Precision Optics Manufacturing最新文献_第9页

gPVA: a system for the classification of grinding tools gPVA:研磨工具分类系统

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318695

C. Vogt, O. Faehnle, R. Rascher

引用次数: 0

Characterizing the resolving power of laser Fizeau interferometers 激光菲索干涉仪分辨能力的表征

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2317630

Torsten Glaschke, L. Deck, P. D. de Groot

引用次数: 5

Simulation of MSF errors using Fourier transform 用傅里叶变换模拟MSF误差

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2317484

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

引用次数: 7

Workpiece self-weight in precision optics manufacturing: compensation of workpiece deformations by a fluid bearing 精密光学制造中的工件自重:用流体轴承补偿工件变形

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318577

Sebastian Sitzberger, C. Trum, R. Rascher, M. Zaeh

{"title":"Workpiece self-weight in precision optics manufacturing: compensation of workpiece deformations by a fluid bearing","authors":"Sebastian Sitzberger, C. Trum, R. Rascher, M. Zaeh","doi":"10.1117/12.2318577","DOIUrl":"https://doi.org/10.1117/12.2318577","url":null,"abstract":"The effects, the extent and the importance of workpiece deformations, particularly lenses, caused by the weight of the workpiece itself, were examined in a previous paper1 . The considered deformations are in the single-digit to two-digit nanometer range. The investigation was carried out by FEM calculations. The conclusion of the previous aper was that a full-surface support of a workpiece in the processing of one surface presumably produces the best results. Furthermore, it was found that if the second functional surface is not to be touched in the process, a full contact lens mounting on its circumference is advisable. An alternative method for fixing precision lenses is therefore desirable. This can be accomplished in two steps. As a first step, the lens must be gripped at its periphery so that none of the optically functional surfaces of the lens is compromised. However, the complete circumference has to be fixated gaplessly because a punctual fixation has the disadvantage of deforming the lens surface asymmetrically. As a second step, the freely hanging lens surface should be supported to minimize deformation. An approach had to be found that supports the surface like a solid bearing but at the same time does not touch it. Therefore, the usage of an incompressible fluid as a hydrostatic bearing for full-surface support is pursued. For this purpose, the bottom side of the lens has to be stored on water. The results of the FEM simulation showed that with a fluid bearing the resulting deformations can be drastically reduced in comparison to a freely hanging surface. Furthermore, under the right conditions, a resulting deformation comparable to a full surface solid support can be achieved. The content of this paper is a test series under laboratory conditions for a first validation of the theoretical results. Therefore, a prototype model to test a lens fixation with a fluid bearing was developed and manufactured. The resulting deformations were measured with an interferometer and the effects are discussed.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"88 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":"125636301","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: 0

Tight tolerances for large-volume precision-pressed plastic optics (COMPAS) 大体积精密压制塑料光学元件(COMPAS)的严格公差

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318670

Marc Wielandts, Remi Wielandts, R. Leutz

引用次数: 0

Basics of ion beam figuring and challenges for real optics treatment 离子束计算的基础和实际光学处理的挑战

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318572

D. Schaefer

引用次数: 7

Increasing critcal depth of cut in ductile mode machining of tungsten carbide by process parameter controlling 通过工艺参数控制提高碳化钨韧性模加工的临界切削深度

