Gas concentration monitoring method, system and device based on environmental monitoring

Abstract

The invention provides a gas concentration monitoring method, system and device based on environment monitoring, and relates to the technical field of gas concentration monitoring, and the method comprises the steps: obtaining the external temperature of a sensor, and the temperature corresponding relation between the internal temperature and the external temperature; based on the temperature corresponding relation, obtaining a sensor internal reference temperature corresponding to the sensor external temperature; acquiring a reading corresponding relation between the internal temperature of the sensor and the reading; and based on the obtained internal reference temperature of the sensor and the reading corresponding relation, obtaining a corrected gas concentration monitoring result. The accuracy of the measurement result of the sensor in the tunnel pipe gallery can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas concentration monitoring, and in particular to a gas concentration monitoring method, system and device based on environmental monitoring. Background Art

[0002] In tunnel and pipe gallery scenarios such as power tunnels, it is necessary to monitor the gas concentration of dangerous gases such as carbon monoxide in the tunnel and pipe gallery in real time to ensure the safety of the tunnel and pipe gallery. Taking carbon monoxide monitoring as an example, carbon monoxide sensors based on solid-state polymer electrochemical sensing technology are currently commonly used in tunnel and pipe gallery to monitor carbon monoxide concentration. This sensor achieves the purpose of monitoring by causing current changes through external lines through electrochemical reactions. It has the advantages of long life, repeatability, good linearity and consistency.

[0003] In order to ensure the waterproofness of the sensor and avoid the impact of the humid environment in the tunnel corridor on the life of the sensor, it is necessary to add a waterproof and breathable membrane to the sensor. However, after adding the waterproof and breathable membrane, the temperature difference between the internal temperature of the sensor and the external ambient temperature will increase, thereby affecting the measurement accuracy of the sensor. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a gas concentration monitoring method, system and device based on environmental monitoring to improve the accuracy of sensor measurement results in a tunnel corridor.

[0005] In order to achieve the above object, according to some embodiments, a first aspect of the present invention provides a gas concentration monitoring method based on environmental monitoring, comprising:

[0006] Obtain the external temperature of the sensor and the temperature correspondence between the internal temperature and the external temperature;

[0007] Based on the temperature correspondence, obtaining a sensor internal reference temperature corresponding to the sensor external temperature;

[0008] Obtain the reading correspondence between the internal temperature of the sensor and the reading;

[0009] Based on the obtained internal reference temperature of the sensor and the corresponding relationship of the readings, a corrected gas concentration monitoring result is obtained.

[0010] Preferably, the temperature correspondence is obtained by obtaining the internal temperature of the sensor at different external temperatures under normal temperature to obtain a temperature fitting curve between the external temperature and the internal temperature; in high and low temperature environments, further adjusting the coefficient of the temperature fitting curve to obtain the temperature correspondence between the internal temperature and the external temperature.

[0011] Preferably, the reading correspondence is acquired by acquiring corresponding readings of the sensor at different temperatures under different gas concentrations, and obtaining a reading correspondence between the internal temperature of the sensor and the readings under different gas concentrations.

[0012] Preferably, the reading correspondence is obtained by obtaining corresponding readings of the sensor at different temperatures under a set gas concentration to obtain a reading fitting curve under the gas concentration; using corresponding readings of the sensor at different temperatures under another set gas concentration, adjusting the coefficient of the reading fitting curve, and obtaining the reading correspondence between the internal temperature of the sensor and the reading.

[0013] Preferably, based on the obtained internal reference temperature of the sensor and the corresponding relationship between the readings, a corrected gas concentration monitoring result is obtained, including: based on the obtained internal reference temperature of the sensor and the corresponding relationship between the readings, a corrected reading at a standard temperature is obtained as the corrected gas concentration monitoring result.

[0014] A second aspect of the present invention provides a gas concentration monitoring system based on environmental monitoring, comprising:

[0015] A temperature correspondence acquisition module is configured to acquire the external temperature of the sensor and the temperature correspondence between the internal temperature and the external temperature;

[0016] An internal reference temperature acquisition module is configured to obtain a sensor internal reference temperature corresponding to the sensor external temperature based on the temperature correspondence;

[0017] A reading correspondence acquisition module is used to acquire a reading correspondence between the internal temperature of the sensor and the reading;

[0018] The gas concentration monitoring result acquisition module is configured to obtain a corrected gas concentration monitoring result based on the obtained internal reference temperature of the sensor and the reading correspondence.

