A detector system may include a sensing element including a substrate, sensing electrodes supported by the substrate, sensing material over the sensing electrodes, and a multi-energy-delivering element. The multi-energy-delivering element may be coupled to the sensing material and may deliver different types of energy to the gas sensing material. The detector system may include excitation and detection circuitry coupled to the sensing electrodes and the multi-energy-delivering element, and a controller coupled to the excitation and detection circuitry. The controller may cause the excitation and detection circuitry to achieve multi-gas differentiation with one-, two-, or higher-dimensional detection by applying an alternating current through the sensing electrodes at one or more operational frequencies for excitation of the sensing material, and applying at least one type of operational energy to the gas sensing material via the multi-energy-delivering element, wherein at least one type of operational energy has at least two levels.

Disclosed herein is a gas sensor that includes a gas sensor part including first and second thermistors connected in series, a temperature sensor part configured to generate a temperature detection signal, a variable resistor connected in parallel to the first thermistor, and a control circuit configured to change a resistance value of the variable resistor based on the temperature detection signal.