Shearing interferometer using the grating as the beam splitter. Part 2.
In the previous paper, a Ronchi-type shearing interferometer was proposed, and the theoretical interpretation of the interferom­ eter and several experimental results were given. In this method, the distance between the grating and the observing plane (z = zp) is chosen so that a fourier image of the grating is formed in the observing plane and the distortion of the fourier image given by a phase object is detected by the moiré method. ' The optical ar­ rangement for this method is shown in Fig. 1. The purpose of