In Figure 1 also the measurement and actuation devices are shown, respectively. Basically, three types of measurement devices are used.
There is an acceleration sensor (Brüel & Kjaer 4383, piezoelectric charge accelerator, http://www.bkhome.com/), a force link (Kistler 9173B, SlimLine Quarz Force Link, http://www.kistler.com/), connecting shaker and structure, as well as two piezo electric strain type probes (SMART MATERIAL MFC M2814 P2, http://www.smart-material.com/).