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Proceedings Paper

Crack processing in a resin material using nano-pulsed second harmonic Nd:YAG laser for personal identification system
Author(s): Daisaku Tokita; Yoshio Ishii; Yuzuru Kubota; Kazuhiro Watanabe
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Paper Abstract

A new personal identification method has been investigated which promises to be a useful technique for protecting society against the recent increase in card counterfeiting crimes. Micro cracks that is created into transparent acrylic material using second harmonic Nd:YAG (wavelength: 532nm, pulse width: 8ns, pulse energy: 0.5mJ) are used for writing ID information. Identical person is identified by image matching of speckle pattern from created crack. In this study, identification is attempted for constructing the new personal identification method. Various ID patterns are created with changing shapes, the arrangement of spot. In result of crack observation by optical microscope, cracks are created around the spot and the shapes are different respectively. Speckle patterns are successfully identified by image template matching with normalized correlation coefficient. In a case of identification on template and target image obtained from same object, strong correlation was obtained. In this result, processed objects were identified by discerning speckle pattern. For these reason, the feasibility of new personal identification system using the laser processing and the speckle pattern is implied.

Paper Details

Date Published: 26 April 2007
PDF: 6 pages
Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 63462M (26 April 2007); doi: 10.1117/12.739096
Show Author Affiliations
Daisaku Tokita, Soka Univ. (Japan)
Yoshio Ishii, Soka Univ. (Japan)
Yuzuru Kubota, Soka Univ. (Japan)
Kazuhiro Watanabe, Soka Univ. (Japan)

Published in SPIE Proceedings Vol. 6346:
XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Dieter Schuöcker, Editor(s)

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