CN108107086A - A kind of gas detection method and gas sensor based on array gas sensor - Google Patents
A kind of gas detection method and gas sensor based on array gas sensor Download PDFInfo
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- CN108107086A CN108107086A CN201711322268.7A CN201711322268A CN108107086A CN 108107086 A CN108107086 A CN 108107086A CN 201711322268 A CN201711322268 A CN 201711322268A CN 108107086 A CN108107086 A CN 108107086A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
- G01N27/122—Circuits particularly adapted therefor, e.g. linearising circuits
Abstract
The present invention provides a kind of gas detection methods and gas sensor based on array gas sensor, belong to gas identification field.The method comprises the following steps：The resistance value of array gas sensor is gathered in real time；The resistance change rate of sensor of interest is calculated, often gathers the resistance change rate that a new resistance value just calculates once the gas sensor；Judge whether to have in sensor of interest M in N number of continuous resistance change rate of at least one gas sensor to be more than resistance change rate threshold value；If so, judging whether majority of gas sensor is more than the threshold of sensitivity to the sensitivity of all object gas；If so, using for calculate the last resistor value of first resistance change rate in N number of continuous resistance change rate acquisition time point as gas sampling point.The present invention also provides corresponding gas sensors.The present invention still valid in the case where basic resistance is unstable can identify gas sampling point, have a wide range of application.
Description
Technical field
The present invention relates to gases to identify field, more particularly to a kind of gas detection method based on array gas sensor
And sensor.
Background technology
Gas sensor is the variation that it is converted into electric signal with gaseous species and concentration dependent information, according to these
The variation of electric signal reaches the qualitative and quantitative identification and judgement under test gas in the environment, so as to carry out specific gas
Real-time detection, monitoring, the alarm of body.In practical applications, when not known when that under test gas is come in, it is necessary to one
The method that kind differentiates under test gas sample injection time point.
At present in the gas detection technology of generally use, most of gas sensor is to typically no in gas detection method
It is especially set out on gas into the determination methods of fashionable sample injection time point, traditional method is mainly connecing according to gas sensor
Its sensor component resistance value all judges whether there is object gas sample introduction in a specific range before and after touching gas.
But requirement of this method for judging gas sampling to gas sensor is relatively high, it is necessary to gas sensor
Basic resistance it is more stable, and the sensor responded in the environment of certain concentration gas resistance should in certain scope,
Therefore the method for the prior art for judging gas sampling is not suitable for the unstable sensor of basic resistance, and application range is more
Limitation.
The content of the invention
It is an object of the present invention to provide a kind of gas detection method based on array gas sensor, can apply
In polytype gas sensor.
Another object of the present invention is to provide for a kind of gas sensor, can be in the case where basic resistance is unstable
It is still valid to have recognised that object gas, and judge gas sampling point.
Particularly, the present invention provides a kind of gas detection method based on array gas sensor, comprise the following steps：
The resistance value of each gas sensor in the array gas sensor is gathered in real time；
Resistance change rate of each gas sensor in sensor of interest in the first preset time is calculated, wherein,
A new resistance value for often collecting gas sensor just calculates once the resistance change rate of the gas sensor, the mesh
Mark sensor is to have a gas sensor of response or multiple gas to all object gas in the array gas sensor
Body sensor combines the gas sensor group to be formed；
Judge whether have in the sensor of interest in N number of continuous resistance change rate of at least one gas sensor
M resistance change rate be more than resistance change rate threshold value, wherein, N >=5, M >=1/2N, M and N are integer；
If so, judge majority of gas sensor in the array gas sensor in the second preset time to institute
Whether the sensitivity for stating all object gas is more than the threshold of sensitivity；
If so, by for calculate first resistance change rate in N number of continuous resistance change rate last
The time point of a resistance value acquisition is as gas sampling point.
Optionally, resistance value of each gas sensor in the sensor of interest is calculated in the first preset time
It is further comprising the steps of before change rate：
Data prediction is carried out to the resistance value of each gas sensor in the sensor of interest of acquisition.
