论文信息 - Laser tracker surface measurements of the 8.4 m GMT primary mirror segment

Laser tracker surface measurements of the 8.4 m GMT primary mirror segment

We have developed a metrology system that is capable of measuring rough ground and polished surfaces alike, is nearly independent of the nominal surface shape, and can accommodate surfaces up to 8.4 m in diameter. The system couples a commercial laser tracker with an advanced calibration technique and a system of external references. This system was built to guide loose abrasive grinding and initial polishing of the off-axis primary mirror segments for the Giant Magellan Telescope, and will be used to guide the fabrication of the Large Synoptic Survey Telescope primary and tertiary mirrors as well. The results obtained using this system during the fabrication of the first segment of the Giant Magellan Telescope are presented along with an assessment of the expected system accuracy.

Tom L. Zobrist | James H. Burge | Hubert M. Martin

[1] James H. Burge,et al. Development of surface metrology for the Giant Magellan Telescope primary mirror , 2008, Astronomical Telescopes + Instrumentation.

[2] Tom L. Zobrist,et al. Measurements of large optical surfaces with a laser tracker , 2008, Astronomical Telescopes + Instrumentation.

[3] S. M. Miller,et al. Progress in manufacturing the first 8.4 m off-axis segment for the Giant Magellan Telescope , 2008, Astronomical Telescopes + Instrumentation.

[4] Eli Atad-Ettedgui,et al. Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation , 2008 .

[5] L. B. Kot,et al. Alternate surface measurements for GMT primary mirror segments , 2006, SPIE Astronomical Telescopes + Instrumentation.

[6] Chunyu Zhao,et al. Orthonormal vector polynomials in a unit circle, Part II : Completing the basis set. , 2008, Optics express.

[7] James H. Burge,et al. Manufacture of a 1.7m prototype of the GMT primary mirror segments , 2006, SPIE Astronomical Telescopes + Instrumentation.

[8] Matt Johns. Progress on the GMT , 2008, Astronomical Telescopes + Instrumentation.

[9] Chunyu Zhao,et al. Orthonormal vector polynomials in a unit circle, Part I: Basis set derived from gradients of Zernike polynomials. , 2007, Optics express.