A method for rapid and stable reading of gaseous pollutant control inspection data

Abstract

This invention relates to a method for rapidly and stably reading data of gaseous pollutant control inspection, belonging to the field of atmospheric environmental monitoring quality control. The method mainly includes: introducing a specific concentration of gas into a gaseous pollutant monitoring device and recording monitoring readings every first cycle; setting a time sliding window, the time sliding window including a preset number of times corresponding to the monitoring readings; calculating the standard deviation of the monitoring readings corresponding to each time point in the time sliding window; if the standard deviation is greater than or equal to a preset threshold, the time sliding window is moved forward by at least one first cycle, and the standard deviation is recalculated; otherwise, the mean of the monitoring readings corresponding to each time point in the time sliding window is obtained; and the mean is used as the stable reading for the quality control inspection.

Description

Technical Field

[0001] This invention belongs to the field of atmospheric environmental monitoring and quality control, and specifically relates to a method for rapid and stable reading of gaseous pollutant control and inspection data. Background Technology

[0002] Atmospheric environmental monitoring targets various pollutants in the atmosphere (SO2, NO2, CO, O3, PM2.5, PM10, etc.). Continuous real-time monitoring is achieved through automated monitoring equipment, providing crucial data support for environmental quality assessment, public health protection, ecosystem maintenance, and environmental management decision-making. Monitoring equipment used for continuous monitoring requires rigorous maintenance and quality management to ensure the accuracy and reliability of the acquired data. For monitoring equipment of gaseous pollutants (SO2, NO2, CO, O3), zero-point checks and span checks are also necessary to calibrate and correct for deviations in monitoring results caused by long-term operation.

[0003] Zero-point checking determines the instrument's measured value without any input signal. This is typically done by using a zero-gas generator to introduce zero gas into the monitoring device, and recording the reading as the zero-point deviation once it stabilizes. Span checking involves introducing a standard gas at 80% of the instrument's full scale into the monitoring instrument using a gas dynamic calibrator. After the reading stabilizes, it is recorded as the response value, and the correlation coefficient and slope are calculated to ensure they meet the equipment's standard requirements.

[0004] Traditional methods for determining reading stability involve estimating a relatively long period to ensure stability and then using the monitoring equipment reading at that time point as the response value. However, this approach has significant shortcomings. Firstly, the reading time is fixed, failing to account for variations in equipment and weather conditions, potentially leading to fluctuations in readings from some devices at that specific time. Secondly, if the reading is taken at a point relatively long after the start of the inspection, it may result in excessive consumption of standard gas, leading to unnecessary waste.

[0005] In summary, existing methods for determining stability suffer from poor determinism and high gas consumption. Summary of the Invention

[0006] In view of the above analysis, in order to solve the above problems, embodiments of the present invention provide a method for rapid and stable reading of gaseous pollutant control inspection data, including the following steps:

[0007] A specific concentration of gas is introduced into a gaseous pollutant monitoring device, and the monitoring reading is recorded every first cycle.

[0008] A time sliding window is set, wherein the time sliding window includes a preset number of times corresponding to the monitoring readings;

[0009] Calculate the standard deviation of the monitoring readings at each moment in the time sliding window;

[0010] If the standard deviation is greater than or equal to a preset threshold, the time sliding window is moved forward by at least one first cycle, and the standard deviation is recalculated; otherwise, the mean of the monitoring readings corresponding to each moment in the time sliding window is obtained.

[0011] The mean value is used as the stable reading for the quality control inspection.

[0012] In some embodiments, the quality control check includes a zero-point check, where the specific concentration gas is zero gas.

[0013] In some embodiments, if SO2, NO2, or O3 is used as a gaseous pollutant monitoring target, the set threshold is 1 ppb.

[0014] If CO is used as the target for monitoring gaseous pollutants, then the set threshold is 1 ppm.

[0015] In some embodiments, the quality control check includes a span check, wherein the concentration of the specific concentration gas is between 70% and 100% of the full scale of the gaseous pollutant monitoring device.

[0016] In some embodiments, the set threshold is 0.5% of the span checkpoint, and the span monitoring point is 70% to 100% of the full scale of the gaseous pollutant monitoring device.

[0017] In some embodiments, the length of the first cycle is between 0.5 and 5 minutes.

[0018] In some embodiments, the preset quantity is between 3 and 10.

[0019] In some embodiments, the length of the first period is 1 minute, the preset number is 5, and the standard deviation of the monitoring readings corresponding to each moment in the time sliding window is expressed as:

[0020]

[0021] Where sd(x) t ) represents the standard deviation of the monitoring readings within the time sliding window at time t, x t This represents the monitoring reading at time t. This represents the average of the monitoring readings at each point in the time sliding window.

