Figure 3.

(a) Layout of the inkjet-printed accelerometer developed at the SensorLab@DIEEI of the University of Catania, Italy. Each strain gauge is about 12 mm long and 10 mm wide; the spacing and the track width are 300 µm, while the thickness of the conductive tracks is about 200 nm. The crab-leg beams have the following dimensions: a = 5 mm, b = 10 mm, L_a = 20 mm, and L_b = 15 mm for the thigh and the shin segments, respectively. The dashed lines represent the empty areas; (b) real view of the assembled final prototype of the developed inkjet-printed accelerometer; (c) frequency response of the device: experimental (black dots) and predicted (solid line); and (d,e) the calibration diagrams of the inkjet-printed accelerometer at 10 Hz and 35 Hz, respectively.