AbstractTwo perpendicular arrays of optical fibers are combined with a spherical lens and cylindrical lenses to form a 2‐dimensional‐velocity sensor. Each fiber array picks up spatial frequency components of the object pattern, and the center frequency of the narrowband output signal gives a velocity component of the object parallel to the optical fiber array. Therefore, velocity of the object is determined from center frequencies of the signals from the two fiber arrays. the equivalent filter including the imaging system is derived and its spatial frequency selectivity and accuracy of the measured velocity are clarified. the accuracy can be set to the desired value by properly adjusting the parameter values describing this system. the validity of the present system has been confirmed experimenta