Alignment of 4-mirror Wide Field Corrector for the Hobby-Eberly Telescope

Chang Jin Oh, Eric H. Frater, Laura Coyle, Matthew B Dubin, Andrew Lowman, Chunyu Zhao, James H Burge

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

1 Citation (Scopus)

Abstract

The Hobby-Eberly Telescope (HET) Wide Field Corrector (WFC) is a four-mirror optical system which corrects for aberrations from the 10-m segmented spherical primary mirror. The WFC mirror alignments must meet particularly tight tolerances for the system to meet performance requirements. The system uses 1-m class highly aspheric mirrors, which precludes conventional alignment methods. For the WFC system alignment a "center reference fixture" has been used as the reference for each mirror's vertex and optical axis. The center reference fixtures have both a CGH and sphere mounted retroreflector (SMR) nests. The CGH is aligned to the mirror's optical axis to provide a reference for mirror decenter and tilt. The vertex of each mirror is registered to the SMR nests on the center reference fixtures using a laser tracker. The spacing between the mirror vertices is measured during the system alignment using these SMR nest locations to determine the vertex locations. In this paper the procedures and results from creating and characterizing these center reference fixtures are presented. As a verification of proposed alignment methods the results from their application in the WFC system alignment are also presented.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIE
Volume8844
ISBN (Print)9780819496942
DOIs
StatePublished - 2013
EventOptical System Alignment, Tolerancing, and Verification VII - San Diego, CA, United States
Duration: Aug 25 2013Aug 26 2013

Other

OtherOptical System Alignment, Tolerancing, and Verification VII
CountryUnited States
CitySan Diego, CA
Period8/25/138/26/13

Fingerprint

Hobby-Eberly Telescope
Corrector
Wide-field
Telescopes
Mirror
Mirrors
Alignment
alignment
telescopes
mirrors
fixtures
retroreflectors
Nest
apexes
Vertex of a graph
Aberrations
Optical systems
Tilt
Aberration
Optical System

Keywords

  • Alignment
  • Aspheric mirror
  • Center reference fixture
  • Hobby-eberly telescope wide field corrector

ASJC Scopus subject areas

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

Cite this

Oh, C. J., Frater, E. H., Coyle, L., Dubin, M. B., Lowman, A., Zhao, C., & Burge, J. H. (2013). Alignment of 4-mirror Wide Field Corrector for the Hobby-Eberly Telescope. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 8844). [884403] SPIE. https://doi.org/10.1117/12.2023427

Alignment of 4-mirror Wide Field Corrector for the Hobby-Eberly Telescope. / Oh, Chang Jin; Frater, Eric H.; Coyle, Laura; Dubin, Matthew B; Lowman, Andrew; Zhao, Chunyu; Burge, James H.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8844 SPIE, 2013. 884403.

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

Oh, CJ, Frater, EH, Coyle, L, Dubin, MB, Lowman, A, Zhao, C & Burge, JH 2013, Alignment of 4-mirror Wide Field Corrector for the Hobby-Eberly Telescope. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 8844, 884403, SPIE, Optical System Alignment, Tolerancing, and Verification VII, San Diego, CA, United States, 8/25/13. https://doi.org/10.1117/12.2023427
Oh CJ, Frater EH, Coyle L, Dubin MB, Lowman A, Zhao C et al. Alignment of 4-mirror Wide Field Corrector for the Hobby-Eberly Telescope. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8844. SPIE. 2013. 884403 https://doi.org/10.1117/12.2023427
Oh, Chang Jin ; Frater, Eric H. ; Coyle, Laura ; Dubin, Matthew B ; Lowman, Andrew ; Zhao, Chunyu ; Burge, James H. / Alignment of 4-mirror Wide Field Corrector for the Hobby-Eberly Telescope. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 8844 SPIE, 2013.
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