Measuring rough optical surfaces using scanning long-wave optical test system 1 Principle and implementation

2013 ◽  
Vol 52 (29) ◽  
pp. 7117 ◽  
Author(s):  
Tianquan Su ◽  
Shanshan Wang ◽  
Robert E. Parks ◽  
Peng Su ◽  
James H. Burge
Keyword(s):  
Test System ◽  
Optical Surfaces ◽  
Long Wave ◽  
Optical Test ◽  
System 1

scholarly journals Improvements in the scanning long-wave optical test system

2018 ◽  
Author(s):  
Andrew E. Lowman ◽  
Hyemin Yoo ◽  
Greg A. Smith ◽  
Chang Jin Oh ◽  
Matthew Dubin
Keyword(s):  
Test System ◽  
Long Wave ◽  
Optical Test

Scanning Long-wave Optical Test System: a new ground optical surface slope test system

2011 ◽  
Author(s):  
Tianquan Su ◽  
Won Hyun Park ◽  
Robert E. Parks ◽  
Peng Su ◽  
James H. Burge
Keyword(s):  
Test System ◽  
Optical Surface ◽  
Surface Slope ◽  
System A ◽  
Long Wave ◽  
Slope Test ◽  
Optical Test

Precise positioning of the test surface and screen in a coaxial software configurable optical test system

2020 ◽  
Vol 31 (4) ◽  
pp. 045010
Author(s):  
Mei Hui ◽  
Xinji Li ◽  
Ning Li ◽  
Ming Liu ◽  
Liquan Dong ◽  
...  
Keyword(s):  
Test System ◽  
Test Surface ◽  
Precise Positioning ◽  
Optical Test

Experimental Demonstration of Precision Control of a Deployable Optics Structure

2002 ◽  
Vol 124 (3) ◽  
pp. 441-450 ◽  
Author(s):  
R. Scott Erwin ◽  
Karl Schrader ◽  
Ruth L. Moser ◽  
Steven F. Griffin
Keyword(s):  
Control System ◽  
Structural Control ◽  
Level Control ◽  
Precision Control ◽  
Research Issues ◽  
Optical Surfaces ◽  
Point Tracking ◽  
High Bandwidth ◽  
And Performance ◽  
System 1

This paper presents the development, design, and implementation of a precision control system for a large, sparse-aperture space-deployable telescope testbed. Aspects of the testbed and laboratory environment relevant to nanometer-level control and performance objectives are provided. There are four main objectives of the control system: 1) reduction of natural resonances of the supporting structure, 2) rejection of tonal disturbances, 3) tip, tilt, and piston set-point tracking for optical surfaces, and 4) reduction in settling time of optical surfaces after an impulsive slew-type disturbance. The development of a three-input, three-output, high-bandwidth structural control system for the testbed is presented, and experimental data demonstrating that all objectives were attained is provided. The paper concludes with a discussion of the results and a description of research issues remaining to be addressed.

scholarly journals Video Scanning Hartmann Optical Testing of State-of-the-Art Parabolic Trough Concentrators

Solar Energy ◽  
2006 ◽  
Author(s):  
Tim Wendelin ◽  
Ken May ◽  
Randy Gee
Keyword(s):  
Technology Development ◽  
Scale Up ◽  
Test System ◽  
Optical Testing ◽  
Parabolic Trough ◽  
Energy Technologies ◽  
Energy Needs ◽  
World Energy ◽  
Optical Test ◽  
And Performance

Significant progress has been made recently in solar parabolic trough technology development and deployment. Part of this success is due to the changing world energy scenario and the recognition that viable renewable energy technologies can play a role in supplying world energy needs. Part is also due to ongoing collaborative efforts by industry and the Department of Energy’s (DOE) Concentrating Solar Power Program (CSP) to enhance the state of the technology in terms of both cost and performance. Currently, there are two trough concentrator projects which the DOE CSP program is supporting. One company, Solargenix, is developing a design to be used in a 64MW plant outside of Boulder City, Nevada. This design is based on the original LUZ LS-2 trough concentrators employed at the Solar Electric Generating Systems (SEGS) plants in Southern California. Another company, Industrial Solar Technology (IST), is working on a scale-up of their design used historically for process heat applications. Very different from the LS-2 approach, this design is still in the research and development stages. One way in which the DOE CSP parabolic trough program assists industry is by providing optical testing and qualification of their concentrator designs. This paper describes the Video Scanning Hartmann Optical Test System (VSHOT) used to optically test both of these designs. The paper also presents the results of tests performed in the past year and what impact the testing has had on the developmental direction of each design.

An Electro-Optical Test System

1962 ◽  
Vol MIL-6 (3) ◽  
pp. 310-315 ◽  
Author(s):  
David M. Goodman
Keyword(s):  
Test System ◽  
Optical Test

Injection molding lens metrology using software configurable optical test system

2016 ◽  
Author(s):  
Cheng Zhan ◽  
Dewen Cheng ◽  
Shanshan Wang ◽  
Yongtian Wang
Keyword(s):  
Injection Molding ◽  
Test System ◽  
Optical Test

scholarly journals Numerical and Experimental Modal Analysis Applied to an Optical Test System Designed for the Form Measurements of Metre-Scale Optics

2018 ◽  
Vol 2018 ◽  
pp. 1-14
Author(s):  
P. G. Golanó ◽  
L. Zanotti Fragonara ◽  
P. Morantz ◽  
R. Jourdain
Keyword(s):  
Modal Analysis ◽  
Dynamic Range ◽  
Design Feature ◽  
Test System ◽  
Element Analysis ◽  
Measurement Capability ◽  
Fea Model ◽  
Natural Modes ◽  
Investigation Methods ◽  
Optical Test

The work focuses on the structural design and performances of a unique optical test system (OTS) used for measuring metre-scale optical surfaces. The investigation was carried out through a modal analysis. Two sets of results are presented. Both modal analysis of the entire OTS and transmissibility function related to its use as an optical system are carried out and analysed. The OTS is used for the measurements of the form accuracy at nanometre level of metre-scale concave surfaces. The OTS is a four and half-metre-tall mechanical structure made of bolted aluminium profiles, two structural platens, two dedicated precision positioning supports, a test piece, and a state-of-the-art laser interferometer. The OTS was numerically modelled and fully instrumented with triaxial accelerometers. The results of the modal analysis highlight the natural modes of the entire OTS. Both numerical and experimental methods are designed. The investigation methods are iterative. Indeed, a preliminary numerical model is created using finite element analysis (FEA). FEA results enable the determination of the dynamic range and suitable locations of accelerometers that are mounted onto the OTS for the experimental validation of the FEA model and further to carry out the transmissibility study. Natural frequencies, damping ratios, and mode shape values are obtained and scrutinized. These results are used for refining the FEA model. In fact, the lack of symmetry and the use of feet are identified as the key design feature that affects the OTS. The correlation between experimental and numerical results is within five percent for the first four modes. The results of the transmissibility study highlight the specific natural modes that influence the OTS measurement capability. Overall, the study enables to guide engineers and researchers towards a robust design using a validated and methodical approach.

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