| 摘要 |
PURPOSE:To enable a highly accurate exhalation analysis, by updating a time constant for compensating delay in response by a time constant which is calculated from an output characteristic of a gas densitometer with a switch between exhalation and inhalation to correct the output of the gas densitometer by a computation. CONSTITUTION:A tube 1 is connected to a mask 2 at one end thereof while being opened to outside air or the like. One end of a tube 3 is mounted on the tube 1 to sample gas flowing through the tube. The tube 3 is connected to a suction pump 6 through a gas densitometer 4 and a flow rate controller 5. An output of the gas densitometer 4 is inputted into a data processor 8 through an A/D converter 7. The data processed with the unit 8 is outputted to a D/A converter, a display unit 10 and a communicating device 11. Here, the unit 8 comprises a response time measuring section 12 which receives an output y(t) of the densitometer 4 to calculate a response time Tr of the gas concentration and an output correcting section 13 which outputs a value x(t) obtained by correcting the output y(t) through a computation using the response time Tr. This enables a proper compensation regardless of variations in the time constant for the delay in the response of the densitometer 4.
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