Phase-resolved heterodyne holographic vibrometry with a strobe local oscillator Auteur(s): Verrier N., Gross M., Atlan Michael (Article) Publié: Optics Letters, vol. 38 p.377-379 (2013) Texte intégral en Openaccess : Ref HAL: hal-00756128_v2 Ref Arxiv: 1211.5428 DOI: 10.1364/OL.38.000377 WoS: 000314629600047 Ref. & Cit.: NASA ADS Exporter : BibTex | endNote 4 Citations Résumé: We report a demonstration of phase-resolved vibrometry, in which out-of-plane sinusoidal motion is assessed by heterodyne holography. In heterodyne holography, the beam in the reference channel is an optical local oscillator (LO). It is frequency-shifted with respect to the illumination beam to enable frequency conversion within the sensor bandwidth. The proposed scheme introduces a strobe LO, where the reference beam is frequency-shifted and modulated in amplitude, to alleviate the issue of phase retrieval. The strobe LO is both tuned around the first optical modulation side band at the vibration frequency, and modulated in amplitude to freeze selected mechanical vibration states sequentially. The phase map of the vibration can then be derived from the demodulation of successive vibration states. |