Holographic vibrometry: Full field holographic vibrometry at ultimate limits

TL;DR

This paper discusses heterodyne holography as a highly sensitive, full-field technique for vibration analysis capable of detecting extremely low amplitude vibrations with high precision.

Contribution

It introduces the application of heterodyne holography for full-field vibration measurement at ultimate sensitivity limits, enabling detailed 2D vibration mapping.

Findings

Detects vibrations below 0.01 nm amplitude

Provides complete 2D amplitude and phase maps

Achieves shot noise limited sensitivity

Abstract

Heterodyne holography is an extremely versatile and powerful holographic technique that is able to fully control the amplitude, phase and frequency of both the illumination and holographic reference beams. Applied to vibration analysis, this technique is able to detect the signal of the carrier or the one of any vibration sideband. A complete analysis of the vibration signal can thus be made, and 2D map of the vibration amplitude and phase in all points of the surface of the vibrating object can be obtained. Since the sensitivity is limited by shot noise, extremely low vibration amplitude (\textless{} 0.01 nm) can be studied.