Areal precipitation microphysical measuring instrument with self-cleaning function and its control method

Abstract

The present invention relates to a planar array precipitation microphysical measurement instrument with a self-cleaning function and a control method thereof. The control method of the present invention includes: periodically acquiring images captured by a planar array camera; judging whether precipitation occurs in the measured environment of the planar array precipitation microphysical measurement instrument according to the images; if it is determined that precipitation occurs, controlling a cleaning component to perform self-cleaning on the light-emitting surface of the planar array light source and the lens of the planar array camera, and starting the planar array light source and the planar array camera to perform precipitation measurement. Only when precipitation occurs in the measured environment, the cleaning component will be controlled to perform self-cleaning on the light-emitting surface of the planar array light source and the lens of the planar array camera and carry out precipitation measurement work. It can greatly reduce the energy consumption of the planar array precipitation microphysical measurement instrument device during non-precipitation periods, and also perform self-cleaning on the light-emitting surface of the planar array light source and the lens of the planar array camera during precipitation measurement, making the data obtained from precipitation measurement more accurate and providing reliable precipitation microphysical data for meteorological research and related applications.

Description

Technical Field

[0001] The present invention relates to the technical field of particle measurement, and in particular to a planar array precipitation microphysical measuring instrument with a self-cleaning function and a control method thereof. Background Art

[0002] As a natural and extremely critical weather phenomenon, precipitation has an all-round and profound impact on the production and life of human society. Agricultural production is highly dependent on precipitation. Timely and appropriate precipitation is an important guarantee for the healthy growth of crops and the achievement of a good harvest. In the industrial field, precipitation conditions will affect the supply of water resources, which is in turn related to many industrial production links. In urban life, precipitation affects the smoothness of traffic, and heavy rains may cause urban waterlogging, causing serious interference to infrastructure and residents' lives. Because of the great significance of precipitation, in-depth research on it has always been a key topic in the field of meteorological science.

[0003] At present, the area array precipitation microphysical measurement technology plays a key role in the measurement of microphysical characteristic parameters of precipitation particles. The traditional area array precipitation microphysical measuring instrument is mainly based on optical detection. During use, the area array light source emits light to the camera. When there are no precipitation particles in the camera sampling space, the light intensity received by the camera does not change. When precipitation particles appear in the sampling space, the light beam of the light source is blocked and the light intensity at the corresponding position will be weakened. By further processing the collected images, the microphysical characteristics of precipitation particles can be analyzed.

[0004] However, the traditional area array precipitation microphysical measuring instrument has many defects in practical applications. On the one hand, the area array camera and the area array light source of the area array precipitation microphysical measuring instrument are exposed to the outdoor environment for a long time, and the light-emitting surface of the area array light source and the lens of the area array camera are easily contaminated with pollutants such as dust or aerosol particles; on the other hand, during precipitation, especially during heavy precipitation, precipitation may adhere to the light-emitting surface of the area array light source and the lens of the area array camera, making it impossible for the area array precipitation microphysical measuring instrument to accurately measure the precipitation in the measured area. Summary of the invention

[0005] An object of the present invention is to overcome at least one defect in the prior art and to provide a planar array precipitation microphysical measuring instrument with a self-cleaning function and a control method thereof.

[0006] A further object of the present invention is to use a fan to blow the light-emitting surface of the area array light source and the lens of the area array camera to clean possible contaminants.

[0007] Another further object of the present invention is to improve the accuracy of precipitation measurement by periodically cleaning the light emitting surface of the area array light source and the area array camera lens.

[0008] In particular, the present invention provides a control method for a planar array precipitation microphysical measurement instrument. The planar array precipitation microphysical measurement instrument includes: a planar array light source for providing a pulsed high-frequency light source to the area to be measured, a planar array camera for capturing images of the area to be measured, and a cleaning component for cleaning the light-emitting surface of the planar array light source and the lens of the planar array camera. The control method of the planar array precipitation microphysical measurement instrument includes: intermittently collecting the images captured by the planar array camera; determining whether precipitation occurs in the measured environment of the planar array precipitation microphysical measurement instrument based on the images; if it is determined that precipitation occurs, controlling the cleaning component to perform self-cleaning on the light-emitting surface of the planar array light source and the lens of the planar array camera, and starting the planar array light source and the planar array camera to perform precipitation measurement.