[0019] According to a third aspect of the present invention, an electronic device is provided, comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to complete the steps of the above-mentioned gas concentration monitoring method based on environmental monitoring.

[0020] According to a fourth aspect of the present invention, a computer-readable storage medium is provided for storing computer instructions, which, when executed by a processor, complete the steps of the above-mentioned gas concentration monitoring method based on environmental monitoring.

[0021] According to a fifth aspect of the present invention, a computer program product is provided, comprising a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned gas concentration monitoring method based on environmental monitoring.

[0022] A sixth aspect of the present invention provides a gas concentration monitoring device based on environmental monitoring, which is applied to gas concentration monitoring in a tunnel gallery, and includes a gas sensor, a temperature sensor, and a host computer;

[0023] The gas sensor is configured to obtain the gas concentration in the tunnel gallery;

[0024] The temperature sensor is configured to obtain the ambient temperature in the tunnel corridor;

[0025] The host computer is connected to the gas sensor and the temperature sensor, and is configured to control the gas sensor and the temperature sensor to simultaneously collect the gas concentration and ambient temperature in the tunnel corridor, obtain the internal reference temperature of the gas sensor based on the pre-stored temperature correspondence, and obtain the gas concentration at a standard temperature corresponding to the acquired gas concentration and the internal reference temperature based on the pre-stored reading correspondence as the gas concentration monitoring result.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention provides a gas concentration monitoring method, system and device based on environmental monitoring. By acquiring the temperature correspondence between the inside and outside of a gas sensor, the internal temperature of the sensor is inferred according to the external ambient temperature, thereby reducing the error of the measurement result caused by the temperature difference between the inside and outside of the sensor; by acquiring the reading correspondence between the sensor temperature and the reading, the reading at the current internal temperature of the sensor is corresponded to the standard temperature (25°C), thereby further improving the monitoring accuracy of the sensor.

[0028] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] Figure 1 This is a schematic diagram of the curves of the original values ​​and calibration results collected by the sensor at different temperatures for 200 ppm standard gas in the method of Example 1 of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] Embodiment 1

[0033] Embodiment 1 of the present invention provides a method for monitoring gas concentration based on environmental monitoring, comprising:

[0034] S1, obtaining the external temperature of the sensor, and the temperature correspondence between the internal temperature and the external temperature;

[0035] S2. Based on the temperature correspondence, obtaining a reference temperature inside the sensor corresponding to the external temperature of the sensor;

[0036] S3, obtaining the corresponding relationship between the internal temperature of the sensor and the reading;

[0037] S4. Based on the obtained internal reference temperature of the sensor and the corresponding relationship of the readings, a corrected gas concentration monitoring result is obtained.

[0038] In order to ensure the service life of the gas sensor in the tunnel corridor, it is usually necessary to set a waterproof and breathable membrane on the outside of the sensor to isolate the sensor from the external high humidity environment. However, in addition to isolating water vapor, the waterproof and breathable membrane will also isolate the temperature inside and outside the sensor, increasing the temperature difference between the inside and outside of the sensor. Taking the carbon monoxide gas sensor as an example, the temperature difference between the inside and outside of the carbon monoxide gas sensor will affect the chemical reaction inside the sensor and the performance of the electronic components, thereby affecting the measurement accuracy of the sensor. In this regard, this embodiment utilizes the difference between the existing tunnel corridor ambient temperature and the temperature change inside the sensor, and the characteristic curve of the electrochemical gas concentration sensor itself, and through multiple correction strategies, corrects the existing carbon monoxide gas detection results to improve the accuracy of carbon monoxide detection data.

[0039] In step S1, the sensor external temperature refers to the temperature of the environment in which the carbon monoxide sensor set in the tunnel corridor for monitoring the carbon monoxide gas concentration is located, which can be obtained by a temperature sensor set in the tunnel corridor (hereinafter referred to as the first temperature sensor). The first temperature sensor is preferably set together with the carbon monoxide sensor to improve the accuracy of temperature measurement.

