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SPIE 2003

Proceedings of SPIE conference on Astronomical Adaptive Optics Systems and Applications, 5169, (2003: Annual Meeting in San Diego)

Adaptive secondary mirrors for the Large Binocular Telescope
A. Riccardi, et al.

Abstract: The two 911mm-diameter adaptive secondary (AS) mirrors for the Large Binocular telescope (LBT) are currently under construction. The design of the units has been based on the extensive experience made on the MMT adaptive secondary mirror during laboratory tests and telescope runs. Mechanics, electronics and control logic have been revised to improve performances and reliability. Each unit has 672 electro-magnetic force actuators. They control the figure of the Gregorian secondary 1.6mm-thick mirrors with an internal loop using the signal of co-located capacitive sensors. The improvement in the computational power of the on-board control electronics allows to use it as real-time computer for wavefront reconstruction. We present the progress of the final unit construction and the preliminary laboratory results obtained with a 45-actuator sub-system used to test the new features introduced in the electronics and mechanics of LBT adaptive secondary mirrors.

PDF version of the paper (1200 kB)
Powerpoint Presentation (40 MB)

 
SPIE 1998

Proceedings of SPIE conference on Advanced Technology Optical/IR Telescopes VI, 3352, (1998)

1. The Large Binocular Telescope Project, pp. 23-33
J. M. Hill & P. Salinari
Compressed PostScript version: B&W (3460 kB) or Color (10652 kB)

2. Casting the first 8.4 meter borosilicate honeycomb mirror for the Large Binocular Telescope, pp. 172-181
J. M. Hill, J. R. P. Angel, R. D. Lutz, B. H. Olbert & P. A. Strittmatter
Compressed PostScript version: B&W (3008 kB) or Color (9695 kB)

3. Management and construction of the Large Binocular Telescope enclosure: meeting unusual challenges with a competitive discipline, pp. 334-343
James H. Slagle, J. M. Hill, W. B. Davison, Wood Hart & Jose Teran U.
Compressed PostScript version: B&W (4954 kB) or Color (15579 kB)

4. Handling 20 tons of honeycomb mirror with a very gentle touch, pp. 216-225
W. B. Davison, J. M. Hill & J. T. Williams

5. The performances of the LBT telescope after the main structure optimization, pp. 365-377
G. Marchiori, G. Rigato, A. Zanon, F. Rampini, J. Hill & P. Salinari

6. Fabrication and measured quality of the MMT primary mirror, pp. 194-204
H. M. Martin, R. G. Allen, J. R. P. Angel, J. H. Burge, W. B. Davison, S. T. DeRigne, L. R. Dettmann, D. A. Ketelesen, W. C. Kittrell, S. M. Miller, P. A. Strittmatter, S. C. West

Proceedings of SPIE conference on Astronomical Interferometry, 3350, (1998)

1. Interferometry with the Large Binocular Telescope, pp. 881-889
J. R. P. Angel, J. M. Hill, P. A. Strittmatter, P. Salinari & Gerd Weigelt

Other Conferences

1. Design of null test optics for an 8.4-m, f/1.1 paraboloidal mirror
J. H. Burge (in press)

 
SPIE 1997

Proceedings of SPIE conference on Telescope Control Systems II, 3112, (1997)

1. A feasibility study of the active control of the position actuators for the 8.4 m honeycomb primary mirrors.
L. Miglietta, V. Biliotti, C. Braccesi and V. Pante

Compressed PostScript version only

Proceedings of SPIE conference on Optical Manufacturing and Testing II, 3134, (1997)

1. Demonstration of accuracy and flexibility of using CGH test plates for measuring aspheric surfaces.
J. H. Burge, M. J. Fehinger and G. C. Cole

2. Fabrication of large secondary mirrors for astronomical telescopes.
B. K. Smith, J. H. Burge and H. M. Martin

 
SPIE 1996

Proceedings of SPIE conference on Optical Telescopes of Today and Tomorrow, 2871, (1996)

1. The Large Binocular Telescope Project, pp. 57-68
J. M. Hill
Compressed PostScript version: spielbt.ps.Z

2. The Large Binocular Telescope Interferometer
P. Salinari
Compressed PostScript version: salinari.ps.Z

3. LBT primary mirrors: the final design of the supporting system
G. Parodi

4. The Final Design of the Large Binocular Telescope M1 Mirror Cells
L. Miglietta
Compressed PostScript version: hven.ps.Z

