テレビ系を用いたスペックル干渉法
1979 年 8 巻 2 号 p. 91-94
詳細
1979 年 8 巻 2 号 p. 91-94
An apparatus is constructed which can measure small deformation of an object in quasi-real-time by speckle interferometry using a television system instead of photographic materials and simple experiments have been performed. The speckle pattern from an object before deformation is superposed with a diffused reference wave and the resultant pattern is taken by a television camera and stored in a scan converter. The difference of the stored pattern from the pattern after object deformation is made and it is squared and fed into a high-pass filter. The filtered pattern is displayed on a monitor television. Experiments have been performed for the cases of deformation both normal and parallel to the object surface and contour fringes of equal deformation have been obtained.
