Diffraction-Limit of Moire Contouring (2)

Abstract

The theory and experimental results of diffraction-limit of moire contouring using coherent light from a point source described in Part (1) are extended to the moire fringes using an imperfect light source.
It is undesirable to use an ideal source such as a laser in a practical equipment from the view point of handling and cost. And it is desirable that the source which is easy to handle and is of low cost, for instance, as an incandescent lamp is able to be use for the equipment.
The diffraction-limit of moire contouring using an imperfect source, which has some spatial and spectral extent, and an observing method of the moire fringes are presented in this paper.