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A system includes a resonant sensor in contact with oil within a gearbox of a rotor system, such as a wind turbine, and one or more processors. The sensor includes electrodes and a sensing circuit that generates electrical stimuli having frequencies applied to the oil at different times during a lif

A system includes a resonant sensor in contact with oil within a gearbox of a rotor system, such as a wind turbine, and one or more processors. The sensor includes electrodes and a sensing circuit that generates electrical stimuli having frequencies applied to the oil at different times during a life of the gearbox. The processors receive electrical signals from the resonant sensor representative of impedance responses of the oil to the electrical stimuli. The processors analyze the impedance responses and determine a concentration of a polar analyte in the oil at different times. The processors calculate a degradation value for the gearbox based on the concentration of the polar analyte. Responsive to the degradation value exceeding a designated threshold, the processors at least one of schedule maintenance for the rotor system, provide an alert to schedule maintenance, or prohibit operation of the rotor system until maintenance is performed.

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1. A system comprising: a resonant sensor configured to be in contact with oil within a gearbox of a rotor system, the sensor including electrodes and a sensing region circuit that is configured to generate electrical stimuli at different times during an operational life of the gearbox, each electri

1. A system comprising: a resonant sensor configured to be in contact with oil within a gearbox of a rotor system, the sensor including electrodes and a sensing region circuit that is configured to generate electrical stimuli at different times during an operational life of the gearbox, each electrical stimulus having multiple different frequencies that are applied to the oil via the electrodes; andone or more processors configured to receive multiple electrical signals from the resonant sensor, the electrical signals representative of impedance responses of the oil to the electrical stimuli, the one or more processors configured to analyze the impedance responses and determine a concentration of a polar analyte in the oil at each of the different times based on the impedance responses, the one or more processors further configured to calculate a degradation value for the gearbox based on the concentration of the polar analyte in the oil,wherein, responsive to the degradation value exceeding a designated degradation threshold, the one or more processors are configured to at least one of schedule maintenance for the rotor system, provide an alert to schedule maintenance for the rotor system, or prohibit operation of the rotor system until maintenance is performed on the rotor system;wherein the one or more processors are configured to calculate the degradation value as an integral of the concentration of the polar analyte in the oil over a time period in which the electrical stimuli are applied to the oil; andwherein determining the concentration of the polar analyte includes individually measuring a concentration of at least one contaminant in the oil and individually measuring a level of aging of the oil. 2. The system of claim 1, wherein the resonant sensor is a multivariable sensor. 3. The system of claim 1, wherein the resonant sensor individually quantifies a concentration of at least one contaminant in the oil and a level of aging of the oil. 4. The system of claim 1, wherein the resonant sensor individually quantifies a concentration of molecularly dissolved water and a concentration of dispersed water in the oil. 5. The system of claim 1, wherein the polar analyte in the oil is at least one of an acidic component or water. 6. The system of claim 1, wherein the polar analyte in the oil is water, the system further comprising a temperature sensor configured to monitor a temperature within the gearbox, the one or more processors configured to calculate the degradation value for the gearbox based on the concentration of water in the oil during time periods that the temperature within the gearbox is less than an evaporation threshold temperature. 7. The system of claim 1, wherein the polar analyte in the oil is water, the system further comprising a vibration sensor mounted to the rotor system, the vibration sensor configured to detect that the rotor system is in a non-operating state based on an amount of vibration of the rotor system, the one or more processors configured to calculate the degradation value for the gearbox based on the concentration of water in the oil during time periods that the rotor system is in the non-operating state. 8. The system of claim 1, wherein the resonant sensor is configured to generate the electrical stimuli periodically at intervals no greater than five minutes in duration in order for the one or more processors to periodically determine the concentration of the polar analyte in the oil during the operational life of the gearbox. 9. The system of claim 1, wherein the one or more processors are further configured to estimate a remaining amount of time in the operational life of the gearbox based on the degradation value for the gearbox, the remaining amount of time inversely proportional to the degradation value. 10. The system of claim 1, wherein the one or more processors are configured to analyze the impedance response by extracting resonance parameters of the impedance response, the resonance parameters including one or more of a frequency position (Fp) and magnitude (Zp) of a real part of the impedance response, a resonant frequency (F1) and antiresonant frequency (F2) of an imaginary part of the impedance response, an impedance magnitude (Z1) at the resonant frequency (F1) and an impedance magnitude (Z2) at the antiresonant frequency (F2), and a zero-reactance frequency (Fz) at the imaginary part of the impedance response. 