Compensation for air gap changes and temperature changes in a resonant phase detector

A method comprising, in a system comprising a plurality of sensors including a sensor configured to output a sensor signal indicative of a distance between the sensor and a mechanical member associated with the sensor and a measurement circuit communicatively coupled to the sensor and configured to determine a physical force interaction with the mechanical member based on the sensor signal:

• monitoring the sensor signal;
• applying a compensation factor to the sensor signal to compensate for changes to properties of the sensor based on at least one of:
• changes in a distance between the sensor and the mechanical member;
• and
• changes in a temperature associated with the sensor;
• during an initial calibration:
• determining a phase response of each sensor as a function of force applied to the mechanical member;
• and
• calculating a plurality of calibrated ratios of the phase responses between adjacent sensors of the plurality of sensors during the initial calibration;
• and
• during an operation:
• determining the phase response of each sensor as a function of force applied to the mechanical member;
• calculating a plurality of monitored ratios of the phase responses between adjacent sensors of the plurality of sensors during operation;
• and
• applying the compensation to one or more of the plurality of sensors based on differences between the monitored ratios and the calibrated ratios.