A Photoelectronic Device for Recording of Three-Dimensional Positional Changes and Its Application to Analysis of Human Motion

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A photo-electronic device for analysis of three-dimensional motion of human body without laborious frame by frame analysis of cine film records was constructed in the present study. The apparatus consisted of three photoelectronic units including cylindrical lenses and photoelectronic elements. Each unit gave electrical output signals corresponding to X-, Y- and Z-axis co-ordinates of the target position, respectively. Functional dependence of the output of the unit on the position was linear. The measuring system developed in this study enabled us to measure and record the displacements of human motion in any direction as well as velocity and acceleration components under both static and dynamic conditions.

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