A shipboard marine aerosol monitoring platform apparatus and method of use

Abstract

The application discloses a kind of shipborne marine aerosol monitoring platform device and use method, platform device includes ship body, monitoring cavity is equipped on the deck of ship body, the outlet end of gas inlet pipe is vertically extended from the top end of monitoring cavity into monitoring cavity, laser diode is fixed in the right part of monitoring cavity, probe diode is fixed in the upper part of monitoring cavity and scattering mirror is fixed in the lower part, laser diode is used to emit laser to aerosol particle in air sample, scattering mirror is used to reflect the scattering light emitted by aerosol particle under the action of laser to probe diode, probe diode is used to receive scattering light and convert into electric pulse, and the number of aerosol particles in certain particle size section in air sample in monitoring cavity in certain time period is calculated.The application can obtain the number concentration of aerosol particles in open sea moving air source, and the spatial resolution of monitored aerosol particle number concentration is higher.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of atmospheric detection equipment, and particularly relates to a shipborne marine aerosol monitoring platform device and a use method. BACKGROUND

[0002] Aerosol is a solid and liquid particle with stability, sedimentation and scale range of 0.001-100 mu m suspended in the atmosphere, which changes the cloud microphysical properties through direct interaction with solar radiation. Precipitation cycle and monsoon transmission continuously affect the earth's climate change. In the trend of global warming, aerosol flux concentration and particle size observation is increasingly important. Aerosol emission from the ocean is one of the main natural sources of aerosol in the atmosphere, accounting for almost 30% of the total global aerosol. Due to the different locations of the sea, the sources of aerosol are different. In addition, the atmospheric conditions change dramatically and the aerosol is transported over a long distance on land, which is disturbed by factors such as sea surface wind speed, wave height, atmospheric stability and sea surface temperature. The emission flux of marine aerosol and its dependence on various factors have not been universally agreed upon. At the same time, the uncertainty of the source and composition of aerosol means that the number concentration and mass concentration of aerosol in the marine atmosphere are uncertain. Due to the serious restrictions of sea conditions and natural conditions, it is difficult to accurately evaluate the number concentration and mass concentration of aerosol through laboratory and numerical simulation means, and only rough evaluation can be made through field observation means.

[0003] However, the commonly used marine aerosol observation instruments at present, such as actinometers, can only give single-point measurement or atmospheric layer integration aerosol data, which has poor space-time representativeness. Aerosol particle size spectrometers have low integration, and are mostly suitable for land environment, with poor marine applicability. Although single-particle aerosol mass spectrometers can greatly improve the observation accuracy, they are expensive and difficult to be widely used in marine aerosol observation.

[0004] Limited by observation conditions, current marine aerosol observation is basically limited to coastal or island station observation, buoy observation and remote sensing observation, which has practical difficulties such as inability to obtain aerosol information in open sea mobile air source, low spatial resolution and accuracy of monitored aerosol information, and incomplete acquisition of aerosol microphysical property parameters. SUMMARY

[0005] In view of the defects of the prior art, the application provides a shipborne marine aerosol monitoring platform device and a use method, which can obtain the number concentration of aerosol particles in the open sea mobile air source, and has high spatial resolution of the monitored aerosol particle number concentration.

[0006] The technical scheme adopted by the application to solve the technical problems is:

[0007] The application discloses a marine aerosol monitoring platform device, which comprises a ship body sailing in a sea area, and an aerosol multi-channel number concentration monitoring unit is fixed on a deck of the ship body. The aerosol multi-channel number concentration monitoring unit comprises a monitoring cavity, an air inlet pipe and an air outlet. An air inlet pump is arranged on the air inlet pipe. An air outlet end of the air inlet pipe vertically extends into the monitoring cavity from a top end of the monitoring cavity. A laser diode is fixed in a right part of the monitoring cavity. A laser emission direction of the laser diode is perpendicular to a flow direction of an air sample entering the monitoring cavity. A detector diode is fixed in an upper part of the monitoring cavity, and a scattering mirror is fixed in a lower part of the monitoring cavity. The laser diode is used for emitting laser to aerosol particles in the air sample. The scattering mirror is used for reflecting scattering light emitted by the aerosol particles under the action of the laser to the detector diode. The detector diode is used for receiving the scattering light and converting the scattering light into an electric pulse. The number concentration of the aerosol particles in the air sample in a certain particle size section in a certain time period entering the monitoring cavity is calculated, and the number concentration of the aerosol particles in the air sample is obtained.

