Evaluation of an optical surface using nanometrology in optical manufacturing technology

2000 ◽  
Author(s):  
Jianbai Li ◽  
Anqing Zhao ◽  
Xiaoyun Li ◽  
Xiaoli Zhang ◽  
Ming Wang
Keyword(s):  
Manufacturing Technology ◽  
Optical Surface ◽  
Optical Manufacturing

Discussion on Laser Cleaning of Optical Surface Machined by Magnetorheological Finishing

2010 ◽  
Vol 135 ◽  
pp. 409-412 ◽  
Author(s):  
Gui Wen Kang
Keyword(s):  
Laser Cleaning ◽  
Numerical Control ◽  
Flowing Water ◽  
Optical Surface ◽  
Working Ability ◽  
Magnetorheological Finishing ◽  
High Quality ◽  
Finishing Process ◽  
Optical Manufacturing ◽  
Surface Figure

Magnetorheological finishing (MRF) is a novel precision optical machining technology. Owing to its flexible finishing process, MRF can eliminate subsurface damage, smooth rms micro roughness and correct surface figure errors. Through proper designing of numerical control, sphere and asphere optics can be machined by magnetorheological finishing with high quality. Owing to it’s excellence in optical manufacturing, MRF has gained more and more application in industry. Under most conditions the optical surface after MRF would have certain contaminant particles and this would affect its working ability in future use. Formerly the polished workpiece is cleaned by flowing water or ultrasonic cleaning and the contaminat particles couldn’t be totally removed. Laser cleaning is brought forward in this paper and good results could be anticipated.

Progress of advanced optical manufacturing technology integrated line

2006 ◽  
Author(s):  
Qiao Xu ◽  
Wei Li ◽  
Jian Wang ◽  
Liqun Cai
Keyword(s):  
Manufacturing Technology ◽  
Optical Manufacturing

scholarly journals Research and Experimental Verification on Topology-Optimization Design Method of Space Mirror Based on Additive-Manufacturing Technology

Machines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 354
Author(s):  
Yanchao Fan ◽  
Deyi Dong ◽  
Chao Li ◽  
Yuxin Sun ◽  
Zhiyu Zhang ◽  
...  
Keyword(s):  
Topology Optimization ◽  
Additive Manufacturing ◽  
Design Method ◽  
Diamond Turning ◽  
Manufacturing Technology ◽  
Surface Shape ◽  
Mirror Surface ◽  
Optical Surface ◽  
Shape Accuracy ◽  
Additive Manufacturing Technology

As one of the most-critical components in space optical cameras, the performance of space mirrors directly affects the imaging quality of space optical cameras, and the lightweight form of mirror blanks is a key factor affecting the structural quality and the surface-shape accuracy of mirrors. For the design requirements of lightweight and high surface-shape accuracy with space mirrors, this study proposes a design and manufacturing method that integrates topology-optimization with additive-manufacturing technology. This article firstly introduced the basic process and key technologies of space-mirror design and analyzed the superiority of combining a topology-optimized configuration design and additive-manufacturing technology; secondly, the topology-optimized design method of a back-open-structure mirror was used to complete the scheme design of a Φ260 mm aperture mirror; finally, the laser selective-melting manufacturing technology was used to complete the Φ260 mm aperture mirror blank. The mirror and its support structure were assembled and tested in a modal mode; the resonant frequencies of the mirror assembly were all over 600 Hz; and the deviation from the analytical results was within 2%. The optical surface of the mirror was turned by the single-point diamond-turning (SPDT) technique. The accuracy of the optical surface was checked by a Zygo interferometer. The RMS accuracy of the mirror surface was 0.041λ (λ is the wavelength; λ = 632 nm). In the test of the influence of gravity on the surface-shape accuracy, the mirror was turned over, which was equivalent to twice the gravity, and the RMS of the mirror surface-shape accuracy was 0.043λ, which met the requirement. The verification results show that the mirror designed and fabricated by the additive-manufacturing-based mirror-topology-optimization method can be prepared by the existing process, and the machinability and mechanical properties can meet the requirements, which provides an effective development method for improving the structural design and optimizing the manufacturing of space reflectors.

Progress of advanced optical manufacturing technology

2013 ◽  
Vol 25 (12) ◽  
pp. 3098-3105 ◽  
Author(s):  
许乔 Xu Qiao ◽  
王健 Wang Jian ◽  
马平 Ma Ping ◽  
陈贤华 Chen Xianhua ◽  
雷向阳 Lei Xiangyang
Keyword(s):  
Manufacturing Technology ◽  
Optical Manufacturing

Variation of the amount of hydrogen along the galactic ridge

1967 ◽  
Vol 31 ◽  
pp. 171-172
Author(s):  
Th. Schmidt-Kaler
Keyword(s):  
Surface Brightness ◽  
Milky Way ◽  
Neutral Hydrogen ◽  
Line Of Sight ◽  
Optical Surface ◽  
Hydrogen Density ◽  
Continuous Radiation ◽  
Galactic Longitude

The integralNHof neutral-hydrogen density along the line of sight is determined from the Kootwijk and Sydney surveys. The run ofNHwith galactic longitude agrees well with that of thermal continuous radiation and that of the optical surface brightness of the Milky Way.

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