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Electrochemical gas sensor

A gas sensor, electrochemical technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of low humidity sensitivity, high cost, complex structure of breath analyzer, etc., to achieve low humidity sensitivity, reduce Instrument cost, the effect of solving the broken electrode

Pending Publication Date: 2022-05-27
SUNVOU MEDICAL ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This breath analyzer is not only complex and costly, but also at the expense of fast response, which is required in portable and real-time analysis applications
[0006] In order to overcome the shortcomings of traditional electrochemical gas sensors in breath detection, the present invention provides an electrochemical gas sensor with low sensitivity to gas humidity and fast response, without setting humidity regulator and gas container

Method used

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Examples

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specific Embodiment 1

[0038] This embodiment describes the case where the air flow direction in the sensor air chamber (7) is parallel to the diffuser port (8) (as shown in the appendix). Figure 5 ) to maximize the effective area of ​​the diffusion port (8). The diffuser port (8) of the sensor is a circle with a diameter of 2.4cm and an area of ​​4.5cm 2 , the cross-section of the inlet and outlet of the sensor air chamber (7) is a circle with a diameter of 0.5cm, the length of the sensor air chamber (7) is 8.5cm, the width of the sensor air chamber (7) is 2.5cm, and the height of the sensor air chamber (7) is 0.6cm. When the flow rate of the air inlet of the sensor gas chamber (7) is 10mL / s, the simulation effect from the gas diffusion (attached Image 6 ), the area utilization rate of the diffusion port (8) is over 80%, and the effective diffusion area of ​​the diffusion port (8) is greater than 3.6 cm 2 .

specific Embodiment 2

[0039] This embodiment describes the case where the airflow direction in the sensor air chamber (7) is perpendicular to the diffuser port (8) (as shown in the appendix). Figure 7 ) to maximize the effective area of ​​the diffusion port (8). The diffuser port (8) of the sensor is a circle with a diameter of 3 cm and an area of ​​7.1 cm 2 , the cross section of the inlet and outlet of the sensor air chamber (7) is a circle with a diameter of 1 cm, the length of the sensor air chamber (7) is 3.5 cm, the width of the sensor air chamber (7) is 3.5 cm, and the height of the sensor air chamber (7) is 0.8cm. When the flow rate of the air inlet of the sensor air chamber (7) is 10mL / s, the gas simulation results show that the area utilization rate of the diffusion port (8) is over 85%, and the effective diffusion area of ​​the diffusion port (8) is greater than 6.0cm 2 .

specific Embodiment 3

[0040] This example describes an electrochemical H 2 Sensor structure and performance. The sensor structure of this embodiment is as attached figure 1 As shown, the reference electrode (2) and the auxiliary electrode (3) can be arranged longitudinally, and its shape is preferably consistent with the shape of the sensing electrode (1), and its area is preferably not larger than the area of ​​the sensing electrode (1) . The structure of the sensor gas chamber ( 7 ) and the diffusion port ( 8 ) of this embodiment are the same as those of the specific embodiment 1. The shape of the sensing electrode (1), the reference electrode (2), and the auxiliary electrode (3) of the sensor are all rectangles, and their materials are all platinum / graphene. The reference electrode (2) and the auxiliary electrode (3) are respectively Membrane material (5) is arranged above and below the sensor housing (6), a diffusion port (8) and a signal connector (9) are arranged on the sensor housing (6)...

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Abstract

The invention provides an electrochemical gas sensor which is composed of a sensing electrode (1), a reference electrode (2), an auxiliary electrode (3), an electrolyte (4), a membrane material (5), a sensor shell (6) and a sensor gas chamber (7), a diffusion opening (8) and a signal connector (9) are arranged on the sensor shell (6), and the sensing electrode (1), the reference electrode (2), the auxiliary electrode (3) and the membrane material (5) are immersed in the electrolyte (4) and arranged in the sensor shell (6). The diffusion port (8) is arranged above the sensing electrode (1), and the sensor air chamber (7) is arranged above the diffusion port (8); the internal size of the sensor air chamber (7) is not smaller than the size of the diffusion opening (8); the effective diffusion area of the diffusion opening (8) is larger than 3 cm < 2 >. The electrochemical gas sensor provided by the invention is low in sensitivity to gas humidity, is slightly influenced by ambient atmospheric pressure, and is beneficial to saving the equipment cost and improving the reliability of the equipment.

Description

technical field [0001] The present invention relates to the field of electrochemical gas sensors. More specifically, it relates to the field of electrochemical gas sensors applied to breath detection. Background technique [0002] Human breath detection technology has the advantages of non-invasive and immediate, and plays an important role in disease diagnosis. At present, the detection of exhaled nitric oxide, hydrogen sulfide, carbon monoxide and hydrogen mostly adopts electrochemical gas sensing technology. The humidity of human exhaled breath is generally above 90% RH, while traditional electrochemical gas sensors are sensitive to gas humidity. Positive or negative transient currents, thus causing the test value to be high or low. [0003] Although a dehumidification filter can be used to dehumidify the exhaled breath, since the dehumidification effect of the filter material is affected by the ambient temperature and humidity, dehumidification may also cause changes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416G01N27/30
CPCG01N27/4162G01N27/30Y02A50/20
Inventor 郑李纯刘田利韩杰
Owner SUNVOU MEDICAL ELECTRONICS
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