a Monte Carlo based simulation environment for the performance assessment of non-null interferometric measurements. By using the presented simulation tool, virtual experiments can be executed, including the calibration of the setup. They provide simulated measurement data - in the case of the Tilted Wave Interferometer simulated phase data – taking a number of possible errors, like interferometer errors, stage errors and errors of the reference spheres, into account. On this basis, complete calibration procedures and measurements on given samples can be simulated. Its result can be compared with the simulated truth, since all parameters and errors are known, and a statement about the performance can be made. This tool also proves useful for investigations on effects of measurement parameters such as misalignments of the sample.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"195 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133111381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Measurement of freeforms and complex geometries by use of tactile profilometry and multi-wavelength interferometry 使用触觉轮廓测量法和多波长干涉测量法测量自由形状和复杂几何形状

Precision Optics Manufacturing Pub Date : 2019-06-28 DOI: 10.1117/12.2526734

M. Wendel

引用次数: 2

A new approach to surface shape and centration measurement on aspheres with the new V-SPOT technology 利用新型V-SPOT技术测量球面表面形状和浓度的新方法

Precision Optics Manufacturing Pub Date : 2019-06-28 DOI: 10.1117/12.2527650

E. Hofbauer, R. Kometer

引用次数: 2

MSF-error prevention strategies for the grinding process 磨削过程的msf误差预防策略

Precision Optics Manufacturing Pub Date : 2019-06-28 DOI: 10.1117/12.2526581

M. Pohl, U. Bielke, R. Boerret, R. Rascher, Olga Kukso

引用次数: 3

Processing of a new nonlinear optical crystal for continuous wave UV-laser applications 一种用于连续波紫外激光器的新型非线性光学晶体的加工

Precision Optics Manufacturing Pub Date : 2019-06-28 DOI: 10.1117/12.2528140

Jessica Stelzl, C. Wünsche, S. Höfer

{"title":"Processing of a new nonlinear optical crystal for continuous wave UV-laser applications","authors":"Jessica Stelzl, C. Wünsche, S. Höfer","doi":"10.1117/12.2528140","DOIUrl":"https://doi.org/10.1117/12.2528140","url":null,"abstract":"Lasers have been known for a long time and are used in a wide variety of fields such as industrial and material processing or measuring and control technology. A new application is being tested which aims to use continuous wave UV-lasers in metrology. For this application a nonlinear optical crystal is needed. Its processing is developed in a two-year project at the Institute for Precision Manufacturing and High-Frequency Technology of Deggendorf Institute of Technology. The crucial factor for the full optical performance in the UV range is the low roughness of the crystal surface, as it is installed between two prisms and the contactability between them should be ensured. In China, a nonlinear crystal that meets the requirements has already been designed and a production process for the raw crystal has been established. However, since the production of optically homogenous crystals has proven to be difficult, the availability of such is very limited. For this reason, a reference material with similar hardness and material behaviour is used in the process development in order not to be limited in the number of trials. It is important to be able to transfer the results from the reference material in an analogous way to the original crystal. One challenge of the project lies in the crystal thickness, since only a maximum thickness of three millimetres can be achieved for the purest form of the crystal required in the application. Therefore, it is important to handle the material sparingly during the process. In addition, the small dimensions of about ten to five millimetres and the brittleness of the material pose a problem. The goal of the project will be to develop a process that can circumvent all these problems so that small roughness of the crystal can be achieved by precision polishing.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130620924","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Filled-Up-Microscopy (FUM): a non-destructive method for approximating the depth of sub-surface damage on ground surfaces 填充显微镜(FUM):一种近似地表亚表面损伤深度的非破坏性方法

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318576

C. Trum, C. Vogt, Sebastian Sitzberger, O. Faehnle, R. Rascher

{"title":"Filled-Up-Microscopy (FUM): a non-destructive method for approximating the depth of sub-surface damage on ground surfaces","authors":"C. Trum, C. Vogt, Sebastian Sitzberger, O. Faehnle, R. Rascher","doi":"10.1117/12.2318576","DOIUrl":"https://doi.org/10.1117/12.2318576","url":null,"abstract":"Subsurface Damages (SSDs) can cause a wide variety of defects to optical lenses and other components. In addition to the adhesion and quality of coatings, the mechanical stability, the transmission quality and the laser-induced damage threshold (LIDT) of the products, is also affected. It is, therefore, attempted to get components as SSD-free as possible at the end of the production chain. Already during the individual production steps, it is important to know the depth of the SSDs in order to remove them in the following manufacturing steps. To design the manufacturing processes efficiently and avoid damage, it is important to be able to measure the depth and characteristics of SSDs as precisely as possible. There are a several approaches and methods to determine SSDs known in literature. However, many of them inevitably lead to the destruction of the workpiece. Although others are non-destructive, but very complex in design and/or associated with large investments. Likewise, only a few are suitable for determining SSDs on ground rough surfaces. Filled-Up Miicroscopy (FUM) is an alternative approach to approximating the depth of SSDs, even on rough surfaces without destroying them. At a first glance at the method, the procedure is described in detail and all necessary steps of preparing the samples are shown. A first comparison with the known Ball Dimpling Method confirms the functionality of the concept.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114288816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mid-spatial frequency errors of mass-produced aspheres 量产球面的中频误差

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318663

Wilhelmus Messelink, Amy Frantz, S. Ament, Matthew Stairiker

引用次数: 1

Fast and reliable in-situ measurements of large and complex surfaces using a novel deflectometric device 快速和可靠的原位测量大型和复杂的表面使用新的偏转测量装置

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318583

R. Kometer, E. Hofbauer

{"title":"Fast and reliable in-situ measurements of large and complex surfaces using a novel deflectometric device","authors":"R. Kometer, E. Hofbauer","doi":"10.1117/12.2318583","DOIUrl":"https://doi.org/10.1117/12.2318583","url":null,"abstract":"In-situ measurements of complex surfaces during the polishing process is a challenge for the production of aspheric surfaces or freeforms. We are providing a new attempt by using a scanning deflectometric device based on our recently published DaOS [1] principle, which allows in-situ measurements of large optical surfaces in realistic production environments and offers the conditions for direct intervention and correction in the polishing process. The results of insitu surface measurements after three polishing steps of a large glass substrate (320 mm in diameter) in a lever-polishing machine (NLP500 from Stock Konstruktion GmbH) are shown and critically compared with interferometric measurements on a SSI-A Interferometer. In this paper, the technical setup consisting of a highly precise scanning penta prism device and a Vignetting Field Stop (VFS) Sensor is explained. Secondly, we are discussing the mathematical algorithm to reconstruct the complete surface from angle measurements from a given number of cross-sectional cuts. The data of the surface reconstruction are transformed into a XYZ-file format to be analyzed with MetroPro®. The results are shown and discussed in terms of accuracy and reproducibility. Finally, a comparison with interferometric measurements on an SSI-A (QED) at TH Deggendorf (THD), Technology Campus Teisnach is shown to proof the degree of accuracy and applicability of our new, fast and reliable device for in-situ measurements of complex surfaces.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116254671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

SPDT and standard CNC-grinding of tungsten carbide molds for precision glass molding: an experimental process analysis 精密玻璃成型用碳化钨模具的SPDT和标准cnc磨削:实验过程分析

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318710

C. Vogt, O. Faehnle, M. Doetz

引用次数: 3