This paper describes optical instrumentation devoted to
vibration analysis. Two strategies based on digital Fresnel holography are
presented. The first, called time-averaging consists in the numerical
reconstruction of the hologram after recording with an exposure time much
greater than the vibration period. Thus, the holograms are amplitude
modulated by a Bessel function. The last strategy, using a pulsed regime,
allows the reconstruction of the full movement of the vibration, even if it
exhibits very high amplitude. Experimental results presented in this paper
concern the study of the vibrations of a clarinet reed under free and forced
oscillation regimes.