Development of the Ubiquitous Pulse Wave and Bloodstream Sensor

Abstract

We have proposed the fall detection method using pulse wave and bloodstream as a vital sign, acceleration and angular velocity. Pulse wave and bloodstream are used for distinguishing between a case in which persons fell and a case in which persons did not fall down due to keep their balance although the fall began. For this method, the ubiquitous pulse wave and bloodstream sensor that can measure pulse wave and bloodstream even during fall motion was developed successfully. This pulse wave and bloodstream sensor has the DC-AC separation amplifier and optical modulator. The sensor enables to solve a transient response problem and prevent disturbance by ambient light and measure a human pulse during motion. The fall detection experiments showed that the fall detection algorithm using the pulse wave and bloodstream was able to distinguish between a case in which persons fell and a case in which persons did not fall down due to keep their balance although the fall began.