Optionally, M=N-1 or M=N-2.
Optionally, when the sensor of interest is to have response to all object gas in the array gas sensor
When multiple gas sensors combine the gas sensor group to be formed, each gas sensor in the gas sensor group is right
Its object gas that can be responded does not respond to or with the consistent response in direction.
Optionally, in the array gas sensor is gathered in real time before the resistance value of each gas sensor, also
Comprise the following steps：
By testing and the resistance change rate threshold value and the threshold of sensitivity being determined to the analysis of experimental data.
Particularly, the present invention also provides a kind of gas sensor, including：
Information acquisition unit, for gathering the resistance value of each gas sensor in array gas sensor in real time；
Computing unit, for calculating resistance value of each gas sensor in the first preset time in sensor of interest
Change rate, wherein, a new resistance value for often collecting gas sensor just calculates once the resistance value of the gas sensor
Change rate, the sensor of interest are that a gas for having response in the array gas sensor to all object gas passes
Sensor or multiple gas sensors combine the gas sensor group to be formed；
Judging unit, for judging whether there be the N number of continuous of at least one gas sensor in the sensor of interest
M resistance change rate in resistance change rate is more than resistance change rate threshold value, wherein, N >=5, M >=1/2N, M and N are equal
For integer,
The judging unit is additionally operable to judge that the majority of gas sensor in the array gas sensor is pre- second
If whether the threshold of sensitivity is more than to the sensitivity of all object gas in the time；With
Recognition unit, for that will be used to calculate first resistance change rate in N number of continuous resistance change rate
The time point of last resistor value acquisition is as gas sampling point.
Optionally, further include：
Data processing unit, for each gas sensor in the sensor of interest is calculated in the first preset time
Before interior resistance change rate, data are carried out to the resistance value of each gas sensor in the sensor of interest of acquisition
Pretreatment.
Optionally, M=N-1 or M=N-2.
Optionally, when the sensor of interest is to have response to all object gas in the array gas sensor
When multiple gas sensors combine the gas sensor group to be formed, each gas sensor in the gas sensor group is right
Its object gas that can be responded does not respond to or with the consistent response in direction.
Optionally, the resistance change rate threshold value and the threshold of sensitivity pass through experiment and the analysis to experimental data
It determines.
The gas detection method and gas sensor of the present invention, by the resistance change rate to sensor of interest and to gas
The judgement of the sensitivity of body and come the identification of realizing gas sampling point, such gas sensing to the identification of gas sampling point no longer according to
Rely the degree of stability of the basic resistance in sensor in itself, the gas sensor is remained in the case where basic resistance is unstable
Effectively identify gas sampling point, the gas sampling recognition methods can be applied to polytype gas sensor, be applicable in
Scope is wide.
Further, the gas detection method just because of the present invention is applied widely, the range of choice of gas sensor
Bigger, the sensor of any basic resistance can be used, and reduce the cost of manufacture of high-volume gas sensor.
Further, which can solve the problems, such as sensor integration resistance drift.
Further, change rate of the gas detection method by resistance value and the sensitivity to gas judge to realize gas
The identification of body sample delivery point can effectively eliminate environmental disturbances.
According to the accompanying drawings to the detailed description of the specific embodiment of the invention, those skilled in the art will be brighter
The above and other objects, advantages and features of the present invention.
Description of the drawings
Some specific embodiments of detailed description of the present invention by way of example, and not by way of limitation with reference to the accompanying drawings hereinafter.
Identical reference numeral denotes same or similar component or part in attached drawing.It should be appreciated by those skilled in the art that these
What attached drawing was not necessarily drawn to scale.In attached drawing：
Fig. 1 is the FB(flow block) of gas sampling point recognition methods according to an embodiment of the invention；
Fig. 2 is the logic chart of gas sampling point recognition methods in accordance with another embodiment of the present invention；
Fig. 3 is the system block diagram of gas sensor according to an embodiment of the invention；
Fig. 4 is the system block diagram of gas sensor in accordance with another embodiment of the present invention.
