HIGH TEMPERATURE HIGH PRESSURE (HTHP) CELL IN SUM FREQUENCY GENERATION (SFG) SPECTROSCOPY FOR OIL/BRINE INTERFACE ANALYSIS WITH RESERVOIR CONDITIONS AND DYNAMIC COMPOSITIONS

A pressure cell for sum frequency generation spectroscopy includes: a metal pressure chamber; a heating stage that heats a liquid sample; an ultrasonic stage that emulsifies the liquid sample; a chamber pump that pressurizes an interior of the metal pressure chamber; and a controller that controls the chamber pump, the ultrasonic stage, and the heating stage to control a pressure of the interior of the metal pressure chamber, an emulsification of the liquid sample, and a temperature of the liquid sample, respectively. The metal pressure chamber includes: a liquid sample holder that retains the liquid sample; a removable lid that seals against a base; a window in the removable lid; a sample inlet that flows the liquid sample from an exterior of the metal pressure chamber to the liquid sample holder at a predetermined flow rate; and a sample outlet.