On the Influence of Relative Humidity on Piezoelectric Signals
湿度对骨内压电信号的影响

The piezoelectric effect of bone is related to relative humidity levels. Under trapezoidal pulse loading, piezoelectric signals of dry bone samples three-point bending were measured at different relative humidity levels. Piezo-voltages were obtained by using an ultra high input impedance bioamplifier. For the sake of comparing, piezo-charges of bone were also measured. Results show that piezo-voltage of bone quickly decreases with humidity increasing. Piezo-voltage decreases around 80% along with the relative humidity increases from 30% to 60%. The measured piezo-charge also decreases at lower rate along with humidity increasing due to different test principle. It is concluded that piezo-voltage induced by deformation of bone may be performed in a pulse style under dynamic loads.