CN108107086B - Gas detection method based on array gas sensor and gas sensor - Google Patents
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Abstract
The invention provides a gas detection method based on an array gas sensor and the gas sensor, and belongs to the field of gas identification. The method comprises the following steps: collecting the resistance value of the array gas sensor in real time; calculating the resistance value change rate of the target sensor, and calculating the resistance value change rate of the gas sensor once every time a new resistance value is acquired; judging whether M of N continuous resistance value change rates of at least one gas sensor in the target sensor is greater than a resistance value change rate threshold value; if so, judging whether the sensitivity of most of the gas sensors to all the target gases is greater than a sensitivity threshold value; if so, taking the time point of the last resistance value acquisition for calculating the first resistance value change rate in the N continuous resistance value change rates as a gas sampling point. The invention also provides a corresponding gas sensor. The method can still effectively identify the gas sampling point under the condition of unstable basic resistance, and has wide application range.
Description
Technical Field
The invention relates to the field of gas identification, in particular to a gas detection method based on an array gas sensor and the sensor.
Background
The gas sensor converts the information related to the type and concentration of the gas into the change of electric signals, and qualitatively and quantitatively identifies and judges the gas to be detected in the environment according to the change of the electric signals, so that the specific gas can be detected, monitored and alarmed in real time. In practical application, when it is not known when a gas to be detected enters, a method for judging the sampling time point of the gas to be detected is needed.
In the currently commonly adopted gas detection technology, most gas sensors generally do not provide a method for judging the sample injection time point when gas enters, and the traditional method mainly judges whether target gas is injected according to the fact that the resistance values of sensor devices of the gas sensors before and after the gas sensors contact the gas are in a specific range.
However, the method for determining gas injection has a relatively high requirement on the gas sensor, the base resistance of the gas sensor needs to be relatively stable, and the response resistance of the sensor in the environment of gas with a specific concentration should be within a certain range, so the method for determining gas injection in the prior art is not suitable for the sensor with unstable base resistance, and the application range is limited.
Disclosure of Invention
An object of the present invention is to provide a gas detection method based on an array gas sensor, which can be applied to various types of gas sensors.
Another object of the present invention is to provide a gas sensor, which can effectively identify whether there is a target gas or not and determine a gas sampling point when the base resistance is unstable.
Particularly, the invention provides a gas detection method based on an array gas sensor, which comprises the following steps:
acquiring the resistance value of each gas sensor in the array gas sensor in real time;
calculating the resistance value change rate of each gas sensor in a target sensor within a first preset time, wherein the resistance value change rate of the gas sensor is calculated once every time a new resistance value of the gas sensor is acquired, and the target sensor is a gas sensor group formed by one or a plurality of gas sensors which are in the array gas sensor and respond to all target gases;
judging whether M resistance value change rates in N continuous resistance value change rates of at least one gas sensor in the target sensor are larger than a resistance value change rate threshold, wherein N is larger than or equal to 5, M is larger than or equal to 1/2N, and M and N are integers;
if so, judging whether the sensitivity of most of the array gas sensors to all the target gases in a second preset time is greater than a sensitivity threshold value;
if so, taking the time point of the last resistance value acquisition for calculating the first resistance value change rate in the N continuous resistance value change rates as a gas sampling point.
Optionally, before calculating the resistance value change rate of each of the target sensors within the first preset time, the method further includes the following steps:
and carrying out data preprocessing on the acquired resistance value of each gas sensor in the target sensors.
Alternatively, M ═ N-1 or M ═ N-2.
Optionally, when the target sensor is a gas sensor group formed by combining a plurality of gas sensors in the array of gas sensors, which are responsive to all target gases, each gas sensor in the gas sensor group has no response or has a response with a consistent direction to the target gas to which it can respond.
Optionally, before acquiring the resistance value of each gas sensor in the array gas sensor in real time, the method further comprises the following steps:
and determining the resistance value change rate threshold value and the sensitivity threshold value through experiments and analysis of experimental data.
