SIRTF-CTA optical performance test results

J. P. Schwenker, B. R. Brandl, W. F. Hoffmann, J. L. Hora, A. K. Mainzer, J. E. Mentzell, J. E. Van Cleve

Research output: Contribution to journalConference articlepeer-review

16 Scopus citations


This paper describes the principal optical results of the "End to End" test conducted on the SIRTF Cryogenic Telescope Assembly. Test system focus was located using images from the shortest wavelength science instrument, IRAC, much as it will be on-orbit. Deep out-of-focus images were used to determine the system wavefront by Phase Retrieval methods with heritage to Hubble Space Telescope work. This work has been used to update the SIRTF optical models and aid in predicting the on-orbit performance of the observatory. Images made with other assemblies able to observe in the test (IRS, PCRS) were used to verify their function and co-focus to the IRAC established position. Image jitter was analyzed warm and cold, with visible images captured by the PCRS instrument and cold, with images captured by the IRAC instrument.

Original languageEnglish (US)
Pages (from-to)30-41
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue number1
StatePublished - 2002
Externally publishedYes
EventIR Space Telescopes and Instruments - waikoloa, HI, United States
Duration: Aug 24 2002Aug 28 2002


  • Cryogenic
  • Focus
  • Infrared
  • Liquid helium
  • Telescope
  • Thermal vac
  • Wavefront

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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