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CO2 concentration detection method with main-flow-type water vapor influence reduction

A carbon dioxide, mainstream technology with applications in biomedical engineering

Inactive Publication Date: 2016-01-13
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The innovative purpose of the present invention is to overcome the current mainstream carbon dioxide monitoring technology that is easily affected by water vapor in human exhaled gas, and provide an accurate monitoring method for human end-breathing carbon dioxide concentration

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  • CO2 concentration detection method with main-flow-type water vapor influence reduction
  • CO2 concentration detection method with main-flow-type water vapor influence reduction

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Embodiment Construction

[0014] 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.

[0015] 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, 1 represents a light source module, 2 represents a sensor module, 3 represents a transparent glass sheet, and 4 represents a gas channel. Wherein 3 and 4 constitute pipeline adapters, which can be directly installed on the human exhaled gas channel. The light source modules are separated on both sides of the pipe adapter. The sensor module has three channels, and a filter is installed at each channel port. The filter of the CO2 channel is 4.26 μm, the filter of the water vapor channel is 1.37 μm, and the filter of the ...

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Abstract

The invention discloses a CO2 concentration detection method with main-flow-type water vapor influence reduction, wherein a three-channel pyroelectric sensor is employed and includes a CO2 measurement channel, a reference channel and a water vapor measurement channel. The method comprises the following steps: determining peak values and valley values of all terminals according to data collected in the three channels; extracting voltage peak values of the water vapor measurement channel and the reference channel, calibrating a wave form formed by subtracting the two voltage peak values to obtain the voltage peak values corresponding to different water vapor concentrations; extracting the voltage peak values of the CO2 measurement channel and the reference channel, calibrating the wave form by subtracting the two voltage peak values to obtain the voltage peak values corresponding to different CO2 concentrations with the water vapor influence; obtaining a fitted curve of the voltage peak values corresponding to different CO2 concentrations without the water vapor influence; and performing real-time measurement. The method can increase measurement precision of CO2.

Description

technical field [0001] The invention belongs to the field of biomedical engineering and relates to a method for accurately monitoring the concentration of carbon dioxide at the end of human breathing. Background technique [0002] In clinical and other medical monitoring, the real-time monitoring of carbon dioxide concentration in human breathing has been paid more and more attention, especially the end-tidal carbon dioxide partial pressure has become the six basic vital signs. At present, the measurement of end-tidal carbon dioxide concentration monitoring system based on the principle of non-spectral infrared can be mainly divided into two types: mainstream monitoring of direct measurement and side-flow monitoring of measurement by extracting respiratory gas. [0003] The side-flow monitoring can dehumidify the extracted gas and stabilize the pressure to make the measurement accuracy higher, but due to the delay of the air extraction, the displayed waveform is obviously di...

Claims

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Application Information

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IPC IPC(8): G01N21/35
Inventor 杨嘉琛周建雄陈波波范大勇
Owner TIANJIN UNIV
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