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

Abstract

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.

References in corpus (3)

• Off-axis digital hologram reconstruction: some practical considerations
• Imaging of a vibrating object by Sideband Digital Holography
• Video-rate laser Doppler vibrometry by heterodyne holography

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• Non-destructive testing of composite plates by holographic vibrometry
• Phase-sensitive narrowband heterodyne holography
• Video-rate computational heterodyne holography