In particular, the present invention also provides a gas sensor comprising:
the information acquisition unit is used for acquiring the resistance value of each gas sensor in the array gas sensors in real time;
the calculation unit is used for calculating the resistance value change rate of each gas sensor in the target sensors within a first preset time, wherein the resistance value change rate of the gas sensor is calculated once every time a new resistance value of the gas sensor is acquired, and the target sensors are gas sensor groups formed by one or a plurality of gas sensors which are in the array gas sensors and respond to all target gases;
a judging unit for judging whether M resistance value change rates of N continuous resistance value change rates of at least one gas sensor in the target sensor are larger than a resistance value change rate threshold, wherein N is larger than or equal to 5, M is larger than or equal to 1/2N, M and N are integers,
the judging unit is further used for judging whether the sensitivity of most of the array gas sensors to all the target gases in a second preset time is greater than a sensitivity threshold value; and
and the identification unit is used for taking the time point of the last resistance value acquisition for calculating the first resistance value change rate in the N continuous resistance value change rates as a gas sampling point.
Optionally, the method further comprises:
and the data processing unit is used for preprocessing the acquired resistance value of each gas sensor in the target sensors before calculating the resistance value change rate of each gas sensor in the target sensors in a first preset time.
Alternatively, M ═ N-1 or M ═ N-2.
Optionally, when the target sensor is a gas sensor group formed by combining a plurality of gas sensors in the array of gas sensors, which are responsive to all target gases, each gas sensor in the gas sensor group has no response or has a response with a consistent direction to the target gas to which it can respond.
Optionally, the resistance value change rate threshold and the sensitivity threshold are determined by experiment and analysis of experimental data.
According to the gas detection method and the gas sensor, the identification of the gas sampling points is realized through judging the resistance value change rate of the target sensor and the sensitivity of the gas, so that the identification of the gas sampling points by the gas sensor does not depend on the stability of the basic resistance of the sensor, the gas sensor can still effectively identify the gas sampling points under the condition of unstable basic resistance, and the gas sampling identification method can be applied to various types of gas sensors and has a wide application range.
Furthermore, the gas detection method has wide application range and wider selection range of the gas sensor, and the sensor with any basic resistance can be used, so that the manufacturing cost of the gas sensor in large batch is reduced.
Further, the gas detection method can solve the problem of drift of the base resistance of the sensor.
Furthermore, the gas detection method realizes the identification of the gas sampling point through the change rate of the resistance value and the sensitivity judgment of the gas, and can effectively eliminate the environmental interference.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a block flow diagram of a gas entry point identification method according to one embodiment of the invention;
FIG. 2 is a logic diagram of a gas entry point identification method according to another embodiment of the present invention;
FIG. 3 is a system block diagram of a gas sensor according to one embodiment of the invention;
fig. 4 is a system block diagram of a gas sensor according to another embodiment of the present invention.
Detailed Description
FIG. 1 is a block flow diagram of a gas entry point identification method according to one embodiment of the invention. As shown in fig. 1, the present invention provides a gas sampling point identification method based on a gas sensor, which may generally include the following steps:
s100: the resistance value of each gas sensor in the array gas sensor is acquired in real time.
S200: and calculating the resistance value change rate of each gas sensor in the target sensors within a first preset time, wherein the resistance value change rate of the gas sensor is calculated once every time a new resistance value of the gas sensor is acquired, and the target sensors are gas sensor groups formed by one or a plurality of gas sensors which are in response to all target gases in the array gas sensors.
S300: and judging whether M resistance value change rates in N continuous resistance value change rates of at least one gas sensor in the target sensor are larger than a resistance value change rate threshold value, if so, entering S400, wherein N is larger than or equal to 5, M is larger than or equal to 1/2N, M and N are integers, and optionally, M is N-1 or M is N-2.
S400, judging whether the sensitivity of most of the array gas sensors to all the target gases in a second preset time is greater than a sensitivity threshold value, and if so, entering S500.
And S500, taking the time point of the last resistance value acquisition for calculating the first resistance value change rate in the N continuous resistance value change rates as a gas sampling point.
The gas detection method realizes the identification of the gas sampling points by judging the resistance value change rate of the target sensor and the sensitivity of the gas, so that the identification of the gas sampling points by the gas sensor does not depend on the stability degree of the basic resistance of the sensor, and the gas sampling points can be effectively identified under the condition of unstable basic resistance, thereby being applied to various types of gas sensors and having wide application range.
