Since engineering structures are often systems that are capable of vibration and the predominant part of all load factors has a dynamic character, the focus of corresponding monitoring measurements is set on the collection of temporally variable structural deformations.

Until now, the primary components of such measurement concepts are acceleration sensors, inductive displacement sensors and strain gauges. Although these sensors provide highly accurate data that is optimally adapted to the application, they must be mounted on the measurement object producing an enormous workload. Furthermore, inaccessible areas that do not allow the mounting of these sensors are particularly problematic. In general, the measurement information obtained in this way is only available at discrete object points and cannot be interpreted without appropriate prior knowledge about the supporting structure.