Fig. 1. Commercial PVDF piezoelectric impact force sensor for electronic body armour.
Fig. 2. Particle size analysis spectra of the piezoelectric ceramic powders (S55, Sunny Tech. Co., Taiwan) after ball-milling for 24 h.
Fig. 3. Flow chart of fabrication process for flexible piezoelectric impact force sensor composed of 50 μm-thick piezoelectric composite film sandwiched Al/PET film.
Fig. 5. Testing apparatus using a rotating hammer fitted with a hemispherical impactor
Fig. 10. Repeatability measurements of the impact force sensor for the electronic mitt set to periodic 100 N impact force.
Fig. 4. (a) Schematic image of the impact force tester for measurement of output signal from the electronic mitt and (b) real images of the impact force tester system.
Fig. 6. (a) Schematic of cross-sectional structure of the flexible piezoelectric impact force sensor, (b) the printed piezoelectric composite film on Al/PET film (left) and the final product of flexible piezoelectric impact force sensor.
Fig. 7. Output voltage obtained from the flexible piezoelectric impact force sensor at various impact force.
Fig. 8. (a) Internal structure and (b) photograph of the fabricated electronic mitt.
Fig. 9. Output sensing signal of the fabricated electronic mitt depending on applied impact force.
Table 1. Piezoelectric and dielectric properties of the piezoelectric ceramic (S55, Sunny Tech. Co., Taiwan) sintered at 1,100℃.
Table 2. Summary of voltage signals from piezoelectric impact force sensor on EVA (ethylene-vinyl acetate) plate after impact force loading.
Table 3. Summary of impact sensing signal characteristics of the piezoelectric sensor embedded electronic mitts.
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