Temperature determination

An apparatus for determining a temperature of a susceptor of an aerosol generating device, the susceptor being for inductive heating by a RLC resonance circuit, the apparatus comprising a controller,

• wherein at one or more of:
• substantially on start-up of the aerosol generating device, substantially on installation of a new or replacement susceptor into the aerosol generating device, or substantially on installation of a new or replacement inductor into the aerosol generating device, the controller is configured to:
• determine a frequency characteristic of a peak of a frequency response of the RLC resonance circuit at a reference temperature;
• and
• store the frequency characteristic as a stored reference characteristic, and
• wherein, at a later stage when the susceptor is being inductively heated, the controller is arranged to:
• determine the frequency characteristic again,
• determine the temperature of the susceptor based on a comparison of the frequency characteristic to the stored reference characteristic;
• and
• wherein the controller is further configured to control the heating of the aerosol generating material by the RLC resonance circuit based on the determined temperature of the susceptor;
• wherein the RLC resonance circuit is contained within a hand-held body of the aerosol generating device;
• and
• wherein the frequency characteristic is a resonant frequency of the RLC resonance circuit, and/or the frequency characteristic is, or is indicative of, a bandwidth of the peak of the frequency response of the RLC circuit, wherein the controller determines the temperature of the susceptor.