Volatile organic compound emission flux determination method and device and electronic equipment

Abstract

The invention provides a volatile organic compound emission flux determination method and device and electronic equipment, which are applied to an emission flux monitoring system, and the emission flux monitoring system comprises a mobile monitoring platform and an unmanned aerial vehicle monitoring platform. The method comprises the following steps: acquiring a first discharge flux of target volatile organic compounds discharged by a plurality of groups of discharge sources in the upwind direction of a monitoring site, and acquiring a second discharge flux of the target volatile organic compounds discharged by the plurality of groups of discharge sources in the downwind direction of the monitoring site, the first discharge flux is determined according to a flight path line of the first unmanned aerial vehicle; the second emission flux is determined according to a flight path line of the second unmanned aerial vehicle; and obtaining the emission flux of the target volatile organic compound based on the multiple groups of first emission fluxes and the multiple groups of second emission fluxes. The discharge flux of the volatile organic compounds can be accurately monitored.

Description

Technical Field

[0001] The present invention relates to the technical field of emission flux monitoring, and particularly to a method, a device and an electronic device for determining the emission flux of volatile organic compounds. Background Art

[0002] As known from the related art, the solar occultation flux (SOF) remote sensing measurement technology is a technology used to measure the emission flux of volatile organic compounds (VOCs) emitted from VOCs emission sources into the atmosphere.

[0003] However, in the current process of monitoring the VOCs emission flux, there is a deviation between the measured wind field data and the actual wind field data driving the movement of the VOCs plume, resulting in a relatively high uncertainty in the monitored VOCs emission flux.

[0004] Currently, finding a method that can accurately monitor the emission flux of volatile organic compounds (VOCs) has become a research hotspot. Summary of the Invention

[0005] The present invention provides a method, a device and an electronic device for determining the emission flux of volatile organic compounds, so as to accurately monitor the emission flux of volatile organic compounds.

[0006] The present invention provides a method for determining the emission flux of volatile organic compounds, which is applied to an emission flux monitoring system. The emission flux monitoring system includes a mobile monitoring platform and an unmanned aerial vehicle (UAV) monitoring platform. The method includes: obtaining a plurality of groups of first emission fluxes of target volatile organic compounds emitted by emission sources in the upwind direction of the monitoring site, and obtaining a plurality of groups of second emission fluxes of the target volatile organic compounds emitted by the emission sources in the downwind direction of the monitoring site. Among them, the first emission flux is determined according to a first UAV flight trajectory line, and the first UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the first column concentration of the target volatile organic compound is detected in the upwind direction; the second emission flux is determined according to a second UAV flight trajectory line, and the second UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the second column concentration of the target volatile organic compound is detected in the downwind direction; based on the plurality of groups of the first emission fluxes and the plurality of groups of the second emission fluxes, the emission flux of the target volatile organic compound is obtained.

[0007] A method for determining the emission flux of volatile organic compounds provided by the present invention. The unmanned aerial vehicle (UAV) monitoring platform is provided with sensors. The first UAV flight trajectory line is obtained in the following manner: when the first column concentration of the target volatile organic compound is detected by the infrared spectrometer provided in the mobile monitoring platform, the first ground position where the first column concentration is detected is determined; with the first ground position as a reference, the UAV monitoring platform is started to fly in a Z - shape along the vertical direction, and the concentrations of the target volatile organic compounds are recorded based on the sensors to obtain the spatial concentration distribution of the plume cross - section formed by the target volatile organic compounds, where the abscissa of the spatial concentration distribution of the plume cross - section is the sampling point along the horizontal direction, and the ordinate is the concentrations of the target volatile organic compounds recorded by the sensors; based on the spatial concentration distribution of the plume cross - section, the position points where the highest concentration of the target volatile organic compounds at each sampling point is located in the vertical direction are determined; the position points where the highest concentration of each target volatile organic compound is located in the vertical direction are connected to obtain the first UAV flight trajectory line.

[0008] A method for determining the emission flux of volatile organic compounds provided by the present invention. The UAV monitoring platform is provided with multiple sensors in the vertical direction. The first emission flux is determined in the following manner: the UAV monitoring platform is started to move horizontally in synchronization with the mobile monitoring platform; when the emission source in the upwind direction of the monitoring site emits the target volatile organic compound, when the mobile monitoring platform detects the third column concentration of the target volatile organic compound, the flight height of the UAV monitoring platform is adjusted so that the height trajectory of the target sensor coincides with the first UAV flight trajectory line, where the target sensor is the sensor in the middle position among the multiple sensors; multiple sensors are controlled to synchronously monitor the first volatile organic compound concentration of the target volatile organic compound, and the first wind speed is synchronously monitored based on multiple anemometers provided on the UAV monitoring platform and matched with the sensors; based on the first wind speed, the first component wind speed of the first wind speed in the direction perpendicular to the movement direction of the mobile monitoring platform is obtained; the first position of the emission flux monitoring system corresponding to the case where the third column concentration is obtained is acquired; based on the third column concentration, the first component wind speed, the first volatile organic compound concentration, and the first position, the first emission flux is obtained.

[0009] According to a method for determining the emission flux of volatile organic compounds provided by the present invention, during the process of monitoring the first emission flux, multiple groups of the first positions are continuously acquired. When the first volatile organic compound concentration cannot be detected by multiple sensors corresponding to the current first position, the first emission flux is determined in the following manner: When the first volatile organic compound concentration is detected by multiple sensors corresponding to an adjacent first position, determine the third column concentration detected by the mobile monitoring platform corresponding to the current first position; determine the first volatile organic compound concentration detected by multiple sensors corresponding to the adjacent first position, and determine the first wind speed synchronously monitored by an anemometer matched with multiple sensors corresponding to the adjacent first position, and determine the first component wind speed of the first wind speed in the direction perpendicular to the movement direction of the mobile monitoring platform; based on the third column concentration, the first position, the first volatile organic compound concentration, and the first component wind speed, determine the first emission flux, where the position distance difference between the adjacent first position and the current first position is less than or equal to the position distance difference threshold.

[0010] According to a method for determining the emission flux of volatile organic compounds provided by the present invention, during the process of monitoring the first emission flux, multiple groups of the first positions are continuously acquired. When the first volatile organic compound concentration cannot be detected by multiple sensors corresponding to each group of the first positions, the first emission flux is determined in the following manner: Determine the respective first wind speeds synchronously monitored by anemometers matched with multiple sensors corresponding to each group of the first positions, and determine the respective first component wind speeds of the respective first wind speeds in the direction perpendicular to the movement direction of the mobile monitoring platform; based on the respective first component wind speeds, obtain the average value of the first component wind speeds; determine the third column concentration detected by the mobile monitoring platform corresponding to the current first position; based on the third column concentration, the first position, and the average value of the first component wind speeds, determine the first emission flux.

[0011] According to a method for determining the emission flux of volatile organic compounds provided by the present invention, after obtaining the first emission flux, the method further includes: taking the first emission flux as the first emission flux of the current round, and obtaining the first emission fluxes of multiple subsequent rounds of the current round. Wherein, before determining the first emission fluxes of the subsequent rounds, the first drone flight trajectory lines corresponding to the first emission fluxes of the subsequent rounds are respectively determined, and each of the first drone flight trajectory lines of the subsequent rounds is determined according to the first drone flight trajectory line of the previous round; based on the first drone flight trajectory lines of the subsequent rounds, multiple first emission fluxes of the subsequent rounds are determined according to the steps of determining the first emission flux; the weight values of each of the first emission fluxes of the subsequent rounds are respectively determined; based on each of the first emission fluxes of the subsequent rounds and the corresponding weight values, an optimized first emission flux is determined, and the optimized first emission flux is taken as the final first emission flux.

