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