scholarly journals Null-screen design for highly freeform surface testing

2020 ◽  
Vol 28 (24) ◽  
pp. 36706
Author(s):  
Daniel Aguirre-Aguirre ◽  
Brenda Villalobos-Mendoza ◽  
Rufino Díaz-Uribe ◽  
Manuel Campos-García
Keyword(s):  
Freeform Surface ◽  
Screen Design ◽  
Surface Testing

Null-Screen design for freeform surface testing

2019 ◽  
Author(s):  
Daniel Aguirre-Aguirre ◽  
Brenda Villalobos-Mendoza ◽  
Rufino Díaz-Uribe ◽  
Manuel Campos-García
Keyword(s):  
Freeform Surface ◽  
Screen Design ◽  
Surface Testing

Null Compensator Testing Convex Freeform Surface Mirror with CGH Technology

2013 ◽  
Vol 660 ◽  
pp. 163-166 ◽  
Author(s):  
Zhong Yu Zhang ◽  
Bin Zhi Zhang
Keyword(s):  
Freeform Surface ◽  
Free Form ◽  
Optical Testing ◽  
Main Method ◽  
Precise Position ◽  
Computer Generated Hologram ◽  
Free Form Surface ◽  
Surface Testing

The Computer Generated Hologram（CGH）technique is the main method for optical testing the free form surface .For testing a convex free form surface mirror, a CGH element with the surface testing, interferometer and free form mirror precise position function was designed by use of appropriative software, the testing precision was less than 0.011λ（λ=632.8nm）in RMS value by this means.

A flexible angle compensation method for freeform surface testing based on tip/tilt mirror

2019 ◽  
Vol 444 ◽  
pp. 21-27 ◽  
Author(s):  
Jinming Gao ◽  
Hua Shen ◽  
Jia Li ◽  
Yue Sun ◽  
Xiangqun Cui ◽  
...  
Keyword(s):  
Compensation Method ◽  
Freeform Surface ◽  
Surface Testing

Sand Free Production Success Through Proven Technology Enabler from An Untapped Heterogeneous Reservoir Zone Utilizing Gravel Pack Replacement Methodology

2020 ◽  
Author(s):  
Y. Anggoro
Keyword(s):  
Oil And Gas ◽  
Erosion Resistance ◽  
Cost Effective ◽  
High Rate ◽  
Screen Design ◽  
Sand Control ◽  
Rules Of Thumb ◽  
Production Success ◽  
Control Technologies ◽  
Gravel Pack

The Belida field is an offshore field located in Block B of Indonesia’s South Natuna Sea. This field was discovered in 1989. Both oil and gas bearing reservoirs are present in the Belida field in the Miocene Arang, Udang and Intra Barat Formations. Within the middle Arang Formation, there are three gas pay zones informally referred to as Beta, Gamma and Delta. These sand zones are thin pay zones which need to be carefully planned and economically exploited. Due to the nature of the reservoir, sand production is a challenge and requires downhole sand control. A key challenge for sand control equipment in this application is erosion resistance without inhibiting productivity as high gas rates and associated high flow velocity is expected from the zones, which is known to have caused sand control failure. To help achieve a cost-effective and easily planned deployment solution to produce hydrocarbons, a rigless deployment is the preferred method to deploy downhole sand control. PSD analysis from the reservoir zone suggested from ‘Industry Rules of Thumb’ a conventional gravel pack deployment as a means of downhole sand control. However, based on review of newer globally proven sand control technologies since adoption of these ‘Industry Rules of Thumb’, a cost-effective solution could be considered and implemented utilizing Ceramic Sand Screen technology. This paper will discuss the successful application at Block B, Natuna Sea using Ceramic Sand Screens as a rigless intervention solution addressing the erosion / hot spotting challenges in these high rate production zones. The erosion resistance of the Ceramic Sand Screen design allows a deployment methodology directly adjacent to the perforated interval to resist against premature loss of sand control. The robust ceramic screen design gave the flexibility required to develop a cost-effective lower completion deployment methodology both from a challenging make up in the well due to a restrictive lubricator length to the tractor conveyancing in the well to land out at the desired set depth covering the producing zone. The paper will overview the success of multi-service and product supply co-operation adopting technology enablers to challenge ‘Industry Rules of Thumb’ replaced by rigless reasoning as a standard well intervention downhole sand control solution where Medco E&P Natuna Ltd. (Medco E&P) faces sand control challenges in their high deviation, sidetracked well stock. The paper draws final attention to the hydrocarbon performance gain resulting due to the ability for choke free production to allow drawing down the well at higher rates than initially expected from this zone.

Full Surface Testing of Grazing Incidence Mirrors

1992 ◽  
Author(s):  
John L. Remo
Keyword(s):  
Grazing Incidence ◽  
Surface Testing

Soft Twisting Pneumatic Actuators Enabled by Freeform Surface Design

2021 ◽  
pp. 1-1
Author(s):  
Feifei Chen ◽  
Yunpeng Miao ◽  
Guoying Gu ◽  
Xiangyang Zhu
Keyword(s):  
Freeform Surface ◽  
Surface Design ◽  
Pneumatic Actuators

scholarly journals Asymmetric Double Freeform Surface Lens for Integrated LED Automobile Headlamp

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 663
Author(s):  
Hui Zhang ◽  
Dengfei Liu ◽  
Yinwan Wei ◽  
Hong Wang
Keyword(s):  
Optical System ◽  
Design Method ◽  
Chromatic Dispersion ◽  
Electronic Devices ◽  
Color Temperature ◽  
Freeform Surface ◽  
United Nations Economic Commission ◽  
System A ◽  
Economic Commission ◽  
Key Points

We propose a design method of asymmetric double freeform surface lens for an integrated LED automobile headlamp and develop an integrated LED automobile optical system. A single asymmetric double freeform surface lens is designed to redistribute rays emitting from the light source for realizing both low and high beams. Moreover, a freeform surface reflector is used to improve the energy efficiency of high beams. The prism placed in the optical path can suppress chromatic dispersion on the edge of the target plane. Simulation and experimental results show that the illumination values and color temperature of the key points can fully meet the requirements of United Nations Economic Commission for Europe vehicle regulations (ECE) R112, 48, and 128. The volume of the whole optical system comprised of freeform surface elements is smaller than that of the low beam system of a traditional headlamp, resulting in saved space, in which other electronic devices can be installed for the safety of the driver, which indicates that the proposed method is practical in the field of automobile lighting.

Virtual-stereo fringe reflection technique for specular free-form surface testing

2016 ◽  
Author(s):  
Suodong Ma ◽  
Bo Li
Keyword(s):  
Free Form ◽  
Free Form Surface ◽  
Surface Testing

Screen Design

1882 ◽  
Vol 1 (1) ◽  
pp. 20
Author(s):  
E. L. Swan
Keyword(s):  
Screen Design
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