The performance of interferometers is strongly affected by thermal drift and mechanical
vibrations. These induce fluctuations in the fringe positions and fringe densities
causing a fluctuating interference pattern with a reduced visibility. The amount of fluctuations
induced by these effects depends on the type of interferometer. Here we introduce a new class of interferometers, the double beam circular interferometers (DBCI),
which are extremely insensitive to the fluctuations described above.
"Stability of fringe patterns of different interferometers", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); doi: 10.1117/12.22211; https://doi.org/10.1117/12.22211