Abstract
Respiratory tubes with the length of 35 mm and the diameter of 10, 15, and 20 mm were made and both the static() and dynamic() pressures were measured for steady flow rates ranging 1-12 l/sec. Regression analysis resulted successful fitting of and data with quadratic equations with correlation coefficients higher than 0.99. The measurement standards of the American Thoracic Society (ATS) were applied to data, which demonstrated the smallest tube diameter of 15 mm to satisfy the ATS standards. The maximum value of the velocity type transducer with the diameter of 15 mm was estimated to be 75 cm, implying approximately 7 times larger sensitivity than the widely used pneumotachometer. These results showed that the velocity type respiratory air flow transducer is a unique device accomplishing miniaturization with the sensitivity increased, thus would be of great advantage to develop portable devices.
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