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This paper describes a laser three‐focus velocimeter for measurement of particle size and velocity to make the system compact and portable. An array of independently driven laser diodes is used to obtain the stable output of the laser beams without the thermal interference between the laser diodes and to exclude ambiguity of velocity direction. The method measuring velocity and size of a transparent and spherical particle is shown. The optical characteristics are analyzed. Using a flow of glass beads, it is confirmed that this velocimeter is a useful tool for measuring particle size and velocity simultaneously.