Disclosed are systems and methods for analyzing an oil/gas separation process. One method includes conveying a fluid to a fluid separator coupled to a flow path, the fluid separator having an inlet and a discharge conduit, generating a first output signal corresponding to a characteristic of the fluid adjacent the inlet with a first optical computing device, generating a second output signal corresponding to the characteristic of the fluid adjacent the discharge conduit with a second optical computing device, receiving the first and second output signals with a signal processor communicably, and generating a resulting output signal with the signal processor indicative of how the characteristic of the fluid changed between the inlet and the discharge conduit.