Deflectometry-based thermal vacuum testing for a pneumatic terahertz antenna

Henry Quach, Marcos Esparza, Hyukmo Kang, Aman Chandra, Heejoo Choi, Joel Berkson, Karlene Karrfalt, Siddhartha Sirsi, Yuzuru Takashima, Art Palisoc, Jonathan W. Arenberg, Kristy Gogick Marshall, Christopher S. Glynn, Sean M. Godinez, Marcos Tafoya, Christopher Walker, Christian Drouet d’Aubigny, Daewook Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


The Orbiting Astronomical Satellite for Investigating Stellar Systems (OASIS) is a 20-meter class proposed space terahertz observatory supported by an inflatable membrane architecture. To measure 150 mm and 1m models of the A1 reflective membrane antenna, two deflectometry configurations were designed. The smaller assembly and its corresponding deflectometer were simulated, built in our laboratory, and produce a reconstructable signal for clocked measurements of the highly-sloped pneumatic surface. We use non-sequential raytracing simulation to bound the maximum contributions of all shape errors and suggest the N-Rotations algorithm to remove the remaining radially asymmetric errors. Then, the 1m prototype assembly was tested inside a thermal vacuum chamber (TVAC). Differential deflectometry measurements tracked the 1m surface shape changes as it was subjected to a variety of environmental setpoints, cycled between three inflation gases, and also during controlled puncture. We summarize our development and results for absolute measurements as well as from TVAC testing.

Original languageEnglish (US)
Title of host publicationAstronomical Optics
Subtitle of host publicationDesign, Manufacture, and Test of Space and Ground Systems III
EditorsTony B. Hull, Daewook Kim, Pascal Hallibert, Fanny Keller
ISBN (Electronic)9781510644786
StatePublished - 2021
EventAstronomical Optics: Design, Manufacture, and Test of Space and Ground Systems III 2021 - San Diego, United States
Duration: Aug 1 2021Aug 5 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceAstronomical Optics: Design, Manufacture, and Test of Space and Ground Systems III 2021
Country/TerritoryUnited States
CitySan Diego


  • Deflectometry
  • Large aperture metrology
  • Membrane inflatable mirrors
  • TVAC

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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