Method for improving concentration detection accuracy of mixed gas

Abstract

The invention discloses a method for improving the concentration detection accuracy of mixed gas. The method comprises the following steps: firstly selecting gas with the lowest cross sensitivity to ameasuring probe from the mixed gas as first reference gas and obtaining a concentration measurement value Cgo of the first reference gas through the measuring probe; after the first reference gas isremoved, selecting gas with the lowest cross sensitivity to the measuring probe from the mixed gas as second reference gas and obtaining a concentration measurement value Cg1 of the second reference gas through the measuring probe; after the interference of the first reference gas to the measurement concentration of the second reference gas is eliminated by a compensation algorithm, obtaining a concentration value Cgr1 after second reference gas compensation and replacing the Cg1 with the concentration value Cgr1; in a same manner, sequentially obtaining concentration values of new reference gas remaining the mixed gas till the to-be-measured gas required is processed into reference gas by the compensation algorithm. The method disclosed by the invention has the benefit that the influenceof interfering gas on the measurement accuracy is significantly reduced, so that the gas measurement accuracy is improved.

Description

technical field [0001] The invention relates to the technical field of ambient gas detection, in particular to a method for improving the detection accuracy of mixed gas concentration. Background technique [0002] Major sources of danger in the urban pipe network mainly refer to explosive and toxic gases in sewer pipes, septic tanks and other places. Due to the humid and relatively closed environment of the urban pipe network, waste water and sewage decompose a large amount of flammable, explosive, toxic and harmful gases such as CH 4 、H 2 S, CO, etc. accumulate in the space of the pipe network. Some of the harmful gases are greenhouse gases, which lead to high temperatures in the urban pipe network, which provides a more suitable environment for microbial fermentation. If it cannot be pumped out and disposed of in time, once the concentration of the above-mentioned gases exceeds the standard, it may cause explosions or personnel poisoning accidents, or cause adverse con...

AI Technical Summary

Problems solved by technology

[0005] The previous gas detection method is usually: through the known measurement of ambient gas composition, select a measurement probe with low cross-sensitivity of gases other than the gas to be measured, and perform appropriate data processing through algorithms to obtain the current concentration of the gas to be measured, The disadvantage of this method is that the concentration of the interfering gas cannot be obtained during data processing, so the accuracy of the concentration of the gas to be measured is not high

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