10.1364/OE.24.027993.v002 Isaac Trumper Isaac Trumper Heejoo Choi Heejoo Choi Dae Wook Kim Dae Wook Kim Visualization 2: Instantaneous phase shifting deflectometry Optica Publishing Group 2016 Visualization oe Instantaneou Optics Express 28 November 2016 phase deflectometry Trefoil Mode Case Metrology 2016-11-28 00:00:00 Media https://opticapublishing.figshare.com/articles/media/Visualization_2_Instantaneous_phase_shifting_deflectometry/4950233 Trefoil Mode Case Metrology Originally published in Optics Express on 28 November 2016 (oe-24-24-27993)