[0040] The temperature correspondence between the internal temperature and the external temperature of the carbon monoxide sensor is obtained through experiments. The experiment calculates the function change curve of the internal temperature of the carbon monoxide sensor and the ambient temperature in unit time, and then calculates a more accurate sensor working temperature according to the ambient temperature of the underground pipe gallery. First, a temperature sensor is placed in the carbon monoxide sensor, which is called the second temperature sensor. After the carbon monoxide sensor is reassembled, the sensor is placed in the experimental box. The experimental box also has a temperature sensor that can collect the temperature in the box, which is called the third temperature sensor. The ambient temperature in the experimental box (the reading of the third temperature sensor) and the internal temperature of the gas sensor (the reading of the second temperature sensor) are collected every minute. Under normal temperature conditions, using the natural temperature change conditions every day, after collecting for a few days, the data is preliminarily curve fitted. Then the carbon monoxide gas sensor is placed in a high and low temperature experimental box to further verify the accuracy of the fitting curve under low temperature conditions (such as -25°C) and high temperature conditions (such as 60°C), and fine-tune the coefficient of the curve.

[0041] In this embodiment, the fitting curve is fitted by a quadratic equation, and the fitting function is:

[0042] Y=aT 2 +bT+c

[0043] Among them, T represents the ambient temperature, Y represents the fitting value, and a, b, and c are fitting coefficients. In order to further improve the fitting accuracy, considering the differences in fitting curves in different temperature ranges, the ambient temperature is divided into two ranges below 4°C and above 4°C, and the corresponding fitting curves in each range are fitted, that is, the fitting coefficients a, b, and c in each range are different.

[0044] In step S2, based on the fitting curve obtained in S1, that is, the temperature correspondence between the internal temperature and the external temperature, the external temperature measured by the first temperature sensor is substituted to obtain the corresponding internal temperature as the internal reference temperature of the sensor at this time.

[0045] In step S3, considering that there is also a functional relationship between the reading of the carbon monoxide sensor and the temperature of its working environment, the corresponding relationship between the internal temperature of the sensor and the reading is further obtained to correct the reading.

[0046] The corresponding readings of the carbon monoxide sensor at different temperatures under different gas concentrations are obtained, and the corresponding reading relationship between the internal temperature of the carbon monoxide sensor and the reading under different gas concentrations is obtained, so as to be used for subsequent fitting.

[0047] Furthermore, under different gas concentrations, the ambient temperature to which the sensor is exposed and the curve change rules of the carbon monoxide sensor reading are basically the same, and the same function curve can be used to describe the fitting. Through the change relationship between the ambient temperature and the sensor reading under the current gas concentration, the change relationship between the ambient temperature and the sensor reading under any gas concentration can be inferred. According to the functional characteristics of the ambient temperature and the carbon monoxide sensor reading, the sensor readings at various temperatures are uniformly fitted to the measured values ​​at a suitable temperature to achieve the uniformity and accuracy of the compensated data at various temperatures.

[0048] Since carbon monoxide sensors and other gas sensors are calibrated with 200ppm standard gas at 25℃ when they leave the factory, it is assumed that the values ​​measured by the gas sensor at 25℃ are accurate. Therefore, if the gas concentration measured at temperature A is X1, the corresponding gas concentration Y1 at 25℃ can be found on the fitting curve, and the gas concentration Y1 is the final corrected gas concentration value.

[0049] Based on this, the reading correspondence between the internal temperature of the carbon monoxide sensor and the reading can be obtained by conducting experiments on the carbon monoxide sensor without shell protection. In this embodiment, the gas sensor without shell protection is first placed in a high and low temperature test box, and the working temperature of the exposed sensor can be equivalent to the ambient temperature; then, a carbon monoxide standard gas with a concentration of 200ppm is used to measure the values ​​measured by the carbon monoxide sensor at different temperatures. After preliminary data fitting of the temperature and sensor values, the fitting effect of the fitting curve is verified with a carbon monoxide standard gas with a concentration of 100ppm, and the curve coefficient is fine-tuned to obtain the final fitting curve, which is the reading correspondence between the internal temperature of the carbon monoxide sensor and the reading.

