Vibration imagery of remote objects

Reinhard R. Ebert; Peter Lutzmann

doi:10.1117/12.452042

9 December 2002 Vibration imagery of remote objects

Reinhard R. Ebert, Peter Lutzmann

Proceedings Volume 4821, Free-Space Laser Communication and Laser Imaging II; (2002) https://doi.org/10.1117/12.452042
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Laser vibrometry based on coherent detection technique allows to measure vibration characteristics of objects, based on its high Doppler resolution. Point targets were measured up to 40 km under medium turbluence conditions. Specifically vibration imaging offers an extensive potential for short-range civil applications and for long-range target classification and identification. For short range applications (up to few meters distance) laser vibrometry is used for investigating and testing of all kind of mechanical structures with respect to their vibration characteristics. Laser-Doppler based acoustic-to-seismic detection of buried mines shows a potential of this attractive technique at short range, mostly based on λ = 632 nm (HeNe laser). At longer ranges, the wavelengths of λ = 10.6 μm (CO2 laser) and λ = 1.5 μm (erbium fiber laser) are of interest, because of laser safety and better beam propagation through the atmosphere. Examples of the vibrometry technique with and without spatial resolution capability are shown here.

Citation Download Citation

Reinhard R. Ebert and Peter Lutzmann "Vibration imagery of remote objects", Proc. SPIE 4821, Free-Space Laser Communication and Laser Imaging II, (9 December 2002); https://doi.org/10.1117/12.452042

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