歩行中の歩幅の測定

Abstract

This paper describes a measurement of stride during gait. A measurement equipment is made with CMOS IC, and it's weight is about 650g. This equipment has a timing pulse generator, two ultrasonic transmitter driver, two received ultrasonic signal reformer, one 8-bit counter and one 8-bit foot switches circuit. The collected data both in a 8-bit counter and a 8-bit foot switches circuit are translated alternately to form sereal signals and are transmitted by a transfer circuit in this equipment. A formed sereal signals are transported through a plastic photo fiber about 30m long to a desk top type microcomputer to calculate the distance between an ultrasonic transmitter and a receiver. The ultrasonic transmitters are set into the left and right toe of a shoes and the ultrasonic receivers are set into the heel. A subject wear a pair of this shoes during walking. All of the lost data are interpolated by a spline function. These calculated distance values are added together a length of the shoes to get stride, and are drew a graph of the stride and velocity during-gait.