Precision Optics Manufacturing最新文献

Acoustic emissions in the glass polishing process: a possible approach for process monitoring 玻璃抛光过程中的声发射:一种可能的过程监控方法

Precision Optics Manufacturing Pub Date : 2023-09-05 DOI: 10.1117/12.2676245

Michael F. Benisch, Hemlin Shaji, Werner Bogner, Oliver Faehnle

{"title":"Acoustic emissions in the glass polishing process: a possible approach for process monitoring","authors":"Michael F. Benisch, Hemlin Shaji, Werner Bogner, Oliver Faehnle","doi":"10.1117/12.2676245","DOIUrl":"https://doi.org/10.1117/12.2676245","url":null,"abstract":"Acoustic emissions (AEs) are elastic stress waves in solids. They occur when irreversible changes take place in the internal structure (e. g. the formation of cracks) of a solid (material). The benefits of the measurement of AEs are well known, and their application has already been described for various use cases. They are, for example, used for monitoring bridges to detect rope cracks. We want to investigate the possibilities of using AEs in the polishing process of glass, a complicated manufacturing process with several overlapping, chemical and mechanical influences. We will present the results of preliminary studies which shall answer the following questions: • Is it possible to measure acoustic emission signals, even if an unhindered access to the place of origin under manufacturing situations can not be guaranteed? • How is the development of the signal during the polishing process? • How can acoustic emissions be used in the future to improve optics manufacturing? • Is the opportunity of an endpoint detection existing? Answering these questions will demonstrate the abilities AEs can offer for evaluating and monitoring manufacturing processes. In the future it should be possible to create a cyber-physical system (CPS). In such a system, AE signals can be merged with other sensor signals (e. g. power of the machine, pH value, · · ·).","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116219884","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

Conceptual considerations for the paperless production of ophthalmic lenses 眼科镜片无纸化生产的概念考虑

Precision Optics Manufacturing Pub Date : 2023-09-05 DOI: 10.1117/12.2678303

Andreas Kaufmann

引用次数: 0

Superposition of cryogenic and ultrasonic assisted machining of Zerodur 低温与超声辅助零度加工的叠加

Precision Optics Manufacturing Pub Date : 2023-09-05 DOI: 10.1117/12.2678074

Christian Vogt, Helge Thiess, Jacqueline Blasl, Nico Hanenkamp, Klaus Lichtinger

引用次数: 0

Simulation of system transmission values for different angles of incidence 不同入射角下系统传输值的仿真

Precision Optics Manufacturing Pub Date : 2023-09-05 DOI: 10.1117/12.2676121

Michael Wagner

引用次数: 0

Ultrasonic-assisted drilling of preforms for fibre optics 光纤预制体的超声辅助钻孔

Precision Optics Manufacturing Pub Date : 2023-09-05 DOI: 10.1117/12.2676016

Christian Pflanz, Jens Ketelaer

引用次数: 0

Fast, semi-automated geometric and functional characterization of miniaturized lenses using optical coherence tomography-based systems and wavefront sensors 使用光学相干层析成像系统和波前传感器对小型化透镜进行快速、半自动的几何和功能表征

Precision Optics Manufacturing Pub Date : 2023-09-05 DOI: 10.1117/12.2675885

Alfredo Velazquez Iturbide, Robert Schmitt

{"title":"Fast, semi-automated geometric and functional characterization of miniaturized lenses using optical coherence tomography-based systems and wavefront sensors","authors":"Alfredo Velazquez Iturbide, Robert Schmitt","doi":"10.1117/12.2675885","DOIUrl":"https://doi.org/10.1117/12.2675885","url":null,"abstract":"Miniaturized lenses are increasingly utilized in a range of applications, including medical devices, optical communication, and imaging systems. The characterization of these lenses is crucial as their performance is highly dependent on their geometrical and functional properties. However, the small size of these lenses coupled with the required short measurement times, presents a significant challenge for conventional measurement techniques. Recent advances in optical coherence tomography (OCT) and Shack Hartmann wavefront sensors (SHWS) have enabled rapid, semi-automated geometric and functional characterization of miniaturized lenses when appropriate hardware, software, and algorithms are integrated. OCT is a non-invasive imaging technique that can provide high-resolution cross-sectional images of the lens, allowing the accurate measurement of its central thickness, curvature, and other geometric parameters of both surfaces. Moreover, SHWS can be used to measure the transmitted wavefront error of the lens, which is directly related to its optical performance. In this paper, we demonstrate the use of OCT and SHWS to characterize polymer and glass lenses with diameters and thicknesses of a few millimeters with spherical and aspherical shapes. Our results show that OCT is capable of accurately measuring the central thickness and surface profile of the lenses, while SHWS provides information on their wavefront aberrations. By combining these two techniques, we were able to obtain a com-prehensive characterization of the lenses' geometrical and functional properties.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"4 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114126073","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