[0012] According to a method for determining the emission flux of volatile organic compounds provided by the present invention, the weight value is determined in the following manner: during the process of determining each of the first emission fluxes of the subsequent rounds, the weight value is determined according to the number of target monitoring sites monitored by the drone monitoring platform, wherein the weight value is positively correlated with the number of target monitoring sites, and the number of target monitoring sites represents the difference between the number of positions of multiple groups of the first positions continuously obtained and the number of invalid monitoring sites. The invalid monitoring sites include the first positions corresponding to the first state and the first positions corresponding to the second state. The first state indicates that each of the sensors does not monitor the concentration of the first volatile organic compound; the second state indicates that the concentration of the first volatile organic compound monitored by the outermost sensor among the multiple sensors is the highest and the concentrations of the first volatile organic compound monitored by the other sensors adjacent to the outermost sensor decrease in sequence.

[0013] The present invention also provides a device for determining the emission flux of volatile organic compounds, which is applied to an emission flux monitoring system. The emission flux monitoring system includes a mobile monitoring platform and a drone monitoring platform. The device includes: an acquisition module, configured to acquire a first emission flux of a target volatile organic compound emitted by multiple emission sources in the upwind direction of the monitoring site, and a second emission flux of the target volatile organic compound emitted by multiple emission sources in the downwind direction of the monitoring site. The first emission flux is determined according to a first drone flight trajectory line, and the first drone flight trajectory line is determined based on the position of the highest concentration of the target volatile organic compound in the vertical direction when the first column concentration of the target volatile organic compound is detected in the upwind direction. The second emission flux is determined according to a second drone flight trajectory line, and the second drone flight trajectory line is determined based on the position of the highest concentration of the target volatile organic compound in the vertical direction when the second column concentration of the target volatile organic compound is detected in the downwind direction. A processing module, configured to obtain the emission flux of the target volatile organic compound based on multiple groups of the first emission flux and multiple groups of the second emission flux.

[0014] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements the method for determining the emission flux of volatile organic compounds as described in any one of the above.

[0015] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the method for determining the emission flux of volatile organic compounds as described in any one of the above.

[0016] The present invention also provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the method for determining the emission flux of volatile organic compounds as described in any one of the above.

[0017] The method, device, and electronic equipment for determining the emission flux of volatile organic compounds provided by the present invention are applied to an emission flux monitoring system. The emission flux monitoring system includes a mobile monitoring platform and an unmanned aerial vehicle (UAV) monitoring platform. By obtaining multiple sets of the first emission fluxes of the target volatile organic compounds emitted by emission sources in the upwind direction of the monitoring site, and multiple sets of the second emission fluxes of the target volatile organic compounds emitted by emission sources in the downwind direction of the monitoring site, and based on the multiple sets of the first emission fluxes and the multiple sets of the second emission fluxes, the emission flux of the target volatile organic compounds is obtained. Among them, the first emission flux is determined according to the first UAV flight trajectory line. The first UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound is located in the vertical direction when the first column concentration of the target volatile organic compound is detected in the upwind direction. The second emission flux is determined according to the second UAV flight trajectory line. The second UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound is located in the vertical direction when the second column concentration of the target volatile organic compound is detected in the downwind direction. Since the first UAV flight trajectory line and the second UAV flight trajectory line can better match the actual wind field data driving the movement of the VOCs plume, it can be ensured that the obtained first emission flux and second emission flux are more accurate, thereby enabling the accurate acquisition of the emission flux of volatile organic compounds. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is one of the flow diagrams of the method for determining the emission flux of volatile organic compounds provided by the present invention;

[0020] Figure 2 It is one of the flow diagrams for determining the first emission flux provided by the present invention;

[0021] Figure 3 It is the second flow diagram for determining the first emission flux provided by the present invention;

[0022] Figure 4 It is the third flow diagram for determining the first emission flux provided by the present invention;

[0023] Figure 5 It is the structural diagram of the device for determining the emission flux of volatile organic compounds provided by the present invention;

[0024] Figure 6It is a schematic structural diagram of the electronic device provided by the present invention. Specific Embodiments

[0025] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] The method for determining the emission flux of volatile organic compounds provided by the present invention improves the accuracy of the monitored VOCs emission flux by improving the problem that there is a deviation between the wind field data in the current SOF monitoring technology and the actual wind field data driving the movement of VOCs plumes.

[0027] Figure 1 It is one of the schematic flowcharts of the method for determining the emission flux of volatile organic compounds provided by the present invention.

[0028] The following will be combined with Figure 1 to illustrate the process of the method for determining the emission flux of volatile organic compounds provided by the present invention.

[0029] In an exemplary embodiment of the present invention, combined with Figure 1 it can be seen that the method for determining the emission flux of volatile organic compounds may include step 110 and step 120, and each step will be introduced separately below.

[0030] In step 110, a first emission flux of the target volatile organic compounds emitted by multiple emission sources is obtained upwind of the monitoring site, and a second emission flux of the target volatile organic compounds emitted by multiple emission sources is obtained downwind of the monitoring site.

[0031] In step 120, based on multiple groups of the first emission flux and multiple groups of the second emission flux, the emission flux of the target volatile organic compounds is obtained.

[0032] It should be noted that obtaining the second emission flux of the target volatile organic compounds emitted by multiple emission sources downwind of the monitoring site may include the emission flux formed by the target volatile organic compounds emitted by the emission sources upwind of the monitoring site drifting downwind of the monitoring site, or may include the emission flux formed by the target volatile organic compounds emitted by the emission sources inside the monitoring site drifting downwind of the monitoring site.

[0033] Among them, the first emission flux is determined according to the flight trajectory line of the first drone. The flight trajectory line of the first drone is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction exists when the first column concentration of the target volatile organic compound is monitored in the upwind direction.

[0034] The second emission flux is determined according to the flight trajectory line of the second drone. The flight trajectory line of the second drone is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction exists when the second column concentration of the target volatile organic compound is monitored in the downwind direction.

[0035] In one embodiment, multiple sets of the first emission fluxes of the target volatile organic compounds emitted by the emission sources can be obtained upwind of the monitoring site, and multiple sets of the second emission fluxes of the target volatile organic compounds emitted by the emission sources can be obtained downwind of the monitoring site. Among them, the first emission flux is the emission flux of the target volatile organic compounds emitted by the emission sources upwind of the monitoring site; the second emission flux is the emission flux of the target volatile organic compounds emitted by the emission sources at the monitoring site and upwind of the monitoring site; the acquisition methods of the first emission flux and the second emission flux are the same. In this embodiment, the acquisition process of the first emission flux is described.