Specific embodiment
Fig. 1 is the FB(flow block) of gas sampling point recognition methods according to an embodiment of the invention.As shown in Figure 1, this
Invention provides a kind of gas sampling point recognition methods based on gas sensor, may comprise steps of in general manner：
S100：The resistance value of each gas sensor in the array gas sensor is gathered in real time.
S200：Calculate resistance change of each gas sensor in the first preset time in the sensor of interest
Rate, wherein, a new resistance value for often collecting gas sensor just calculates once the resistance change of the gas sensor
Rate, the sensor of interest are a gas sensor for having to all object gas in the array gas sensor response
Or multiple gas sensors combine the gas sensor group to be formed.
S300：Judge whether to have in the sensor of interest N number of continuous resistance value of at least one gas sensor to become
M resistance change rate in rate is more than resistance change rate threshold value, if into S400, wherein, N >=5, M >=1/2N, M
It is integer with N, optionally, M=N-1 or M=N-2.
S400:Judge the majority of gas sensor in the array gas sensor in the second preset time to described
Whether the sensitivity of all object gas is more than the threshold of sensitivity, if into S500.
S500:By for calculate first resistance change rate in N number of continuous resistance change rate the last one
The time point of resistance value acquisition is as gas sampling point.
The gas detection method of the present invention, by the resistance change rate to sensor of interest and to the sensitivity of gas
Judge and come the identification of realizing gas sampling point, such gas sensor is no longer dependent on sensor to the identification of gas sampling point
The degree of stability of the basic resistance of itself remains to effectively identify gas sampling point in the case where basic resistance is unstable, because
This can be applied to polytype gas sensor, applied widely.
Further, the gas sampling point recognition methods just because of the present invention is applied widely, the choosing of gas sensor
Scope bigger is selected, the sensor of any basic resistance can be used, and reduce the cost of manufacture of high-volume gas sensor.
Further, change rate of the gas sampling point recognition methods by resistance value and the sensitivity to gas judge come
It realizes the identification of gas sampling point, environmental disturbances can be effectively eliminated, unlike passing through sensor component resistance in the prior art
Value all judges the method for object gas sample delivery point in a specific range, affected by environment larger.
Fig. 2 is the logic chart of gas sampling point recognition methods in accordance with another embodiment of the present invention.As shown in Fig. 2,
In one embodiment, before S200, S150 is further included：Data prediction is carried out to the resistance value of acquisition.For example, it can pass through
Data rolling average is carried out to resistance value, to remove the burr in data；Or data normalization processing, to balance each gas
The influence degree that sensor responds gas.The data prediction can also be of the prior art and any other improve number
According to quality or the preprocess method of help data analysis, do not limit herein.
As shown in Fig. 2, when S300 or S400 are judged as NO, S100 is returned to, continuation gathers the array gas in real time
The resistance value of each gas sensor in sensor.
In one embodiment, in the array gas sensor is gathered in real time the resistance value of each gas sensor it
Before, it is further comprising the steps of：By testing and the resistance change rate threshold value and the spirit being determined to the analysis of experimental data
Sensitivity threshold value.Such as enter gas sensor to object gas under air background by gathering a collection of gas sensor in real time
Resistance value in the process, analysis resistance Value Data is so that it is determined that the resistance change rate threshold value and the threshold of sensitivity.
The present embodiment is that the sensor of interest is to have response to all object gas in the array gas sensor
A gas sensor when situation.Assuming that the array gas sensor is made of A individual sensors, it is respectively gas
Body sensor 1, gas sensor 2, gas sensor 3 ... ..., gas sensor A, judging can be right in A gas sensor
All object gas have an individual gas sensor for response, such as gas sensor 1, and all object gas can
Think one or more gases.
