Sensing system and method

A method comprising:

• repeatedly applying, by a controller, at least two different operational voltages to a heater of a sensor system;
• continuously applying, by the controller, alternating current through sensing electrodes at one or more operational frequencies of the sensor system for excitation of sensing material of the sensor system;
• measuring gas responses of the sensing material, by the controller, under the excitation with the alternating current through the sensing electrodes at the one or more operational frequencies at a first operational voltage that is applied to the heater;
• measuring additional gas responses of the sensing material, by the controller, under the excitation with the alternating current through the sensing electrodes at the one or more operational frequencies at a second operational voltage that is applied to the heater;
• detecting gas, by the controller, based on repeatedly applying at least the two different operational voltages to the heater and continuously applying the alternating current through the sensing electrodes at the one or more operational frequencies for excitation of the sensing material;
• and
• achieving differentiation, by the controller, between multiple gases.

A sensing system comprising:

• a sensing element comprising a substrate, sensing electrodes supported by the substrate, sensing material over the sensing electrodes, and a heater supported by the substrate;
• an excitation and detection circuitry coupled to the sensing electrodes and the heater;
• and
• a controller coupled to the excitation and detection circuitry, wherein the controller is configured to cause the excitation and detection circuitry to achieve multi-gas differentiation with one-, two-, or higher-dimensional detection by
• repeatedly applying at least two different operational voltages to the heater, and applying an alternating current through the sensing electrodes at one or more operational frequencies for excitation of the sensing material.