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Method for detecting gas concentration in real time by using gas sensor

A gas sensor, real-time detection technology, applied in the direction of material resistance, can solve the problem that the concentration detection method cannot be widely applied to different types of gas sensors, etc., to solve the basic resistance instability and drift, eliminate environmental interference, and reduce the test environment. Effect

Active Publication Date: 2019-04-26
慧闻(深圳)纳米科技有限公司
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Problems solved by technology

[0006] Another object of the present invention is to solve the technical problem that the concentration detection method in the prior art cannot be widely applied to different types of gas sensors

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  • Method for detecting gas concentration in real time by using gas sensor
  • Method for detecting gas concentration in real time by using gas sensor
  • Method for detecting gas concentration in real time by using gas sensor

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Embodiment Construction

[0033] figure 1 A schematic flowchart of a method for real-time detection of gas concentration using a gas sensor according to an embodiment of the present invention is shown. figure 2 A schematic overall flowchart of a method for real-time detection of gas concentration using a gas sensor according to an embodiment of the present invention is shown. Such as figure 1 and figure 2 As shown, the method includes:

[0034] Step S1, collect the resistance value of the gas sensor in real time, and calculate the resistance change rate of the gas sensor within a preset period of time in real time, and obtain the data set {ΔT 1 , ΔT 2 ,...,ΔT n} one-to-one data set {θ 1 , θ 2 ,...,θ n}, where ΔT n is the nth preset period, θ n is the corresponding resistance change rate within the nth preset period;

[0035] Step S2, predicting whether the target gas exists in the air at the current moment according to whether the target gas exists in the air at the previous moment;

[00...

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Abstract

The invention provides a method for detecting gas concentration in real time by using a gas sensor. The method comprises the steps of collecting a resistance value of the gas sensor in real time, andcalculating resistance change rates of the gas sensor in a preset time period in real time; according to the judgment about whether or not target gas exists in air at a previous moment, prejudging whether or not the target gas exists in air at a current moment; if there is no target gas, judging whether or not there are m-x resistance change rates greater than a first resistance change rate threshold value thetar1 in the continuous m resistance change rates, and if yes, calculating a first response value alpha1 of the sensor at this moment, wherein m is a positive integer greater than zero andsmaller than n, and x is a positive integer far smaller than m; judging whether or not the first response value alpha1 is greater than a first response threshold value alphas1, and if yes, determining that the target gas exists in the current air; calling a response value-concentration formula, and calculating the concentration value of the target gas based on the response value-concentration formula. The method solves the problem of basic resistance drift.

Description

technical field [0001] The invention relates to the technical field of gas concentration detection, in particular to a method for real-time detection of gas concentration using a gas sensor. Background technique [0002] The gas sensor is to convert the information related to the gas type and concentration into changes in electrical signals. According to the changes in these electrical signals, the qualitative and quantitative identification and judgment of the gas to be measured in the environment can be achieved, so that real-time detection of specific gases, Monitoring and alarming. Traditional sensor signal processing methods cannot overcome the measurement errors caused by baseline drift and insufficient long-term stability. [0003] At present, in the commonly used gas detection technology, most gas sensors detect the gas concentration mainly by judging whether there is a target gas according to the resistance value of the gas sensor before and after contacting the ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
CPCG01N27/04
Inventor 蔡晓娟鲁一江孙旭辉张平平史志存张永超王龙辉
Owner 慧闻(深圳)纳米科技有限公司
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