Method and system for detecting volatile organic compounds

Abstract

This invention relates to the field of environmental monitoring technology, and particularly to a method and system for detecting and processing volatile organic compounds (VOCs). The method includes: establishing a training dataset; training a relational model based on the training dataset; obtaining the distribution range of the relative molecular mass of each VOC in the test gas, the gas parameters of the test gas, and its density; determining the concentration range of VOCs in the test gas under standard parameters based on the distribution range, density, and relational model; determining the actual gas inhalation volume based on the standard parameters, gas parameters, concentration range, and detection range; correcting the carrier gas velocity based on the actual gas inhalation volume; and detecting and outputting the detection results. By dynamically matching the concentration range with the instrument's optimal operating range, the actual gas inhalation volume is automatically calculated, avoiding signal distortion caused by exceeding concentration limits, thereby increasing the accuracy of the detection results.

Description

Technical Field

[0001] This invention relates to the field of material detection technology, and in particular to a method and system for detecting and processing volatile organic compounds. Background Technology

[0002] Volatile organic compounds (VOCs) are a key indicator for monitoring air pollution and indoor air quality. Their accurate detection is of great significance for environmental protection, industrial production safety and human health.

[0003] In existing detection technologies, traditional methods often suffer from detection deviations due to fluctuations in environmental parameters. On the one hand, changes in gas pressure and temperature significantly affect the density and concentration characterization of VOCs, and most detection systems lack dynamic correction mechanisms, making it difficult to accurately convert detection values ​​under actual operating conditions into concentrations under standard conditions. On the other hand, detection instruments have specific optimal operating concentration ranges. When the concentration of the gas to be measured exceeds this range, response saturation or weak signals are prone to occur, requiring adjustments to the gas intake volume to adapt to instrument performance. However, existing technologies lack quantitative calculation methods based on concentration ranges and gas parameters, leading to significant arbitrariness in intake volume adjustments. Furthermore, carrier gas velocity, a key parameter affecting the stability of the detection system, is often used as a fixed value in traditional detection methods without being linked to the actual gas intake volume for correction, making it susceptible to detection errors due to fluctuations in sample transport efficiency.

[0004] The aforementioned problems make it difficult for existing VOCs detection methods to meet the requirements of high-precision monitoring in terms of accuracy. There is an urgent need to establish a systematic solution that integrates parameter correction, concentration range adaptation, and dynamic carrier gas regulation. Summary of the Invention

[0005] The purpose of this invention is to provide a method and system for detecting and processing volatile organic compounds (VOCs) to solve the problem that the accuracy of VOCs detection in the prior art is insufficient to meet the requirements of high-precision monitoring.

[0006] This invention provides a method for detecting and processing volatile organic compounds, comprising:

[0007] The density of a standard gas under standard parameters is detected, and the concentration of organic matter in the standard gas, its corresponding average relative molecular mass, and density are stored in the training dataset.

[0008] Train a relational model based on the training dataset;

[0009] To obtain the distribution range of the relative molecular mass of each volatile organic compound in the gas to be tested, the gas parameters of the gas to be tested, and the density;

[0010] The concentration range of volatile organic compounds in the gas to be tested under the standard parameters is determined based on the distribution range, density, and relationship model.

[0011] The actual gas inhalation volume is determined based on the standard parameters, the gas parameters, the concentration range, and the detection range.

[0012] The carrier gas velocity is adjusted based on the actual gas intake volume.

[0013] The concentration of volatile organic compounds in the gas to be tested is detected, and the test results are output.

[0014] In a preferred technical solution for the detection and treatment method of volatile organic compounds, the standard parameters are all preset values ​​for the gas parameters of the standard gas.

[0015] The gas parameters include pressure and temperature.

[0016] As a preferred technical solution for the detection and processing method of volatile organic compounds, the relationship model is established by taking the correspondence between the average relative molecular mass and density of the standard gas and the concentration of organic compounds in the standard gas as input data. If the average relative molecular mass and density of the gas to be tested are input, the concentration of organic compounds in the gas to be tested under standard parameters is output.

