Abstract
The objective of this paper is to understand the characteristics of the phenomena in piezo devices in a better manner, and to demonstrate a novel application for triage. That is, we focus not only the piezo effect, but also the pyroelectric effect of devices, which may expand the possibility of their application fields. To accomplish this, instead of the conventional equivalent electric circuit, we use a lumped-mass mathematical model of the device based on electrostatics and mechanics using a block diagram and transfer functions. The proposed model shows that the piezo device has internal feedback, indicating that it can function as a multiple-input/multiple-output sensor and/or actuator with reversible characteristics. These characteristics allow us to apply piezo devices to triage to detect the vital signs of heartbeat and respiration when the device is set inside a mask. We developed a simple and robust low-power, mask-type triage sensor that visualizes the respiration and heartbeat.
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