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  • 1
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    Visible Nulling Coronagraphy Testbed Development for Exoplanet Detection (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Three of the recently completed NASA Astrophysics Strategic Mission Concept (ASMC) studies addressed the feasibility of using a Visible Nulling Coronagraph (VNC) as the prime instrument for exoplanet science. The VNC approach is one of the few approaches that works with filled, segmented and sparse or diluted aperture telescope systems and thus spans the space of potential ASMC exoplanet missions. NASA/Goddard Space Flight Center (GSFC) has a well-established effort to develop VNC technologies and has developed an incremental sequence of VNC testbeds to advance the this approach and the technologies associated with it. Herein we report on the continued development of the vacuum Visible Nulling Coronagraph testbed (VNT). The VNT is an ultra-stable vibration isolated testbed that operates under high bandwidth closed-loop control within a vacuum chamber. It will be used to achieve an incremental sequence of three visible light nulling milestones of sequentially higher contrasts of 10(exp 8) , 10(exp 9) and 10(exp 10) at an inner working angle of 2*lambda/D and ultimately culminate in spectrally broadband (〉20%) high contrast imaging. Each of the milestones, one per year, is traceable to one or more of the ASMC studies. The VNT uses a modified Mach-Zehnder nulling interferometer, modified with a modified "W" configuration to accommodate a hex-packed MEMS based deformable mirror, a coherent fiber bundle and achromatic phase shifters. Discussed will be the optical configuration laboratory results, critical technologies and the null sensing and control approach.
    Keywords: Astronomy
    Type: GSFC.CPR.4898.2011 , SPIE 7731, Astronomical Telescopes and Instrumentation; Jun 01, 2010; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Vacuum Nuller Testbed (VNT) Performance, Characterization and Null Control: Progress Report (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Herein we report on the development. sensing and control and our first results with the Vacuum Nuller Testbed to realize a Visible Nulling Coronagraph (VNC) for exoplanet coronagraphy. The VNC is one of the few approaches that works with filled. segmented and sparse or diluted-aperture telescope systems. It thus spans a range of potential future NASA telescopes and could be Hown as a separate instrument on such a future mission. NASA/Goddard Space Flight Center (GSFC) has a well-established effort to develop VNC technologies. and has developed an incremental sequence of VNC testbeds to advance this approach and the enabling technologies associated with it. We discuss the continued development of the vacuum Visible Nulling Coronagraph testbed (VNT). Tbe VNT is an ultra-stable vibration isolated testbed that operates under closed-loop control within a vacuum chamber. It will be used to achieve an incremental sequence of three visible-light nulling milestones with sequentially higher contrasts of 10(sup 8), 10(sup 9) and ideally 10(sup 10) at an inner working angle of 2*lambda/D. The VNT is based on a modified Mach-Zehnder nulling interferometer, with a "W" configuration to accommodate a hex-packed MEMS based deformable mirror, a coherent fiber bundle and achromatic phase shifters. We discuss the initial laboratory results, the optical configuration, critical technologies and the null sensing and control approach.
    Keywords: Lunar and Planetary Science and Exploration
    Type: GSFC.O.5212.2011 , SPIE 2011; Aug 21, 2011 - Aug 25, 2011; San Diego, CA; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Subscale Beryllium Mirrors Demonstrator (SBMD) Program Summary and Ball Modeling (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The SBMD Program was to design, fabricate, and test a 0.5-m beryllium lightweighted mirror applicable to space deployable systems with demanding optical and areal density requirements. This presentation summarizes the program's objectives and the mirror's tested technical performance along with lessons learned. In addition, test results are compared to modeling predictions. The SBMD Program was funded by NASA MSFC.
    Keywords: Optics
    Type: MSFC Technology Days; May 09, 2001 - May 10, 2001; Huntsville, AL; United States
    Format: text
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  • 4
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    Ball Semi-Rigid Advanced Mirror System Demonstrator (AMSD) (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: The AMSD Program is to design, fabricate, and test a 1.4-m point-to-point hexagon mirror system. The Ball semi-rigid approach will be described and its current status presented, The mirror system includes a lightweighted beryllium mirror that is attached through flexures and actuators to a composite reaction structure enabling optical performance at ambient and cryogenic temperatures and allowing changes of curvature to be imposed via actuation. This program is administered through NASA MSFC and is jointly funded by NASA, the USAF, and the NRO.
    Keywords: Optics
    Type: MSFC Technology Days; May 09, 2001 - May 10, 2001; Huntsville, AL; United States
    Format: text
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  • 5
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    UV Capabilities of the CETUS Multi-Object Spectrometer (MOS) and NUV/FUV Camera (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Cosmic Evolution Through UV Spectroscopy (CETUS) concept enables parallel observations by the UV multiobject spectrometer (MOS) and near-UV/far-UV camera which operate simultaneously but independently with their separate field of views. The near-UV MOS can target up to 100 objects at a time without confusion with nearby sources or background zodiacal light. This multiplexing will allow over 100,000 galaxies to be observed over a typical mission lifetime. The MOS includes a next-generation micro-shutter array (NGMSA), an efficient aspheric Offner-like spectrometer design with a convex grating, and nanotube light traps for suppressing unwanted wavelengths. The NUV/FUV Camera has the capability to image in a range of sub-bands from 115-400 nm at the same time the MOS is operating at 180-350 nm. The UV camera has a similar Offner-like relay, selectable filters, and two separate detectors to optimize observing in either the far-UV (115-175 nm) or the near-UV (180-400 nm) utilizing a CsI Micro-Channel Plate detector (MCP) and a CCD respectively.
    Keywords: Astronomy
    Type: GSFC-E-DAA-TN64839 , SPIE Astronomical Telescopes + Instrumentation; Jun 10, 2018 - Jun 15, 2018; Austin, TX; United States|Proceedings of SPIE, Space Telescopes and Instrumentation 2018: Ultraviolet to Gamma Ray (ISSN 0277-786X) (e-ISSN 1996-756X); 10699; 1069939
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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