First, the resistance value of each gas sensor in the array gas sensor, extraction wherein gas are gathered in real time
The resistance value of sensor 1 simultaneously carries out data prediction to the resistance value of gas sensor 1.Then, gas sensor 1 is calculated the
Resistance change rate in one preset time T 1, specifically, such as T1=21s, it is assumed that it sets and takes a resistance value per 3s, then
7 resistance values can be gathered in 21s, calculate a resistance change rate R1 by this 7 resistance values, computational methods can be
Any one method for calculating resistance change rate in the prior art.Then the resistance for gathering a gas sensor 1 again every 3 seconds
Value calculates the resistance change rate R2 of the resistance change rate, i.e. 3s-24s inner sensors 1 in second T1, successively class at this time
It pushes away, calculates N resistance change rates, R1, R2 ... ..., RN.Next, it is determined that N number of continuous resistance value of gas sensor 1 becomes
Whether there is M resistance change rate to be more than resistance change rate threshold value in rate, such as N takes 7, M to take 6.In M resistance change
Rate is all higher than resistance change rate threshold value, then judges that the majority of gas sensor in the array gas sensor is pre- second
If whether being more than the threshold of sensitivity to the sensitivity of all object gas in time T2, be will be used to calculate it is N number of continuous
Resistance change rate in first resistance change rate last resistor value acquisition time point as gas sampling
Point.The other values that the cycle of T1, M, N and gathered data can set as the case may be, are not limited thereto.
In another embodiment, when the sensor of interest is equal to all object gas in the array gas sensor
When the multiple gas sensors for having response combine the gas sensor group to be formed, each gas in the gas sensor group passes
Sensor does not respond to its object gas that can be responded or with the consistent response in direction.For example, the array gas
Sensor is made of A gas sensor, respectively sensor 1, gas sensor 2, gas sensor 3 ... ..., gas sensing
Device A first determines whether can there be one group of gas sensor of response in A gas sensor to all object gas, such as by
The gas sensor group that gas sensor 1, gas sensor 2 and gas sensor 3 form, wherein assuming that object gas includes P
Gas, M gases and N gases, then the gas sensor group can at least respond P gases, M gases and N gases.Such as
Gas sensor 1 can respond P gases, and gas sensor 2 can respond P gases and M gases, and gas sensor 3 can be with
To M gases and the response of N gases or meet the combination for other gas sensors for responding all object gas.The gas
Any one gas sensor does not respond to its gas that can be responded or consistent with direction in body sensor group
Response, or such as gas sensor 2 P gases are not responded to and have response to M gases；Have to P gases and M gases
The consistent response in direction, i.e., when P gases and M gases enter gas sensor, all show as resistance change rate increase or
Person shows as the reduction of resistance change rate.
In this case, first, the resistance value of each gas sensor in the array gas sensor is gathered in real time, is carried
Take the wherein resistance value of gas sensor group and data prediction carried out to the resistance value of gas sensor group, in the present embodiment with
The gas sensor group citing that gas sensor 1, gas sensor 2 and gas sensor 3 form.Secondly, gas is calculated respectively
The resistance change rate of sensor 1, gas sensor 2 and gas sensor 3 in the first preset time T 1, circular
Consistent for the computational methods of gas sensor 1 with above-mentioned sensor of interest, details are not described herein.Again, determine whether at least
One gas sensor is more than resistance value to M resistance change rate in N number of continuous resistance change rate of object gas
Change rate threshold value, such as the M change rates of gas sensor 2 are all higher than the resistance change rate threshold value.Finally, judge
Majority of gas sensor in the array gas sensor is in the second preset time T 2 to all object gas
Whether sensitivity is more than the threshold of sensitivity, if so, show there is object gas, and gas sensor 2 is N number of continuous for calculating
Resistance change rate in first resistance change rate of calculating last resistor value acquisition time point as gas
Sample delivery point.
This sensor of interest is that multiple gas sensors in array gas sensor combine the gas sensor to be formed
In the case of group, being not required in array gas sensor at least will to required identification gas there are an individual gas sensor
There is response, add the range of choice of individual gas sensor in array gas sensor.
It is appreciated that when the array gas sensor is only there are one during gas sensor, the present invention is single gas
The gas detection method of body sensing.