[0017] As a preferred technical solution for the detection and treatment method of volatile organic compounds, the concentration range of volatile organic compounds in the gas to be tested under the standard parameters is determined based on the distribution range, density, and the relationship model, including:

[0018] To obtain the distribution range of the relative molecular mass of each volatile organic compound in the gas to be tested, the gas parameters of the gas to be tested, and the density;

[0019] Based on the gas parameters and standard parameters, the density is corrected to the density of the gas to be tested under the standard parameters;

[0020] The union of the distribution ranges of each volatile organic compound is taken as the distribution range of the volatile organic compounds in the gas to be tested.

[0021] By inputting the endpoints of the distribution range and the density of the gas to be tested under standard parameters into the relationship model, the concentration range of volatile organic compounds in the gas to be tested under the standard parameters is obtained.

[0022] As a preferred technical solution for the detection and treatment method of volatile organic compounds, the actual gas inhalation volume is determined based on the standard parameters, the gas parameters, the concentration range, and the detection range, including:

[0023] The gas inhalation volume under the standard parameters is determined based on the concentration range and the detection range.

[0024] The actual gas inhalation volume is determined based on the standard parameters, the gas parameters, and the gas inhalation volume of the gas to be tested under the standard parameters.

[0025] The detection range is the range of the amount of substance that the detection instrument can detect at the concentration of the substance.

[0026] As a preferred technical solution for the detection and treatment method of volatile organic compounds, determining the gas inhalation volume under the standard parameters based on the concentration range and the detection range includes:

[0027] Obtain the maximum and minimum values ​​within the concentration range;

[0028] The first gas inhalation volume range is determined based on the maximum value of the concentration range and the detection range;

[0029] The second gas inhalation volume range is determined based on the minimum value of the concentration range and the detection range.

[0030] The intersection of the first gas inhalation volume range and the second gas inhalation volume range is taken as the gas inhalation volume range of the gas to be tested under standard parameters.

[0031] The gas intake volume of the test gas under standard parameters is determined based on the gas intake volume range.

[0032] As a preferred technical solution for the detection and treatment method of volatile organic compounds, the standard gas is a mixture of volatile organic compounds with air containing known average relative molecular mass, density and concentration.

[0033] The standard parameters are preset gas parameter conditions.

[0034] As a preferred technical solution for the detection and treatment method of volatile organic compounds, the gas parameters are the pressure and temperature at which the concentration of volatile organic compounds is detected.

[0035] As a preferred technical solution for the detection and treatment of volatile organic compounds, the carrier gas velocity is corrected based on the actual gas inhalation volume, including:

[0036] Obtain the current baseline carrier gas velocity and carrier gas flow rate;

[0037] The value of the carrier gas velocity correction factor is determined based on the ratio of the actual gas intake to the carrier gas flow rate.

[0038] The present invention also provides a detection and processing system for volatile organic compounds, comprising:

[0039] The data acquisition module is used to detect the density of standard gas under standard parameters and store the concentration of organic matter in the standard gas, its corresponding average relative molecular mass, and density into the training dataset.

[0040] The modeling module is used to train a relational model based on the training dataset;

[0041] The data input module is used to obtain the distribution range of the relative molecular mass of each volatile organic compound in the gas to be tested, the gas parameters of the gas to be tested, and the density.

[0042] The first calculation module is used to determine the concentration range of volatile organic compounds in the gas to be tested under the standard parameters based on the distribution range, density, and the relationship model.

[0043] The second calculation module is used to determine the actual gas inhalation volume based on the standard parameters, the gas parameters, the concentration range, and the detection range.

[0044] The correction module is used to correct the carrier gas velocity based on the actual gas intake volume;

[0045] The output module is used to detect the concentration of volatile organic compounds in the gas to be tested and output the detection results.

[0046] Compared with the prior art, the beneficial effects of the present invention are that by associating gas density, relative molecular mass and concentration through a relational model and combining a gas parameter correction mechanism, the interference of temperature and pressure fluctuations on the detection results can be effectively eliminated, so that the detection values ​​under different working conditions can be traced back to the standard state, the error rate is reduced by more than 30%, thereby increasing the accuracy of the detection results.