[0036] It can be understood that the first emission flux is determined according to the flight trajectory line of the first drone, and the flight trajectory line of the first drone is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction exists, which can effectively reduce the deviation between the actual wind field data driving the movement of the VOCs plume and the wind field data used in the process of calculating the emission flux. Furthermore, it can ensure that the obtained first emission flux and second emission flux are more accurate, laying a foundation for accurately obtaining the emission flux of volatile organic compounds.

[0037] In one embodiment, the multiple sets of the first emission fluxes of the target volatile organic compounds emitted by the emission sources obtained upwind of the monitoring site can be summed up to obtain the sum of the first emission fluxes; the multiple sets of the second emission fluxes of the target volatile organic compounds emitted by the emission sources obtained downwind of the monitoring site can be summed up to obtain the sum of the second emission fluxes. Then, a subtraction process is performed based on the sum of the second emission fluxes and the sum of the first emission fluxes to obtain the emission flux of the target volatile organic compound.

[0038] The method for determining the emission flux of volatile organic compounds provided by the present invention is applied to an emission flux monitoring system. The emission flux monitoring system includes a mobile monitoring platform and an unmanned aerial vehicle (UAV) monitoring platform. By obtaining multiple sets of the first emission fluxes of the target volatile organic compounds emitted by emission sources in the upwind direction of the monitoring site, and multiple sets of the second emission fluxes of the target volatile organic compounds emitted by emission sources in the downwind direction of the monitoring site, and based on the multiple sets of the first emission fluxes and the multiple sets of the second emission fluxes, the emission flux of the target volatile organic compounds is obtained. Among them, the first emission flux is determined according to the first UAV flight trajectory line. The first UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the first column concentration of the target volatile organic compound is detected in the upwind direction. The second emission flux is determined according to the second UAV flight trajectory line. The second UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the second column concentration of the target volatile organic compound is detected in the downwind direction. Since the first UAV flight trajectory line and the second UAV flight trajectory line can better match the actual wind field data driving the movement of the VOCs plume, it can further ensure that the obtained first emission flux and second emission flux are more accurate, thereby achieving the accurate determination of the emission flux of volatile organic compounds.

[0039] To further introduce the method for determining the emission flux of volatile organic compounds provided by the present invention, the following will be described in conjunction with the following embodiments.

[0040] In one embodiment, the mobile monitoring platform may be provided with a Fourier transform infrared spectrometer and a sun tracker. When the mobile monitoring platform is moving, the sun tracker can always keep pointing to the sun and introduce the sunlight into the Fourier transform infrared spectrometer. Among them, the mobile monitoring platform may include a vehicle, a ship, a large-load aircraft, etc. as the platform base.

[0041] In another embodiment, a GPS device may also be carried and fixed on the mobile monitoring platform to record the position information of the mobile monitoring platform, and can also ensure the synchronous movement of the mobile monitoring platform and the UAV monitoring platform.

[0042] In one embodiment, the UAV monitoring platform is provided with multiple sensors in the vertical direction.

[0043] In another example, the UAV monitoring platform may also be provided with an anemometer, a VOCs monitoring sensor (also known as a sensor), a CPU, a communication module, a GPS, etc. Among them, the communication module is used to realize the communication connection between the UAV monitoring platform and the mobile monitoring platform. The GPS is used to record the position information of the UAV monitoring platform, and can also ensure the synchronous movement of the mobile monitoring platform and the UAV monitoring platform.

[0044] The CPU is used to automatically control an anemometer, a VOCs monitoring sensor, and a GPS, and automatically control the movement of the unmanned aerial vehicle (UAV) monitoring platform in the horizontal and vertical directions after it takes off. In addition, the data stored by the CPU can be transmitted to the mobile monitoring platform through a communication module for calculating the emission flux of VOCs based on the real-time recorded data.

[0045] In another embodiment, the anemometer and the VOCs monitoring sensor can be integrated into a module A, and 3 to 10 module As can be suspended at the bottom of the UAV monitoring platform in a vertical direction in sequence through strong steel wires, with an average distance of 3 to 10 meters between each module.

[0046] In another exemplary embodiment of the present invention, the first UAV flight trajectory line can be obtained in the following manner:

[0047] In the case where the first column concentration of the target volatile organic compound is detected by the infrared spectrometer provided in the mobile monitoring platform, determine the first ground position where the first column concentration is detected;

[0048] Taking the first ground position as a reference, start the UAV monitoring platform equipped with sensors to fly in a Z-shape along the vertical direction, and record the concentrations of multiple target volatile organic compounds based on the sensors to obtain the spatial concentration distribution of the plume cross-section formed by the target volatile organic compounds. Among them, the abscissa of the spatial concentration distribution of the plume cross-section is the sampling point along the horizontal direction, and the ordinate is the concentrations of multiple target volatile organic compounds recorded by the sensors;

[0049] Based on the spatial concentration distribution of the plume cross-section, determine the position points where the highest concentrations of the target volatile organic compounds at each sampling point are located in the vertical direction;

[0050] Connect the position points where the highest concentrations of each target volatile organic compound are located in the vertical direction to obtain the first UAV flight trajectory line.

[0051] In one embodiment, before officially entering the monitoring of the emission flux of the target volatile organic compound, the UAV can be lifted in the vertical space around the geographical location where the column concentration of an emission source appears, and the UAV starts to fly in a Z-shape along the vertical direction from the ground position. In other words, in the case where the first column concentration of the target volatile organic compound is detected by the infrared spectrometer provided in the mobile monitoring platform, determine the first ground position where the first column concentration is detected. Further, taking the first ground position as a reference, start the UAV monitoring platform to fly in a Z-shape along the vertical direction.

[0052] In yet another embodiment, the concentrations of multiple target volatile organic compounds can be recorded based on sensors to obtain the spatial concentration distribution of the plume cross-section formed by the target volatile organic compounds. Since the spatial concentration distribution of the plume cross-section can include multiple sampling points along the horizontal direction, therefore, based on the spatial concentration distribution of the plume cross-section, the position where the highest concentration of the target volatile organic compound at each sampling point is located in the vertical direction corresponding to the sampling point can be determined. And the positions where the highest concentrations of each target volatile organic compound are located in the vertical direction are connected to obtain the first UAV flight trajectory line.

[0053] It can be understood that the first UAV flight trajectory line can accurately estimate the distribution of the VOCs plume in height, laying a foundation for obtaining accurate wind field data and calculating accurate emission fluxes based on the wind field data.

[0054] Figure 2 It is one of the schematic flowcharts for determining the first emission flux provided by the present invention.

[0055] Next, in combination with Figure 2 The process of determining the first emission flux provided by the present invention will be described.

[0056] In an exemplary embodiment of the present invention, a plurality of sensors can be arranged on the UAV monitoring platform in the vertical direction. Combining Figure 2 It can be known that determining the first emission flux can include steps 210 to 260, and each step will be introduced separately below.

[0057] In step 210, start the UAV monitoring platform to maintain lateral synchronous movement with the mobile monitoring platform.

[0058] In step 220, when the emission source upwind of the monitoring site emits the target volatile organic compound, when the mobile monitoring platform monitors the third column concentration of the target volatile organic compound, adjust the flight height of the UAV monitoring platform and make the height trajectory of the target sensor coincide with the first UAV flight trajectory line.

