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  • 1
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    Preliminary Analysis of Effect of Random Segment Errors on Coronagraph Performance (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Are we alone in the Universe is probably the most compelling science question of our generation. To answer it requires a large aperture telescope with extreme wavefront stability. To image and characterize Earth-like planets requires the ability to block 10(exp 10) of the host stars light with a 10(exp -11) stability. For an internal coronagraph, this requires correcting wavefront errors and keeping that correction stable to a few picometers rms for the duration of the science observation. This requirement places severe specifications upon the performance of the observatory, telescope and primary mirror. A key task of the AMTD project (initiated in FY12) is to define telescope level specifications traceable to science requirements and flow those specifications to the primary mirror. From a systems perspective, probably the most important question is: What is the telescope wavefront stability specification? Previously, we suggested this specification should be 10 picometers per 10 minutes; considered issues of how this specification relates to architecture, i.e. monolithic or segmented primary mirror; and asked whether it was better to have few or many segmented. This paper reviews the 10 picometers per 10 minutes specification; provides analysis related to the application of this specification to segmented apertures; and suggests that a 3 or 4 ring segmented aperture is more sensitive to segment rigid body motion that an aperture with fewer or more segments.
    Keywords: Optics
    Type: MSFC-E-DAA-TN25818-2 , Techniques and Instrumentation for Detection of Exoplanets Conference; Aug 09, 2015 - Aug 13, 2015; San Diego, CA; United States
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  • 2
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    Incorporating Skew into RMS Surface Roughness Probability Distribution (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The standard treatment of RMS surface roughness data is the application of a Gaussian probability distribution. This handling of surface roughness ignores the skew present in the surface and overestimates the most probable RMS of the surface, the mode. Using experimental data we confirm the Gaussian distribution overestimates the mode and application of an asymmetric distribution provides a better fit. Implementing the proposed asymmetric distribution into the optical manufacturing process would reduce the polishing time required to meet surface roughness specifications.
    Keywords: Optics
    Type: M13-2530 , SPIE Conference on Optical Manufacturing and Testing; Aug 25, 2013 - Aug 29, 2013; San Diego, CA
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  • 3
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    Contrast Leakage as function of Telescope Motion (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Optics
    Type: MSFC-E-DAA-TN36977 , Mirror Technology/SBIR/STTR Workshop; Nov 01, 2016 - Nov 03, 2016; Greenbelt, MD; United States
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  • 4
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    Analysis of Random Segment Errors on Coronagraph Performance (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: At 2015 SPIE O&P we presented "Preliminary Analysis of Random Segment Errors on Coronagraph Performance" Key Findings: Contrast Leakage for 4thorder Sinc2(X) coronagraph is 10X more sensitive to random segment piston than random tip/tilt, Fewer segments (i.e. 1 ring) or very many segments (〉 16 rings) has less contrast leakage as a function of piston or tip/tilt than an aperture with 2 to 4 rings of segments. Revised Findings: Piston is only 2.5X more sensitive than Tip/Tilt
    Keywords: Instrumentation and Photography
    Type: MSFC-E-DAA-TN32194
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  • 5
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    Advanced UVOIR Mirror Technology Development for Very Large Space Telescopes (2015)
    In:  CASI
    Details
    Publication Date: 2018-06-12
    Description: The Advanced Mirror Technology Development (AMTD) project is in phase 2 of a multiyear effort, initiated in FY 2012. This effort is to mature, by at least a half Technology Readiness Level step, the critical technologies required to enable 4-meter or larger ultraviolet, optical, and infrared (UVOIR) space telescope primary mirror assemblies for both general astrophysics and ultra-high contrast observations of exoplanets. AMTD continues to achieve all of its goals and has accomplished all of its milestones to date. This has been achieved by assembling an outstanding team from academia, industry, and government with extensive expertise in astrophysics and exoplanet characterization, and in the design/manufacture of monolithic and segmented space telescopes; by deriving engineering specifications for advanced normal-incidence mirror systems needed to make the required science measurements; and by defining and prioritizing the most important technical problems to be solved. Our results have been presented to the CoPAG and Mirror Tech Days 2013, and proceedings papers of the 2013 and 2014 SPIE Optics & Photonics Symposia have been published.
    Keywords: Optics
    Type: George C. Marshall Space Flight Center Research and Technology Report 2014; Stahl, H. Philip; 58-59; NASA/TM-2015-218204
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  • 6
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    James Webb Space Telescope: The First Light Machine (2007)
    In:  CASI
    Details
    Publication Date: 2018-06-12
    Description: Scheduled to begin its 10 year mission no sooner than 2013, the James Webb Space Telescope (JWST) will search for the first luminous objects of the Universe to help answer fundamental questions about how the Universe came to look like it does today. At 6.5 meters in diameter, JWST will be the world's largest space telescope. This talk reviews science objectives for JWST and how they drive the JWST architecture, e.g. aperture, wavelength range and operating temperature. Additionally, the talk provides an overview of the JWST primary mirror technology development and fabrication status.
    Keywords: Instrumentation and Photography
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  • 7
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    Beyond JWST: Mirror Technology (2013)
    In:  Other Sources
    Details
    Publication Date: 2018-06-11
    Description: No abstract available
    Keywords: Optics
    Format: text
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  • 8
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    Optical Design Process and Comparison for ATLAST Concepts (2010)
    In:  CASI
    Details
    Publication Date: 2018-08-10
    Description: The ATLAST (Advanced Technology for Large Aperture Space Telescopes) effort has presented several design incarnations. Here we will discus the design process in detail and compare the design and performance of the 9.2m segmented, the 8m monolithic on-axis and 8m x 6m off-axis concepts
    Keywords: Optics
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  • 9
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    Comparative Concepts for ATLAST Optical Designs (2010)
    In:  CASI
    Details
    Publication Date: 2018-08-10
    Description: The ATLAST (Advanced Technology for Large Aperture Space Telescopes) effort has presented several design incarnations. Here we will compare the design and performance of the 9.2m segmented, the 8m monolithic on-axis and 8m x 6m off-axis concepts.
    Keywords: Optics
    Format: application/pdf
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  • 10
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    MSFC/UAH Full Aperture Cryo-Figure AMSD Modal Characterization (2002)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: A full-aperture, interferometric method for measuring the modal characteristics of the Advanced Mirror System Demonstrators (AMSDs) will be presented. The method involves stroboscopic surface figure measurement using an interferometer capable of simultaneous phase-shift measurements. Results of bread-board experiments will be presented as well as the plan for cryo measurements of the AMSDs.
    Keywords: Optics
    Type: 2nd Annual Technology Days; May 22, 2002 - May 24, 2002; Huntsville, AL; United States
    Format: text
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