Measurements of large optical surfaces with a laser tracker

Tom L. Zobrist; James H. Burge; Warren B. Davison; Hubert M. Martin

doi:10.1117/12.789934

23 July 2008 Measurements of large optical surfaces with a laser tracker

Tom L. Zobrist, James H. Burge, Warren B. Davison, Hubert M. Martin

Author Affiliations +

Proceedings Volume 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation; 70183U (2008) https://doi.org/10.1117/12.789934
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

Surface measurements represent a significant part of the cost for manufacturing large aspheric optics. Both polished and rough ground surfaces must be measured with high precision and spatial resolution. We have developed a system that couples a commercial laser tracker with an advanced calibration technique and a system of external references. This system was built to measure the off-axis primary mirror segments for the Giant Magellan Telescope where it will guide loose abrasive grinding and initial polishing. The system is further expected to corroborate the optical interferometric tests of the completed mirrors, in several low-order aberrations. The design, analysis, calibration, and measured performance of this system will be presented.

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Tom L. Zobrist, James H. Burge, Warren B. Davison, and Hubert M. Martin "Measurements of large optical surfaces with a laser tracker", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70183U (23 July 2008); https://doi.org/10.1117/12.789934

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