5. Support and Actuation of Six Secondaries for the 6.5 m. MMT and 8.4 m LBT Telescopes
P.M. Gray, S.C. West, W. Gallieni

6. Measurement of large convex aspheres
J.H. Burge

7. Toward first light for the 6.5 m. MMT telescope, pp. 38-48
S.C. West, S. Callahan, F.H. Chaffe, W. Davison, S. DeRigne, D. Fabricant, C.B. Foltz, J.M. Hill, R.H. Nagel, A. Poyner, J.T. Williams

8. Fabrication of the 6.5 m. primary mirror for the Multiple Mirror Telescope Conversion
H.M. Martin, J.H. Burge, D. A Ketelsen, S.C. West
Compressed PostScript version only: fabric.ps.Z

9. Design of the 6.5 m. MMT adaptive optics system, and results from its prototype system FASTTRAC II
M. Lloyd-Hart, J.R.P. Angel, D.G. Sandler, T.D. Groesbeck, T. Martinez, B.P. Jacobsen

10. MMT adaptive secondary mirror prototype performance
D.G. Bruns, T.K. Barrett, D.G. Sandler, G. Brusa, H.M. Martin, J.R. P. Angel

11. Magellan 6.5 M. Telescopes Project: Status Report
Matt Johns

12. Progress at the Vatican Advanced Technology Telescope
S.C. West, R.H. Nagel, D. Harvey, A. Brar, B. Phillips, J.Ray, T.J. Trebisky, R. Cromwell, N.J. Woolf, C. Corbally, R. Boyle, D. Blanco, R. Otten

 
SPIE 1995

1. Fizeau interferometry for large convex surfaces
J. H. Burge, Proc. SPIE 2536, 127-138 (1995).

2. Applications of computer-generated holograms for interferometric measurement of large aspheric optics
J. H. Burge, Proc. SPIE 2576, 258-269 (1995).

3. Simulation of aperture synthesis with the Large Binocular Telescope
E. K. Hege, J. R. P. Angel, M. Cheselka & M. Lloyd-Hart, Proc. SPIE 2566, 144-155 (1995).

 
SPIE 1994

Proceedings of SPIE conference on Amplitude and Intensity Spatial Interferometry II, 2200, (1994)

1. Optical design for interferometry with the Large Binocular Telescope, p. 446
Paul Byard and Domenico Bonaccini

2. Atmospheric Limitations on Speckle Astrometry with Large Telescopes, p. 422
Richard Dekany, Keith Hege, Matt Cheselka, Roger Angel, and James Beletic

3. Strategy for interferometry with the Large Binocular Telescope, p. 248
J. M. Hill

Proceedings of SPIE conference on Advanced Technology Optical Telescopes V, 2199, (1994)

1. Casting 6.5 meter mirrors for the MMT Conversion and Magellan, p. 144
B. Olbert, J. R. P. Angel, J. M. Hill, and S. F. Hinman

2. Full-aperture interferometric test of convex secondary mirrors
using holographic test plates, p. 181
J. H. Burge and D. S. Anderson

3. Measurement of a convex secondary mirror using a holographic test plate, p. 193
J. H. Burge, D. S. Anderson, T. D. Milster, and C. L. Vernold

4. Active supports and force optimization for a 3.5-m honeycomb sandwich mirror, p. 251
H. M. Martin, W. B. Davison, S. T. DeRigne, J. M. Hill, B. B. Hille, R. L. Meeks, T. J. Trebisky

5. Rapid fabrication strategies for primary and secondary mirrors at Steward Observatory Mirror Laboratory, p. 199
D. Anderson, H. Martin, J. Burge, D. Ketelsen, and S. West

6. Optomechanics of the Large Binocular Telescope, p.64
J. M. Hill

7. Support of large borosilicate honeycomb mirrors, p. 691
P. Gray, J. M. Hill, and W. B. Davison

8. The enclosure of the Large Binocular Telescope, p. 442
P. Salinari
Compressed PostScript version only: spieencl.ps.Z

9. The mechanical design of the Large Binocular Telescope, p. 773
Ciro Del Vecchio and Luciano Miglietta

10. Machine for complete fabrication of 8-m-class mirrors, p. 651
D. A. Ketelsen, W. B. Davison, S. T. DeRigne, R. A. Cordova, and W. C. Kittrell

