@inproceedings{1a59df7e0a5d435e802c398debc46414,
title = "Deflectometry measurement of Daniel K. Inouye Solar Telescope primary mirror",
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.",
keywords = "Metrology, aspheric, calibration, deflectometry, telescope",
author = "Run Huang and Peng Su and Burge, {James H.}",
note = "Publisher Copyright: {\textcopyright} 2015 SPIE.; Optical Manufacturing and Testing XI ; Conference date: 09-08-2015 Through 11-08-2015",
year = "2015",
doi = "10.1117/12.2189258",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Ray Williamson and Fahnle, {Oliver W.} and Kim, {Dae Wook}",
booktitle = "Optical Manufacturing and Testing XI",
}