Aerosol delivery device and method of operating the aerosol delivery device

An aerosol delivery device comprising:

• an aerosol generator for generating an aerosol in the aerosol delivery device, the aerosol generator comprising
• a membrane, and
• a vibrator, which is configured to vibrate a fluid and to aerosolise the fluid by the membrane,
• a fluid reservoir for receiving the fluid to be aerosolised, the fluid reservoir being arranged in fluid communication with the membrane,
• a controller which is configured to sequentially operate the vibrator at a plurality of different vibration frequencies,
• a sensor which is configured to detect at least one electrical parameter of the vibrator for each of the plurality of different vibration frequencies, and
• a detector which is configured to detect the presence of the fluid in contact with the membrane on the basis of the dependence of the detected values of the at least one electrical parameter on the vibration frequency, wherein the detector is configured to detect the presence of the fluid in contact with the membrane on the basis of a slope or slopes of a curve of the detected values of the at least one electrical parameter as a function of the vibration frequency and on the basis of a length of the curve, wherein the at least one electrical parameter is a voltage and/or a current and/or a power and/or a current/voltage phase shift.