Device for detecting target gas concentration in mixed gas

Abstract

The invention relates to a device for detecting target gas concentration in mixed gas. The device comprises a light source (1), a detector (2) and a light filtering mechanism (3); the filtering mechanism (3) is located between the light source (1) and the detector (2), and the detector (2) is located on a propagation path of a light signal sent out by the light source (1); the light filtering mechanism (3) comprises a light filter wheel (301) and a motor (302) for controlling the light filter wheel (301); the light filtering mechanism (3) further comprises a target gas light filter (303) on the light filter wheel (301), and an interference gas light filter (304) for detecting interference gas causing interference on the target gas in the mixed gas and with the waveband coinciding with an absorption peak with the target gas at the spectrum absorption area, and at least one reference light filter (305) for providing fixed reference for different detection environments. The device for detecting the target gas concentration in the mixed gas has the features of being high in sensitivity and high in detection precision.

Description

technical field [0001] The invention relates to the field of gas detection, in particular to a device for detecting the concentration of a target gas in a mixed gas. Background technique [0002] With the continuous improvement of gas alarm technology, more and more families have installed and used it, but the traditional electrochemical alarm has shortcomings such as short service life and high false alarm rate. Although infrared gas detectors have the advantages of not being easily damaged, high sensitivity, and long service life, the use of integrated multi-channel infrared detectors or multiple sensors is expensive, and different detectors or each channel of the same detector have different performances. There are also inconsistencies in the changes, resulting in a decrease in detection accuracy. Simple detection of the gas composition or the concentration of the contained gas in the mixed gas without the removal of gas interference leads to inaccurate detection results...

AI Technical Summary

Problems solved by technology

[0002] With the continuous improvement of gas alarm technology, more and more families have installed and used it, but the traditional electrochemical alarm has the disadvantages of short service life and high false alarm rate.

Although infrared gas detectors have the advantages of not being easily damaged, high sensitivity, and long service life, the use of integrated multi-channel infrared detectors or the use of multiple sensors is expensive, and different detectors or each channel of the same detector have different performances. There are also inconsistencies in the changes, resulting in a decrease in detection accuracy

Simply detect the composition of the gas in the mixed gas or the concentration of the contained gas, without the removal of gas interference, resulting in inaccurate detection results

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