title: Imaging velocities of a vibrating object by stroboscopic sideband holography.
abstract: We propose here to combine sideband holography with stroboscopic illumination synchronized with the vibration of an object. By sweeping the optical frequency of the reference beam such a way the holographic detection is tuned on the successive sideband harmonic ranks, we are able to image the instantaneous velocities of the object. Since the stroboscopic illumination is made with an electronic device, the method is compatible with fast (up to several MHz) vibration motions. The method is demonstrated with a vibrating clarinet reed excited sinusoidally at 2 kHz, and a stroboscopic illumination with cyclic ratio 0.15. Harmonic rank up to n = ± 100 are detected, and a movie of the instantaneous velocities is reported.
authors.affiliation: Laboratoire Kastler Brossel: UMR 8552 CNRS- ENS- UPMC, 24 rue Lhomond 75231 Paris 05, France.
authors.forename: F
authors.initials: F
authors.lastname: Verpillat
authors.forename: F
authors.initials: F
authors.lastname: Joud
authors.forename: M
authors.initials: M
authors.lastname: Atlan
authors.forename: M
authors.initials: M
authors.lastname: Gross
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D006696:Holography / Q000295:instrumentation*; D009038:Motion; D009991:Oscillometry / Q000295:instrumentation*; D012212:Rheology / Q000295:instrumentation*; D049489:Stroboscopy / Q000295:instrumentation*; D014732:Vibration