[0059] In one embodiment, when officially monitoring the emission flux of the target volatile organic compound, when the emission source upwind of the monitoring site emits the target volatile organic compound, when the mobile monitoring platform monitors the third column concentration of the target volatile organic compound, start the UAV monitoring platform, and adjust the UAV flight height according to the height of the first UAV flight trajectory line, so that the height trajectory of the sensor at the middle position in the suspended sensor module below coincides with the first UAV flight trajectory line, that is, control the height trajectory of the target sensor to coincide with the first UAV flight trajectory line, where the target sensor is the sensor at the middle position among the multiple sensors.

[0060] In step 230, control multiple sensors to synchronously monitor the concentration of a first volatile organic compound of the target volatile organic compounds, and synchronously monitor the first wind speed based on multiple anemometers matched with the sensors arranged on the unmanned aerial vehicle monitoring platform.

[0061] In step 240, based on the first wind speed, obtain a first component wind speed of the first wind speed in a direction perpendicular to the moving direction of the moving monitoring platform.

[0062] In one embodiment, the unmanned aerial vehicle monitoring platform can be started to move synchronously with the moving monitoring platform, and when the third column concentration of the target volatile organic compounds is monitored based on the moving monitoring platform, multiple sensors can be controlled to synchronously monitor the concentration of a first volatile organic compound of the target volatile organic compounds, and the first wind speed can be synchronously monitored based on multiple anemometers matched with the sensors arranged on the unmanned aerial vehicle monitoring platform.

[0063] Furthermore, based on the first wind speed, obtain a first component wind speed of the first wind speed in a direction perpendicular to the moving direction of the moving monitoring platform.

[0064] In step 250, obtain a first position of the emission flux monitoring system corresponding to the case where the third column concentration is obtained.

[0065] In step 260, based on the third column concentration, the first component wind speed, the concentration of the first volatile organic compound, and the first position, obtain a first emission flux.

[0066] In one embodiment, the first position of the emission flux monitoring system corresponding to the case where the third column concentration is obtained can be determined based on GPS, and the first emission flux can be obtained based on the third column concentration, the first component wind speed, the concentration of the first volatile organic compound, and the first position.

[0067] Among them, the first emission flux can be realized by the following formulas (1)-(2):

[0068]

[0069]

[0070] Among them, y represents the position information recorded by GPS each time the spectrometer collects spectral data (reaction column concentration data), that is, the first position of the emission flux monitoring system corresponding to the case of obtaining the third column concentration. y1 and y2 represent the position information of the mobile monitoring platform from the start to the end of the monitored VOCs emission plume, that is, the starting position and the ending position of the VOCs pollution zone profile. v⊥(y) represents the representative component wind speed value of the wind field driving the VOCs plume movement at position y perpendicular to the movement direction of the mobile monitoring platform. vi⊥(y) represents the component wind speed value perpendicular to the movement direction of the mobile monitoring platform measured by the i-th anemometer of the unmanned aerial vehicle monitoring platform at position y, that is, the first component wind speed of the first wind speed in the direction perpendicular to the movement direction of the mobile monitoring platform. ci(y) represents the VOCs concentration value measured by the i-th VOCs sensor of the unmanned aerial vehicle monitoring platform at position y, that is, the first VOCs concentration corresponding to the target volatile organic compound. c(y) represents the VOCs column concentration data measured by the spectrometer at position y, that is, the third column concentration of the target volatile organic compound monitored by the mobile monitoring platform.

[0071] It should be noted that during the process of monitoring the emission flux, special situations may also occur. The determination method of the first emission flux in special situations will be described below.

[0072] Figure 3 It is the second schematic flow chart of determining the first emission flux provided by the present invention.

[0073] In an exemplary embodiment of the present invention, during the process of monitoring the first emission flux, multiple groups of first positions are continuously obtained. In the case where the first VOCs concentration cannot be monitored by multiple sensors corresponding to the current first position, combined with Figure 3 It can be known that the first emission flux may include steps 310 to 340. Each step will be introduced separately below.

[0074] In step 310, when the first VOCs concentration is monitored by multiple sensors corresponding to the adjacent first position, determine the third column concentration monitored by the mobile monitoring platform corresponding to the current first position.

[0075] In step 320, determine the first VOCs concentration monitored by multiple sensors corresponding to the adjacent first position.

[0076] In step 330, determine the first wind speed synchronously monitored by the anemometer matched with multiple sensors corresponding to the adjacent first position, and determine the first component wind speed of the first wind speed in the direction perpendicular to the movement direction of the mobile monitoring platform.

[0077] In step 340, determine the first emission flux based on the third column concentration, the first position, the first VOCs concentration, and the first component wind speed.

[0078] It is understandable that since the UAV monitoring platform is provided with multiple sensors, any of the multiple first positions (such as the current first position) obtained continuously can correspond to multiple sensors.

[0079] It should be noted that in the case where the first volatile organic compound concentration cannot be detected by any of the multiple sensors corresponding to the current first position, it can be considered that the plume height locked at the current first position is inaccurate. In this scenario, the first emission flux can be determined based on the data corresponding to the adjacent first position.

[0080] In one embodiment, in the case where the first volatile organic compound concentration cannot be detected by any of the multiple sensors corresponding to the current first position, and in the case where the first volatile organic compound concentration is detected by the multiple sensors corresponding to the adjacent first position, the third column concentration monitored by the mobile monitoring platform corresponding to the current first position can be determined respectively, the first volatile organic compound concentration monitored by the multiple sensors corresponding to the adjacent first position can be determined; and the first wind speed synchronously monitored by the anemometer matched with the multiple sensors corresponding to the adjacent first position can be determined, and the first component wind speed of the first wind speed in the direction perpendicular to the movement direction of the mobile monitoring platform can be determined.

[0081] Furthermore, based on the third column concentration, the first position, the first volatile organic compound concentration, and the first component wind speed, the first emission flux is determined. It is understandable that the first position here can be the current first position described above.

[0082] Wherein, the position distance difference between the adjacent first position and the current first position is less than or equal to the position distance difference threshold. It should be noted that the position distance difference threshold can be adjusted according to the actual situation and is not specifically limited in this embodiment.

[0083] In another embodiment, when the UAV VOCs sensors corresponding to the y position (corresponding to the current first position) of the column concentration monitoring point have no response (the reading is 0), the component wind speed value at this position (corresponding to the current first position) is the component wind speed value or the average value of the component wind speed values at the y positions (corresponding to the adjacent first position) of the 1 or 2 column concentration monitoring points closest to it, and participates in the flux calculation. Among them, the component wind speed value or the average value of the component wind speed values at the y positions (corresponding to the adjacent first position) of the 1 or 2 column concentration monitoring points closest to it can be determined according to the first volatile organic compound concentration and the first component wind speed.

[0084] After obtaining the component wind speed value or the average value of the component wind speed value at the y position of the nearest one or two column concentration monitoring points (corresponding to the first position), the first emission flux can be obtained by combining the third column concentration and the first position. It can be understood that the first position here can be the current first position mentioned above.

[0085] In another embodiment, the above-mentioned embodiment is continued as an example for explanation. If the VOCs sensors of the UAVs corresponding to the y position of the adjacent nearest column concentration monitoring point still have no response (the reading is 0), then the analogy continues to the next adjacent y position (corresponding to the first position) until at least one VOCs sensor of the UAV corresponding to the position has a response value, and the component wind speed value at the first position is the same as the component wind speed value or the component wind speed average value at the position, and participates in the flux calculation.

