| CPC A24F 40/50 (2020.01) [A24F 40/46 (2020.01); A24F 40/51 (2020.01)] | 17 Claims | 

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               1. An apparatus for generating aerosol from an aerosolisable medium, the apparatus comprising: 
            a housing; 
                a chamber for receiving an article, the article comprising: an aerosolisable medium; and 
                a marker arrangement comprising a first marker and a second marker spaced apart from each other by a predetermined distance; and 
                a sensor arrangement comprising a first sensor for sensing the first marker and a second sensor for sensing the second marker, wherein: 
              the first sensor has a first sense region in which the first sensor is able to sense the first marker; 
                  the second sensor has a second sense region in which the second sensor is able to sense the second marker; and 
                  wherein the first sensor and the second sensor are different types of sensors. 
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