Holography

Identifying a dot-matrix hologram by the deviations of the fringe positions of its grating dots

[+] Author Affiliations
Sheng Lih Yeh

Lunghwa University of Science and Technology, Department of Mechanical Engineering, 300, Sec. 1, Wanshou Road, Kueishan, Taoyuan County, Taiwan

Opt. Eng. 45(7), 075803 (July 07, 2006). doi:10.1117/1.2221306
History: Received July 05, 2005; Revised December 18, 2005; Accepted January 03, 2006; Published July 07, 2006
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Dot-matrix holograms created by two-beam writers usually contain two-dimensional grating dots. Although the dot positions may be accurate, the fringe positions of the dots are randomly determined. The random fringe positions are good tools to identify a hologram. A grating position-deviation coefficient derived from the fringe position difference of two grating dots with the same pitch and the same orientation is defined and it is used as data to identify a dot-matrix hologram. Experiments have proved the proposed method practical and feasible. Because the fringe position difference between the two grating dots with the same pitch and the same orientation is difficult to reproduce, it is excellent for anticounterfeiting.

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© 2006 Society of Photo-Optical Instrumentation Engineers

Topics

Holograms ; Matrices

Citation

Sheng Lih Yeh
"Identifying a dot-matrix hologram by the deviations of the fringe positions of its grating dots", Opt. Eng. 45(7), 075803 (July 07, 2006). ; http://dx.doi.org/10.1117/1.2221306


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