Fiber fed spectral calibration with the Hobby-Eberly telescope

Joseph R. Tufts, Gary J. Hill, Gordon L. Wesley, Phillip J. MacQueen, Lawrence W. Ramsey

Research output: Contribution to journalConference articlepeer-review


The Hobby-Eberly Telescope (HET) imposes unique constraints on the design of a spectral calibration system. Its 9.2 m aperture and queue scheduled operation make traditional dome screens impractical. Furthermore, the changing pupil of the HET's tilted Aricebo design is far more drastic than the simple rotation of traditional alt-azimuth telescopes. Given these constraints we elected to build an internal spectral calibration system (SCS) common to all instruments. The SCS can feed all HET instruments from a uniformly illuminated Lambertian screen located within the spherical abberation corrector (SAC) at the telescope's second pupil. A moving baffle installed at the third pupil will reproduce, during calibration, the actual HET pupil seen in a science exposure. We eliminated all heat sources at the SAC by locating the lamps in the basement below the telescope and coupling source to screen through 12 600 μm diameter 35 m long fibers.

Original languageEnglish (US)
Pages (from-to)1162-1169
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue number2
StatePublished - 2002
EventInstrument Design and Performance for Optical/Infrared Ground-based Telescopes - waikoloa, HI, United States
Duration: Aug 25 2002Aug 28 2002

All Science Journal Classification (ASJC) codes

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


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