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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 just limited to measurements on single test points but can also be used for full field scanning of entire structures, such as vehicles, braking systems, etc. Such Scanning LDVs (SLDVs) have found many applications in the automotive industry. However, for full body modal analysis, the use of SLDVs has traditionally been restricted due to the fact that only the Out-of-Plane (OOP) component of the velocity vector could previously be measured, whereas tri-axial accelerometers provide OOP and In-Plane (IP) data simultaneously. This limitation has been overcome with full 3-dimensional scanning LDVs, since 2002. A 3-D SLDV consists of three independent SLDV measurement heads, each measuring the vibration of a scan point from a different direction. The working principle and mathematics behind are discussed later in this paper.