Experiments on the Porch Swing Bearing of Michelson Interferometer for Low Resolution FTIR

Figure 4

Measurement setup for studying the fringe pattern of the output beam of the interferometer. The beam from Helium-Neon laser was collimated in C and then pointed through the Michelson interferometer built from plane mirrors M1 and M2 and a cube beam splitter BS. The mirror M2 was rigidly mounted, and the mirror M1 was moved using the porch swing bearing. The diverging lens L was used to enlarge the fringe pattern on the screen S which had a millimeter scale attached to it.