Abstract: An aerosol-generating device is provided, including: a cavity configured to receive an aerosol-generating article including an aerosol-forming substrate; a heater configured to heat the aerosol-forming substrate received in the cavity; a power supply; a residue detector for sensing aerosol-forming substrate residue in the cavity or on the heater; and a controller configured to: control a supply of power from the power supply to the heater to heat the aerosol-forming substrate received in the cavity, receive signals from the residue detection means indicative of an amount of aerosol-forming substrate residue in the cavity or on the heater, and determine an indication of the amount of aerosol-forming substrate residue in the cavity or on the heater based on one or more signals received from the residue detection means. An aerosol-generating system and a residue detector device are also provided.

Abstract: An aerosol-generating system is provided, including an aerosol-generating article including an aerosol-forming substrate being a dielectric material and substantially solid; an aerosol-generating device including: a power supply, a heater, a cavity to receive the article, and a controller to control a supply of power to the heater to heat the substrate when the article is within the cavity; and first and second electrodes spaced apart from each other so that at least a portion of the substrate is received between them when the article is within the cavity, the first electrode, the portion of the substrate, and the second electrode form a capacitor when the article is within the cavity, the controller also to: measure a capacitance of the capacitor via the first and the second electrodes, supply power to the heater in a first power profile and in a second power profile, different from the first power profile.