11. The system of claim 1, wherein the sensing region circuit of the resonant sensor includes at least one inductor-capacitor-resistor (LCR) resonant circuit. 12. The system of claim 1, further comprising the rotor system, wherein the rotor system is a wind turbine. 13. A method comprising: obtaining multiple measurements of a concentration of at least one polar analyte in oil within a gearbox of a rotor system, the measurements obtained at different times during an operational life of the gearbox via a resonant sensor in operational contact with the oil, the resonant sensor including electrodes and a sensing region circuit that is configured to generate an electrical stimulus having multiple different frequencies that are applied to the oil via the electrodes, the concentration of the at least one polar analyte in the oil determined based on an impedance response of the oil to the electrical stimulus;calculating a degradation value for the gearbox based on the concentration of the at least one polar analyte in the oil within the gearbox;responsive to the degradation value exceeding a designated degradation threshold, at least one of scheduling maintenance for the rotor system, providing an alert to schedule maintenance for the rotor system, or prohibiting operation of the rotor system until maintenance is performed on the rotor system;wherein the degradation value is calculated as an integral of the concentration of the at least one polar analyte in the oil over a time period that the measurements of the concentration are obtained; andwherein obtaining multiple measurements of the concentration of the at least one polar analyte in oil includes individually measuring a concentration of at least one contaminant in the oil and individually measuring a level of aging of the oil. 14. The method of claim 13, wherein the measurements of the concentration of the at least one polar analyte in the oil are obtained periodically at intervals no greater than five minutes in duration. 15. The method of claim 13, further comprising detecting that the rotor system is in a non-operating state, wherein at least some of the measurements of the concentration of the polar analyte in oil are obtained while the rotor system is in the non-operating state. 16. The method of claim 13, wherein the designated degradation threshold is a first degradation threshold and responsive to the degradation value exceeding the first degradation threshold, the method includes at least one of scheduling replacement of the oil within the gearbox or providing an alert to schedule replacement of the oil within the gearbox, and wherein, responsive to the degradation value exceeding a second degradation threshold that is greater than the first degradation threshold, the method includes at least one of scheduling servicing of the gearbox or providing an alert to schedule servicing of the gearbox. 17. The method of claim 13, further comprising estimating a remaining amount of time in the operational life of the gearbox based on the degradation value for the gearbox, the remaining amount of time inversely proportional to the degradation value. 18. The method of claim 13, wherein the at least one polar analyte that is measured is water and the method further comprises monitoring a temperature of the oil within the gearbox, the degradation value for the gearbox calculated based on measurements of the concentration of water in the oil that are obtained during time periods that the temperature of the oil is less than an evaporation threshold temperature. 19. The method of claim 13, further comprising analyzing the impedance response of the oil to the electrical stimulus to determine both a concentration of at least one contaminant in the oil and a concentration of an additive package in the oil based on the impedance response. 20. The method of claim 13, wherein obtaining multiple measurements of a concentration of at least one polar analyte in oil comprises obtaining multiple measurements of the concentration of at least two polar analytes. 21. A system comprising: a resonant sensor configured to be in contact with oil within a gearbox of a rotor system, the sensor including electrodes and a sensing region circuit that is configured to generate electrical stimuli at different times during an operational life of the gearbox, each electrical stimulus having multiple different frequencies that are applied to the oil via the electrodes;one or more processors configured to receive multiple electrical signals from the resonant sensor, the electrical signals representative of impedance responses of the oil to the electrical stimuli, the one or more processors configured to analyze the impedance responses and determine a concentration of water in the oil at each of the different times based on the impedance responses;an operating condition sensor mounted to the rotor system, the operating condition sensor configured to detect when the rotor system is in a non-operating state and when the rotor system is in an operating state,wherein the one or more processors are configured to calculate a degradation value for the gearbox based on the concentration of water in the oil during time periods that the rotor system is in the non-operating state, and, responsive to the degradation value exceeding a designated degradation threshold, the one or more processors are configured to at least one of schedule maintenance for the rotor system, provide an alert to schedule maintenance for the rotor system, or prohibit operation of the rotor system until maintenance is performed on the rotor system;wherein the one or more processors are configured to calculate the degradation value as an integral of the concentration of the polar analyte in the oil over a time period in which the electrical stimuli are applied to the oil; andwherein the resonant sensor individually quantifies a concentration of at least one contaminant in the oil and a concentration of an additive package in the oil based on the impedance response. 22. The system of claim 19, wherein the operating condition sensor is at least one of a vibration sensor, a temperature sensor, an electrical switch sensor, or an optical sensor.