5 October 2011 Laser vibration sensing: overview and applications
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Abstract
Laser vibrometry based on coherent detection allows non-contact measurements of small-amplitude vibration characteristics of objects. This technique, commonly using the Doppler effect, offers much potential for short-range civil applications and for long-range applications in defence and security. Most commercially available laser vibrometers are for short ranges (up to a few tens of metres) and use a single beam from a low power HeNe laser source (λ = 632 nm). Long-range applications need higher laser output power, and thus appropriate vibrometers typically operate at 1.5 μm, 2 μm or 10.6 μm to meet the laser safety regulations. Spatially resolved vibrational information can be obtained from an object by using scanning laser vibrometers. To reduce measuring time and to measure transient object movements and mode structures of objects, several approaches to multibeam laser Doppler vibrometry have been developed, and some of them are already commercially available for short ranges. In this paper we focus on applications in the field of defence and security such as target classification and identification, including camouflaged or partly concealed targets, and the detection of buried land mines. Some examples of civil medium-range applications are given also.
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P. Lutzmann, P. Lutzmann, B. Göhler, B. Göhler, F. van Putten, F. van Putten, C. A. Hill, C. A. Hill, } "Laser vibration sensing: overview and applications", Proc. SPIE 8186, Electro-Optical Remote Sensing, Photonic Technologies, and Applications V, 818602 (5 October 2011); doi: 10.1117/12.903671; https://doi.org/10.1117/12.903671
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