Separation and Extraction of Fringe Patterns in Two-Dimensional Moire Interferometry by Fourier Transform
| Autor: | Taizo Shimada, Yoshiharu Morimoto |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Physics
Plane (geometry) business.industry Mechanical Engineering Astrophysics::Instrumentation and Methods for Astrophysics Phase (waves) Fourier spectrum Measure (mathematics) Displacement (vector) symbols.namesake Distribution (mathematics) Fourier transform Optics Mechanics of Materials symbols General Materials Science business Moire interferometry |
| Zdroj: | TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A. 59:541-546 |
| ISSN: | 1884-8338 0387-5008 |
| DOI: | 10.1299/kikaia.59.541 |
| Popis: | Moire interferometry can measure two-dimensional in -plane displacement distributions from x- and y- directional fringe patterns obtained by two sets of two beams. If the four beams are incident simultaneously, not only are the two-directional fringe patterns recorded on one image, but also other fringes are recorded simultaneously. In this paper, a method using Fourier transform is proposed in order to extract the necessary fringe pattern. An image of two-directional fringe pattinge with carriers obtained simultaneously by the four beams is recorded, and each directional first harmonic of the Fourier spectrum of the image is filtered for the purpose of selection. The phase distribution of the inverse Fourier transform of each directional first hamonic provides each directional displacement distribution. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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