13 May 2013 Precision aspheric optics testing with SCOTS: a deflectometry approach
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Absolute measurement with SCOTS/deflectometry is a calibration problem. We use a laser tracker to calibrate the test geometry. The performance id demonstrated with the initial measurement results from the Large Synoptic Survey Telescope tertiary mirror. Systematic errors from the camera are carefully controlled. Camera pupil imaging aberration is removed with an external aperture stop. Imaging aberration and other inherent errors are suppressed with a rotation test. Results show that the SCOTS can act as a large dynamic range, high precision, non-null test method for precision aspheric optics. The SCOTS test can achieve measurement accuracy comparable with the traditional interferometric testing.
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Peng Su, Peng Su, Manal Khreishi, Manal Khreishi, Run Huang, Run Huang, Tianquan Su, Tianquan Su, James H. Burge, James H. Burge, } "Precision aspheric optics testing with SCOTS: a deflectometry approach", Proc. SPIE 8788, Optical Measurement Systems for Industrial Inspection VIII, 87881E (13 May 2013); doi: 10.1117/12.2020721; https://doi.org/10.1117/12.2020721

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