Identifying a dot-matrix hologram with the fringe-overlapping phenomena of grating dots

Identifying a dot-matrix hologram by che

Identifying a dot-matrix hologram by checking the intersecting angles of its gratings

✍ Sheng Lih Yeh; Shyh Tsong Lin 📂 Article 📅 2010 🏛 Elsevier Science 🌐 English ⚖ 622 KB

Three features about the intersecting state of two gratings are used to identify dot-matrix holograms created by two-beam writers in this paper. The first feature is the intersection angle of the fringes of two gratings. The second feature is the ratio of the pitches of two lowest-order moiré-patter