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27 August 2015 Deflectometry measurement of Daniel K. Inouye Solar Telescope primary mirror
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Abstract
SCOTS (Software Configurable Optical Test System) is a high-precision slope measurement technique based on deflectometry. It utilizes a well-calibrated commercial LCD screen and a diffraction-limited camera to provide high dynamic range, non-contact and full-field metrology of reflective/refractive optics of high accuracy but low cost. Recently, we applied this metrology method on the fabrication of the primary mirror of Daniel K. Inouye Solar Telescope (DKIST), which is a 4.2 meter off-axis parabolic segment with more than 8 mm peak-to-valley aspheric departure. Sophisticated calibrations and compensations including camera mapping, screen nonlinearity and screen shape deformation are performed to achieve high accuracy measurement results. By measuring the mirror at different orientations, non-symmetrical systematic errors are eliminated. The metrology system also includes dual cameras that provide self- verification test. The measurement results are being used to guide the fabrication process.
© (2015) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Run Huang, Peng Su, and James H. Burge "Deflectometry measurement of Daniel K. Inouye Solar Telescope primary mirror", Proc. SPIE 9575, Optical Manufacturing and Testing XI, 957515 (27 August 2015); https://doi.org/10.1117/12.2189258
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