Identifying a dot-matrix hologram with the fringe-overlapping phenomena of grating dots |
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| Authors: | Sheng Lih Yeh Shyh Tsong Lin |
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| Institution: | 1. Department of Mechanical Engineering, Lunghwa University of Science and Technology, 300, Sec. 1, Wanshou Rd., Kueishan, Taoyuan County, Taiwan, R.O.C.;2. Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei, Taiwan, R.O.C.;1. College of Chemistry and Chemical Engineering, Yunnan Normal University, Kunming 650500, China;2. Hubei Key Laboratory for Catalysis and Material Science, College of Chemistry and Material Science, South Central University for Nationalities, Wuhan 430074, China;1. Materials Science and Nanotechnology Program, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;2. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand;3. National Metal and Materials Technology Center (MTEC), National Science and Technology Development of Agency, Thailand Science Park, Pathumthani 12120, Thailand;4. School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS), No. 72 Wenhua Road, Shenyang 110016, China;3. Sialon Unit, National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan;4. World Premier International (WPI) Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan |
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| Abstract: | Dot-matrix holograms created by two-beam writers contain many grating dots. Because the phase difference between two laser beams for interference cannot be controlled accurately, the fringe positions of grating dots are randomly determined. Therefore, fringe positions are a good kind of tool to identify dot-matrix holograms. In this paper, a number difference between two special fringes of a target grating dot is used to identify a dot-matrix hologram. The two special fringes are determined by three grating dots with parallel fringes. The first special fringe is corresponding to a fringe pair with the best matching for the fringes of the target grating dot and the fringes of the second grating dot. The second special fringe is corresponding to a fringe pair with the best matching for the fringes of the target grating dot and the fringes of the third grating dot. An experiment has proved the proposed method practical and feasible. Because reproducing a grating dot with a specified fringe number difference is difficult, the proposed method is excellent for anti-counterfeiting. |
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