Gas detection device and gas detection method thereof

Abstract

The embodiment of the invention discloses a gas detection device which comprises a first valve, a second valve, a gas concentrator, a reference detector array, a test detector array, a gas pump and a controller, wherein the first valve is connected with the concentrator in series to form a first gas branch; the second valve forms a second gas branch, and the second gas branch is connected with the first gas branch in parallel; the reference detector array is connected with the test detector array in parallel to form a third gas branch; one end of the third gas branch is connected with the first gas branch and the second gas branch, and the other end of the third gas branch is connected to the gas pump; and the controller is electrically connected with the first valve, the second valve, the gas concentrator, the reference detector array, the test detector array and the gas pump and used for controlling the work thereof. The surface acoustic wave sensor gas detection device based on bypass and feedback has the advantages of simple gas circuits and low cost; and a gas detection method using the gas detection device is high in detection efficiency.

Description

[0001] technical field [0002] The invention relates to the technical field of gas detection, in particular to a gas detection device and a gas detection method thereof. Background technique [0003] SAW (Surface Acoustic Wave) sensors have the advantages of high sensitivity, repeatability and reliability, and are widely used in gas detection fields such as environmental protection, military affairs, and anti-terrorism security. With the continuous increase of application requirements, new requirements are put forward for the timeliness, accuracy and stability of gas detection instruments. SAW sensors have the following advantages: [0004] 1. High sensitivity and high linearity: SAW sensors have a large energy density and are very sensitive to surface disturbances, and the fundamental frequency of SAW sensors can be processed to several GHz, so the detection sensitivity is high. [0005] 2. Good repeatability and reliability: The key components of the SAW sensor are SAW ...

AI Technical Summary

Problems solved by technology

In this kind of gas path, although the detection precision and accuracy can be improved, there is a high degree of consistency in the concentrator and chromatographic requirements, and it is difficult to achieve consistency in the process

[0009] For the traditional SAW-based gas detection devices, in order to meet the accuracy requirements, people often adopt the method of increasing the gas concentration in the gas circuit design, but the problem that comes with it is that for low-concentration gas detection and In other words, the enricher is constantly performing the "adsorption-desorption" process, and the "adsorption-desorption" step takes up a lot of time, which greatly reduces the timeliness of the entire system

Moreover, after the enricher is used many times, the surface aging and the analysis process are not sufficient. After a long time of use, the "accuracy" of its detection is also affected to a certain extent.

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