[0009] Optionally, the step of determining whether precipitation occurs in the measured environment of the planar array precipitation microphysical measurement instrument based on the images includes: obtaining the gray values of two consecutive images captured by the planar array camera; determining whether precipitation occurs in the measured environment of the planar array precipitation microphysical measurement instrument by comparing the gray values.

[0010] Optionally, the step of comparing the gray values includes: subtracting the gray values to obtain an image gray value difference, and generating a gray value difference matrix based on the image gray value difference; determining whether precipitation occurs in the measured environment based on the element values in the gray value difference matrix.

[0011] Optionally, the step of controlling the cleaning component to perform self-cleaning on the light-emitting surface of the planar array light source and the lens of the planar array camera, and starting the planar array light source and the planar array camera to perform precipitation measurement includes: cyclically executing the self-cleaning step and the precipitation measurement step according to a set period. Each set period includes a self-cleaning period for performing self-cleaning, a measurement period for performing precipitation measurement, and a particle free-settling period between the self-cleaning period and the measurement period.

[0012] Optionally, after the step of performing precipitation measurement, it further includes: adjusting the duration of the self-cleaning period according to the magnitude of the measured precipitation amount, such that the duration of the self-cleaning period increases correspondingly as the precipitation amount increases.

[0013] Optionally, the cleaning component includes: a first blower for blowing air flow towards the light-emitting surface of the planar array light source and a second blower for blowing air flow towards the lens of the planar array camera; the step of controlling the cleaning component to perform self-cleaning on the light-emitting surface of the planar array light source and the lens of the planar array camera includes: controlling the first blower and the second blower to operate to blow the light-emitting surface of the planar array light source and the lens of the planar array camera.

[0014] Optionally, the cleaning component further includes: a heating device for supplying hot air to the first blower, and a lens heating film for covering the surface of the area array camera lens; in the case where the precipitation amount is greater than or equal to a preset precipitation threshold, the step of controlling the cleaning component to perform self-cleaning on the light-emitting surface of the area array light source and the area array camera lens further includes: operating the heating device and the lens heating film, and controlling the first blower and the second blower to blow the light-emitting surface of the area array light source and the area array camera lens.

[0015] Specifically, the present invention provides an area array precipitation microphysical measuring instrument, including: a control device, the control device includes a memory, a processor, and a computer program stored on the memory, and the processor executes the computer program to implement the steps of the control method of the area array precipitation microphysical measuring instrument; an area array light source configured to provide a pulsed high-frequency light source to the area to be measured; an area array camera configured to capture an image of the area to be measured; a cleaning component configured to clean the light-emitting surface of the area array light source and the area array camera lens.

[0016] Optionally, the cleaning component includes: a first blower for blowing air flow to the light-emitting surface of the area array light source; a second blower for blowing air flow to the area array camera lens; a heating device for supplying hot air to the first blower; a lens heating film for covering the surface of the area array camera lens.

[0017] Optionally, the area array camera lens is a telecentric lens.

[0018] The control method of the area array precipitation microphysical measuring instrument provided by the present invention first intermittently acquires the images captured by the area array camera; then determines whether precipitation occurs in the measured environment of the area array precipitation microphysical measuring instrument according to the images; if it is determined that precipitation occurs, controls the cleaning component to perform self-cleaning on the light-emitting surface of the area array light source and the area array camera lens, and starts the area array light source and the area array camera to perform precipitation measurement. This method first determines whether precipitation occurs in the measured environment before performing precipitation measurement. In the case where precipitation occurs in the measured environment, the cleaning component performs self-cleaning on the light-emitting surface of the area array light source and the area array camera lens and performs precipitation measurement work. It can greatly reduce the energy consumption of the area array precipitation microphysical measuring instrument device during non-precipitation periods, and also perform self-cleaning on the light-emitting surface of the area array light source and the area array camera lens during precipitation measurement, which can make the data obtained from precipitation measurement more accurate and provide reliable precipitation microphysical data for meteorological research and related applications in a timely manner.

[0019] Furthermore, the control method of the area array precipitation microphysical measuring instrument of the present invention can more accurately improve the accuracy of whether precipitation occurs by obtaining the gray values of two consecutive images captured by the area array camera and judging whether precipitation occurs in the measured environment through the gray difference matrix generated by the image gray difference.