[0047] Furthermore, by dynamically matching the concentration range with the instrument's optimal operating range, the actual gas inhalation volume is automatically calculated, avoiding signal distortion caused by exceeding the concentration limit. The detection linear range is widened to 2-3 times that of traditional methods, thereby increasing the accuracy of the detection results.

[0048] Furthermore, the carrier gas rate is adjusted in real time based on the actual inhalation volume to ensure stable sample transfer efficiency and control the repeatability error within 5%, thereby increasing the accuracy of the detection results.

[0049] Furthermore, the technical solution of this invention requires no manual intervention in parameter adjustment throughout the entire process, can be adapted to the detection of complex VOCs mixed systems, and is applicable to multiple scenarios such as laboratory analysis and industrial online monitoring. It reduces the reliance on the professional skills of operators, while shortening the detection cycle. It combines technological advancement with practical value, thereby improving the ease of operation. Attached Figure Description

[0050] Figure 1 This is a flowchart illustrating the steps of the method for detecting and processing volatile organic compounds according to an embodiment of the present invention;

[0051] Figure 2This is a flowchart illustrating the steps of determining the concentration range under standard parameters in an embodiment of the present invention.

[0052] Figure 3 This is a structural block diagram of the volatile organic compound detection and treatment method system according to an embodiment of the present invention. Detailed Implementation

[0053] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0055] Please see Figure 1 The diagram shown is a flowchart of the steps in the detection and treatment method for volatile organic compounds according to an embodiment of the present invention, including:

[0056] Step S1: Detect the density of the standard gas under standard parameters, and store the concentration of organic matter in the standard gas and its corresponding average relative molecular mass and density into the training dataset.

[0057] Step S2: Train the relation model based on the training dataset;

[0058] Step S3: Obtain the distribution range of the relative molecular mass of each volatile organic compound in the gas to be tested, the gas parameters of the gas to be tested, and the density;

[0059] Step S4: Determine the concentration range of volatile organic compounds in the gas to be tested under standard parameters based on the distribution range, density, and relationship model.

[0060] Step S5: Determine the actual gas inhalation volume based on standard parameters, gas parameters, concentration range, and detection range;

[0061] Step S6: Adjust the carrier gas velocity according to the actual gas intake volume;

[0062] Step S7: Detect the concentration of volatile organic compounds in the gas to be tested and output the detection results.

[0063] Furthermore, the standard gas is a mixture of air and volatile organic compounds with known average relative molecular mass, density, and concentration.

[0064] The standard parameters are preset gas parameter conditions. In this embodiment of the invention, the purpose of setting the standard parameters is only to unify the gas state at different pressures and temperatures through a unified physical state, so as to facilitate subsequent substitution into the relational model and determination of the actual inhalation volume. Therefore, the specific values ​​of the preset gas parameter conditions are not limited, as long as they are reasonable. Preferably, the standard parameters are set as follows: room temperature (25°C) and normal pressure (101.325 kPa).

[0065] Furthermore, the gas parameters are the pressure and temperature at which the concentration of volatile organic compounds is detected.

[0066] In the above technical solution, those skilled in the art will understand that, since the average density of air is 29, while the relative molecular mass of organic matter is usually between 100 and 200 or even higher, the higher the content of organic matter, the greater the difference between the gas to be tested and air. That is, the higher the concentration of organic matter in the gas to be tested, the greater the density and average relative molecular mass. Based on this, combined with existing formulas such as the ideal gas law, density calculation formula, and concentration calculation formula, it can be concluded that when the temperature, pressure, and concentration of volatile organic matter in the standard gas of air are determined, if the gas parameters are adjusted to the standard parameters of a unified standard, the determined density and average relative molecular mass will correspond to a unique organic matter concentration. The embodiments of the present invention represent this one-to-one correspondence by training a relational model. The gas intake is adjusted according to the output results of the training model to avoid the situation where the intake of organic matter in the air is too large, causing detector saturation and signal distortion, or the intake is too small, causing the signal to be too weak, noise to increase, and the detection result to be too low, thereby increasing the accuracy of the detection result.

[0067] Furthermore, the standard parameters are all preset values ​​for the gas parameters of the standard gas;

[0068] Gas parameters include pressure and temperature.

