Abstract
To measure the deformation of the structural material, an irradiated grid or grating fabrication method has been developed. Using a laser projector, squire grid or parallel grating was irradiated to the specimen that has luminous paint on the surface. After ten minutes irradiation, a grid or grating can be observed of bright and dark parts. Bright parts were irradiated by laser beam and can be observed in 1 minute. 3-point bending test was performed after ten minutes irradiation of laser, and grid could be observed during 3-point bending test. Another method of the exposure of UV light (375nm) on to the specimen surface with a grid mask was also carried out.
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