Fig. 3 is the system block diagram of gas sensor according to an embodiment of the invention.The present invention also provides a kind of gas
Body sensor, as shown in figure 3, it can include information acquisition unit 10, computing unit 20, judging unit 30 and know in general manner
Other unit 40.Described information collecting unit 10 is used to gather the electricity of each gas sensor in array gas sensor in real time
Resistance value.The computing unit 20 is used to calculate resistance of each gas sensor in the first preset time in sensor of interest
It is worth change rate, wherein, a new resistance value for often collecting gas sensor just calculates once the resistance of the gas sensor
It is worth change rate, the sensor of interest is a gas for having to all object gas in the array gas sensor response
Sensor or multiple gas sensors combine the gas sensor group to be formed.The judging unit 30 is used to judge that the target passes
Whether there is M resistance change rate in N number of continuous resistance change rate of at least one gas sensor to be more than in sensor
Resistance change rate threshold value, wherein, N >=5, M >=1/2N, M and N are integer.Optionally, M=N-1 or M=N-2.It is described to sentence
Disconnected unit 30 is additionally operable to judge majority of gas sensor in the array gas sensor in the second preset time to institute
Whether the sensitivity for stating all object gas is more than the threshold of sensitivity.The recognition unit 40 is N number of continuous for that will be used to calculate
Resistance change rate in first resistance change rate last resistor value acquisition time point as gas sampling
Point.The resistance change rate threshold value and the threshold of sensitivity are determined by experiment, the embodiment of detailed process and front
Unanimously, details are not described herein.
The gas detection method of the present invention judges the resistance change rate and array of sensor of interest by judging unit 30
Sensitivity of the gas sensor to gas, and come the identification of realizing gas sampling point, such gas sensing is to gas sampling point
Identification is no longer dependent on the degree of stability of the basic resistance of sensor in itself, is remained in the case where basic resistance is unstable effectively
Identify gas sampling point.
Fig. 4 is the system block diagram of gas sensor in accordance with another embodiment of the present invention.As shown in figure 4, in the present invention
One embodiment in, the gas sensor further includes data processing unit 15, in the sensor of interest is calculated
Resistance change rate of each gas sensor in the first preset time before, data are carried out to the resistance value of acquisition
Pretreatment.It for example, can be by carrying out data rolling average or data normalization processing etc. to resistance value.The data prediction
It can also be any other preprocess method for improving the quality of data or helping data analysis of the prior art, herein not
It limits.
In one embodiment, when the sensor of interest is to have to all object gas in the array gas sensor
When multiple gas sensors of response combine the gas sensor group to be formed, each gas sensing in the gas sensor group
Device does not respond to its object gas that can be responded or with the consistent response in direction.Specific gas sampling point identification
Process is consistent with foregoing embodiment, and details are not described herein.
This sensor of interest is that multiple gas sensors in array gas sensor combine the gas sensor to be formed
In the case of group, being not required in array gas sensor at least will to required identification gas there are an individual gas sensor
There is response, add the range of choice of individual gas sensor in array gas sensor.
So far, although those skilled in the art will appreciate that detailed herein have shown and described multiple showing for the present invention
Example property embodiment, still, without departing from the spirit and scope of the present invention, still can according to the present disclosure directly
Determine or derive many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes
It is set to and covers other all these variations or modifications.
Claims (10)
1. a kind of gas detection method based on array gas sensor, which is characterized in that comprise the following steps：
The resistance value of each gas sensor in the array gas sensor is gathered in real time；
Resistance change rate of each gas sensor in sensor of interest in the first preset time is calculated, wherein, often adopt
A new resistance value for collecting gas sensor just calculates once the resistance change rate of the gas sensor, and the target passes
Sensor is to have a gas sensor of response or multiple gases to pass in the array gas sensor to all object gas
Sensor combines the gas sensor group to be formed；
Judge the M for whether having in N number of continuous resistance change rate of at least one gas sensor in the sensor of interest
A resistance change rate is more than resistance change rate threshold value, wherein, N >=5, M >=1/2N, M and N are integer；
If so, judge majority of gas sensor in the array gas sensor in the second preset time to the institute
Whether the sensitivity for having object gas is more than the threshold of sensitivity；
If so, by for calculate first resistance change rate in N number of continuous resistance change rate the last one electricity
The time point of resistance value acquisition is as gas sampling point.
