Gas detection method

Abstract

The invention provides a gas detection method which comprises the steps of using at least two gas sensors to constitute an array; setting inter-electrode voltage of the gas sensors to be lower than breakdown voltage, to make the sensors in non-self-sustaining discharge state; selecting detection starting voltage and ending voltage, selecting 2<k> detection voltage points at equal interval in the voltage range, recording the discharge current values of the m-th sensor at each detection voltage point, dividing the discharge current values by the discharge voltage values to obtain electric conductivity of to-be-measured gas, to obtain anode and cathode sensor detection data sets; selecting a data coupling coefficient to couple detection data of all gas sensors into one set; fitting the 2<k> discrete points in the detection data set into a detection electric conductivity curve by spline interpolation algorithm; inputting the curve into a tuning stochastic resonance system, and calculating signal-to-noise ratio curve; comparing the maximum value of the signal-to-noise ratio curve with a preset signal-to-noise ratio characteristic value, to determine concentration or type of the to-be-measured gas.

Description

technical field [0001] The invention belongs to the technical field of gas analysis, and in particular relates to a gas detection method. Background technique [0002] Technological progress and rapid industrial development have brought rich material life to human beings, but also brought serious issues of environmental protection. Inert gases are widely used due to their unique properties, sulfur hexafluoride (SF 6 ) as an example, because of its stable physical and chemical properties, it is widely used in electrical equipment insulating gas, tracer gas, etchant, carrier gas, refrigerant, etc. Sulfur hexafluoride is colorless, odorless, non-toxic, and its specific gravity is greater than that of air. However, after people inhale a mixture of sulfur hexafluoride and oxygen with a volume ratio of 4:1, they will experience numbness of limbs and suffocation. In power plants and power distribution rooms of power plants, sulfur hexafluoride leaked from equipment is deposited o...

AI Technical Summary

Problems solved by technology

[0007] At the same time, in the self-sustained dark discharge state, although the gas emits light, the current tends to be saturated and generates heat. Due to the small size of the electrode, the slight deformation of the electrode due to heat also has a non-negligible impact on the detection accuracy.

Therefore, the above factors greatly limit the practical application of ionization gas sensors.

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