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Proceedings Paper

Angular line scanning deflectometry using a laser pico projector
Author(s): Hao-Xun Zhan; Chao-Wen Liang; Shih-Che Chien
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Paper Abstract

In our previous publications, we had successfully made a deflectometry measurement by using a portable laser projector. In this research, we propose the beam weighting centroid method rather than previous the phase shifting method for quantification of the angular direction of the testing beam in the tested optics entrance pupil. By projecting the angular sequential lines on tested optics entrance pupil, the wavefront aberration is reconstructed from two orthogonal directions measurements, in a similar way to the line scanning deflectometry. The limited gray scale problem of laser projector during the phase shifting measurement is therefore eliminated. The reconstructed wavefront is proven to yield a more accurate result than the phase shifting methods at the cost of more image frames and acquisition time.

Paper Details

Date Published: 28 August 2016
PDF: 13 pages
Proc. SPIE 9960, Interferometry XVIII, 99600O (28 August 2016); doi: 10.1117/12.2236289
Show Author Affiliations
Hao-Xun Zhan, National Central Univ. (Taiwan)
Chao-Wen Liang, National Central Univ. (Taiwan)
Shih-Che Chien, National Chung-Shan Institute of Science and Technology (Taiwan)

Published in SPIE Proceedings Vol. 9960:
Interferometry XVIII
Katherine Creath; Jan Burke; Armando Albertazzi Gonçalves, Editor(s)

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