[0050] In this embodiment, the reading correspondence between the internal temperature of the carbon monoxide sensor and the reading is calculated using the following formula:

[0051]

[0052] Among them, T1 is the internal temperature of the carbon monoxide sensor at the current moment, T1 ′ is the internal temperature of the carbon monoxide sensor calculated at the last moment, X is the currently measured ambient temperature, d and e are fitting coefficients, and t is the interval between two readings.

[0053] Similarly, in order to further improve the calculation accuracy, the ambient temperature is divided into three intervals: below 0°C, 0-40°C, and above 40°C. The corresponding fitting curve is obtained in each interval by fitting, that is, the fitting coefficients d and e in each interval are different.

[0054] In step S4, based on the internal reference temperature of the sensor obtained in step S2 and the corresponding relationship of the readings obtained in step S3, a correction reading at a standard temperature (25°C) is obtained as a corrected gas concentration monitoring result.

[0055] like Figure 1 As shown, under standard atmospheric pressure, the temperature range is between -20°C and 50°C, and for carbon monoxide with a standard gas concentration of 200ppm, the readings obtained after correction using the method provided in this embodiment are between 170ppm and 220ppm. It can be seen from the figure that there is a significant improvement compared to the original measurement value, and the accuracy error is within ±3%FS.

[0056] The method provided in this embodiment greatly improves the monitoring accuracy of gases such as carbon monoxide in tunnel corridors, can accurately obtain gas concentrations under different environmental conditions, and the algorithm deployment difficulty is low. For scenarios where monitoring accuracy requirements are not high, sensors of the same type and specifications can be fitted using the same experimental data, which can achieve rapid and large-scale deployment.

[0057] Embodiment 2

[0058] This embodiment provides a gas concentration monitoring system based on environmental monitoring, including:

[0059] A temperature correspondence acquisition module is configured to acquire the external temperature of the sensor and the temperature correspondence between the internal temperature and the external temperature;

[0060] An internal reference temperature acquisition module is configured to obtain a sensor internal reference temperature corresponding to the sensor external temperature based on the temperature correspondence;

[0061] A reading correspondence acquisition module is used to acquire a reading correspondence between the internal temperature of the sensor and the reading;

[0062] The gas concentration monitoring result acquisition module is configured to obtain a corrected gas concentration monitoring result based on the obtained internal reference temperature of the sensor and the reading correspondence.

[0063] It should be noted here that the various modules in this embodiment correspond one-to-one to the steps of the method in Example 1, and the specific implementation process is the same, which will not be repeated here.

[0064] Embodiment 3

[0065] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to complete the steps of the method in the first embodiment.

[0066] Embodiment 4

[0067] This embodiment provides a computer-readable storage medium for storing computer instructions. When the computer instructions are executed by a processor, the steps of the method in the first embodiment are completed.

[0068] Embodiment 5

[0069] This embodiment provides a computer program product, including a computer program / instruction, which implements the steps of the method in Embodiment 1 when executed by a processor.

[0070] Embodiment 6

[0071] This embodiment provides a gas concentration monitoring device based on environmental monitoring, which is applied to gas concentration monitoring in a tunnel corridor, and includes a gas sensor, a temperature sensor, and a host computer;

[0072] The gas sensor is configured to obtain the gas concentration in the tunnel gallery;

[0073] The temperature sensor is configured to obtain the ambient temperature in the tunnel corridor;

[0074] The host computer is connected to the gas sensor and the temperature sensor, and is configured to control the gas sensor and the temperature sensor to simultaneously collect the gas concentration and ambient temperature in the tunnel corridor, obtain the internal reference temperature of the gas sensor based on the pre-stored temperature correspondence, and obtain the gas concentration at a standard temperature corresponding to the acquired gas concentration and the internal reference temperature based on the pre-stored reading correspondence as the gas concentration monitoring result.

[0075] The working principles of the gas sensor, temperature sensor, and host computer in this embodiment are the same as those described in the first embodiment, and will not be repeated here.

