In this paper, temperature and ingredient of the living body model are estimated by means of the multifunctional sensing method using the piezo-electric ceramics. In this method, propagation time is measured using a pair of piezo-electric ceramics, and conductance is also measured using the electrode of the surface of the piezo-electric ceramics. As the experiment, propagation time and conductance of the living body model are measured by a pair of piezo-electric ceramics as temperature of 20°C, 25°C and 30°C. 3 types of samples which NaCl concentrations are respectively 0.1, 0.2 and 0.3 are prepared as the living body model. As a result, temperature and NaCl concentration of the model were estimated by measured values. Moreover, 3 types of samples which were different in viscosity were prepared, and temperature and viscosity were estimated by measuring the propagation time and conductance. Viscosity was changed by the concentration of TX151 which was an ingredient of the model. Therefore, the possibility of determination of temperature and the concentration of NaCl or TX151 which was the ingredient of the living body model was shown by using the proposed method.
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