| 摘要 |
A method of determining and separating the alveolar air proportion of a person's breathing air and thereafter measuring a proportion of a desired gas component thereof, comprises, conveying the exhaled air at a minimum velocity through a conduit, continuously measuring the temperature of the conveyed air, and when the variation in temperature which is measured drops below a predetermined threshold value, directing the exhaled air into a measuring chamber using a sensor device in the measuring chamber to determine the proportion of the desired gas component. A device for this purpose, comprises, a breathing tube which has a passage therethrough for the passage of the breathing air and has a first direct passage terminating in a first outlet to ambience and a second branch passage which passes through a measuring chamber for alveolar air is connected downstream of the measuring chamber to ambience. The device further includes a temperature sensor for continuously sensing the temperature air passing through the passage and for regulating shutoff valves between the passage and the second branch into the measuring chamber in accordance with the temperature sensed so as to separate the alveolar air and direct it into the measuring chamber. In addition, the device includes shutoff valves at the outlets from the measuring chamber and the first branch to ambience which are regulated by the sensing of the temperature and the directing of the sensed value to a comparator which operates on an AND-gate and a timing switch for controlling the operation of the various valves.
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