High-sensitivity multi-gas concentration detection system with constant-temperature control function, and control method

Abstract

The invention discloses a high-sensitivity multi-gas concentration detection system with a constant-temperature control function, and a control method, and belongs to the technical field of gas sensors. A gas chamber of the detection system adopts a reflection structure; infrared light is reflected on a cavity wall for multiple times on the basis that the gas chamber is designed to be sufficientlysmall, and then the infrared light is transmitted to a pyroelectric detector; the concentrations of different gases are determined by analyzing the change of the infrared light intensity at a specific wavelength; and finally concentration information is displayed on a mobile phone terminal in a wireless transmission mode through a WIFI module. In addition, the gas chamber is formed by the opticalcavity wall with a graphene heating sheet, and the environment temperature of the detection system is controlled to ensure the constant temperature in the gas chamber of a gas sensor, so that the influence of environment temperature change on a detection result is eliminated.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a high-sensitivity multi-gas concentration detection system with a constant temperature control function and a control method. Background technique [0002] With the development of science and technology and social economy, the demand for multi-gas real-time monitoring and analysis in various fields such as mine exploration, chemical production, disaster forecasting, and pollution control has become increasingly prominent. Among the many detection methods of gas concentration, the most common detection techniques are as follows: First, electrochemical method, the gas undergoes redox reaction at the electrode through the action of catalyst and high temperature, which causes the electrical signal between the electrodes to change, so as to detect the gas to be detected. The concentration of gas is measured. This method has low detection accuracy and poor gas selectiv...

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Problems solved by technology

In addition, the ambient temperature has a great influence on the measurement results of the gas sensor. At present, even if the influence of temperature on the measurement results of the detector can be partially removed by the reference circuit of the detector, the temperature will also significantly affect the gas absorption efficiency, resulting in gas concentration measurement. error

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