[0008] Further, the detector diode is used for monitoring the intensity of the received scattering light signal and converting the scattering light signal into an electric pulse. The particle size of the aerosol particles is proportional to the intensity of the scattering light signal, and the height of the electric pulse is proportional to the particle size of the aerosol particles. The detector diode is used for monitoring the number of the aerosol particles in a corresponding particle size section in 45 particle size sections in the range of 0.25-10 mu m in a certain time period.

[0009] Further, the detector diode is located at a position vertically above the scattering mirror. The air inlet pipe is vertically arranged and located at a position vertically above the detector diode. The scattering mirror is in an arc shape, and an arc center angle of the scattering mirror is 60 degrees.

[0010] Further, a monitoring box body is fixed on the deck of the ship body at an upwind position of a ship oil and gas discharge channel. The aerosol multi-channel number concentration monitoring unit is arranged in the monitoring box body. An air inlet end of the air inlet pipe is located outside the monitoring box body. A drier is further arranged on the air inlet pipe.

[0011] Further, the exhaust port is arranged at the bottom end of the monitoring cavity, and an exhaust pipe is connected to the exhaust port, wherein a flow meter is arranged on the exhaust pipe, and an exhaust end of the exhaust pipe is arranged outside the monitoring box; an aerosol multi-channel mass concentration monitoring unit is further arranged in the monitoring box, and the aerosol multi-channel mass concentration monitoring unit comprises a data storage module and a data processing module; the signal output end of the detector diode and the flow meter are in communication connection with the data storage module; the data storage module is in communication connection with the data processing module; the detector diode is used to send the calculated aerosol particle number data in a certain particle size range in the air sample entering the monitoring cavity within a certain time period to the data storage module; the flow meter is used to send the monitored flow data of the air sample in the exhaust pipe to the data storage module; and the data processing module is used to calculate the mass concentration of the aerosol particles in a certain particle size range in the air sample within a certain time period according to the data stored in the data storage module.

[0012] Further, the bottom plate of the monitoring box is provided with a heat dissipation exhaust hole, so that the monitoring box is in communication with the outside atmosphere.

[0013] Further, a temperature probe and a relative humidity probe are further arranged outside the monitoring box; the temperature probe is used to monitor the temperature of the outside atmosphere; the relative humidity probe is used to monitor the relative humidity of the outside atmosphere; the signal output end of the detector diode, the temperature probe and the relative humidity probe are in communication connection with an aerosol data quality control module; the aerosol data quality control module is used to correct the calculated aerosol particle number in a certain particle size range in the air sample entering the monitoring cavity within a certain time period according to the received aerosol particle number data in a certain particle size range in the air sample entering the monitoring cavity within a certain time period, the temperature data and the relative humidity data of the outside atmosphere, and according to the hygroscopicity of the aerosol to evaluate the growth rate of the aerosol particles.

[0014] Further, an automatic weather monitoring module is further arranged outside the monitoring box, which is used to monitor the relative wind direction and the relative wind speed above 10 meters on the deck of the ship in real time; the signal output end of the automatic weather monitoring module is in communication connection with the aerosol data quality control module; and the aerosol data quality control module is used to exclude the aerosol particle number data in a certain particle size range in the air sample entering the monitoring cavity within a certain time period when the angle difference between the relative wind direction and the direction of the ship is within the range of 110-260°, and to exclude the aerosol particle number data in a certain particle size range in the air sample entering the monitoring cavity within a certain time period when the relative wind speed is less than 2 meters / second.

