Time resolved profile measurements for ultra-fast vibrating objects

Abstract

A novel technique using projected fringe profilometry with pulsed illuminations for finding the absolute shape of an object, which is vibrating with high frequency, is proposed. The proposed method can accurately describe the observed 3D shape at a sequence of time. Even though the tested object vibrates up to 10K-Hz, the proposed method can accurately describe the observed 3D shape at a specific time. Depth accuracy better than one part in ten thousandths of the field of view can be achieved even with excessive image noises. Furthermore, using the proposed method, the vibrating frequency and local displacement at each pixel can be accurately identified.