[0020] Furthermore, the control method of the planar array precipitation microphysical measurement instrument of the present invention also takes into account that self-cleaning of the light-emitting surface of the planar array light source and the lens of the planar array camera during the precipitation process may affect the natural physical state of precipitation particles in the measured environment. By cyclically executing a self-cleaning period for self-cleaning, a measurement period for precipitation measurement, and a particle free-settling period between the self-cleaning period and the measurement period. It can not only meet the self-cleaning requirements of the light-emitting surface of the planar array light source and the lens of the planar array camera; but also leave a free-settling period for the particles, reducing the impact of the self-cleaning process on precipitation particles and making the measurement results more accurate.

[0021] From the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more clear about the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but not restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0023] Figure 1 is a connection schematic diagram of a planar array precipitation microphysical measurement instrument applying an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of a planar array precipitation microphysical measurement instrument according to an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of a planar array light source according to an embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of a planar array camera according to an embodiment of the present invention;

[0027] Figure 5 is a flowchart of a control method of a planar array precipitation microphysical measurement instrument according to an embodiment of the present invention;

[0028] Figure 6 is a flowchart of steps for determining whether precipitation occurs in the measured environment of a planar array precipitation microphysical measurement instrument according to an embodiment of the present invention based on an image;

[0029] Figure 7 is a flowchart of cyclically executing a self-cleaning step and a precipitation measurement step according to a set period according to another embodiment of the present invention;

[0030] Figure 8 is a schematic diagram of a control device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Those skilled in the art should understand that the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments of the present invention. These embodiments are intended to explain the technical principles of the present invention, rather than to limit the protection scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts should still fall within the protection scope of the present invention.

[0032] It should be noted that the logic and / or steps represented in the flowchart or described in other ways herein can be considered as a definite sequence list of executable instructions for implementing logical functions, which can be specifically implemented in any computer-readable medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other systems that can fetch instructions from the instruction execution system, apparatus, or device and execute the instructions), or used in combination with these instruction execution systems, apparatuses, or devices.

[0033] This embodiment provides a planar array precipitation microphysical measuring instrument. Figure 1 FIG. 10 is a schematic connection diagram of a planar array precipitation microphysical measuring instrument according to an embodiment of the present invention. The planar array precipitation microphysical measuring instrument generally includes a control device 100, a planar array light source 200, a planar array camera 300, and a cleaning component. The control device 100 is used to control the planar array precipitation microphysical measuring instrument to perform self-cleaning and precipitation measurement, and is used for time synchronization, exposure control of the planar array light source 200 and the planar array camera 300, and switch control of the planar array light source 200 or the planar array camera 300.

[0034] The planar array light source 200 is used to provide a pulsed high-frequency light source to the measured environment 400 and the planar array camera 300. The planar array camera 300 is used to capture images of the measured environment 400. In some embodiments, the planar array camera 300 can be a high-frame-rate planar array camera 300 to ensure the image capture quality. When there are a large number of pollutants such as dust or aerosol particles or a large amount of precipitation in the measured environment 400, the first fan 210 blows the pollutants or precipitation water droplets on the light-emitting surface of the planar array light source 200 clean, and the second fan 310 blows the pollutants or precipitation water droplets on the lens of the planar array camera 300 clean.

[0035] Considering that in the case of relatively large precipitation or relatively low temperature, it is not easy to clean the light-emitting surface of the area array light source 200 and the lens of the area array camera 300 only by relying on the first fan 210 and the second fan 310. The area array precipitation microphysical measuring instrument of this embodiment is also provided with a heating device 220 and a lens heating film 330. The heating device 220 is arranged on one side of the area array light source 200 and is used to provide hot air to the first fan 210; the lens heating film 330 covers the surface of the lens of the area array camera 300 and is used to heat the surface of the lens of the area array camera 300. The heating device 220 heats the air flow blown by the first fan 210. And the surface of the lens of the area array camera 300 is heated by using the lens heating film 330, and the water droplets or snow grains covering the light-emitting surface of the area array light source 200 and the lens of the area array camera 300 can melt more quickly, so as to realize the comprehensive cleaning of the light-emitting surface of the area array light source 200 and the lens of the area array camera 300, making the result of precipitation measurement more accurate. In addition, since the lens of the area array camera 300 is a precision device, the lens is prone to be damaged or scratched in the use environment. Covering the lens heating film 330 on the surface of the lens of the area array camera 300 can also play a certain protective role, avoiding lens damage or injury caused by the harsh external environment.

