Abstract

Laser-diode (LD) interferometry based on phase-shifting techniques has been applied to holographic interferometry for measuring the vibration amplitude and phase. First the developments including a phase-shifting interferometer with a frequency-modulated LD are reviewed. Second, stroboscopic holographic interferometry by a pulse-driven laser diode gives the measurement of the vibrating amplitude at any epoch. The frequency chirp of the laser-diode pulse used for real-time stroboscopic illumination cancels the Doppler frequency shift due to the motion of a sinusoidal vibrating object.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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