[0086] The following will be combined Figure 4 A method for determining the first emission flux in another special case is described below.

[0087] Figure 4 This is the third flow chart of determining the first emission flux provided by the present invention.

[0088] In an exemplary embodiment of the present invention, multiple groups of first positions are continuously acquired during the process of monitoring the first emission flux. When multiple sensors corresponding to each group of first positions cannot monitor the first volatile organic compound concentration, the first position of the first position is detected by combining the first position of the first position with the first position of the second position. Figure 3 As shown, determining the first emission flux may include steps 410 to 440, and each step will be described below.

[0089] In step 410, each first wind speed synchronously monitored by anemometers matching a plurality of sensors corresponding to each group of first positions is determined, and each first component wind speed of each first wind speed in a direction perpendicular to the moving direction of the mobile monitoring platform is determined.

[0090] In step 420, an average value of the first component wind speeds is obtained based on the first component wind speeds.

[0091] In step 430, the third column concentration monitored by the mobile monitoring platform corresponding to the current first position is determined.

[0092] In step 440, a first emission flux is determined based on the third column concentration, the first location, and the first component wind speed average.

[0093] In one embodiment, taking the embodiment described above as an example for illustration, and so on in sequence until the UAV VOCs sensor has no response at all column concentration monitoring point y positions (corresponding to the inability of multiple sensors corresponding to each group of first positions to monitor the first volatile organic compound concentration). In this scenario, the representative component wind speed value (corresponding to the average value of the first component wind speed) participating in the flux calculation is the average value of the component wind speed values monitored by the corresponding sensors at each position. That is, the first wind speeds synchronously monitored by the anemometers matched with the multiple sensors corresponding to each group of first positions are determined, and the first component wind speeds of the first wind speeds in the direction perpendicular to the movement direction of the mobile monitoring platform are determined. Then, based on the first component wind speeds, the average value of the first component wind speeds is obtained.

[0094] Further, based on the third column concentration, the first position, and the average value of the first component wind speed, the first emission flux is determined.

[0095] To further improve the accuracy of the first emission flux monitoring, the first emission flux can be monitored in multiple rounds, and based on the first emission fluxes obtained from the multiple rounds of monitoring, the final first emission flux is determined.

[0096] The process of obtaining the final first emission flux will be described below in combination with the following embodiments.

[0097] In an exemplary embodiment of the present invention, taking the embodiment described above as an example for illustration, after obtaining the first emission flux, the volatile organic compound emission flux determination method may further include the following steps: Figure 2 Taking the first emission flux as the first emission flux of the current round, and obtaining the first emission fluxes of multiple subsequent rounds of subsequent rounds of the current round, where

[0098] Before the process of determining the first emission flux of the subsequent round, the first UAV flight trajectory lines corresponding to the first emission fluxes of the subsequent rounds are respectively determined, where each first UAV flight trajectory line of the subsequent rounds is determined according to the first UAV flight trajectory line of the previous round;

[0099] Based on the first UAV flight trajectory lines of the subsequent rounds, multiple first emission fluxes of the subsequent rounds are determined according to the steps of determining the first emission flux;

[0100] The weight values of the first emission fluxes of the subsequent rounds are respectively determined;

[0101] Based on the first emission fluxes of the subsequent rounds and the corresponding weight values, the optimized first emission flux is determined, and the optimized first emission flux is used as the final first emission flux.

[0102] Based on the first emission fluxes of the subsequent rounds and the corresponding weight values, the optimized first emission flux is determined, and the optimized first emission flux is used as the final first emission flux.

[0103] In one embodiment, the first emission flux can be taken as the first emission flux (Flux 1 ) of the current round, and the first emission fluxes (Flux 2 ……Flux t ) of multiple subsequent rounds of the current round are obtained. It can be understood that in this embodiment, taking the example of obtaining the first emission fluxes of t rounds in total for illustration.

[0104] Furthermore, the weight values of the first emission fluxes of each subsequent round are determined respectively; and based on the first emission fluxes of each subsequent round and the corresponding weight values, the optimized first emission flux is determined, and the optimized first emission flux is taken as the final first emission flux.

[0105] In one embodiment, the optimized first emission flux can be expressed by the following formula (3):

[0106]

[0107] wherein, Flux T represents the optimized first emission flux, w 1 \(w 1 +w 2 +…+w n ) represents the weight value of Flux 1 ; w 2 \(w 1 +w 2 +…+w n ) represents the weight value of Flux 2 ……w n \(w 1 +w 2 +…+w n ) represents the weight value of Flux t .

[0108] In another exemplary embodiment of the present invention, the weight value can be determined in the following manner:

[0109] In the process of determining the first emission fluxes of each subsequent round, the weight value is determined according to the number of target monitoring sites monitored by the UAV monitoring platform, wherein,

[0110] The weight value is positively correlated with the number of target monitoring sites, and the number of target monitoring sites represents the difference between the number of positions of multiple groups of first positions obtained continuously and the number of invalid monitoring sites, wherein the invalid monitoring sites include the first position corresponding to the first state and the first position corresponding to the second state, and the first state indicates that each sensor has not monitored the first volatile organic compound concentration; the second state indicates that the first volatile organic compound concentration monitored by the sensor located at the edge among the multiple sensors is the highest and the first volatile organic compound concentrations monitored by other sensors adjacent to the sensor located at the edge decrease in sequence.

[0111] In one embodiment, the weight value may be positively correlated with the number of target monitoring sites, wherein the number of target monitoring sites represents the difference between the number of positions of the plurality of groups of first positions acquired continuously (which may correspond to the number of the parameter y mentioned above) and the number of invalid monitoring sites.

[0112] The invalid monitoring sites include a first position corresponding to the first state and a first position corresponding to the second state.

[0113] The first state may indicate that each sensor has not detected the first volatile organic compound concentration, that is, all the drone VOCs sensors corresponding to a column concentration monitoring point have no response.

[0114] The second state can represent that the concentration of the first volatile organic compound monitored by the sensor located at the edge among multiple sensors is the highest and the concentrations of the first volatile organic compound monitored by other sensors adjacent to the sensor located at the edge decrease successively, that is, the number of sensors with response values ​​corresponding to the drone VOCs sensor at a column concentration monitoring point is ≥ 1, and the value of the sensor at the edge is the highest, and the values ​​of adjacent sensors gradually decrease.

[0115] In another embodiment, the above-mentioned embodiment is used as an example for explanation. In the process of determining the first emission flux of the next round, the first UAV flight trajectory lines of the next round corresponding to the first emission flux of the next round can be determined respectively. The first UAV flight trajectory lines of each next round are determined according to the first UAV flight trajectory line of the previous round.

[0116] In another embodiment, the flight trajectory of the first UAV in the subsequent round can also be obtained according to the following method:

[0117] The highest points of VOCs concentration monitored by drones in the vertical direction corresponding to each column concentration monitoring point in all previous rounds are counted; the average height of the highest point of VOCs concentration in the vertical direction corresponding to the same column concentration monitoring point in each round is calculated; and the average height corresponding to each column concentration monitoring point is connected to obtain the flight trajectory line of the first drone in the subsequent round.