Furthermore, the gas sampling point identification method has wide application range and larger selection range of the gas sensor, and the sensor with any basic resistance can be used, so that the manufacturing cost of the gas sensor in large batch is reduced.
Further, the gas sampling point identification method realizes identification of the gas sampling point through the change rate of the resistance value and the sensitivity judgment of the gas, can effectively eliminate environmental interference, and is not influenced by the environment greatly by a method of judging the target gas sampling point through the resistance values of the sensor devices in a specific range in the prior art.
FIG. 2 is a logic diagram of a gas entry point identification method according to another embodiment of the present invention. As shown in fig. 2, in an embodiment, before S200, the method further includes S150: and carrying out data preprocessing on the acquired resistance value. For example, the glitch in the data can be removed by performing data moving average on the resistance value; or data normalization processing to balance the degree of influence of each gas sensor on the gas response. The data preprocessing can also be any other preprocessing method in the prior art that can improve the data quality or assist the data analysis, and is not limited herein.
As shown in fig. 2, when the determination in S300 or S400 is negative, the process returns to S100, and the resistance value of each gas sensor in the array gas sensor continues to be acquired in real time.
In one embodiment, before the step of acquiring the resistance value of each gas sensor in the array of gas sensors in real time, the method further comprises the following steps: and determining the resistance value change rate threshold value and the sensitivity threshold value through experiments and analysis of experimental data. The resistance value data is analyzed to determine the threshold value of the rate of change of the resistance value and the threshold value of the sensitivity, for example, by collecting in real time the resistance value of a batch of gas sensors from an air background until a target gas enters the gas sensors.
This embodiment is the case when the target sensor is one of the array gas sensors that responds to all of the target gases. Assuming that the array gas sensor is composed of a individual sensors, gas sensor 1, gas sensor 2, gas sensor 3, … …, gas sensor a, a single one of the a gas sensors that is judged to be capable of responding to all target gases, which may be one or more gases, for example, gas sensor 1.
Firstly, the resistance value of each gas sensor in the array gas sensor is collected in real time, the resistance value of the gas sensor 1 is extracted, and data preprocessing is carried out on the resistance value of the gas sensor 1. Then, the resistance value change rate of the gas sensor 1 in the first preset time T1 is calculated, specifically, for example, T1 is 21s, and assuming that a resistance value is set to be taken every 3s, 7 resistance values can be collected in 21s, and a resistance value change rate R1 is calculated from the 7 resistance values, which may be any method in the prior art for calculating the resistance value change rate. And then collecting the resistance value of one gas sensor 1 every 3 seconds, calculating the resistance value change rate in the second T1, namely the resistance value change rate R2 of the sensor 1 within 3s-24s, and so on, and calculating the N resistance value change rate R1, R2, … … and RN. Next, it is determined whether or not M resistance value change rates among N successive resistance value change rates of the gas sensor 1 are larger than a resistance value change rate threshold value, for example, N is 7, and M is 6. And when the M resistance value change rates are all larger than the resistance value change rate threshold value, judging whether the sensitivity of most of the array gas sensors to all the target gases in a second preset time T2 is larger than the sensitivity threshold value, and if so, taking the time point of the last resistance value acquisition for calculating the first resistance value change rate in the N continuous resistance value change rates as a gas sampling point. T1, M, N and the period of data collection may be set to other values according to specific situations, and are not limited herein.
In another embodiment, when the target sensor is a group of gas sensors formed by combining a plurality of gas sensors in the array of gas sensors that are responsive to all of the target gases, each of the gas sensors in the group of gas sensors has no response or has a response with a uniform direction to the target gas to which it is responsive. For example, the array gas sensor is composed of a gas sensors, i.e., sensor 1, gas sensor 2, gas sensor 3, … …, and gas sensor a, and first determines a group of the a gas sensors that can respond to all target gases, i.e., a group of gas sensors composed of gas sensor 1, gas sensor 2, and gas sensor 3, wherein the group of gas sensors can respond to at least P gas, M gas, and N gas, assuming that the target gases include P gas, M gas, and N gas. For example, gas sensor 1 may be responsive to P gas, gas sensor 2 may be responsive to P gas and M gas, gas sensor 3 may be responsive to M gas and N gas, or a combination of other gas sensors that respond to all target gases. Any one gas sensor in the group of gas sensors has no response or has a response with a consistent direction to the gas to which it can respond, for example, gas sensor 2 has no response to either P gas and has a response to M gas; either there is a uniform response to both P-gas and M-gas, i.e., both exhibit an increase in the rate of change of resistance value or both exhibit a decrease in the rate of change of resistance value as P-gas and M-gas enter the gas sensor.
