Abstract
This paper describes how the vortex whistle can be used as a spirometer and what is the feature.
The vortex whistle with simple structure composed of only three elements has the function of whistle as well as that of a flowmeter. Once the dimensions of the elements are determined, the volumetric flow rate is uniquely obtained from the sound frequency via a linear function.
Thus the spirometer based on the vortex whistle shows interesting characteristics. These are: (1) it has the simple structure, (2) it requires no calibration once the structure is determined and (3) it provide the accurate quantitative flow rate as well as the sound from which the qualitative information can be acquired by the human auditory function.
Here we experimentally investigated what are the suitable sizes of whistle elemets to be used as a spirometer and showed the characteristics. The vortex whistle type spirometer shows satisfactory functions.
