&lt;title&gt;Structural analysis of a 50-cm-diameter open-back triangular cell beryllium mirror in a cryogenic environment&lt;/title&gt;

Craig, Lawrence Donald; Cline, Todd; Hadaway, James B.; Nein, M. E.; Smithers, Martin E.; Keidel, John W.; Stahl, H. Philip

doi:10.1117/12.447325

Cited by 2 publications

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“…Although the model of the primary mirror did not include solid elements it is similar in nature to other cryogenic optical models. [10] Minor corrections were made to the finite element model, but no oversights in modeling were discovered. The most important influence on the accuracy of the prediction of the ΔBFL was the material strain data.…”

Section: Discussionmentioning

confidence: 99%

Herschel Space Telescope: Optical test and model correlation

Doyle

2009

2009 IEEE Aerospace Conference

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Subsequent to the cyrogenic optical testing of the 3.5 m silicon carbide ESA Herschel Space Telescope, a discrepancy between the prediction and measurement of the telescope back focal length was identified. Efforts to resolve this discrepancy involved both improvements to modeling and more thorough examination of the optical test techniques. The most significant input to modeling was the use of extremely precise cryogenic strain measurements. The optical test methods were extensively analyzed for accuracy, sensitivity, and systematic errors. Model results, error budgets, test results, and conclusions will be presented and discussed. 1, 2

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Section: Discussionmentioning

confidence: 99%

Herschel Space Telescope: Optical test and model correlation

Doyle

2009

2009 IEEE Aerospace Conference

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“…After several design iterations, how to properly model the cryo-quilting was learned. 18 Using this knowledge, new rules were defined for how to design lightweight beryllium mirrors without cryo-quilting. These new design rules were successfully proven on AMSD.…”

Section: Subscale Beryllium Mirror Demonstratormentioning

confidence: 99%

“…The tests showed that the surface figure was repeatable to within the noise floor of the metrology system, 14 nm rms (Figs. [17][18][19]. Astigmatism and power figure terms were removed from the total surface change measurement because they can be compensated for on-orbit by adjusting the PMSA ROC or physical location via the cryogenic hexapod with the ROC actuator.…”

Section: Requirements Verificationmentioning

confidence: 99%

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Webb Space Telescope primary mirror development: summary and lessons learned

Stahl

2024

J. Astron. Telesc. Instrum. Syst.

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The primary mirror is central to the success of the Webb Space Telescope and the product of 100s of engineers and technologists who invented technologies and processes for its manufacture and test. We summarize the Webb mirror technology development program, explain how the technology was demonstrated to be TRL-6 (including the importance of an Engineering Development Unit), and list some of the author's personal lessons learned.

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<title>Structural analysis of a 50-cm-diameter open-back triangular cell beryllium mirror in a cryogenic environment</title>

Cited by 2 publications

References 1 publication

Herschel Space Telescope: Optical test and model correlation

Herschel Space Telescope: Optical test and model correlation

Webb Space Telescope primary mirror development: summary and lessons learned

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