フーリエ変換を用いた等色線と等傾線の分離法における誤差原因とその対策

抄録

In order to analyze direction of principal stress using photoelasticity, we have proposed a method which separates the isochromatics and the isoclinics from the fringe patterns obtained in the field of a plane polariscope. This method uses the extraction of frequency components of the Fourier transform of three-dimensional image processing. Theoretically, this method gives accurate results because of using a Fourier filter. Practically, however, the results obtained by this method are influenced by errors of experiments and analysis, and decrease accuracy.
In this paper, the effects of experimental noises and analytic errors on the results obtained by this method are discussed, and some methods to reduce them are proposed.