Abstract
Cavities of irregular geometry can be modeled as Helmholtz resonators provided they adhere to specific dimensional limits. If the characteristics of the entrance region or “neck” of a cavity are held fixed, its resonant frequency will be a function only of its volume. This property of a Helmholtz resonator enables the determination of the volume of various cavities through resonant frequency measurements. Using an electronic feedback technique and hand-held adaptor, this methodology has been applied to determine the volumes of both simple and complex cavities including castings of human nasal passages. The aim of this research is the development of a laboratory system of measurement of nasal passage volume in live humans. This will allow the determination of volume changes resulting from various stimuli and provide further insight into the heat and mass transport phenomena that occur in upper respiratory airways.
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