[0022] In some embodiments, after obtaining the stable reading, the method further includes:

[0023] If the stable reading exceeds the preset range, the gaseous pollutant monitoring equipment shall be maintained.

[0024] The above embodiments of the present invention have at least the following beneficial effects:

[0025] The method for rapid and stable reading of gaseous pollutant control inspection data provided in this invention utilizes the standard deviation of samples over a continuous time period to propose a simple and efficient method for judging data stationarity. This effectively overcomes the uncertainty caused by the inability to determine data stationarity in existing technologies and the increased consumption of standard gas. Compared to methods that estimate a redundant time frame for reading inspection values, this invention uses a sliding window approach, selecting a larger number of sample points and more accurately determining the data stationarity state. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.

[0027] Figure 1 This is a schematic flowchart of a method for rapidly and stably reading data of gaseous pollutant control inspection provided in an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. It should be noted that, unless otherwise specified, the implementation methods and features in the implementation methods in this disclosure can be combined, separated, interchanged, and / or rearranged. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0030] The present disclosure will be described below through several specific embodiments. To keep the following description of the embodiments of the invention clear and concise, detailed descriptions of known functions and components are omitted. Please refer to... Figure 1 This invention provides a method for rapidly and stably reading data from gaseous pollutant control inspections, comprising the following steps:

[0031] A specific concentration of gas is introduced into a gaseous pollutant monitoring device, and the monitoring reading is recorded every first cycle.

[0032] A time sliding window is set, wherein the time sliding window includes a preset number of times corresponding to the monitoring readings;

[0033] Calculate the standard deviation of the monitoring readings at each moment in the time sliding window;

[0034] If the standard deviation is greater than or equal to a preset threshold, the time sliding window is moved forward by at least one first cycle, and the standard deviation is recalculated; otherwise, the mean of the monitoring readings corresponding to each moment in the time sliding window is obtained.

[0035] The mean value is used as the stable reading for the quality control inspection.

[0036] In some embodiments, the quality control check includes a zero-point check, where the specific concentration gas is referred to as zero gas. The zero-point check determines the instrument's monitored value when no measurement signal is input. Typically, a zero-point generator is used to introduce zero gas into the monitoring device, and the reading is recorded as the zero-point deviation once it stabilizes. The purpose is to confirm whether the device's reading at zero concentration (i.e., without the target gas) is close to zero and to detect whether the device experiences zero-point drift (zero-point offset), ensuring the accuracy of the measurement results. Generally, it is necessary to wait for the device to stabilize after introducing zero gas before recording the device reading. However, the waiting time in traditional methods is uncertain, and it is difficult to determine whether the device has stabilized, thus the obtained stabilized reading is also inaccurate.

[0037] The method described above can be applied to zero-point checks of gaseous pollutant monitoring equipment. Compared to methods that estimate a redundant time frame for reading check values, this invention utilizes a sliding window approach, selecting a larger number of sample points and more accurately determining the data stability state. This effectively overcomes the uncertainty caused by the inability to determine data stability in existing technologies and the increased consumption of standard gases.

[0038] In some embodiments, if SO2, NO2, or O3 is used as a gaseous pollutant monitoring target, the set threshold is 1 ppb.

[0039] If CO is used as the target for monitoring gaseous pollutants, then the set threshold is 1 ppm.

[0040] In some embodiments, the quality control check includes a span check, wherein the concentration of the specific concentration gas is between 70% and 100% of the full scale of the gaseous pollutant monitoring device, for example, 80% in one embodiment of the invention.

[0041] The method described above can be applied to the span inspection of gaseous pollutant monitoring equipment. Compared to methods that estimate a redundant time frame for reading inspection values, this invention utilizes a sliding window approach, selecting a larger number of sample points and more accurately determining the data stationary state. This effectively overcomes the uncertainty caused by the inability to determine data stationaryness in existing technologies and the increased consumption of standard gases.

[0042] In some embodiments, the set threshold is 0.5% of the span checkpoint, and the span monitoring point is 70% to 100% of the full scale of the gaseous pollutant monitoring device; in one embodiment of the present invention, it is, for example, 80%. The span checkpoint corresponds to the concentration of the gas to be introduced, and it is necessary to check whether the two are consistent.