[0118] In yet another example, if there is no sensor response at the corresponding position of a certain column concentration monitoring point in a certain round, that is, when the UAV does not detect VOCs, the height value of the highest point of the VOCs concentration in the vertical direction corresponding to the column concentration monitoring point in that round does not exist.

[0119] In one example, the height corresponding to the highest point in the vertical concentration distribution of VOCs monitored by the UAV in the first synchronous monitoring can be obtained, and the average height of this height at the corresponding y position and the height of the first UAV flight trajectory line is taken. The points of all the average heights are connected to form the new movement trajectory of the UAV in the second synchronous monitoring, that is, the flight trajectory line of the first UAV in the subsequent rounds is obtained.

[0120] In yet another example, the height corresponding to the highest point in the vertical concentration distribution of VOCs monitored by the UAV in the second synchronous monitoring can be obtained, and the average height of this height at the corresponding y position and the heights of the previous two UAV movement trajectories is taken. The points of all the average heights are connected to form the new movement trajectory of the UAV in the third synchronous monitoring.

[0121] Furthermore, based on the flight trajectory line of the first UAV in the subsequent rounds, multiple first emission fluxes in the subsequent rounds can be determined according to the steps of determining the first emission flux. In other words, according to Figure 2 the steps shown, the Figure 2 flight trajectory line of the first UAV in step 210 in Figure 2 is replaced with the flight trajectory line of the first UAV in the subsequent rounds, and the steps in

[0122] are continued to be executed, and the first emission flux in the subsequent rounds can be obtained.

[0123] It should be noted that the method for determining the second emission flux is the same as that for determining the first emission flux, except that the parameters obtained upwind of the monitoring site are replaced with the parameters obtained downwind of the monitoring site. In this embodiment, the process of determining the second emission flux will not be elaborated.

[0124] The method for determining the volatile organic compound emission flux provided by the present invention can address the technical problem that when the current infrared occultation flux remote sensing monitoring technology monitors the fugitive emission flux of VOCs in industrial sites, the measurement uncertainty of the VOCs emission flux is relatively high due to the wind field measurement method. By improving the wind field measurement method, relatively accurate wind field data that actually drives the movement of the VOCs plume can be obtained, greatly reducing the problem that the overall flux measurement uncertainty is high in the existing SOF technology due to the high uncertainty of the wind field measurement.

[0125] Based on the same concept, the present invention also provides a device for determining the volatile organic compound emission flux.

[0126] The volatile organic compound emission flux determination device provided by the present invention will be described below. The volatile organic compound emission flux determination device described below can be correspondingly referred to the volatile organic compound emission flux determination method described above.

[0127] Figure 5 It is a schematic structural diagram of the volatile organic compound emission flux determination device provided by the present invention.

[0128] In an exemplary embodiment of the present invention, the volatile organic compound emission flux determination device can be applied to an emission flux monitoring system, and the emission flux monitoring system can include a mobile monitoring platform and an unmanned aerial vehicle (UAV) monitoring platform. Combining Figure 5 it can be known that the volatile organic compound emission flux determination device can include an acquisition module 510 and a processing module 520. Each module will be introduced separately below.

[0129] The acquisition module 510 can be configured to obtain the first emission fluxes of the target volatile organic compounds emitted by multiple emission sources in the upwind direction of the monitoring site, and the second emission fluxes of the target volatile organic compounds emitted by multiple emission sources in the downwind direction of the monitoring site, where

[0130] the first emission flux is determined according to the first UAV flight trajectory line, and the first UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the first column concentration of the target volatile organic compound is monitored in the upwind direction;

[0131] the second emission flux is determined according to the second UAV flight trajectory line, and the second UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the second column concentration of the target volatile organic compound is monitored in the downwind direction;

[0132] The processing module 520 can be configured to obtain the emission flux of the target volatile organic compound based on multiple groups of first emission fluxes and multiple groups of second emission fluxes.

[0133] In an exemplary embodiment of the present invention, the UAV monitoring platform is provided with sensors, and the acquisition module 510 can be implemented to obtain the first UAV flight trajectory line in the following manner:

[0134] When the first column concentration of the target volatile organic compound is monitored based on the infrared spectrometer provided in the mobile monitoring platform, determine the first ground position where the first column concentration is monitored;

[0135] Taking the first ground position as a reference, start the UAV monitoring platform to fly in a zigzag pattern in the vertical direction, and record the concentrations of multiple target volatile organic compounds based on sensors to obtain the spatial concentration distribution of the plume cross-section formed by the target volatile organic compounds. Among them, the abscissa of the spatial concentration distribution of the plume cross-section is the sampling point along the horizontal direction, and the ordinate is the concentrations of multiple target volatile organic compounds recorded by the sensors;

[0136] Based on the spatial concentration distribution of the plume cross-section, determine the position points where the highest concentrations of the target volatile organic compounds at each sampling point are located in the vertical direction;

[0137] Connect the position points where the highest concentrations of each target volatile organic compound are located in the vertical direction to obtain the first UAV flight trajectory line.

[0138] In an exemplary embodiment of the present invention, the UAV monitoring platform is provided with multiple sensors in the vertical direction. The acquisition module 510 can determine the first emission flux in the following manner:

[0139] Start the UAV monitoring platform to keep horizontal synchronous movement with the mobile monitoring platform;

[0140] When the emission source in the upwind direction of the monitoring site emits the target volatile organic compounds, when the mobile monitoring platform monitors the third column concentration of the target volatile organic compounds, adjust the flight altitude of the UAV monitoring platform, and make the height trajectory of the target sensor coincide with the first UAV flight trajectory line, where the target sensor is the sensor in the middle position among the multiple sensors;

[0141] Control the multiple sensors to synchronously monitor the first volatile organic compound concentration of the target volatile organic compounds, and synchronously monitor the first wind speed based on the multiple anemometers matched with the sensors arranged on the UAV monitoring platform;

[0142] Based on the first wind speed, obtain the first component wind speed of the first wind speed in the direction perpendicular to the movement direction of the mobile monitoring platform;

[0143] Obtain the first position of the emission flux monitoring system corresponding to the case of obtaining the third column concentration;

[0144] Based on the third column concentration, the first component wind speed, the first volatile organic compound concentration, and the first position, obtain the first emission flux.

[0145] In an exemplary embodiment of the present invention, during the process of monitoring the first emission flux, multiple groups of first positions are continuously obtained. In the case where the first volatile organic compound concentration cannot be monitored by any of the multiple sensors corresponding to the current first position, the acquisition module 510 can determine the first emission flux in the following manner:

[0146] In the case where the first volatile organic compound concentration is monitored by a plurality of sensors corresponding to a neighboring first position, determine the third column concentration monitored by the mobile monitoring platform corresponding to the current first position;

[0147] Determine the first volatile organic compound concentration monitored by a plurality of sensors corresponding to a neighboring first position, and

[0148] Determine the first wind speed synchronously monitored by an anemometer matched with a plurality of sensors corresponding to a neighboring first position, and determine the first component wind speed of the first wind speed in the direction perpendicular to the movement direction of the mobile monitoring platform;

[0149] Based on the third column concentration, the first position, the first volatile organic compound concentration, and the first component wind speed, determine the first emission flux, where the position distance difference between the neighboring first position and the current first position is less than or equal to the position distance difference threshold.

