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- W2933395948 abstract "Surface topography evaluation from measured surface slopes is critical in many engineering applications, including metrology of electronic substrates, optical elements, and small deformation measurement of engineering structures subjected to external thermomechanical stimuli. A recently proposed noncontact full-field optical method called reflection-mode digital gradient sensing (r-DGS) is able to measure small angular deflections of light rays proportional to two orthogonal surface slopes. It has been shown that submicron scale deformations can be detected by processing the slope data using a robust numerical integration scheme called the higher-order finite-difference-based least-squares integration. However, the smallest measurable deformations and the associated accuracy are yet to be determined. In our work, this very issue is addressed by carrying out experiments at temporally different recording frequencies, namely (a) ultrahigh-speed digital photography at 106 frames per second (fps) and (b) slow recording speeds of 101 fps. The results show that r-DGS is able to measure submicron out-of-plane deformations under latter conditions and nanoscale deformations in the former conditions." @default.
- W2933395948 created "2019-04-11" @default.
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- W2933395948 date "2019-04-05" @default.
- W2933395948 modified "2023-09-24" @default.
- W2933395948 title "Reflection-mode digital gradient sensing method: measurement accuracy" @default.
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- W2933395948 doi "https://doi.org/10.1117/1.oe.58.4.044101" @default.
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