High-sensitive measurement of strain by moire interferometry.

Abstract

Moire interferometry is a useful method for measuring small displacement and strain distributions in the whole field of a specimen. However, it is difficult to make diffraction gratings and to measure small strain less than 10-3. In order to use the moire intrferometry easily, we try to mass-produce sheets of diffraction grating by hot-press printing. By transferring the grating of the sheet, we can easily make a diffraction grating on a specimen. For improving the sensitivity of moire interferometry, we apply a multiplication method to the moire intrferometry. As a result, we can measure strain of the order of 10-4.