Automatic Fringe Analysis of Moiré Interferometry
Yasuhiko Arai*, Tadao Kurata* and Shunsuke Yokozeki**
* Department of Mechanical Engineering, Faculty of Engineering, Kansai University, 3-3-35, Yamate-cho, Suita, Oosaka 564, Japan
** Department of Mechanical System Engineering, Faculty of Computer Science and System Engineering, Kyushu Institute of Technology, 680-4, Kawazu, lizuka, Fukuoka 820, Japan
The phase analysis of fringes by applying moiré techniques to the interferometer is well-known. Since this method is based on 2-D subtraction method in the incoherent optics, the distortion of the optical system is easily removed and a large aperture interferometer can be constructed. In this paper, a novel automatic method to detect phase of fringes was proposed by combining the conception of moiré-interferometer with a microcomputer system. The validity of the method is shown by experimental results in the phase analysis of fringes of slide-glasses. Furthermore, this system was applied to the measurement of pressure distributions in a Laval nozzle, and the measured results approximately coincided with the theoretical values. These results suggest that the system is well applicable to the fields of fluid mechanics.
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