Abstract
The moiré topographic method is a powerful means for measuring the height of protrusion and the depth of depression of a three dimensional uneven object. But this method is limited in its application just as various other measuring methods. In this paper, the property of the moiré fringes is reexamined from a visual view point. As a result of this study, it is found that an effectively measurable region exists in the conventional relation between the fringe interspacing and the inclination of the object. It is also ascertained that this effectively measurable region can be enlarged by changing the amount of mismatch of the reference grid.
