28 July 2014 Measuring large mirrors using SCOTS: the Software Configurable Optical Test System
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Large telescope mirrors are typically measured using interferometry, which can achieve measurement accuracy of a few nanometers. However, applications of interferometry can be limited by small dynamic range, sensitivity to environment, and high cost. We have developed a range of surface measurement solutions using SCOTS, the Software Configurable Optical Test System, which illuminates the surface under test with light modulated from a digital display or moving source. The reflected light is captured and used to determine the surface slope which is integrated to provide the shape. A range of systems is presented that measures nearly all spatial scales and supports all phases of processing for large telescope mirrors.
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J. H. Burge, J. H. Burge, P. Su, P. Su, G. Butel, G. Butel, R. Huang, R. Huang, A. Maldonado, A. Maldonado, T. Su, T. Su, "Measuring large mirrors using SCOTS: the Software Configurable Optical Test System", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91510Z (28 July 2014); doi: 10.1117/12.2057726; https://doi.org/10.1117/12.2057726

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