Article,
Development Of Online Sensor For CO2 Measurement In Exhaled Air & Signature Analysis For Asthma & COPD — An Attempt
Int. J. on Recent Trends in Engineering and Technology,, 9 (1): 10 (July 2013)
Abstract
This method is used for the online measurement of
carbon dioxide in the exhaled air. The transit time for the
ultrasonic waves to travel from the transmitter to the receiver,
located at the two ends of the Kundt’s tube, is a function of the
density of the medium present in the tube. The variation in
the CO 2 concentration in various patients causes change in
the density of the medium, ultimately causing the change in
the transit time of ultrasonic waves in the tube. Thus, the
different transit times help in giving various concentrations
of carbon dioxide in exhaled air.