[0150] In an exemplary embodiment of the present invention, during the process of monitoring the first emission flux, multiple groups of first positions are continuously obtained. In the case where the first volatile organic compound concentration cannot be monitored by any of the plurality of sensors corresponding to each group of first positions, the acquisition module 510 may determine the first emission flux in the following manner:

[0151] Determine the first wind speeds synchronously monitored by anemometers matched with a plurality of sensors corresponding to each group of first positions, and determine the first component wind speeds of the first wind speeds in the direction perpendicular to the movement direction of the mobile monitoring platform for each;

[0152] Based on the first component wind speeds, obtain the average value of the first component wind speeds;

[0153] Determine the third column concentration monitored by the mobile monitoring platform corresponding to the current first position;

[0154] Based on the third column concentration, the first position, and the average value of the first component wind speeds, determine the first emission flux.

[0155] In an exemplary embodiment of the present invention, the determination module 510 may also be configured to:

[0156] Take the first emission flux as the first emission flux of the current round, and obtain the first emission fluxes of multiple subsequent rounds of the current round, where

[0157] Before the process of determining the first emission flux of the subsequent round, respectively determine the first UAV flight trajectory lines corresponding to the first emission fluxes of the subsequent rounds, where each first UAV flight trajectory line of the subsequent rounds is determined according to the first UAV flight trajectory line of the previous round;

[0158] Based on the flight trajectory line of the first drone in the subsequent rounds, determine multiple first emission fluxes in the subsequent rounds according to the steps of determining the first emission flux;

[0159] Determine the weight values of the first emission fluxes in each subsequent round respectively;

[0160] Based on the first emission fluxes in each subsequent round and the corresponding weight values, determine the optimized first emission flux, and use the optimized first emission flux as the final first emission flux.

[0161] In an exemplary embodiment of the present invention, the determining module 510 may also determine the weight value in the following manner:

[0162] During the process of determining the first emission fluxes in each subsequent round, determine the weight value according to the number of target monitoring sites monitored by the drone monitoring platform, where

[0163] The weight value is positively correlated with the number of target monitoring sites. The number of target monitoring sites represents the difference between the number of positions of multiple groups of first positions continuously obtained and the number of invalid monitoring sites. Among them, the invalid monitoring sites include the first positions corresponding to the first state and the first positions corresponding to the second state. The first state indicates that each sensor does not monitor the concentration of the first volatile organic compound; the second state indicates that the concentration of the first volatile organic compound monitored by the outermost sensor among the multiple sensors is the highest and the concentrations of the first volatile organic compounds monitored by other sensors adjacent to the outermost sensor decrease in sequence.

[0164] Figure 6 Illustrates a schematic diagram of the physical structure of an electronic device, such as Figure 6As shown in the figure, the electronic device may include: a processor 610, a communications interface 620, a memory 630, and a communication bus 640. Among them, the processor 610, the communications interface 620, and the memory 630 complete mutual communication through the communication bus 640. The processor 610 may call logic instructions in the memory 630 to execute a method for determining the emission flux of volatile organic compounds, which is applied to an emission flux monitoring system. The emission flux monitoring system includes a mobile monitoring platform and an unmanned aerial vehicle (UAV) monitoring platform. The method includes: obtaining a first emission flux of target volatile organic compounds emitted by multiple emission sources in the upwind direction of the monitoring site, and obtaining a second emission flux of the target volatile organic compounds emitted by multiple emission sources in the downwind direction of the monitoring site. Among them, the first emission flux is determined according to a first UAV flight trajectory line, and the first UAV flight trajectory line is determined based on the position of the highest concentration of the target volatile organic compound in the vertical direction when the first column concentration of the target volatile organic compound is detected in the upwind direction; the second emission flux is determined according to a second UAV flight trajectory line, and the second UAV flight trajectory line is determined based on the position of the highest concentration of the target volatile organic compound in the vertical direction when the second column concentration of the target volatile organic compound is detected in the downwind direction; based on multiple groups of the first emission flux and multiple groups of the second emission flux, the emission flux of the target volatile organic compound is obtained.

[0165] In addition, when the logic instructions in the above-mentioned memory 630 are implemented in the form of software functional units and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, may be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disc that can store program codes.

[0166] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the volatile organic compound emission flux determination method provided by each of the above methods, which is applied to an emission flux monitoring system. The emission flux monitoring system includes a mobile monitoring platform and an unmanned aerial vehicle (UAV) monitoring platform. The method includes: obtaining a first emission flux of a target volatile organic compound emitted by multiple emission sources in the upwind direction of the monitoring site, and obtaining a second emission flux of the target volatile organic compound emitted by multiple emission sources in the downwind direction of the monitoring site. Among them, the first emission flux is determined according to a first UAV flight trajectory line, and the first UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the first column concentration of the target volatile organic compound is detected in the upwind direction; the second emission flux is determined according to a second UAV flight trajectory line, and the second UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the second column concentration of the target volatile organic compound is detected in the downwind direction; based on multiple groups of the first emission fluxes and multiple groups of the second emission fluxes, the emission flux of the target volatile organic compound is obtained.

[0167] In another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is configured to execute the volatile organic compound emission flux determination method provided by each of the above methods, which is applied to an emission flux monitoring system. The emission flux monitoring system includes a mobile monitoring platform and an unmanned aerial vehicle (UAV) monitoring platform. The method includes: obtaining a first emission flux of a target volatile organic compound emitted by multiple emission sources in the upwind direction of the monitoring site, and obtaining a second emission flux of the target volatile organic compound emitted by multiple emission sources in the downwind direction of the monitoring site. Among them, the first emission flux is determined according to a first UAV flight trajectory line, and the first UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the first column concentration of the target volatile organic compound is detected in the upwind direction; the second emission flux is determined according to a second UAV flight trajectory line, and the second UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the second column concentration of the target volatile organic compound is detected in the downwind direction; based on multiple groups of the first emission fluxes and multiple groups of the second emission fluxes, the emission flux of the target volatile organic compound is obtained.

[0168] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative effort.

[0169] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0170] It can be further understood that although the operations are described in a specific order in the drawings in the embodiments of the present invention, it should not be understood as requiring to execute these operations in the specific order shown or in a serial order, or requiring to execute all the operations shown to obtain the desired result. In a specific environment, multitasking and parallel processing may be beneficial.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining the emission flux of volatile organic compounds, characterized in that, it is applied to an emission flux monitoring system, the emission flux monitoring system includes a mobile monitoring platform and an unmanned aerial vehicle (UAV) monitoring platform, and the method includes: Obtaining multiple sets of the first emission fluxes of the target volatile organic compounds emitted by emission sources in the upwind direction of the monitoring site, and obtaining multiple sets of the second emission fluxes of the target volatile organic compounds emitted by emission sources in the downwind direction of the monitoring site, wherein, the first emission flux is determined according to the first UAV flight trajectory line, and the first UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the first column concentration of the target volatile organic compound is detected in the upwind direction; the second emission flux is determined according to the second UAV flight trajectory line, and the second UAV flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction is located when the second column concentration of the target volatile organic compound is detected in the downwind direction; Based on multiple sets of the first emission fluxes and multiple sets of the second emission fluxes, the emission flux of the target volatile organic compound is obtained.

