METHOD FOR MONITORING THE FILL LEVEL OF AN INHALER RESERVOIR
This paper proposes an optical method for monitoring the fill level of an inhaler reservoir, based on the phenomenon of total internal reflection within a light guide. A detector design has been developed that enables the detection of the presence of working fluid (glycerine, propylene glycol, or their mixture) in various orientations of the inhaler. A theoretical analysis of the operational boundary conditions has been conducted, including calculations of light losses in the light guide depending on its material and surrounding medium.