Manufacture of the second 8.4 m primary mirror for the Large Binocular Telescope

H. M. Martin, R. G. Allen, B. Cuerden, J. M. Hill, D. A. Ketelsen, S. M. Miller, Jose M Sasian, M. T. Tuell, S. Warner

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

20 Citations (Scopus)

Abstract

The second 8.4 m primary mirror and its active support system were delivered to the Large Binocular Telescope in September 2005. The mirror was figured to an accuracy of 15 nm rms surface after subtraction of low-order aberrations that will be controlled by the active support. The mirror was installed into its operational support cell in the lab, and support forces were optimized to produce a figure accurate to 20 nm rms surface with no synthetic correction. The mirror was polished on a new 8.4 m polishing machine that gives the Mirror Lab the capacity to process up to four 8.4 m mirrors simultaneously, with each mirror going through a sequence of stations: casting furnace, generating machine, polishing machine, and integration with its support cell. The new polishing machine has two carriages for polishing tools, allowing use of two 1.2 m stressed laps during loose-abrasive grinding and early polishing, followed by final figuring with a stressed lap and a small tool for local figuring.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Volume6273 I
DOIs
StatePublished - 2006
EventOptomechanical Technologies for Astronomy - Orlando, FL, United States
Duration: May 24 2006May 31 2006

Other

OtherOptomechanical Technologies for Astronomy
CountryUnited States
CityOrlando, FL
Period5/24/065/31/06

Fingerprint

Binoculars
Telescopes
Mirrors
Polishing machines
telescopes
polishing
mirrors
Polishing
carriages
support systems
Aberrations
abrasives
grinding
cells
subtraction
Casting
Furnaces
furnaces
aberration
stations

Keywords

  • Active optics
  • Optical fabrication
  • Optical testing
  • Telescopes

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Martin, H. M., Allen, R. G., Cuerden, B., Hill, J. M., Ketelsen, D. A., Miller, S. M., ... Warner, S. (2006). Manufacture of the second 8.4 m primary mirror for the Large Binocular Telescope. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 6273 I). [62730C] https://doi.org/10.1117/12.672454

Manufacture of the second 8.4 m primary mirror for the Large Binocular Telescope. / Martin, H. M.; Allen, R. G.; Cuerden, B.; Hill, J. M.; Ketelsen, D. A.; Miller, S. M.; Sasian, Jose M; Tuell, M. T.; Warner, S.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6273 I 2006. 62730C.

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

Martin, HM, Allen, RG, Cuerden, B, Hill, JM, Ketelsen, DA, Miller, SM, Sasian, JM, Tuell, MT & Warner, S 2006, Manufacture of the second 8.4 m primary mirror for the Large Binocular Telescope. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 6273 I, 62730C, Optomechanical Technologies for Astronomy, Orlando, FL, United States, 5/24/06. https://doi.org/10.1117/12.672454
Martin HM, Allen RG, Cuerden B, Hill JM, Ketelsen DA, Miller SM et al. Manufacture of the second 8.4 m primary mirror for the Large Binocular Telescope. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6273 I. 2006. 62730C https://doi.org/10.1117/12.672454
Martin, H. M. ; Allen, R. G. ; Cuerden, B. ; Hill, J. M. ; Ketelsen, D. A. ; Miller, S. M. ; Sasian, Jose M ; Tuell, M. T. ; Warner, S. / Manufacture of the second 8.4 m primary mirror for the Large Binocular Telescope. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 6273 I 2006.
@inproceedings{127cde6492ef4200a2055ed17bd92074,
title = "Manufacture of the second 8.4 m primary mirror for the Large Binocular Telescope",
abstract = "The second 8.4 m primary mirror and its active support system were delivered to the Large Binocular Telescope in September 2005. The mirror was figured to an accuracy of 15 nm rms surface after subtraction of low-order aberrations that will be controlled by the active support. The mirror was installed into its operational support cell in the lab, and support forces were optimized to produce a figure accurate to 20 nm rms surface with no synthetic correction. The mirror was polished on a new 8.4 m polishing machine that gives the Mirror Lab the capacity to process up to four 8.4 m mirrors simultaneously, with each mirror going through a sequence of stations: casting furnace, generating machine, polishing machine, and integration with its support cell. The new polishing machine has two carriages for polishing tools, allowing use of two 1.2 m stressed laps during loose-abrasive grinding and early polishing, followed by final figuring with a stressed lap and a small tool for local figuring.",
keywords = "Active optics, Optical fabrication, Optical testing, Telescopes",
author = "Martin, {H. M.} and Allen, {R. G.} and B. Cuerden and Hill, {J. M.} and Ketelsen, {D. A.} and Miller, {S. M.} and Sasian, {Jose M} and Tuell, {M. T.} and S. Warner",
year = "2006",
doi = "10.1117/12.672454",
language = "English (US)",
isbn = "0819463388",
volume = "6273 I",
booktitle = "Proceedings of SPIE - The International Society for Optical Engineering",

}

TY - GEN

T1 - Manufacture of the second 8.4 m primary mirror for the Large Binocular Telescope

AU - Martin, H. M.

AU - Allen, R. G.

AU - Cuerden, B.

AU - Hill, J. M.

AU - Ketelsen, D. A.

AU - Miller, S. M.

AU - Sasian, Jose M

AU - Tuell, M. T.

AU - Warner, S.

PY - 2006

Y1 - 2006

N2 - The second 8.4 m primary mirror and its active support system were delivered to the Large Binocular Telescope in September 2005. The mirror was figured to an accuracy of 15 nm rms surface after subtraction of low-order aberrations that will be controlled by the active support. The mirror was installed into its operational support cell in the lab, and support forces were optimized to produce a figure accurate to 20 nm rms surface with no synthetic correction. The mirror was polished on a new 8.4 m polishing machine that gives the Mirror Lab the capacity to process up to four 8.4 m mirrors simultaneously, with each mirror going through a sequence of stations: casting furnace, generating machine, polishing machine, and integration with its support cell. The new polishing machine has two carriages for polishing tools, allowing use of two 1.2 m stressed laps during loose-abrasive grinding and early polishing, followed by final figuring with a stressed lap and a small tool for local figuring.

AB - The second 8.4 m primary mirror and its active support system were delivered to the Large Binocular Telescope in September 2005. The mirror was figured to an accuracy of 15 nm rms surface after subtraction of low-order aberrations that will be controlled by the active support. The mirror was installed into its operational support cell in the lab, and support forces were optimized to produce a figure accurate to 20 nm rms surface with no synthetic correction. The mirror was polished on a new 8.4 m polishing machine that gives the Mirror Lab the capacity to process up to four 8.4 m mirrors simultaneously, with each mirror going through a sequence of stations: casting furnace, generating machine, polishing machine, and integration with its support cell. The new polishing machine has two carriages for polishing tools, allowing use of two 1.2 m stressed laps during loose-abrasive grinding and early polishing, followed by final figuring with a stressed lap and a small tool for local figuring.

KW - Active optics

KW - Optical fabrication

KW - Optical testing

KW - Telescopes

UR - http://www.scopus.com/inward/record.url?scp=33749011818&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33749011818&partnerID=8YFLogxK

U2 - 10.1117/12.672454

DO - 10.1117/12.672454

M3 - Conference contribution

AN - SCOPUS:33749011818

SN - 0819463388

SN - 9780819463388

VL - 6273 I

BT - Proceedings of SPIE - The International Society for Optical Engineering

ER -