[0015] Further, the aerosol data quality control module is used to analyze the aerosol particle number data in a certain particle size section of the air sample entering the monitoring cavity within a certain time period, and exclude the aerosol particle number concentration data in the time period corresponding to the sharp increase or decrease of the aerosol particle number in a certain particle size section of the air sample entering the monitoring cavity within a short time without the influence of land transmission effect and meteorological condition change.

[0016] A method for using the ship-borne marine aerosol monitoring platform device, specifically: starting the air inlet pump to draw the ambient air above the sea area where the ship body is located into the monitoring cavity through the air inlet pipe and form an air sample, the laser diode emits laser to the aerosol particles in the air sample flowing vertically downward into the monitoring cavity, the aerosol particles emit scattering light under the action of laser and irradiate on the scattering mirror, the scattering mirror reflects the scattering light to the detector diode, the detector diode converts the received scattering light into electric pulses, and the number of aerosol particles in a certain particle size section of the air sample entering the monitoring cavity within a certain time period is calculated, and the number concentration of aerosol particles in the air sample is obtained.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] The ship-borne marine aerosol monitoring platform device of the present application, when monitoring marine aerosol, starts the air inlet pump to draw the ambient air above the sea area where the ship body is located into the monitoring cavity through the air inlet pipe and form an air sample, the laser diode emits laser to the aerosol particles in the air sample flowing vertically downward into the monitoring cavity, the aerosol particles emit scattering light under the action of laser and irradiate on the scattering mirror, the scattering mirror reflects the scattering light to the detector diode, the detector diode converts the received scattering light into electric pulses, and the number of aerosol particles in a certain particle size section of the air sample entering the monitoring cavity within a certain time period is calculated, and the number concentration of aerosol particles in the air sample is obtained; since the aerosol multi-channel number concentration monitoring unit is fixed on the deck of the ship body, and the ship body sails in the sea area, the aerosol multi-channel number concentration monitoring unit can sail in the sea area with the ship body, and thus the number concentration of aerosol particles in the open sea moving air source can be obtained through the aerosol multi-channel number concentration monitoring unit, and since the position of the sea area where the ship body is located is different, the number concentration of aerosol particles in the ambient air above the sea area is different, so that the spatial resolution of the monitored number concentration of aerosol particles is higher through the ship-borne marine aerosol monitoring platform device of the present application, and in addition, the number concentration of aerosol particles in the ambient air above the sea area can be monitored only by starting the air inlet pump, so that the monitoring frequency of marine aerosol can be improved and the monitoring difficulty can be reduced.

[0019] In the application, the probe diode is used for monitoring the intensity of the received scattered light signal and converting into an electric pulse, wherein the particle size of the aerosol particle is proportional to the intensity of the scattered light signal, and the height of the electric pulse is proportional to the particle size of the aerosol particle, and the probe diode is used for monitoring the number of aerosol particles in the corresponding particle size range in the 45 particle size ranges of 0.25-10 μm within a certain time period; thus, through the shipborne marine aerosol monitoring platform device of the application, the number of aerosol particles in the corresponding particle size range in the 45 particle size ranges in the ambient air above the sea area can be monitored, and therefore the application can provide the particle size and number concentration information of the aerosol particles in dozens of particle size ranges.

[0020] In the application, the exhaust port is arranged at the bottom end of the monitoring cavity, the exhaust pipe is connected to the exhaust port, the flow meter is arranged on the exhaust pipe, and the exhaust end of the exhaust pipe is outside the monitoring box. The monitoring box further comprises an aerosol multi-channel mass concentration monitoring unit, which comprises a data storage module and a data processing module. The signal output end of the probe diode and the flow meter are in communication connection with the data storage module, and the data storage module is in communication connection with the data processing module. The probe diode is used for sending the calculated number of aerosol particles in a certain particle size range in the air sample entering the monitoring cavity within a certain time period to the data storage module, the flow meter is used for sending the monitored flow data of the air sample in the exhaust pipe to the data storage module, and the data processing module is used for calculating the mass concentration of the aerosol particles in a certain particle size range in the air sample within a certain time period according to the data stored in the data storage module. Thus, the mass concentration of the aerosol particles in the open sea moving air source can be obtained through the aerosol multi-channel mass concentration monitoring unit, and the acquisition of the aerosol microphysical characteristic parameters is comprehensive.