[0036] In some embodiments, considering that the edge of the lens heating film 330 may have a condensation phenomenon due to being in a hot and cold alternating environment under low temperature conditions, and the condensation may block the lens, resulting in inaccurate precipitation measurement results. In view of this phenomenon, a lens heating device 320 can also be arranged between the second fan 310 and the lens of the area array camera 300. The lens heating device 320 can heat the air near the lens of the area array camera 300. Through the blowing action of the second fan 310, a hot air flow can be formed on the surface of the lens of the area array camera 300, avoiding the possible condensation situation. Further improving the accuracy of precipitation measurement.

[0037] Figure 2 It is a schematic diagram of an area array precipitation microphysical measuring instrument according to an embodiment of the present invention. During the operation of the area array precipitation microphysical measuring instrument, the control device 100 controls the area array light source 200 to emit light, and the light shines on the measured environment 400, so that the area array camera 300 can capture an image in the measured environment 400. In order to avoid pollutants or precipitation particles from blocking the area array light source 200 or the area array camera 300, a first fan 210 and a second fan 310 can be respectively arranged at the light-emitting surface of the area array light source 200 and the lens of the area array camera 300. When the first fan 210 and the second fan 310 are running, they can blow the light-emitting surface of the area array light source 200 and the lens of the area array camera 300, avoiding the interference of pollutants or precipitation particles on the measurement work during precipitation measurement and improving the measurement accuracy.

[0038] Figure 3

[0038] is a schematic diagram of a planar array light source 200 according to an embodiment of the present invention. The first fan 210 can be arranged on one side of the planar array light source 200, and the planar array light source 200 is horizontally blown by the first fan 210 to achieve the purpose of cleaning the light emitting surface of the planar array light source 200. A heating device 220 can also be arranged between the planar array light source 200 and the first fan 210. The heating device 220 can heat the air near the planar array light source 200, and the hot air and the first fan 210 can cooperate to form a hot air flow blowing towards the planar array light source 200. Compared with the method of only using the first fan 210 to clean the planar array light source 200, using the first fan 210 and the heating device 220 in cooperation can more thoroughly clean the surface of the planar array light source 200 and improve the measurement accuracy of precipitation measurement.

[0039] Figure 4

[0038] is a schematic diagram of a planar array camera 300 according to an embodiment of the present invention. The second fan 310 can be arranged on one side of the planar array camera 300, and the planar array camera 300 is horizontally blown by the second fan 310 to achieve the purpose of cleaning the lens of the planar array camera 300. A lens heating film 330 can also be covered on the surface of the lens of the planar array camera 300. The lens heating film 330 can not only heat the precipitation particles dripping on the lens heating film 330 to achieve the cleaning purpose, but also protect the lens of the planar array camera 300 from being damaged or injured. In some embodiments, a lens heating device 320 can also be arranged between the planar array camera 300 and the second fan 310. The lens heating device 320 can heat the air near the planar array camera 300, and the hot air and the second fan 310 can cooperate to form a hot air flow blowing towards the planar array camera 300. The hot air flow can blow towards the lens to avoid condensation at the junction of the lens heating film 330 and the lens. Compared with the method of only using the second fan 310 to clean the planar array camera 300, using the second fan 310, the lens heating film 330 and the lens heating device 320 in cooperation can more thoroughly clean the lens of the planar array camera 300. In some embodiments, the lens heating device 320 can be arranged in a shape adapted to the shape of the lens of the planar array camera 300 and the shape of the lens heating film 330. For example, if the lens of the planar array camera 300 is circular and the lens heating film 330 is circular and adapted to the lens of the planar array camera 300, the lens heating device 320 can be arranged in a semi-circular shape adapted to the circular lens, so that the hot air generated when the lens heating device 320 operates can fully blow the lens of the planar array camera 300 and the surface of the lens heating film 330. The measurement accuracy in the precipitation measurement process is improved.

[0040] In some alternative embodiments, the cleaning assembly may include a first blower 210, a second blower 310, a heating device 220, and a lens heating device 320. By blowing air flow onto the light-emitting surface of the area array light source 200 through the first blower 210, contaminants or precipitation particles attached to the light-emitting surface of the area array light source 200 can be cleaned. By blowing air flow onto the lens of the area array camera 300 through the second blower 310, contaminants or precipitation particles attached to the lens of the area array camera 300 can be cleaned. Further, when the blowing actions of only the first blower 210 and the second blower 310 are insufficient to remove the contaminants or precipitation particles attached to the light-emitting surface of the area array light source 200 and the lens of the area array camera 300, a heating device 220 can be provided on one side of the light-emitting surface of the area array light source 200, and a lens heating film 330 can be covered on the surface of the lens of the area array camera 300 or a lens heating device can be further provided. The light-emitting surface of the area array light source 200 and the lens of the area array camera 300 can be cleaned more thoroughly, thereby improving the measurement accuracy of the area array precipitation microphysical measuring instrument during the precipitation measurement process.

