Absolute measurement of small-amplitude vibrations by time-averaged heterodyne holography with a dual local oscillator

Nicolas Verrier (1) , Michael Atlan (1)

1 IL - Institut Langevin - Ondes et Images (UMR7587)

We report a demonstration of the measurement of the ratio between an optical modulation side band component and the non-shifted light component by time-averaged heterodyne holography in off-axis and frequency-shifting configuration, through coherent frequency-division multiplexing with a dual optical local oscillator. Experimental results of sinusoidal vibration sensing are reported. This technique enables absolute measurements of sub-nanometric out-of-plane vibration amplitudes.

Mots clés: holography; laser doppler; coherent frequency-division multiplexing; vibrometry; heterodyne

Domaines: Optique [physics.optics]

Nicolas Verrier, Michael Atlan. Absolute measurement of small-amplitude vibrations by time-averaged heterodyne holography with a dual local oscillator. Optics Letters, 2013, 38 (5), pp.739. ⟨hal-00756069⟩