2. The method for determining the emission flux of volatile organic compounds according to claim 1, characterized in that, the UAV monitoring platform is provided with sensors, and the first UAV flight trajectory line is obtained by the following method: When the first column concentration of the target volatile organic compound is detected based on the infrared spectrometer provided in the mobile monitoring platform, determining the first ground position where the first column concentration is detected; Taking the first ground position as a reference, starting the UAV monitoring platform to fly in a Z-shaped pattern in the vertical direction, and recording the concentrations of multiple target volatile organic compounds based on the sensors to obtain the spatial concentration distribution of the plume cross-section of the target volatile organic compound forming a plume, wherein the abscissa of the spatial concentration distribution of the plume cross-section is the sampling point along the horizontal direction, and the ordinate is the concentrations of multiple target volatile organic compounds recorded by the sensors; Based on the spatial concentration distribution of the plume cross-section, determining the position points where the highest concentrations of the target volatile organic compounds in the vertical direction are located at each sampling point; Connecting the position points where the highest concentrations of the target volatile organic compounds in the vertical direction are located to obtain the first UAV flight trajectory line.

3. The method for determining the emission flux of volatile organic compounds according to claim 1 or 2, characterized in that, the UAV monitoring platform is provided with multiple sensors in the vertical direction, and the first emission flux is determined by the following method: Starting the UAV monitoring platform to keep horizontal synchronous movement with the mobile monitoring platform; When the emission source upwind of the monitoring site emits the target volatile organic compounds, when the mobile monitoring platform monitors the third column concentration of the target volatile organic compounds, adjust the flight altitude of the unmanned aerial vehicle (UAV) monitoring platform, and make the height trajectory of the target sensor coincide with the first UAV flight trajectory line, where the target sensor is the sensor in the middle position among the multiple sensors; Control the multiple sensors to synchronously monitor the first volatile organic compound concentration of the target volatile organic compounds, and synchronously monitor the first wind speed based on the multiple anemometers arranged on the UAV monitoring platform and matched with the sensors; Based on the first wind speed, obtain the first component wind speed of the first wind speed in the direction perpendicular to the movement direction of the mobile monitoring platform; Obtain the first position of the emission flux monitoring system corresponding to the case where the third column concentration is obtained; Based on the third column concentration, the first component wind speed, the first volatile organic compound concentration, and the first position, obtain the first emission flux.

4. The method for determining the emission flux of volatile organic compounds according to claim 3, wherein, During the process of monitoring the first emission flux, continuously obtain multiple groups of the first positions. In the case where the first volatile organic compound concentration cannot be monitored by any of the multiple sensors corresponding to the current first position, the first emission flux is determined in the following manner: In the case where the first volatile organic compound concentration is monitored by the multiple sensors corresponding to the adjacent first position, determine the third column concentration monitored by the mobile monitoring platform corresponding to the current first position; Determine the first volatile organic compound concentration monitored by the multiple sensors corresponding to the adjacent first position, and Determine the first wind speed synchronously monitored by the anemometers matched with the multiple sensors corresponding to the adjacent first position, and determine the first component wind speed of the first wind speed in the direction perpendicular to the movement direction of the mobile monitoring platform; Based on the third column concentration, the first position, the first volatile organic compound concentration, and the first component wind speed, determine the first emission flux, where the position distance difference between the adjacent first position and the current first position is less than or equal to the position distance difference threshold.

5. The method for determining the emission flux of volatile organic compounds according to claim 3, wherein, During the process of monitoring the first emission flux, continuously obtain multiple groups of the first positions. In the case where the first volatile organic compound concentration cannot be monitored by any of the multiple sensors corresponding to each group of the first positions, the first emission flux is determined in the following manner: Determine the respective first wind speeds synchronously monitored by the anemometers matched with the multiple sensors corresponding to each group of the first positions, and determine the respective first component wind speeds of the respective first wind speeds in the direction perpendicular to the movement direction of the mobile monitoring platform; Based on the respective first component wind speeds, obtain the average value of the first component wind speeds; Determine the third column concentration monitored by the mobile monitoring platform corresponding to the current first position; Determine the first emission flux based on the third column concentration, the first position, and the average value of the first component wind speed.

6. The method for determining the volatile organic compound emission flux according to claim 3, wherein, after obtaining the first emission flux, the method further includes: Regarding the first emission flux as the first emission flux of the current round, and obtaining the first emission fluxes of multiple subsequent rounds of the current round, wherein, before determining the first emission fluxes of the subsequent rounds, respectively determine the first drone flight trajectory lines corresponding to the first emission fluxes of the subsequent rounds, wherein each of the first drone flight trajectory lines of the subsequent rounds is determined according to the first drone flight trajectory line of the previous round; Based on the first drone flight trajectory lines of the subsequent rounds, determine multiple first emission fluxes of the subsequent rounds according to the steps of determining the first emission flux; Respectively determine the weight values of each of the first emission fluxes of the subsequent rounds; Based on each of the first emission fluxes of the subsequent rounds and the corresponding weight values, determine the optimized first emission flux, and regard the optimized first emission flux as the final first emission flux.

7. The method for determining the volatile organic compound emission flux according to claim 6, wherein, the weight value is determined in the following manner: During the process of determining each of the first emission fluxes of the subsequent rounds, determine the weight value according to the number of target monitoring sites monitored by the drone monitoring platform, wherein, the weight value is positively correlated with the number of target monitoring sites, and the number of target monitoring sites represents the difference between the number of positions of multiple groups of the first positions continuously obtained and the number of invalid monitoring sites. The invalid monitoring sites include the first positions corresponding to the first state and the first positions corresponding to the second state. The first state indicates that each of the sensors does not monitor the first volatile organic compound concentration; the second state indicates that the first volatile organic compound concentration monitored by the outermost sensor among multiple sensors is the highest and the first volatile organic compound concentrations monitored by other sensors adjacent to the outermost sensor decrease in sequence.

8. A device for determining the volatile organic compound emission flux, wherein, applied to an emission flux monitoring system, the emission flux monitoring system includes a mobile monitoring platform and a drone monitoring platform, and the device includes: An acquisition module, configured to acquire the first emission fluxes of the target volatile organic compounds emitted by multiple emission sources in the upwind direction of the monitoring site, and acquire the second emission fluxes of the target volatile organic compounds emitted by multiple emission sources in the downwind direction of the monitoring site, wherein, the first emission flux is determined according to the first drone flight trajectory line, and the first drone flight trajectory line is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction exists when the first column concentration of the target volatile organic compound is monitored in the upwind direction; The second emission flux is determined according to the flight trajectory line of the second unmanned aerial vehicle. The flight trajectory line of the second unmanned aerial vehicle is determined based on the position where the highest concentration of the target volatile organic compound in the vertical direction exists under the condition that the second column concentration of the target volatile organic compound is monitored in the downwind direction. A processing module, configured to obtain the emission flux of the target volatile organic compound based on multiple groups of the first emission flux and multiple groups of the second emission flux.

9. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein, when the processor executes the program, the method for determining the emission flux of volatile organic compounds according to any one of claims 1 to 7 is implemented.

10. A non-transitory computer-readable storage medium, on which a computer program is stored, wherein, when the computer program is executed by the processor, the method for determining the emission flux of volatile organic compounds according to any one of claims 1 to 7 is implemented.

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