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Measuring system and method of gas response sensitivity in oxygen-free environment

A gas response and sensitivity technology, which is applied in the field of gas sensitivity measurement and calculation system, can solve the problems that cannot be separated from the test equipment, and achieve the effect of making up for the lack of response characteristics and improving the timeliness

Inactive Publication Date: 2015-01-21
DALIAN NATIONALITIES UNIVERSITY
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Problems solved by technology

[0002] At present, in the development process of gas sensors, it is necessary to study the gas response characteristics of the sensors in different environments and working conditions, measure the pros and cons of the sensors, and find out the best working conditions of the sensors. This is inseparable from good testing equipment.

Method used

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  • Measuring system and method of gas response sensitivity in oxygen-free environment
  • Measuring system and method of gas response sensitivity in oxygen-free environment
  • Measuring system and method of gas response sensitivity in oxygen-free environment

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Embodiment

[0051] A system for measuring and calculating gas response sensitivity in a non-oxygen environment, including: a non-oxygen environment, a gas chamber, a VOC gas sensor, a signal acquisition and transmission system, and a host computer;

[0052] The air chamber is a non-oxygen environment;

[0053] The signal acquisition and transmission system includes

[0054] A voltage divider circuit, the voltage divider circuit is a VOC gas sensor and a voltage divider resistor R L Composed in series, used to output the output voltage V in the air after the VOC sensor is desorbed air and the output voltage V in the measured gas when the VOC sensor is adsorbed gas ;

[0055] The A / D conversion module is connected with the voltage divider circuit, and is used to convert the V outputted by the voltage divider circuit air and V gas The voltage analog signal is converted into a voltage digital signal;

[0056] The microprocessor is connected with the A / D conversion module for A / D conversio...

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Abstract

The invention relates to a measuring system and a measuring method of the gas response sensitivity in an oxygen-free environment. The measuring system comprises the oxygen-free environment, a gas chamber, a VOC (Volatile Organic Compound) gas sensor, a signal acquisition and transmission system and an upper computer, wherein the gas chamber is in the oxygen-free environment. The measuring method comprises the steps of (S1) obtaining a gas chamber in a vacuum environment; (S2) connecting the VOC gas sensor with a voltage dividing resistor in series, so as to form a voltage dividing circuit; (S3) distributing gas; (S4) measuring output voltage of the voltage dividing resistor, calculating to obtain voltage in measured gas when the VOC gas sensor is adsorbed, and selecting an appropriate voltage dividing resistor; (S5) desorbing the VOC gas sensor, measuring the output voltage of the voltage dividing resistor, and calculating to obtain voltage in air after the VOC gas sensor is desorbed; and (S6) calculating to obtain the gas response sensitivity S. By using the measuring system and the measuring method, the response characteristic of the VOC gas sensor in to-be-measured gas in the oxygen-free environment can be obtained.

Description

technical field [0001] The invention relates to a gas sensitivity measurement system and method, in particular to a gas response sensitivity measurement system and method in a non-oxygen environment. Background technique [0002] At present, in the development process of gas sensors, it is necessary to study the gas response characteristics of the sensors under different environmental and working conditions, measure the advantages and disadvantages of the sensors, and find out the best working conditions of the sensors. This is inseparable from good testing equipment. Generally, when a detectable gas is present, the higher the concentration of the gas, the higher the conductivity of the sensor. This change in conductivity is converted into an output signal corresponding to the gas concentration. The characteristics of VOC gas sensors in aerobic environments have been widely studied. However, in industrial practical applications, gas detection often needs to be carried out i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
Inventor 孙炎辉杜海英宋鹏钱瑞陈诗尧
Owner DALIAN NATIONALITIES UNIVERSITY
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