Calibration of combined acceleration and pressure sensors

A method, comprising:

• detecting first and second voltages resulting respectively from first and second piezoelectric sensors being subject to an acceleration;
• comparing the first voltage and the second voltage;
• based on the comparing, determining an adjustment for a voltage divider coupled to one of the first and second piezoelectric sensors such that the voltage divider causes voltages produced respectively by the first and second piezoelectric sensors to match when the first and second piezoelectric sensors are subjected to the acceleration, wherein the adjustment for the voltage divider modifies a resistance of a variable resistor included in the voltage divide, wherein the first piezoelectric sensor is coupled across the variable resistor and an in-series resistor included in the voltage divider;
• and
• detecting a third voltage produced by a first differential amplifier coupled to the variable resistor and the in-series resistor.

A method, comprising:

• subjecting first and second piezoelectric materials in a hydrophone to an acceleration without subjecting the first and second piezoelectric materials to a pressure, wherein the subjecting to the acceleration causes the first and second piezoelectric materials to produce a voltage signal representative of pressure;
• and
• adjusting a sensitivity to acceleration of at least one of the first and second piezoelectric materials such that the voltage signal representative of pressure is reduced, wherein the adjusting of the sensitivity to acceleration includes determining a resistance for a variable resistor in a voltage divider network such that the voltage divider network matches a sensitivity to acceleration of the first piezoelectric material with a sensitivity to acceleration of the second piezoelectric material;
• wherein the first piezoelectric material is coupled across the variable resistor and an in-series resistor included in the voltage divider network;
• and
• wherein a first differential amplifier is coupled to outputs of the variable resistor and the in-series resistor.