Plasma jet polishing of optical surfaces 光学表面的等离子射流抛光

Precision Optics Manufacturing Pub Date : 2023-09-05 DOI: 10.1117/12.2675793

Heike Müller, Thomas Arnold

引用次数: 0

Analysis of flexibility in precision glass molding (PGM) 精密玻璃模压柔性分析

Precision Optics Manufacturing Pub Date : 2023-09-05 DOI: 10.1117/12.2675998

Carlos Marin Tovar, M. Friedrichs, T. Grunwald, Thomas Bergs

{"title":"Analysis of flexibility in precision glass molding (PGM)","authors":"Carlos Marin Tovar, M. Friedrichs, T. Grunwald, Thomas Bergs","doi":"10.1117/12.2675998","DOIUrl":"https://doi.org/10.1117/12.2675998","url":null,"abstract":"The demand for precision glass optics with complex shapes has increased in recent years, primarily in sectors such as lighting technology, automotive, laser technology, and consumer electronics. This rising trend, combined with production costs, represents a major challenge for the industry as demand needs to be met in a cost-effective manner. To address this challenge, the industry had developed innovative solutions to remain competitive. Precision glass molding (PGM) has emerged as a promising solution for this purpose. PGM is a replicative manufacturing process that enables a cost-effective production of precise glass optics. In this process, a glass preform is heated up into a viscoelastic state and pressed between a pair of molding tools. However, the manufacturing process of the molding tools can be both time-consuming and expensive. Additionally, they are specifically manufactured to produce a certain lens design under a given set of molding parameters. During this investigation, we considered a molding tool pair used to produce a specific lens design. We varied the process parameters, such as pressing force and temperature, into several different combinations, and produced the lenses subsequently. The aim is to analyze the flexibility in the PGM process, and to determine whether different lens geometries can be produced with a pair of molding tools. The final shape of the molded lenses was measured using a profilometer, while the center thickness of the lenses was measured with an absolute digital measuring probe. Finally, the shapes obtained from the molded lenses were compared and analyzed. The pressing temperature and force have a considerable impact in the final shape, which can be tuned along with other process parameters to achieve a certain degree of flexibility in the molding process.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122903372","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

Experimental investigations on the manufacturing of fused silica freeform surfaces by means of fine and ultra-fine grinding 精磨和超精磨加工熔融硅自由曲面的实验研究

Precision Optics Manufacturing Pub Date : 2023-09-05 DOI: 10.1117/12.2677292

Sebastian Henkel, Christian Schulze, Samson Frank, J. Bliedtner, E. Rädlein

{"title":"Experimental investigations on the manufacturing of fused silica freeform surfaces by means of fine and ultra-fine grinding","authors":"Sebastian Henkel, Christian Schulze, Samson Frank, J. Bliedtner, E. Rädlein","doi":"10.1117/12.2677292","DOIUrl":"https://doi.org/10.1117/12.2677292","url":null,"abstract":"The manufacturing of optical freeform surfaces offers a high potential for optical approaches in the future, since they can make new optical systems lighter and more compact or even enable completely new functions, compared to conventional optics. However, the expanded possibilities go hand in hand with higher complexity in production of freeforms for precision optical applications. This leads to high prices and long delivery times. This paper shows an approach to improve manufacturing of freeforms in small batch sizes with a high degree of customization, by a process chain consisting of (ultrasonic-assisted) pre- and fine grinding combined with ultra-fine grinding using resin bond tools. The process chain is suited for efficient fabrication of optical surfaces. A main focus of the experiments is on reduction of low- and mid-spatial frequency surface deviations, as well as surface roughness. Several different influencing factors in a 5-axis CNC grinding process of fused silica freeforms are investigated and their effects on the resulting surface topography (from the low to the high frequency range of surface deviations) are observed using white light interferometry measurement principles. Various optimization approaches can be concluded.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"17 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133169944","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

Fully automated centering and bonding of lenses for high-quality objectives 全自动定心和粘接高品质物镜镜头

Precision Optics Manufacturing Pub Date : 2022-07-15 DOI: 10.1117/12.2631763

Lisa Kempa, P. Langehanenberg, C. Wilde

{"title":"Fully automated centering and bonding of lenses for high-quality objectives","authors":"Lisa Kempa, P. Langehanenberg, C. Wilde","doi":"10.1117/12.2631763","DOIUrl":"https://doi.org/10.1117/12.2631763","url":null,"abstract":"Modern high-performance optical systems require new technologies for alignment and joining processes. With the established OptiCentric® Bonding 5D TRIOPTICS offers a technology that provides high-precision lens mounting based on adhesive bonding. With innovative alignment bonding in 5 dimensions, the lens surfaces are aligned to the tube with accuracies below 1 μm in x, y, z direction and below 2 arcsec in Θx and Θy direction. This fine-adjustment method doesn’t dependent on mechanical tolerances because the lens can move freely in the frame. By using high-resolution autocollimators as well as tactile and optical distance sensors the accuracy of each lens is checked after each step of machining. This procedure facilitates the stacking of several lenses into one tube without further costly alignment steps of sub-cells. This reduces the process steps and makes the multilens mounting into a tube more efficient. Furthermore, glue bonded lenses without sub-cells save space and weight due to waiver of set-screws and shims. Integrated into the production line this technology allows a greater degree of accuracy of optical systems and new design opportunities for more compact and higher-quality lenses. The highly flexible OptiCentric® Bonding 5D can be quickly converted to other types of lenses. This technology is also suitable for clean room applications.","PeriodicalId":422212,"journal":{"name":"Precision Optics Manufacturing","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128109558","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