Proceedings of SPIE conference on Instrumentation in Astronomy VIII, 2198, (1994)

1. Design and model demonstration of a camera to remove the infrared OH
background from two dimensional images, p. 757
R. Content and R. Angel

2. Improving CCD quantum efficiency, p. 782
M. P. Lesser

Proceedings of SPIE conference on Adaptive Optics in Astronomy, 2201, (1994)

1. Measurement of focus and off-axis anisoplanatism using a sodium
resonance beacon and binary stars, p. 284
M. Lloyd-Hart, B. Jacobsen, R. Angel, R. Dekany, B. Carter, W. Wild, E. Kibblewhite, and J. Beletic

2. Preliminary closed-loop results from an adaptive optics system using a sodium resonance guide star, p. 364
M. Lloyd-Hart, R. Angel, B. Jacobsen, D. Wittman, D. McCarthy, E. Kibblewhite, B. Carter, and W. Wild

3. Wavefront reconstruction by machine learning, using the delta rule, p. 629
J. R. P. Angel

4. Field evaluation of two continuous-wave dye laser systems optimized for sodium beacon excitation, p. 342
Bruce Jacobsen, Ty Martinez, Roger Angel, Michael Lloyd-Hart, Steve Benda, Dave Middleton, Herb Friedman, and Gayler Erbert

5. Adaptive optics for the 6.5 m single-mirror conversion of the Multiple Mirror Telescope, p. 407
D. G. Sandler, S. Stahl, J. R. P. Angel, and M. Lloyd-Hart

 
SPIE 1993

Proceedings of SPIE conference on Quality and Reliability for Optical Systems, 1993, (1993)

1. A Null Test for Null Correctors: Error Analysis, p. 86
Jim Burge

Proceedings of SPIE conference on Advanced Optical Manufacturing and Testing IV, 1994, (1993)

1. Certification of Null Correctors for Primary Mirrors, p. 248
Jim Burge

2. Fabrication and Testing of the 3.5 m, f/1.75 WIYN Primary Mirror, p. 193
D. Anderson, J. Burge, D. Ketelsen, B. Martin, S. West, G. Poczulp, J. Richardson, and W. Wong

 
SPIE 1990

Proceedings of SPIE conference on Advanced Technology Optical Telescopes IV, 1236, (1990)

1. Columbus Project Telescope, p. 71
Peter Strittmatter

2. Optical Design, Error Budget and Specifications for the Columbus Project Telescope, p. 86
J. M. Hill

3. Filled Aperture Telescopes in the Next Millennium, p. 204
J. R. P. Angel

4. Interferometric Testing of Large Optics in the Presence of Vibration, p. 641
Peter L. Wizinowich and D'nardo Colucci

5. System for Precise Temperature Sensing and Thermal Control of Borosilicate Honeycomb Mirrors During Polishing and Testing, p. 844
Michael Lloyd-Hart

6. Design Strategies for Very Large Telescopes, p. 878
Warren Davison

7. Evaporative Coating Systems for Very Large Astronomical Mirrors (Abstract only) p. 940
Barry A. Sabol, Bruce Atwood, J. M. Hill, J. T. Williams, Michael P. Lesser, Paul L. Byard, Warren B. Davison

8. Progress Toward Making Lightweight 8 m Mirrors of Short Focal Length, p. 636
J. R. P. Angel, W. B. Davison, J. M. Hill, E. J. Mannery, and H. M. Martin

9. Progress in the Stressed-Lap Polishing of a 1.8-m f/1 Mirror, p.682
H.M. Martin, D.S. Anderson, J.R.P. Angel, R.H. Nagel, S.C. West

Proceedings of SPIE conference on Instrumentation in Astronomy VII, 1235, (1990)

1. A Control System for Spincasting 8 meter Borosilicate Honeycomb Mirrors, p. 486
J. M. Hill, M. R. Hunten, K. J. Johnson, D. Mitchell, Skip Schaller and R. S. Esterline

 
SPIE 1987

Proceedings of SPIE conference on Structural Mechanics of Optical Systems II, 748, 31, 1987

1. Structural Innovations in the Columbus Project: an 11.3 meter optical telescope
Warren Davison