[0021] In the application, a temperature probe and a relative humidity probe are further installed outside the monitoring box. The temperature probe is used for monitoring the temperature of the external atmosphere, and the relative humidity probe is used for monitoring the relative humidity of the external atmosphere. The signal output end of the probe diode, the temperature probe and the relative humidity probe are in communication connection with the aerosol data quality control module. The aerosol data quality control module is used for correcting the calculated number of aerosol particles in a certain particle size range in the air sample entering the monitoring cavity within a certain time period according to the received number of aerosol particles in a certain particle size range in the air sample entering the monitoring cavity within a certain time period, the temperature data and the relative humidity data of the external atmosphere, and the growth rate of the aerosol particles according to the hygroscopicity of the aerosol. Thus, the influence of the temperature and the relative humidity on the monitored number of aerosol particles in a certain particle size range can be excluded, and the monitoring accuracy of the number concentration of the aerosol particles can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the shipborne marine aerosol monitoring platform device of the present application.

[0023] Figure 2 It is a schematic diagram of the scattered light emitted by aerosol particles under the action of laser irradiating the scattering mirror.

[0024] Figure 3 It is a control flowchart for monitoring the mass concentration of aerosol particles by the aerosol multi-channel mass concentration monitoring unit.

[0025] Figure 4 It is a control flowchart for controlling the monitoring precision of the number concentration of aerosol particles by the aerosol data quality control module.

[0026] In the figure, the reference signs are explained as follows: 1, deck, 2, monitoring cavity, 3, air inlet pipe, 4, laser diode, 5, detector diode, 6, scattering mirror, 7, monitoring box, 8, air outlet pipe, 9, aerosol particles, 10, ambient air. DETAILED DESCRIPTION

[0027] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate the present application, and are not a limitation on the present application.

[0028] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] As Figure 1As shown in the figure, a kind of marine aerosol monitoring platform device of ship-borne, including the hull that sails in sea area, the deck 1 of hull is fixed with aerosol multi-channel number concentration monitoring unit, aerosol multi-channel number concentration monitoring unit includes monitoring cavity 2, air inlet pipe 3 and exhaust port, air inlet pump is arranged on air inlet pipe 3, the air outlet end of air inlet pipe 3 is vertically extended from the top end of monitoring cavity 2 into monitoring cavity 2, laser diode 4 is fixed in the right part in monitoring cavity 2, the laser emission direction of laser diode 4 is perpendicular to the flow direction of air sample into monitoring cavity 2, probe diode 5 is fixed in the upper part in monitoring cavity 2 and scattering mirror 6 is fixed in the lower part, as shown in the figure Figure 2 As shown in the figure, laser diode 4 is used to emit laser with wavelength of visible light band to aerosol particles 9 in air sample, scattering mirror 6 is used to reflect the scattering light emitted by aerosol particles 9 under the action of laser to probe diode 5, probe diode 5 is used to receive scattering light and convert it into electric pulse, and the number of aerosol particles in certain particle size section in air sample into monitoring cavity 2 in certain time period is calculated, and the number concentration of aerosol particles in air sample is obtained, so the number concentration spectrum distribution diagram of aerosol particles can be obtained by monitoring the number of aerosol particles in certain particle size section. Wherein probe diode 5 is located at the position directly above scattering mirror 6, air inlet pipe 3 is vertically and located at the position directly above probe diode 5, wherein scattering mirror 6 is arc-shaped and the central angle of arc is 60 °.

