HIGH SPEED DISPLACEMENT/STRAIN DISTRIBUTION MEASUREMENT METHOD BY MOIRE METHOD AND MEASUREMENT DEVICE

摘要

PROBLEM TO BE SOLVED: To solve a problem that, though a scan moire method and a sampling moire method have many advantages in a displacement strain distribution measurement in a static state, it takes a time to obtain a high resolution image when a scanning type laser microscope is used in the case of performing a dynamic displacement strain distribution measurement, and alternately, in the measurement of plane deformation, it is necessary to rotate a sample stage or a main scan line of a microscope by 90°, and there is a problem that during that time the sample is affected by deformation, and hence, a secondary deformation strain distribution of a structural material cannot be measured promptly and correctly.;SOLUTION: The number of scan lines is reduced, and a moire image is acquired at a higher speed without lowering a measurement sensitivity of displacement and strain. Scan point intervals in two directions of x and y are appropriately arranged by using a crossed grating for a sample grating and separated into primary scan moire fringes from one moire fringe image acquired without rotating the sample, and a secondary displacement strain distribution of the structural material is promptly and correctly combined with a high speed moire method.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2017,JPO&INPIT