Abstract
This study performed to measure the vibration mode of thin CFRP plate by time averaged pulse stroboscopic digital holographic interferometry. In order to confirm the amount of amplitude of the vibration, the laser doppler velocimeter (LDV) and a time-averaged digital holographic interference device with a light chopping device are produced. The light chopping device can make pulse stroboscopic light and it can vary the duty ratio of the light intensity. This device produce time averaged pulse stroboscopic digital holographic interferometry. LDV and holographic interferometry method measurement measured an amplitude amount of a cantilever plate vibration. The measurement results indicate the same value by each method. The time averaged pulse stroboscopic digital holographic interferometry can visualize vibration amplitude of the plate quantitatively. At the duty ratio is 50%, the measurement amount becomes maximum or minimum amplitude, at due to phase angle difference between the light and the vibration. This method can visualize the vibration mode of thin CFRP plates.