[0076] Multiple gas sensors can be deployed as needed in the tunnel corridor, and adjacent gas sensors can be bound to temperature sensors or environmental acquisition terminals to achieve coordinated acquisition of gas concentration and temperature, and to achieve correction of gas concentration based on pre-stored correspondence. The correction of gas concentration is performed in the software platform of the host computer. The platform stores a large amount of original measurement data. Through the original measurement data, it can also realize further correction and adjustment of the pre-stored temperature correspondence and reading correspondence, thereby further improving the measurement accuracy.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas concentration monitoring method based on environmental monitoring, characterized in that: include: Obtain the external temperature of the sensor and the temperature correspondence between the internal temperature and the external temperature; Based on the temperature correspondence, obtaining a sensor internal reference temperature corresponding to the sensor external temperature; Obtain the reading correspondence between the internal temperature of the sensor and the reading; Based on the obtained internal reference temperature of the sensor and the corresponding relationship of the readings, a corrected gas concentration monitoring result is obtained.

2. A method for monitoring gas concentration based on environmental monitoring as claimed in claim 1, characterized in that: The temperature correspondence relationship is obtained by obtaining the internal temperature of the sensor under different external temperatures under normal temperature environment to obtain a temperature fitting curve between the external temperature and the internal temperature; in high temperature and low temperature environment, further adjusting the coefficient of the temperature fitting curve to obtain the temperature correspondence relationship between the internal temperature and the external temperature.

3. A method for monitoring gas concentration based on environmental monitoring as claimed in claim 1, characterized in that: The reading correspondence relationship is obtained by obtaining corresponding readings of the sensor at different temperatures under different gas concentrations, and obtaining a reading correspondence relationship between the internal temperature of the sensor and the readings under different gas concentrations.

4. A method for monitoring gas concentration based on environmental monitoring as claimed in claim 1, characterized in that: The reading correspondence relationship is obtained by obtaining corresponding readings of the sensor at different temperatures under a set gas concentration to obtain a reading fitting curve under the gas concentration; using corresponding readings of the sensor at different temperatures under another set gas concentration, adjusting the coefficient of the reading fitting curve, and obtaining a reading correspondence relationship between the internal temperature of the sensor and the reading.

5. A method for monitoring gas concentration based on environmental monitoring as claimed in claim 1, characterized in that: Based on the obtained internal reference temperature of the sensor and the reading correspondence, a corrected gas concentration monitoring result is obtained, including: based on the obtained internal reference temperature of the sensor and the reading correspondence, a corrected reading at a standard temperature is obtained as the corrected gas concentration monitoring result.

6. A gas concentration monitoring system based on environmental monitoring, characterized in that: include: A temperature correspondence acquisition module is configured to acquire the external temperature of the sensor and the temperature correspondence between the internal temperature and the external temperature; An internal reference temperature acquisition module is configured to obtain a sensor internal reference temperature corresponding to the sensor external temperature based on the temperature correspondence; A reading correspondence acquisition module is used to acquire a reading correspondence between the internal temperature of the sensor and the reading; The gas concentration monitoring result acquisition module is configured to obtain a corrected gas concentration monitoring result based on the obtained internal reference temperature of the sensor and the reading correspondence.

7. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to complete the steps of the method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: Used to store computer instructions, which, when executed by a processor, complete the steps of the method according to any one of claims 1 to 5.

9. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A gas concentration monitoring device based on environmental monitoring, characterized in that: Including gas sensor, temperature sensor, host computer; The gas sensor is configured to obtain the gas concentration in the tunnel gallery; The temperature sensor is configured to obtain the ambient temperature in the tunnel corridor; The host computer is connected to the gas sensor and the temperature sensor, and is configured to control the gas sensor and the temperature sensor to simultaneously collect the gas concentration and ambient temperature in the tunnel corridor, obtain the internal reference temperature of the gas sensor based on the pre-stored temperature correspondence, and obtain the gas concentration at a standard temperature corresponding to the acquired gas concentration and the internal reference temperature based on the pre-stored reading correspondence as the gas concentration monitoring result.

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