2. gas detection method according to claim 1, which is characterized in that each in the sensor of interest is calculated
It is further comprising the steps of before resistance change rate of the gas sensor in the first preset time：
Data prediction is carried out to the resistance value of each gas sensor in the sensor of interest of acquisition.
3. gas detection method according to claim 1, which is characterized in that M=N-1 or M=N-2.
4. gas detection method according to any one of claim 1-3, which is characterized in that when the sensor of interest is
The multiple gas sensors for having response to all object gas in the array gas sensor combine the gas sensing to be formed
During device group, each gas sensor in the gas sensor group its object gas that can be responded is not responded to or
With the consistent response in direction.
5. gas detection method according to claim 4, which is characterized in that gathering the array gas sensing in real time
It is further comprising the steps of in device before the resistance value of each gas sensor：
By testing and the resistance change rate threshold value and the threshold of sensitivity being determined to the analysis of experimental data.
6. a kind of gas sensor, which is characterized in that including：
Information acquisition unit, for gathering the resistance value of each gas sensor in array gas sensor in real time；
Computing unit, for calculating resistance change of each gas sensor in the first preset time in sensor of interest
Rate, wherein, a new resistance value for often collecting gas sensor just calculates once the resistance change of the gas sensor
Rate, the sensor of interest are a gas sensor for having to all object gas in the array gas sensor response
Or multiple gas sensors combine the gas sensor group to be formed；
Judging unit, for judging the N number of continuous resistance for whether having at least one gas sensor in the sensor of interest
M resistance change rate being worth in change rate is more than resistance change rate threshold value, wherein, N >=5, M >=1/2N, M and N are whole
Number,
The judging unit is additionally operable to judge majority of gas sensor in the array gas sensor when second is default
Whether the interior sensitivity to all object gas is more than the threshold of sensitivity；With
Recognition unit, for that will be used to calculate the last of first resistance change rate in N number of continuous resistance change rate
The time point of one resistance value acquisition is as gas sampling point.
7. gas sensor according to claim 6, which is characterized in that further include：
Data processing unit, for each gas sensor in the sensor of interest is calculated in the first preset time
Before resistance change rate, data are carried out to the resistance value of each gas sensor in the sensor of interest of acquisition and are located in advance
Reason.
8. gas sensor according to claim 6, which is characterized in that M=N-1 or M=N-2.
9. according to the gas sensor any one of claim 6-8, which is characterized in that when the sensor of interest is institute
Multiple gas sensors that state has response in array gas sensor to all object gas combine the gas sensor to be formed
During group, each gas sensor in the gas sensor group is not responded to or had to its object gas that can be responded
There is the response that direction is consistent.
10. gas sensor according to claim 9, which is characterized in that the resistance change rate threshold value and the spirit
Sensitivity threshold value is by testing and the analysis of experimental data being determined.
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| CN109682858B (en) * | 2018-12-19 | 2021-09-17 | 苏州慧闻纳米科技有限公司 | Method for detecting gas concentration in real time by using gas sensor |
| CN109632891B (en) * | 2018-12-19 | 2022-04-08 | 江苏智闻智能传感科技有限公司 | Method for monitoring gas type and concentration by using array gas sensor |
| CN111579595A (en) * | 2019-02-19 | 2020-08-25 | 安徽康佳同创电器有限公司 | Odor sensor environment index correction method and system and odor sensor |
| CN110927217A (en) * | 2019-11-22 | 2020-03-27 | 苏州慧闻纳米科技有限公司 | Food freshness identification method based on electronic nose system and electronic nose system |
| CN112782233A (en) * | 2020-12-30 | 2021-05-11 | 江苏智闻智能传感科技有限公司 | Gas identification method based on array gas sensor |
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