RAMAN SPECTROSCOPIC SYSTEM FOR MEASURING COMPOSITION OF A MIXED PHASE FLUID

摘要

A Raman spectroscopic measurement system (100) for measuring the material composition of a mixed phase fluid (2) flowing in a process pipe (1) and having a gas phase dispersed in a liquid phase or vice versa includes an insert (3) to be inserted into the pipe. The insert includes a measurement chamber (5) partially defined by a phase separating membrane (7) that enables the gas phase to diffuse into and out of the measurement chamber and facilitates coalescing of the liquid phase which into a collector. The system further includes a collector (9) disposed adjacent the measurement chamber such that the coalesced liquid from outside the measurement chamber drains into the collector. The collector has a drain (11) in fluid communication with the pipe for returning the drained liquid to the pipe. A first probe (15) of the system is configured to transmit excitation light into the measurement chamber and to receive a Raman signal emanating from the gas phase therein, and a second probe (17) of the system is configured to transmit excitation light into the drain and to receive a Raman signal emanating from the liquid phase therein. The measurement system further includes a spectrometer (31) to determine the material composition of the fluid from the Raman signals.