[0069] In detail, the relational model is built by using the correspondence between the average relative molecular mass and density of the standard gas and the concentration of organic matter in the standard gas as input data. If the average relative molecular mass and density of the gas to be tested are input, the concentration of organic matter in the gas to be tested under the standard parameters is output.

[0070] Specifically, by establishing a training dataset and training a relational model, the relationship between a set of organic matter concentrations and average relative molecular masses corresponds to a unique density. This provides a theoretical basis for adjusting the amount of gas inhaled based on the output of the training model, avoiding deviations in detection results caused by excessive or insufficient inhalation of organic matter in the inhaled air, thereby increasing the accuracy of the detection results.

[0071] Further, in step S4, the concentration range of volatile organic compounds in the gas to be tested under standard parameters is determined based on the distribution range, density, and relationship model. Please refer to [link to relevant documentation]. Figure 2 The diagram shows a flowchart of the method for determining the concentration range under standard parameters according to an embodiment of the present invention, including:

[0072] Step S401: Obtain the distribution range of the relative molecular mass of each volatile organic compound in the gas to be tested, the gas parameters of the gas to be tested, and the density;

[0073] Step S402: Based on the gas parameters and standard parameters, correct the density to the density of the gas to be tested under the standard parameters.

[0074] Step S403: Take the union of the distribution ranges of each volatile organic compound as the distribution range of the volatile organic compounds in the gas to be tested.

[0075] Step S404: Input the endpoint values ​​of the distribution range and the density of the gas to be tested under standard parameters into the relationship model to obtain the concentration range of volatile organic compounds in the gas to be tested under standard parameters.

[0076] Furthermore, it should be noted that the distribution range of the relative molecular mass of each volatile organic compound can be obtained by: identifying the types of volatile organic compounds and determining the distribution range of relative molecular mass based on the types; or obtaining the formula of volatile organic compounds in the analyte and obtaining the distribution range of relative molecular mass based on the formula; or other methods. The obtained distribution range of relative molecular mass should accurately reflect the distribution range of relative molecular mass. The detection of gas parameters and density of the analyte is based on existing technology and will not be elaborated upon here. In practice, the density is corrected to the density of the analyte under standard parameters. Under an ideal gas model, given the first state of air (first pressure, first temperature, first volume) and the corresponding first density, its second volume in the second state (i.e., the second volume under known conditions of second pressure and second temperature) and the corresponding second density can be directly calculated. This calculation process is independent of the volume parameters (the volume will automatically adjust with pressure and temperature, without affecting the density conversion relationship). This calculation process is based on existing technology and will not be elaborated upon here.

[0077] In detail, this invention obtains the distribution range of the relative molecular mass of each volatile organic compound and selects the union of these ranges as the distribution range, thus ensuring that the distribution range includes all average relative molecular mass values. Two extreme cases are selected: the average relative molecular mass is the minimum or maximum value of the distribution range. The minimum or maximum value is substituted into the relational model, and the density is corrected to a specific value. Therefore, the input distribution range is a range, and the output concentration value should also form a range. This provides a theoretical basis for adjusting the gas inhalation amount based on the output results of the training model, avoiding deviations in the detection results caused by excessive or insufficient inhalation of organic matter in the inhaled air, thereby increasing the accuracy of the detection results.

[0078] Further, in step S5, the actual gas inhalation volume is determined based on standard parameters, gas parameters, concentration range, and detection range, including:

[0079] Step S501: Determine the gas inhalation volume under standard parameters based on the concentration range and detection range;

[0080] Step S502: Determine the actual gas inhalation volume based on the standard parameters, gas parameters, and the gas inhalation volume of the gas to be tested under the standard parameters;

[0081] The detection range is the range of the amount of substance that the detection instrument can detect at the concentration level.

[0082] Specifically, in step S501, determining the gas inhalation volume under standard parameters based on the concentration range and detection range includes:

[0083] Step S5011: Obtain the maximum and minimum values ​​of the concentration range;

[0084] Step S5012: Determine the first gas inhalation volume range based on the maximum value of the concentration range and the detection range;

[0085] Step S5013: Determine the second gas inhalation volume range based on the minimum value of the concentration range and the detection range;

[0086] Step S5014: Take the intersection of the first gas inhalation volume range and the second gas inhalation volume range as the gas inhalation volume range of the gas to be tested under standard parameters.

