ビーム整形によるレーザ超音波安定励起法の鋼材結晶粒径測定への適用
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概要
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A laser ultrasound generation method using beam equalizer has been developed. A light equalization device in beam condensing unit equalizes beam profile in focused area, even if beam profile of incoming pulsed laser light became worse and not uniform. This device was applied to a non-contact sensing system of crystal grain size of metals. By applying this device, this system can be used stably for a long period. The experimental result shows good correlation between measured Ferrite grain sizes by this system and by the microscope observation. In addition, the measured Ferrite grain size showed good correlation with the tensile test results.