In this case, first, the resistance value of each gas sensor in the array gas sensor is collected in real time, the resistance values of the gas sensor groups in the array gas sensor are extracted, and data preprocessing is performed on the resistance values of the gas sensor groups, which are exemplified by the gas sensor group composed of the gas sensor 1, the gas sensor 2, and the gas sensor 3 in this embodiment. Next, the resistance value change rates of the gas sensor 1, the gas sensor 2 and the gas sensor 3 in the first preset time T1 are calculated respectively, and the specific calculation method is the same as the calculation method of the target sensor being the gas sensor 1, and will not be described herein again. Then, it is determined whether M resistance value change rates of N consecutive resistance value change rates of the at least one gas sensor with respect to the target gas are greater than a resistance value change rate threshold, for example, M resistance value change rates of the gas sensor 2 are all greater than the resistance value change rate threshold. And finally, judging whether the sensitivity of most of the array gas sensors to all the target gases in a second preset time T2 is greater than a sensitivity threshold, if so, indicating that the target gases exist, and taking the time point of the last resistance value acquisition for calculating the first resistance value change rate in the N continuous resistance value change rates of the gas sensors 2 as a gas sampling point.
In the case that the target sensor is a gas sensor group formed by combining a plurality of gas sensors in the array gas sensor, at least one individual gas sensor in the array gas sensor is not required to respond to the gas to be identified, and the selection range of the individual gas sensor in the array gas sensor is increased.
It is understood that when the array gas sensor has only one gas sensor, the invention is a single gas sensing gas detection method.
FIG. 3 is a system block diagram of a gas sensor according to one embodiment of the invention. The present invention also provides a gas sensor, which may generally include an information acquisition unit 10, a calculation unit 20, a judgment unit 30, and an identification unit 40, as shown in fig. 3. The information acquisition unit 10 is used for acquiring the resistance value of each gas sensor in the array gas sensors in real time. The calculating unit 20 is configured to calculate a resistance value change rate of each gas sensor in the target sensors within a first preset time, where the resistance value change rate of the gas sensor is calculated once every time a new resistance value of the gas sensor is acquired, and the target sensor is a gas sensor group formed by one or a combination of a plurality of gas sensors in the array gas sensor, and the gas sensor group is responsive to all target gases. The determination unit 30 is configured to determine whether M resistance value change rates of N consecutive resistance value change rates of at least one gas sensor in the target sensor are greater than a resistance value change rate threshold, where N is greater than or equal to 5, M is greater than or equal to 1/2N, and M and N are integers. Alternatively, M ═ N-1 or M ═ N-2. The determining unit 30 is further configured to determine whether the sensitivity of most of the array gas sensors to all the target gases within a second preset time is greater than a sensitivity threshold. The identification unit 40 is configured to use a time point at which a last resistance value of a first resistance value change rate of the N consecutive resistance value change rates is acquired as a gas sampling point. The resistance value change rate threshold and the sensitivity threshold are determined through experiments, and the specific process is consistent with that of the previous embodiment, which is not described herein again.
The gas detection method of the invention judges the resistance value change rate of the target sensor and the sensitivity of the array gas sensor to the gas through the judging unit 30 and realizes the identification of the gas sampling point, so that the identification of the gas sampling point by the gas sensor does not depend on the stability degree of the basic resistance of the sensor, and the gas sampling point can be effectively identified under the condition that the basic resistance is unstable.
Fig. 4 is a system block diagram of a gas sensor according to another embodiment of the present invention. As shown in fig. 4, in an embodiment of the present invention, the gas sensor further includes a data processing unit 15 for performing data preprocessing on the acquired resistance values before calculating a resistance value change rate of each of the target sensors within a first preset time. For example, the resistance value may be subjected to data moving average or data normalization processing. The data preprocessing can also be any other preprocessing method in the prior art that can improve the data quality or assist the data analysis, and is not limited herein.
