Oil recovery sensor

A method for measuring oil content of a fluid in a cavity, comprising:

• using a dielectric sensor, measuring the oil content of the fluid in the cavity;
• using one or more processors, determining that the oil content is below a threshold;
• and
• in response to the determination that the oil content is below the threshold, using an eddy current sensor to measure the oil content of the fluid.

A system for measuring oil content of a fluid, comprising:

• a dielectric sensor, comprising:
• a first resonance circuit formed by a first capacitor, a first inductor, and a sensor cavity through which the fluid can flow;
• and
• a first standing wave ratio (SWR) analyzer configured to measure a resonance frequency of the first resonance circuit;
• an eddy current sensor, comprising:
• a second resonance circuit formed by a second capacitor, and a second inductor, wherein the second inductor is configured to expose fluid within the sensor cavity to a magnetic field;
• and
• a second SWR analyzer configured to measure a height of a peak of a resonance frequency of the second resonance circuit;
• at least one processor;
• and
• at least one memory including computer program code;
• wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the system to:
• determine if the oil content is above or below a threshold;
• if the oil content is above the threshold, measure the oil content using the dielectric sensor;
• and
• if the oil content is below the threshold, measure the oil content using the eddy current sensor.