[0031] When monitoring marine aerosol, air inlet pump is started, to suck the ambient air 10 above the sea area where the hull is located into monitoring cavity 2 through air inlet pipe 3 and form air sample, laser diode 4 emits laser to aerosol particles 9 in the vertically downward flowing air sample into monitoring cavity 2, aerosol particles 9 emit scattering light under the action of laser and irradiate on scattering mirror 6, scattering mirror 6 reflects the scattering light to probe diode 5, probe diode 5 converts the received scattering light into electric pulse, and the number of aerosol particles in certain particle size section in air sample into monitoring cavity 2 in certain time period is calculated, and the number concentration of aerosol particles in air sample is obtained; Since aerosol multi-channel number concentration monitoring unit is fixed on the deck 1 of hull, and the hull sails in sea area, so aerosol multi-channel number concentration monitoring unit can sail in sea area with the hull, and then the number concentration of aerosol particles in open sea moving air source can be obtained by aerosol multi-channel number concentration monitoring unit, and since the position of sea area where the hull is located is different, the number concentration of aerosol particles in ambient air 10 above sea area is different, so the spatial resolution of the number concentration of monitored aerosol particles is higher by the marine aerosol monitoring platform device of ship-borne of the application, and the number concentration of aerosol particles in ambient air 10 above sea area can be monitored only by starting air inlet pump, so the monitoring frequency of marine aerosol can be improved and the monitoring difficulty can be reduced.

[0032] The detector diode 5 is used to monitor the intensity of the received scattered light signal and convert it into an electric pulse, wherein the particle size of the aerosol particles is proportional to the intensity of the scattered light signal, and the height of the electric pulse is proportional to the particle size of the aerosol particles, and the detector diode 5 is used to monitor the number of aerosol particles in the corresponding particle size range in the 45 particle size ranges in the range of 0.25-10 μm within a certain period of time, wherein the 45 particle size ranges in the range of 0.25-10 μm cover all particle size ranges of aerosol Ragen nuclei, large nuclei and giant nuclei. Thus, by using the shipborne marine aerosol monitoring platform device of the present application, the number of aerosol particles in the corresponding particle size range in the 45 particle size ranges in the ambient air 10 above the sea area can be monitored, and therefore the present application can provide information on the particle size and number concentration of aerosol particles 9 in dozens of particle size ranges.

[0033] The intensity of the scattered light signal is not only affected by the particle size of the aerosol particles, but also affected by the refractive index of the aerosol particles 9 and the shape of the aerosol particles 9, and since the laser emission direction of the laser diode 4 is perpendicular to the flow direction of the air sample into the monitoring cavity 2, the influence of the refractive index of the aerosol particles 9 on the intensity of the scattered light signal is minimized.

[0034] In one embodiment, the monitoring box 7 is fixed on the deck 1 of the ship body at a position upwind of the oil and gas discharge channel of the ship body, and the arrangement distance of the monitoring box 7 from the bow of the ship under the condition of meeting the operation of the ship is determined according to the ratio of the length of the bow to the stern to the length of the oil and gas discharge channel to the stern, wherein the aerosol multi-channel number concentration monitoring unit is arranged in the monitoring box 7, the air inlet end of the air inlet pipe 3 is outside the monitoring box 7, and a dryer is further arranged on the air inlet pipe 3, wherein the dryer can dry the air sample entering the monitoring cavity 2; the bottom plate of the monitoring box 7 is provided with a heat dissipation exhaust hole, so that the monitoring box 7 is in communication with the outside atmosphere.

