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23 September 1996 Security holograms for automatic machine inspection
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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.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Songcan Lai, Fuping Wang, and Li Ding "Security holograms for automatic machine inspection", Proc. SPIE 2885, Holographic Optical Elements and Displays, (23 September 1996); https://doi.org/10.1117/12.251853
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