Abstract
Interferometry is an effective method for the in-situ measurement of the faint-growth/dissolution rate of a crystal in a solution, in which the distortion of the observation cell due to the thermal expansion of the materials is sometime larger than the growth/dissolution of the crystal. Thus, it is necessary to establish the way to obtain the real growth/dissolution length by subtracting the displacement due to the distortion from the actual interferometric data. To estimate the behavior of the cell during heating, we observed the interference fringes from two glass windows simultaneously by employing a Michelson interferometry. The distortion of the cell was successfully separated into the expansion of volume of a solution and that of the cell holder. This analysis would also contribute to design the growth cell for the measurement of a very small growth rate of crystals in space.
