Abstract
In the first report we tried to apply fringe scanning technique to the grating projection system for shape analysis. But the previous system has a drawback in that the error of measurement increases in proportion to the period of a grating. This error proved to be caused by the intensity profile of a Ronchi grating in the projection optics. In order to improve this defect we propose to use a sinusoidal grating which is printed on a photographic film by modulating the beam from a laser diode. Use of this sinusoidal grating can eliminate errors caused by the Ronchi grating and enlarge the range of measurement with higher accuracy and sensitivity. And also three-dimensional coordinates are calculated absolutely with the origin in the measuring space.
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