[0087] Step S5015: Determine the gas intake of the gas to be tested under standard parameters based on the gas intake range.

[0088] Furthermore, by determining the range of substances that the detection instrument can detect, and thus the concentration range of organic substances in the environment, the maximum and minimum values ​​of each concentration range are used to calculate the detection range (the concentration of volatile organic compounds will never exceed the maximum or be less than the minimum). This yields a first gas inhalation range and a second gas inhalation range. Specifically, when the inhaled gas volume is the intersection of the first and second gas inhalation ranges, regardless of the ambient concentration, the amount of inhaled substance meets the detection range of the instrument, and the instrument's output is accurate. If the intersection does not exist, it indicates that the current equipment may be exceeding the detection range during the detection process and cannot accurately measure volatile organic compounds in the air. In this case, the detection instrument should be replaced or another method should be used for detection. The intersection of the first gas inhalation range and the second gas inhalation range is taken as the gas inhalation range of the gas to be tested under standard parameters. That is, as long as the gas inhalation is within this range, the detection device will accurately detect volatile organic substances. Preferably, the gas inhalation value is the midpoint of the gas inhalation range of the gas to be tested under standard parameters.

[0089] In detail, to ensure that the amount of inhaled organic matter falls within the detection range of the testing equipment, a smaller inhalation volume should correspond to a higher concentration, and a larger inhalation volume should correspond to a lower concentration. This creates a range for the inhalation volume. Inhaling the gas within this range will prevent the concentration from being too high or too low, ensuring that the amount of inhaled organic matter is within the detection range. This avoids deviations in the test results caused by excessive or insufficient inhalation of organic matter from the air, thereby increasing the accuracy of the test results.

[0090] Further, in step S6, the carrier gas velocity is corrected based on the actual gas intake, including:

[0091] Obtain the current baseline carrier gas velocity and carrier gas flow rate;

[0092] Corrected carrier gas velocity = current reference carrier gas velocity × (actual gas intake / preset standard intake); the value of the carrier gas velocity correction factor is determined based on the ratio of actual gas intake to carrier gas flow rate.

[0093] In detail, the carrier gas velocity is adjusted according to the correction coefficient to obtain the corrected carrier gas velocity, ensuring that the actual number of volatile organic compound molecules entering the detection system under different pressure and temperature conditions is equivalent to the detection conditions under standard parameters, thereby eliminating the influence of gas expansion or compression on concentration detection and further increasing the accuracy of detection results.

[0094] Please see Figure 3 The diagram shown is a structural block diagram of a volatile organic compound detection and processing system according to an embodiment of the present invention, comprising:

[0095] The data acquisition module is used to detect the density of standard gas under standard parameters and store the concentration of organic matter in the standard gas, its corresponding average relative molecular mass, and density into the training dataset.

[0096] The modeling module is used to train a relational model based on the training dataset.

[0097] The data input module is used to obtain the distribution range of the relative molecular mass of each volatile organic compound in the gas to be tested, the gas parameters of the gas to be tested, and the density.

[0098] The first calculation module is used to determine the concentration range of volatile organic compounds in the gas to be tested under standard parameters based on the distribution range, density, and relationship model.

[0099] The second calculation module is used to determine the actual gas inhalation volume based on standard parameters, gas parameters, concentration range, and detection range.

[0100] The correction module is used to correct the carrier gas velocity based on the actual gas intake.

[0101] The output module is used to detect the concentration of volatile organic compounds in the gas to be tested and output the detection results.

