Vibration measurement by temporal Fourier analyses of a digital hologram sequence

• DOI: 10.1364/ao.46.005719
• Publication Date: 2007-08-10T14:17:03Z
• Authors: Yu Fu; Giancarlo Pedrini; Wolfgang Osten
• Keywords: Digital holography; Discrete-time Fourier transform

A method for whole-field noncontact measurement of displacement, velocity, and acceleration a vibrating object based on image-plane digital holography is presented. series holograms are captured by use high-speed CCD camera. The result the reconstruction three-dimensional complex-valued matrix with noise. We apply Fourier analysis windowed in both spatial temporal domains to extract acceleration. instantaneous displacement obtained unwrapping filtered phase map, whereas velocity evaluated along time axis. combination analyses allows evaluation vibration, without ambiguity problem, smooth distribution each instant obtained. comparison measurements also