| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the production cost of devices for measuring the carbon dioxide concentration in exhaled breath to spread the devices for respiratory rehabilitation. Ž<P>SOLUTION: A method of measuring the carbon dioxide concentration in exhaled breath includes an ultrasonic transmitting device and receiving device instead of a carbon dioxide sensor, and measures the velocity of ultrasonic waves propagating through exhaled breath. The obtained data is separately converted to the carbon dioxide concentration using a respiratory quotient value obtained by calibrating carbon dioxide in exhaled breath. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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