photovoltaic interpolator for anzeigeabweichungen on calibrated scales

摘要

An arrangement is disclosed for providing interpolation between readouts of displacements of a divided scale with respect to a reference location in a reading system which includes photosensing and counting of magnified images of scale graduations relatively moving with respect to the reference location. This arrangement accomplishes interpolation between counts of successive graduations by means for projecting an image of a series of scale graduations onto a series of photosensors which have a vernier spacing relationship with the series image so that the particular photosensor in the series registering with a graduation image provides an indication of the fractional displacements of the scale relative to the reference location.