| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for measuring the absolute value of a deformation quantity using speckles capable of determining the deformation quantity and deformation direction at the same time in regard to each deformation in material testing or a usage environment of a common structure. SOLUTION: Laser beams 21 passing through two or more different optical paths are cast on the surface of an object 11, the images of speckle patterns before and after deformation of the object 11 are respectively picked up, speckle interference fringes are formed by using the speckle patterns before and after deformation, a phase difference of the speckle interference fringes is determined and the deformation quantity of the object 11 is determined. The absolute value of the deformation quantity of the object 11 is measured by comparing the speckle patterns before and after deformation, determining respective movement of the speckles included in each speckle pattern, and determining the deformation direction of the object 11.
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