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Main stream type method for monitoring concentration of carbon dioxide breathed by people in real time

A carbon dioxide, real-time monitoring technology, applied in the field of biomedical engineering, can solve problems such as waveform drift and large measurement error, and achieve the effects of improving monitoring stability, avoiding drift, and improving output signal-to-noise ratio.

Inactive Publication Date: 2014-04-09
TIANJIN UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the problems of large measurement errors and easy waveform drift in the existing mainstream respiratory monitoring, and provide a method for quickly, stably and accurately monitoring the carbon dioxide concentration of human breathing

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  • Main stream type method for monitoring concentration of carbon dioxide breathed by people in real time
  • Main stream type method for monitoring concentration of carbon dioxide breathed by people in real time
  • Main stream type method for monitoring concentration of carbon dioxide breathed by people in real time

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Embodiment Construction

[0028] The carbon dioxide concentration monitoring method of the present invention is proposed for mainstream gas monitoring, and the composition of the monitoring system applicable to the present invention is given below.

[0029] The mainstream breathing carbon dioxide concentration monitoring system consists of a host computer and a monitoring module. The upper computer is a general-purpose computer or monitor. Monitoring modules such as figure 1 As shown, the infrared light source 9 and the pyroelectric sensor 4 are respectively placed on both sides of the adapter 1, the microcontroller sends a modulated light source signal through the light source drive circuit 8 and the infrared light source 9, and the dual-channel pyroelectric sensor placed at the other end of the pipeline The two channels of 4 respectively receive 4.26 μm infrared light absorbed by carbon dioxide molecules 2 and 3.95 μm infrared light not absorbed by any gas molecules 3 . The output of the sensor is ...

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Abstract

The invention belongs to the field of biomedical engineering, and relates to a main stream type method for monitoring the concentration of carbon dioxide breathed by people in real time. The main stream type method comprises the following steps: controlling a light source to be on and off, and outputting modulating signals with continuously changed amplitudes by a dual-channel pyroelectric sensor; filtering data collected by each channel; then extracting alternating current components by utilizing the sum and difference of peak valleys; determining the concentration of the carbon dioxide breathed at present according to fitting parameters d1 and d2 obtained during a calibration experiment. The main stream type method can quickly, stable and accurately monitor the concentration of carbon dioxide breathed by people.

Description

Technical field: [0001] The invention belongs to the field of biomedical engineering and relates to a mainstream real-time monitoring method for carbon dioxide concentration in human breath. Background technique: [0002] Real-time monitoring of human breath carbon dioxide concentration has played an increasingly important role in medical monitoring. The respiratory carbon dioxide concentration monitoring system based on the principle of non-spectral infrared can be divided into two types according to different measurement positions: mainstream monitoring of direct measurement and side-stream monitoring of measurement by extracting respiratory gas. Side-flow monitoring can accurately measure the concentration of respiratory gas due to the pretreatment of dehumidification and steady flow of the respiratory airflow, but the displayed waveform is obviously distorted due to the delay of extracting the airflow. At present, mainstream monitoring mostly uses thermopile sensors and...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504
Inventor 杨嘉琛王海涛陈波波
Owner TIANJIN UNIV
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