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Proceedings Paper

Security holograms for automatic machine inspection
Author(s): Songcan Lai; Fuping Wang; Li Ding
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Paper Abstract

In this paper, a new kind of security hologram using an encoded reference wave is introduced. The hologram is produced with the interference of an encoded reference wave and a convergent object wave. The focus of the convergent wave can be reconstructed only by the illumination with a duplicate of the original encoded reference wave. Because the verification pattern is simply s spot peak rather than an image pattern, this kind of security hologram is suitable for machine inspection. A scheme of machine inspection by using this kind of security holograms is described.

Paper Details

Date Published: 23 September 1996
PDF: 2 pages
Proc. SPIE 2885, Holographic Optical Elements and Displays, (23 September 1996); doi: 10.1117/12.251853
Show Author Affiliations
Songcan Lai, Zhengzhou Institute of Technology (China)
Fuping Wang, Zhengzhou Institute of Technology (China)
Li Ding, Zhengzhou Institute of Technology (China)

Published in SPIE Proceedings Vol. 2885:
Holographic Optical Elements and Displays
Freddie Shing-Hong Lin; Daxiong Xu, Editor(s)

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