CPC G01N 21/0317 (2013.01) [G01N 1/44 (2013.01); G01N 21/31 (2013.01); G01N 33/2823 (2013.01); G05D 23/22 (2013.01)] | 20 Claims |
1. A pressure cell for sum frequency generation spectroscopy, the pressure cell comprising:
a metal pressure chamber including:
a liquid sample holder that retains a liquid sample;
a removable lid that seals against a base to enclose the liquid sample holder in an interior of the metal pressure chamber;
a window in the removable lid that allows the liquid sample to be optically accessed from an exterior of the metal pressure chamber;
a sample inlet that flows the liquid sample from the exterior of the metal pressure chamber to the liquid sample holder in the interior of the metal pressure chamber at a predetermined flow rate; and
a sample outlet that flows the liquid sample from the liquid sample holder to the exterior of the metal pressure chamber;
a heating stage, disposed in the interior of the metal pressure chamber, that heats the liquid sample;
a chamber pump, connected to the interior of the metal pressure chamber, that pressurizes the interior of the metal pressure chamber;
a salinity control system comprising a membrane coupled to the sample inlet, wherein the membrane is configured to reduce a salinity level of the liquid sample; and
a controller that controls the chamber pump, the salinity control system, and the heating stage to control a pressure of the interior of the metal pressure chamber, the salinity level of the liquid sample, and a temperature of the liquid sample, respectively.
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