Gas type detecting method and system

Abstract

The invention discloses a gas type detecting method and system. The method comprises the following steps: enabling the multiwalled carbon nanotube integrated gas sensor to be connected in series with an amperemeter, a current-limiting resistor R1, and a sampling resistor R2 in sequence; under the action of a direct current high-voltage power supply, ionizing gas inside a cavity of the gas sensor; recording the voltage V between the electrodes of the sensor and the gas ionization current A of the sensor; analyzing detected data of the gas sensor by adopting a lyapunov index; judging the type of gas to be detected. The invention further discloses a preparation method for the multiwalled carbon nanotube integrated gas sensor. The gas type detecting method provided by the invention can realize the detection of different kinds of gas.

Description

technical field [0001] The invention relates to a gas type detection method and system, in particular to a gas type detection method and system using a carbon nanotube integrated gas sensor. Background technique [0002] At present, the gas sensors used to detect gas types on the market can be divided into electrochemical type, catalytic combustion type, thermal conductivity cell type, semiconductor type, infrared ray, etc. according to the principle. Each type of gas sensor has its own scope of application. At the same time There are their own limitations and defects. The electrochemical formula can be used to detect some flammable, toxic and electrochemically active gases. The redox reaction is used to distinguish the gas components. The detection needs to continuously consume the electrolyte inside the sensor, and the service life is short. ; The catalytic combustion type can detect flammable gases, and has a long service life, but the detection range is limited; the ther...

AI Technical Summary

Problems solved by technology

[0002] At present, the gas sensors used to detect gas types on the market can be divided into electrochemical type, catalytic combustion type, thermal conductivity cell type, semiconductor type, infrared ray, etc. according to the principle. Each type of gas sensor has its own scope of application. At the same time There are their own limitations and defects. The electrochemical formula can be used to detect some flammable, toxic and electrochemically active gases. The redox reaction is used to distinguish the gas components. The detection needs to continuously consume the electrolyte inside the sensor, and the service life is short. ; The catalytic combustion type can detect flammable gases, and has a long service life, but the detection range is limited; the thermal conductivity cell type uses the specific thermal conductivity of each gas to distinguish gas components, and has a narrow application range and many limiting factors; the semiconductor type It is manufactured by using some metal oxide semiconductor materials. At a certain temperature, the electrical conductivity changes with the change of ambient gas composition. This type of sensor is low in cost and has a wide range of applications, but its stability is poor and it is greatly affected by the environment.

Images