In one embodiment, when the target sensor is a group of gas sensors formed by combining a plurality of gas sensors in the array of gas sensors that are responsive to all of the target gases, each of the gas sensors in the group of gas sensors has no response or has a response with a uniform direction to the target gas to which it is responsive. The specific gas sampling point identification process is consistent with the foregoing embodiment, and will not be described herein.
In the case that the target sensor is a gas sensor group formed by combining a plurality of gas sensors in the array gas sensor, at least one individual gas sensor in the array gas sensor is not required to respond to the gas to be identified, and the selection range of the individual gas sensor in the array gas sensor is increased.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A gas detection method based on an array gas sensor is characterized by comprising the following steps:
acquiring the resistance value of each gas sensor in the array gas sensor in real time;
calculating the resistance value change rate of each gas sensor in a target sensor within a first preset time, wherein the resistance value change rate of the gas sensor is calculated once every time a new resistance value of the gas sensor is acquired, and the target sensor is a gas sensor group formed by one or a plurality of gas sensors which are in the array gas sensor and respond to all target gases;
judging whether M resistance value change rates in N continuous resistance value change rates of at least one gas sensor in the target sensor are larger than a resistance value change rate threshold, wherein N is larger than or equal to 5, M is larger than or equal to 1/2N, and M and N are integers;
if so, judging whether the sensitivity of most of the array gas sensors to all the target gases in a second preset time is greater than a sensitivity threshold value;
if so, taking the time point of the last resistance value acquisition for calculating the first resistance value change rate in the N continuous resistance value change rates as a gas sampling point.
2. The gas detection method according to claim 1, further comprising, before calculating a rate of change in the resistance value of each of the target sensors within a first preset time, the steps of:
and carrying out data preprocessing on the acquired resistance value of each gas sensor in the target sensors.
3. The gas detection method according to claim 1, wherein M-N-1 or M-N-2.
4. The gas detection method according to any one of claims 1 to 3, wherein when the target sensor is a gas sensor group formed by combining a plurality of gas sensors of the array of gas sensors that respond to all target gases, each of the gas sensors of the gas sensor group has a response with a uniform direction to the target gas to which it can respond.
5. The gas detection method of claim 4, further comprising, prior to acquiring the resistance value of each gas sensor of the array of gas sensors in real time, the steps of:
and determining the resistance value change rate threshold value and the sensitivity threshold value through experiments and analysis of experimental data.
6. A gas sensor, comprising:
the information acquisition unit is used for acquiring the resistance value of each gas sensor in the array gas sensors in real time;
the calculation unit is used for calculating the resistance value change rate of each gas sensor in the target sensors within a first preset time, wherein the resistance value change rate of the gas sensor is calculated once every time a new resistance value of the gas sensor is acquired, and the target sensors are gas sensor groups formed by one or a plurality of gas sensors which are in the array gas sensors and respond to all target gases;
a judging unit for judging whether M resistance value change rates of N continuous resistance value change rates of at least one gas sensor in the target sensor are larger than a resistance value change rate threshold, wherein N is larger than or equal to 5, M is larger than or equal to 1/2N, M and N are integers,
the judging unit is further used for judging whether the sensitivity of most of the array gas sensors to all the target gases in a second preset time is greater than a sensitivity threshold value; and
and the identification unit is used for taking the time point of the last resistance value acquisition for calculating the first resistance value change rate in the N continuous resistance value change rates as a gas sampling point.
7. The gas sensor of claim 6, further comprising:
and the data processing unit is used for preprocessing the acquired resistance value of each gas sensor in the target sensors before calculating the resistance value change rate of each gas sensor in the target sensors in a first preset time.
8. The gas sensor according to claim 6, wherein M-N-1 or M-N-2.
9. The gas sensor according to any one of claims 6 to 8, wherein when the target sensor is a gas sensor group formed by combining a plurality of gas sensors of the array of gas sensors that are responsive to all of the target gases, each of the gas sensors of the gas sensor group has a directionally-uniform response to the target gas to which it is responsive.
10. The gas sensor of claim 9, wherein the rate of change of resistance threshold and the sensitivity threshold are determined experimentally and by analysis of experimental data.
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| 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 |
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