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Laser Doppler Vibrometry (LDV) is an established tool in automotive engineering for non-contact vibration measurements. The LDV method is not limited to measurements on single test points. Complete structures can be tested by utilizing a pair of galvano-electrical mirrors for steering the laser beam in x and y directions across the surface. Such scanning LDVs (SLDV) have found many applications in the automotive industry. However for full body modal analysis use of scanning LDVs has so far been restricted due to the fact that only the out-of-plane (OOP) component of the velocity vector can be measured whereas tri-axial accelerometers provide OOP and in-plane data simultaneously. This limitation has been overcome with three-dimensional scanning LDVs which were first introduced towards the end of 2002. A 3D SLDV consists of three independent SLDV measurement heads, each measuring the vibration of a scan point from a different direction.