[0035] In one embodiment, the exhaust port is arranged at the bottom end of the monitoring cavity 2, and the exhaust pipe 8 is connected to the exhaust port, the flow meter is arranged on the exhaust pipe 8, and the exhaust end of the exhaust pipe 8 is outside the monitoring box 7, and the aerosol multi-channel mass concentration monitoring unit is further arranged in the monitoring box 7, which includes a data storage module and a data processing module, as Figure 3As shown in the figure, the signal output end of the probe diode 5 and the flow meter are both in communication connection with the data storage module, the data storage module is in communication connection with the data processing module, the probe diode 5 is used to send the calculated number of aerosol particles in a certain size range in the air sample entering the monitoring cavity 2 within a certain period of time to the data storage module, the flow meter is used to send the monitored flow data of the air sample in the exhaust pipe 8 to the data storage module, and the data processing module is used to calculate the mass concentration of the aerosol particles in a certain size range in the air sample within a certain period of time according to the data stored in the data storage module. In this way, the mass concentration of the aerosol particles in the moving air source of the open sea can be obtained by the aerosol multi-channel mass concentration monitoring unit, and therefore the aerosol microphysical property parameters can be comprehensively obtained. The data storage module is a memory, and the data processing module is a computer host.

[0036] wherein it is assumed that the density of the carbonaceous aerosol is ρ μg / m 3 , the number of aerosol particles in a certain size range in the air sample entering the monitoring cavity 2 within a certain period of time is n, the volume of the air sample entering the monitoring cavity 2 within a certain period of time is V / m 3 , the flow of the air sample in the exhaust pipe 8 monitored by the flow meter is Q, and the sampling time corresponding to a certain period of time is t, then V=Q×t, and the mass concentration of the aerosol particles in a certain size range in the air sample within a certain period of time is m, then m=[ρ(μg / m 3 )×1m 3 ×n]÷V(m 3 ).

[0037] In one embodiment, a temperature probe and a relative humidity probe are also installed outside the monitoring box 7, the temperature probe is used to monitor the temperature of the external atmosphere, and the relative humidity probe is used to monitor the relative humidity of the external atmosphere, as shown in the figure. Figure 4 As shown in the figure, the signal output end of the probe diode 5, the temperature probe and the relative humidity probe are all in communication connection with the aerosol data quality control module, the aerosol data quality control module is used to correct the calculated number of aerosol particles in a certain size range in the air sample entering the monitoring cavity 2 within a certain period of time according to the received number of aerosol particles in a certain size range in the air sample entering the monitoring cavity 2 within a certain period of time, the temperature data and the relative humidity data of the external atmosphere, and evaluate the growth ratio of the aerosol particles according to the hygroscopicity of the aerosol. In this way, the influence of temperature and relative humidity on the monitored number of aerosol particles in a certain size range can be excluded, and the monitoring accuracy of the number concentration of the aerosol particles 9 can be improved, and therefore the monitoring accuracy of the mass concentration of the aerosol particles 9 can be improved. The aerosol data quality control module is a PLC controller.

[0038] In one embodiment, the outer side of the monitoring box 7 is also provided with an automatic meteorological monitoring module for monitoring the relative wind direction and relative wind speed above 10 meters on the hull deck 1 in real time. Figure 4 As shown, the signal output end of the automatic meteorological monitoring module is in communication connection with the aerosol data quality control module, and the aerosol data quality control module is used to exclude the aerosol particle number data in a certain particle size section in the air sample entering the monitoring cavity 2 within a time period when the angle difference between the relative wind direction and the hull direction is within the range of 110-260° according to the received relative wind direction and relative wind speed data above 10 meters on the hull deck 1, so as to eliminate the influence of the ship emission oil gas on part of the aerosol in the environmental air 10 above the sea area around the ship, and to exclude the aerosol particle number data in a certain particle size section in the air sample entering the monitoring cavity 2 within a time period when the relative wind speed is less than 2 meters / second, so as to prevent the influence of the local turbulence formed by the ship oil gas emission on the aerosol in the environmental air 10 above the sea area around the ship during the relative static period.

[0039] The aerosol data quality control module is used to analyze the aerosol particle number data in a certain particle size section in the air sample entering the monitoring cavity 2 within a certain time period, and to exclude the aerosol particle number concentration data in a time period corresponding to a sharp increase or decrease of the aerosol particle number in a certain particle size section in the air sample entering the monitoring cavity 2 within a short time without land transmission effect and meteorological condition change, so as to screen out the influence of the ship itself on the aerosol in the environmental air 10 above the sea area around the ship.