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318709

M. Doetz, O. Dambon, F. Klocke, J. Lee, O. Fähnle, E. Langenbach

{"title":"Increasing critcal depth of cut in ductile mode machining of tungsten carbide by process parameter controlling","authors":"M. Doetz, O. Dambon, F. Klocke, J. Lee, O. Fähnle, E. Langenbach","doi":"10.1117/12.2318709","DOIUrl":"https://doi.org/10.1117/12.2318709","url":null,"abstract":"Ductile mode machining is usually applied for the optical finishing operation of e.g. tungsten carbide molds. One request for this mode is not to exceed the critical depth of cut hcu,crit characterized by the transition point from ductile to brittle material removal. Based on experimental investigations a formula for the critical depth of cut, relating the material specific properties Young’s-Modulus E, material hardness H and fracture toughness KC was developed by Bifano et. all [1]. Even when the influence of cutting conditions, like tool or process characteristics, are neglected the formula is widely used for setting up UPM machines ever since. However, previous investigations have shown that hcu,crit strongly depends on coolant fluid characteristic as well as on the compressive stress applied into the cutting zone by the use of tools with e.g. negative rank angles [2]. In this paper, we report on a ductile process analysis applying a recently developed method for process optimization in optics fabrication [3]. Following that trail, critical process parameters have been identified and their influences on the critical depth of cut hcu,crit have been tested experimentally in fundamental ruling tests. Among others, following parameters were identified and tested: (a) characteristics of the coolant used, (b) the pH value of the coolant, (c) the tool specifications of the applied diamond and (d) whether ultrasonic assistance (US) is being switched on or off. Depending on the applied set of process parameters and for the experimental data collected, maximum ductile mode material removal rates could be achieved with dcmax = 1600 nm. That way, a new formula was developed, which allows the prediction of the critical depth of cut depending on critical process parameters while machining binderless nanocrystalline tungsten carbide. The formula was set up based on experimental results and is one step towards extending Bifanos formula taking the influences of critical process parameters into account.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"56 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":"121418283","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

Contribution of the phase transfer function of extended measurement cavities to mid spatial frequencies and the overall error budget 扩展测量腔的相传递函数对中频的贡献和总体误差预算

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318711

G. Fütterer, J. Liebl, A. Haberl

{"title":"Contribution of the phase transfer function of extended measurement cavities to mid spatial frequencies and the overall error budget","authors":"G. Fütterer, J. Liebl, A. Haberl","doi":"10.1117/12.2318711","DOIUrl":"https://doi.org/10.1117/12.2318711","url":null,"abstract":"A challenge of coaxial - measurement cavity based - interferometer is to realize an interference contrast in the vicinity of one and to realize a complete elimination of the parasitic reflections. Another challenge, which also exists in non-coaxial setups, is the phase transfer function of extended measurement cavities. Ideally, the surface under test (SUT) and the reference surface (REF) are both exactly imaged onto the detector plane. In practice, SUT and REF have to be placed within the depth of field (DOF), which refers to the object space. The term depth of focus refers to the image space. To avoid confusion, the depth of field might be referred to as DOOF (depth of object field) and the depth of focus might be referred to as DOIF (depth of image field). However, in many measurement situations, the REF is not placed within the DOOF, which is the small z-range, which is imaged onto the detector plane. Furthermore, the phase transfer function (PTF) of the REF and the image distortion of the REF are both dependent on the focal plane used to image the SUT onto the detector plane. Effects as phase deformation, image distortion and image blurring have to be taken into account when using extended measurement cavities. This can be done by using a look up table (LUT), which contains simulated and/or calibrated data. Thus, the related system error can be subtracted. A remaining challenge is an unknown object under test (OUT), which is measured by using a double path arrangement. The measured wave front depends on the two surfaces of the OUT and the position of the return mirror. For simplicity, a homogeneous substrate and a perfect return mirror might be presumed. The simulation of waves propagating within extended measurement cavities, as well as measurement results, will be discussed. In addition, the influence on the power spectral density (PSD) will be described. This is important for high end correction techniques as e.g. magneto rheological figuring (MRF) and ion beam figuring (IBF).","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"29 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":"114293904","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: 0

First steps in ELT optics polishing ELT光学抛光的第一步

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2317604

R. Geyl, D. Bardon, R. Bourgois, N. Ferachoglou, E. Harel, C. Couteret

引用次数: 10

DefGO DefGO

Precision Optics Manufacturing Pub Date : 2018-08-07 DOI: 10.1117/12.2318704

J. Liebl, C. Schopf, R. Rascher

引用次数: 0