[0043] For example, in some embodiments of span inspection, let C be the full-scale value of the equipment. For instance, the range of monitoring equipment for SO2, NO2, and O3 is 500 ppb, and the range of CO monitoring equipment is 50 ppm or 20 ppm. Then, the preset threshold c is c = 0.005·0.8·C, which is used to determine whether the standard deviation is less than 0.5% of the span point.

[0044] Preferably, for zero-point checks or span checks, some embodiments of the present invention further include the following before introducing zero gas or standard gas:

[0045] Check if the zero gas generator is working properly and if there are any leaks in the gas circuit, whether the standard gas is in an abnormal state, and whether the flow controller of the dynamic calibrator is working properly.

[0046] Zero gas generated by a zero gas generator is introduced into the gaseous pollutant monitoring equipment, or a standard gas with a concentration of 80% of the monitoring equipment's range is introduced into the gaseous pollutant monitoring equipment using a dynamic calibrator.

[0047] In some embodiments, the length of the first cycle is between 0.5 and 5 minutes, and in one embodiment of the present invention, it is, for example, 1 minute.

[0048] In some embodiments, the preset number is between 3 and 10, and in one embodiment of the present invention it is, for example, 5.

[0049] In some embodiments, the length of the first period is 1 minute, and the preset number is 5. Then, the monitoring readings corresponding to each time point in the time sliding window at time t include:

[0050] x t ,x t-1 ,x t-2 ,x t-3 ,x t-4 .

[0051] The standard deviation of the monitoring readings at each moment in the time sliding window is expressed as follows:

[0052]

[0053] Where sd(x) t ) represents the standard deviation of the monitoring readings within the time sliding window at time t, x t This represents the monitoring reading at time t. This represents the average of the monitoring readings at each point in the time sliding window.

[0054] If sd(x) tIf sd(x) is greater than or equal to a preset threshold, then let t = t + 1, and repeat the calculation of the standard deviation within the time sliding window until sd(x) is greater than or equal to the preset threshold. t If the reading is less than the preset threshold, it means the reading has stabilized and subsequent operations can proceed.

[0055] In some embodiments, after obtaining the stable reading, the method further includes:

[0056] If the stable reading exceeds the preset range, the gaseous pollutant monitoring equipment shall be maintained.

[0057] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0058] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0059] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Anything within the spirit and principles of the present invention is protected.

[0060] Instruction Manual J2YXZSP240850CN

[0061] Any modifications, equivalent substitutions, improvements, etc., made should be included within the scope of protection of this invention.

Claims

1. A method for rapid and stable reading of data from the control and inspection of gaseous pollutants, characterized in that, Includes the following steps: A specific concentration of gas is introduced into a gaseous pollutant monitoring device, and the monitoring reading is recorded every first cycle. A time sliding window is set for a certain moment, and the time sliding window includes a preset number of moments corresponding to the monitoring readings, including the certain moment. Calculate the standard deviation of the monitoring readings at each moment in the time sliding window; The length of the first cycle is 1 minute, the preset quantity is 5, and the standard deviation of the monitoring readings corresponding to each moment in the time sliding window is expressed as follows: ； in This represents the standard deviation of the monitoring readings within the time sliding window at time t (t≥5). This represents the monitoring reading at time ti. This represents the average of the monitoring readings at each point in the time sliding window. ; If the standard deviation is greater than or equal to a preset threshold, the time sliding window is moved forward by at least one first cycle, and the calculation of the standard deviation is repeated; otherwise, the mean of the monitoring readings corresponding to each moment in the time sliding window is obtained. The mean value is used as the stable reading for the quality control inspection.

2. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1, characterized in that: The quality control inspection includes a zero-point inspection, where the specific concentration gas is zero gas.

3. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 2, characterized in that: If SO2, NO2, or O3 are used as the monitoring targets for gaseous pollutants, then the preset threshold is 1 ppb; If CO is used as the target for monitoring gaseous pollutants, then the preset threshold is 1 ppm.

4. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1, characterized in that: The quality control inspection includes a span inspection, wherein the concentration of the specific concentration gas is between 70% and 100% of the full scale of the gaseous pollutant monitoring equipment.

5. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 4, characterized in that: The preset threshold is 0.5% of the span checkpoint, and the span checkpoint is 70% to 100% of the full scale of the gaseous pollutant monitoring equipment.

6. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1, characterized in that: The length of the first cycle is between 0.5 and 5 minutes.

7. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1, characterized in that: The preset quantity is between 3 and 10.

8. The method for rapid and stable reading of gaseous pollutant control inspection data according to claim 1, characterized in that: After obtaining the stable reading, the method further includes: If the stable reading exceeds the preset range, the gaseous pollutant monitoring equipment shall be maintained.

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