[0040] A use method of a shipborne marine aerosol monitoring platform device, in particular:

[0041] Start the air inlet pump to draw the environmental air 10 above the sea area where the ship is located into the monitoring cavity 2 through the air inlet pipe 3 and form an air sample, the laser diode 4 emits laser to the aerosol particles 9 in the air sample flowing vertically downward into the monitoring cavity 2, the aerosol particles 9 emit scattering light under the action of the laser and irradiate onto the scattering mirror 6, the scattering mirror 6 reflects the scattering light onto the detector diode 5, the detector diode 5 converts the received scattering light into electric pulses, and the number of aerosol particles in a certain particle size section in the air sample entering the monitoring cavity 2 within a certain time period is calculated, and the number concentration of the aerosol particles in the air sample is obtained.

[0042] And the probe diode 5 will send the calculated number of aerosol particles in a certain size range in the air sample into the monitoring cavity 2 within a certain period of time to the data storage module, and the flow meter will send the monitored flow data of the air sample in the exhaust pipe 8 to the data storage module, and the data processing module will calculate the mass concentration of the aerosol particles in a certain size range in the air sample within a certain period of time according to the data stored in the data storage module.

[0043] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A shipborne marine aerosol monitoring platform device, characterized in that: The system includes a ship navigating in the sea. An aerosol multi-channel quantity concentration monitoring unit is fixed on the deck (1) of the ship. The aerosol multi-channel quantity concentration monitoring unit includes a monitoring cavity (2), an air inlet pipe (3), and an exhaust port. An air inlet pump is installed on the air inlet pipe (3). The exhaust end of the air inlet pipe (3) extends vertically from the top of the monitoring cavity (2) into the monitoring cavity (2). A laser diode (4) is fixed on the right side of the monitoring cavity (2). The laser emission direction of the laser diode (4) is perpendicular to the flow direction of the air sample entering the monitoring cavity (2). (2) A detector diode (5) is fixed in the upper part and a scattering mirror (6) is fixed in the lower part. The laser diode (4) is used to emit laser light to aerosol particles (9) in the air sample. The scattering mirror (6) is used to reflect the scattered light emitted by the aerosol particles (9) under the action of the laser to the detector diode (5). The detector diode (5) is used to receive the scattered light and convert it into an electrical pulse. The number of aerosol particles in a certain particle size range in the air sample entering the monitoring cavity (2) within a certain time period is calculated, and the number concentration of aerosol particles in the air sample is obtained. A monitoring box (7) is fixed on the deck (1) of the hull at the upwind position of the hull oil and gas emission channel, and the aerosol multi-channel quantity concentration monitoring unit is set inside the monitoring box (7); Temperature probe and relative humidity probe are also installed on the outside of the monitoring box (7). The temperature probe is used to monitor the temperature of the outside atmosphere, and the relative humidity probe is used to monitor the relative humidity of the outside atmosphere. The signal output terminal of the detector diode (5), the temperature probe and the relative humidity probe are all connected to the aerosol data quality control module. The aerosol data quality control module is used to correct the number of aerosol particles in a certain particle size range in the air sample entering the monitoring cavity (2) within a certain period of time based on the received data of the number of aerosol particles in a certain particle size range in the air sample entering the monitoring cavity (2) within a certain period of time, the temperature data of the outside atmosphere and the relative humidity data, and to evaluate the growth rate of aerosol particles based on the hygroscopicity of aerosols.

2. The shipborne marine aerosol monitoring platform device according to claim 1, characterized in that: The detector diode (5) is used to monitor the intensity of the received scattered light signal and convert it into an electrical pulse. The particle size of the aerosol particles is proportional to the intensity of the scattered light signal, and the height of the electrical pulse is proportional to the particle size of the aerosol particles. The detector diode (5) is used to monitor the number of aerosol particles in the corresponding particle size segment of 45 particle size segments in the range of 0.25-10μm within a certain time period.