[0102] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for detecting and treating volatile organic compounds, characterized in that, include: The density of a standard gas under standard parameters is detected, and the concentration of organic matter in the standard gas, its corresponding average relative molecular mass, and density are stored in the training dataset. Train a relational model based on the training dataset; To obtain the distribution range of the relative molecular mass of each volatile organic compound in the gas to be tested, the gas parameters of the gas to be tested, and the density; The concentration range of volatile organic compounds in the gas to be tested under the standard parameters is determined based on the distribution range, density, and relationship model. The actual gas inhalation volume is determined based on the standard parameters, the gas parameters of the gas to be tested, the concentration range, and the detection range. The carrier gas velocity is adjusted based on the actual gas intake volume. The concentration of volatile organic compounds in the gas to be tested is detected, and the test results are output. The standard parameters are all preset values ​​for the gas parameters of the standard gas. The gas parameters include: pressure and temperature; The relationship model is built by taking the correspondence between the average relative molecular mass and density of the standard gas and the concentration of organic matter in the standard gas as input data. If the average relative molecular mass and density of the gas to be tested are input, the concentration of organic matter in the gas to be tested under standard parameters is output. The actual gas inhalation volume is determined based on the standard parameters, the gas parameters of the gas to be tested, the concentration range, and the detection range, including: The gas inhalation volume under the standard parameters is determined based on the concentration range and the detection range. The actual gas inhalation volume is determined based on the standard parameters, the gas parameters of the gas to be tested, and the gas inhalation volume of the gas to be tested under the standard parameters. The detection range is the range of the amount of substance that the detection instrument can detect at the concentration of the substance. The gas parameters of the gas to be tested are the pressure and temperature at which the concentration of volatile organic compounds is detected.

2. The method for detecting and processing volatile organic compounds according to claim 1, characterized in that, The concentration range of volatile organic compounds in the gas to be tested under the standard parameters is determined based on the distribution range, density, and relationship model, including: To obtain the distribution range of the relative molecular mass of each volatile organic compound in the gas to be tested, the gas parameters of the gas to be tested, and the density; Based on the gas parameters and standard parameters, the density is corrected to the density of the gas to be tested under the standard parameters; The union of the distribution ranges of each volatile organic compound is taken as the distribution range of the volatile organic compounds in the gas to be tested. By inputting the endpoints of the distribution range and the density of the gas to be tested under standard parameters into the relationship model, the concentration range of volatile organic compounds in the gas to be tested under the standard parameters is obtained.

3. The method for detecting and processing volatile organic compounds according to claim 1, characterized in that, Determining the gas inhalation volume under the standard parameters based on the concentration range and the detection range includes: Obtain the maximum and minimum values ​​within the concentration range; The first gas inhalation volume range is determined based on the maximum value of the concentration range and the detection range; The second gas inhalation volume range is determined based on the minimum value of the concentration range and the detection range. The intersection of the first gas inhalation volume range and the second gas inhalation volume range is taken as the gas inhalation volume range of the gas to be tested under standard parameters. The gas intake volume of the test gas under standard parameters is determined based on the gas intake volume range.

4. The method for detecting and processing volatile organic compounds according to claim 1, characterized in that, The standard gas is a mixture of air and volatile organic compounds containing known average relative molecular mass, density, and concentration. The standard parameters are preset gas parameter conditions.

5. The method for detecting and processing volatile organic compounds according to claim 1, characterized in that, Correcting the carrier gas velocity based on the actual gas intake includes: Obtain the current baseline carrier gas velocity and carrier gas flow rate; The value of the carrier gas velocity correction factor is determined based on the ratio of the actual gas intake to the carrier gas flow rate.

6. A system for detecting and processing volatile organic compounds, used to implement the method for detecting and processing volatile organic compounds according to any one of claims 1 to 5, characterized in that, include: The data acquisition module is used to detect the density of standard gas under standard parameters and store the concentration of organic matter in the standard gas, its corresponding average relative molecular mass, and density into the training dataset. The modeling module is used to train a relational model based on the training dataset; The data input module is used to obtain the distribution range of the relative molecular mass of each volatile organic compound in the gas to be tested, the gas parameters of the gas to be tested, and the density. The first calculation module is used to determine the concentration range of volatile organic compounds in the gas to be tested under the standard parameters based on the distribution range, density, and the relationship model. The second calculation module is used to determine the actual gas inhalation volume based on the standard parameters, the gas parameters of the gas to be tested, the concentration range, and the detection range. The correction module is used to correct the carrier gas velocity based on the actual gas intake volume; The output module is used to detect the concentration of volatile organic compounds in the gas to be tested and output the detection results.

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