Self-calibrated electrochemical gas sensor
A gas sensor, electrochemical technology, applied in the direction of electrochemical variables of materials, can solve problems such as inconvenience in practical application, and achieve the effect of being beneficial to modularization, simple structure, and improving stability and reliability
Active Publication Date: 2014-08-20
SUNVOU MEDICAL ELECTRONICS
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Problems solved by technology
[0006] Industrial Scientific published a patent (US6055840) in 2000, which describes a method for solving the gas concentration by quantitatively adjusting the resistance of the gas diffusion channel. This method needs to know the diffusion coefficient of the gas to be measured and the physics of at least one gas diffusion channel. size, so it is not convenient for practical application
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[0014] figure 1 It is a schematic diagram of the structure of the sensor of the present invention. The sensor is composed of a working electrode, a counter electrode, a reference electrode, an electrolyte, a gas chamber, etc., and the sensor includes at least two working electrodes, the first working electrode 11 and the second working electrode. Working electrode 12, a counter electrode 13 and a reference electrode 14, these electrodes are respectively deposited or printed on the surface of porous waterproof breathable membrane 21, 22; wherein the working electrode 11 communicates with the gas chamber 51 through the gas diffusion channel 41 (limiting hole) , the working electrode 12 communicates with the gas chamber 52 through the gas diffusion channel 42 (flow-limiting hole), and the gas in the gas chamber can diffuse to the electrode surface through the flow-limiting hole and the waterproof and breathable membrane; the gas chamber 51 communicates with the gas chamber 52 thro...
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The invention discloses a self-calibrated electrochemical gas sensor comprising working electrodes, a counter electrode, a reference electrode, electrolyte and gas chambers and the like, wherein the working electrodes, the counter electrode and the reference electrode are deposited or printed on the surface of a porous waterproof gas-permeable membrane; the sensor comprises at least two working electrodes, one counter electrode and one reference electrode; the working electrodes are respectively located in independent gas chambers; the gas in the gas chambers can be dispersed to the electrode surfaces through current-limiting holes and the waterproof gas-permeable membrane; the gas chambers are connected in series through gas channels; each gas chamber comprises a gas port to allow the gas to enter from the first gas chamber to the sensor and pass through the serially connected gas chambers to the last gas chamber, and leave the sensor.
Description
technical field [0001] The invention relates to a structural design and a calibration method of a gas sensor. Background technique [0002] The detection signals of commonly used electrochemical, metal oxide and carbon nanotube semiconductors, and catalytic combustion type chemical reaction gas sensors are proportional to the conversion or consumption rate of the measured gas mass. The gas to be measured reaches the surface of the gas sensor through processes such as gas flow transportation, mass transfer and dissolution. The relationship of sensor response signal to gas concentration thus includes all factors that affect these processes, including gas flow rate, pressure, temperature, humidity and other gas components. The sensitivity of the sensor is mainly affected by surface reaction factors during use, including aging, inactivation or poisoning of the reaction surface. However, changes in airflow status, humidity, temperature and pressure are usually more likely to ca...
Claims
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IPC IPC(8): G01N27/26G01N27/27
Inventor 谢雷韩杰韩益苹
Owner SUNVOU MEDICAL ELECTRONICS