3. The shipborne marine aerosol monitoring platform device according to claim 1, characterized in that: The detector diode (5) is located directly above the scattering mirror (6), the air intake pipe (3) is vertical and located directly above the detector diode (5), and the scattering mirror (6) is arc-shaped with a central angle of 60°.

4. The shipborne marine aerosol monitoring platform device according to claim 1, characterized in that: The air inlet end of the air inlet pipe (3) is located outside the monitoring box (7), and a dryer is also provided on the air inlet pipe (3).

5. The shipborne marine aerosol monitoring platform device according to claim 4, characterized in that: The exhaust port is located at the bottom of the monitoring cavity (2), and an exhaust pipe (8) is connected to the exhaust port. A flow meter is provided on the exhaust pipe (8), and the exhaust end of the exhaust pipe (8) is outside the monitoring box (7). An aerosol multi-channel mass concentration monitoring unit is also provided inside the monitoring box (7). The aerosol multi-channel mass concentration monitoring unit includes a data storage module and a data processing module. The signal output terminal of the detector diode (5) and the flow meter are both connected to the data storage module. The data storage module is connected to the data processing module. The detector diode (5) is used to send the data of the number of aerosol particles in a certain particle size range in the air sample entering the monitoring cavity (2) within a certain time period to the data storage module. The flow meter is used to send the flow rate data of the air sample in the exhaust pipe (8) to the data storage module. The data processing module is used to calculate the mass concentration of aerosol particles in a certain particle size range in the air sample within a certain time period based on the data stored in the data storage module.

6. The shipborne marine aerosol monitoring platform device according to claim 4, characterized in that: The bottom plate of the monitoring box (7) is provided with heat dissipation and exhaust holes, so that the monitoring box (7) is in communication with the outside atmosphere.

7. The shipborne marine aerosol monitoring platform device according to claim 1, characterized in that: An automatic meteorological monitoring module is also installed on the outside of the monitoring box (7) to monitor the relative wind direction and relative wind speed above 10 meters on the ship deck (1) in real time. The signal output terminal of the automatic meteorological monitoring module is connected to the aerosol data quality control module. The aerosol data quality control module is used to exclude the number of aerosol particles in a certain particle size range in the air sample entering the monitoring chamber (2) during the time period when the angle difference between the relative wind direction and the ship direction is within the range of 110-260°, based on the received relative wind direction and relative wind speed data above 10 meters on the ship deck (1). It also excludes the number of aerosol particles in a certain particle size range in the air sample entering the monitoring chamber (2) during the time period when the relative wind speed is less than 2 m / s.

8. The shipborne marine aerosol monitoring platform device according to claim 7, characterized in that: The aerosol data quality control module is used to analyze the number of aerosol particles in a certain particle size range in the air sample that enters the monitoring chamber (2) within a certain time period. It excludes the aerosol particle number concentration data corresponding to the time period in which the number of aerosol particles in a certain particle size range in the air sample that enters the monitoring chamber (2) in a short period of time increases or decreases sharply without land transport effect and changes in meteorological conditions.

9. A method of using a shipborne marine aerosol monitoring platform device according to any one of claims 1-8, characterized in that, Specifically, the air intake pump is started to draw ambient air (10) above the sea area where the ship is located into the monitoring cavity (2) through the air intake pipe (3) to form an air sample. The laser diode (4) emits laser light to the aerosol particles (9) in the vertically downward flowing air sample entering the monitoring cavity (2). The aerosol particles (9) emit scattered light under the action of the laser and irradiate the scattering mirror (6). The scattering mirror (6) reflects the scattered light to the detector diode (5). The detector diode (5) converts the received scattered light into an electrical pulse and calculates the number of aerosol particles in a certain particle size range in the air sample entering the monitoring cavity (2) within a certain time period, and obtains the number concentration of aerosol particles in the air sample.

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