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Proceedings Paper

Automatic collimation system by Talbot interferometry
Author(s): Shinya Haramaki; Shunsuke Yokozeki; Akihiro Hayashi; Hiroshi Suzuki
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Paper Abstract

This study concerns the automatic high precision beam collimation system using the Talbot interferometry. When the collimation beam is obtained placed point-source of light in focal position of the collimation lens, the defocus value is calculated from a moire fringe width in the Talbot interferometry using only two grating. With the advance of collimation, the moire fringe cannot be confirmed. Using the movement of moire fringe when one of grating shifts, the expanded moire fringe width is measured high precisely from the phase difference of intensity change of two detecting points, using peak position of the cross-correlation coefficient. With the result of the defocus value, the collimator lens is positioned by motor controller.

Paper Details

Date Published: 8 May 2001
PDF: 4 pages
Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.427092
Show Author Affiliations
Shinya Haramaki, Ariake National College of Technology (Japan)
Shunsuke Yokozeki, Kyushu Institute of Technology (Japan)
Akihiro Hayashi, Kyushu Institute of Technology (Japan)
Hiroshi Suzuki, Kyushu Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 4416:
Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)
Koichi Iwata, Editor(s)

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