Measurement of Phase Equilibrium at High-Pressure Using Reflected Light

In this article, the phase equilibrium measurement based on the synthetic method under high pressure using reflected light is presented. The vapor phase separation point was determined by measuring the displacement of the piston with a laser displacement meter using the rapid volume change caused by the vapor phase generation. The liquid phase separation point was determined by measuring the reflected light intensity with a light sensor using the light scattering caused by the liquid phase generation. This method was successful in reducing human error.