Abstract
This paper presents a sensor system for measuring flexibility of a living body, and the measurement principle is based on a change in a resonance frequency of a vibrating system with and without contacting the living body. The sensor system is made up of connecting two piezoelectric actuators in a series, one is used as a vibrator and the other is a displacement sensor used for measuring the change in the resonance frequency. The sensor is also modeled by using an equivalent mechanical system without contacting the living body. Moreover, useful characteristics of the proposal system are confirmed by measuring flexibility of three test samples of gelatin. The result shows that the present sensor system can clearly distinguish different flexibility of the three gelatin samples.
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