[0041] In some other alternative embodiments, the lens of the area array camera 300 can use a telecentric lens. Using a telecentric lens can eliminate the perspective error of the camera and obtain images with stable quality, further improving the measurement accuracy of the precipitation measurement.

[0042] This embodiment also provides a control method for an area array precipitation microphysical measuring instrument, which controls the area array precipitation microphysical measuring instrument in the above embodiment to improve the measurement accuracy. Figure 5 It is a schematic flowchart of a control method for an area array precipitation microphysical measuring instrument according to an embodiment of the present invention. The control method for the area array precipitation microphysical measuring instrument at least includes the following steps S201 to step S203.

[0043] Step S201, collect the images taken by the area array camera at intervals.

[0044] Step S202, determine whether precipitation occurs in the measured environment of the area array precipitation microphysical measuring instrument according to the images.

[0045] Step S203, if it is determined that precipitation occurs, control the cleaning assembly to perform self-cleaning on the light-emitting surface of the area array light source and the lens of the area array camera, and start the area array light source and the area array camera to perform precipitation measurement.

[0046] The inventor realized that although an area array camera can record the particle morphology in the measured environmental space, affected by the environmental wind, many particles will cover the camera lens. On the one hand, particles such as snowflakes and raindrops will contaminate the camera lens under the action of the environmental wind, blocking the imaging of particles in the camera's field of view; on the other hand, when the area array light source is blocked by snow, the area array light beam received by the camera is uneven, which will cause particle recognition errors. Therefore, by setting the area array camera to take an image of the measured environment at regular intervals, and by comparing the images of two consecutive times, it is possible to know whether precipitation occurs in the measured environment. In the case of determining that precipitation occurs in the measured environment, the cleaning component is controlled to clean the light emitting surface of the area array light source and the lens of the area array camera, so that the area array light source can emit a pulsed high-frequency light source, and the area array camera can accurately collect the precipitation situation in the measured environment. Through the above method, the area array precipitation microphysical measuring instrument can accurately identify the occurrence time of precipitation, and control the cleaning component to clean the light emitting surface of the area array light source and the lens of the area array camera, ensuring the accuracy of precipitation measurement.

[0047] Furthermore, during the precipitation measurement process, the precipitation itself will also block the light emitting surface of the area array light source and the lens of the area array camera, resulting in inaccurate measurement results. The inventor further realized that the precipitation measurement and self-cleaning can be alternated, so that the light emitting surface of the area array light source and the lens of the area array camera can be kept clean for a relatively long time, reducing the adverse impact of the precipitation itself on the precipitation measurement.

[0048] In some alternative embodiments, when determining whether precipitation occurs in the measured environment of the area array precipitation microphysical measuring instrument based on the image, the gray values of two consecutive images can be compared to determine whether precipitation occurs in the measured environment of the area array precipitation microphysical measuring instrument. Figure 6 is a schematic flowchart of the steps of determining whether precipitation occurs in the measured environment of the area array precipitation microphysical measuring instrument according to an embodiment of the present invention; according to Figure 6 As described above, the steps of determining whether precipitation occurs in the measured environment at least include the following steps S301 to step S303.

[0049] Step S301: Obtain the grayscale values of two consecutive images captured by the area array camera. This is because grayscale values are one of the most basic features of an image, and they intuitively reflect the brightness information of the pixels in the image. In the images captured by the area array camera, the presence or absence of precipitation particles will significantly affect the propagation and reception of light. When precipitation particles enter the sampling space, they will block or scatter light, thereby changing the intensity of the light received by the camera. This change in light intensity will be directly reflected in the grayscale values of the image pixels. For example, after precipitation particles block the light, the pixels in the corresponding area receive less light, and the grayscale value will decrease. By comparing the changes in the grayscale values of consecutive images, the light changes caused by precipitation particles can be sensitively captured, and whether precipitation occurs can be judged based on the light changes. Moreover, compared with the complex multi-channel information such as red, green, and blue contained in color images, grayscale values are easier and more efficient to process. Image comparison and analysis only need to focus on the single grayscale channel data, reducing the data processing volume and complexity. The control device can quickly calculate the difference between two consecutive images. This is crucial for the area array precipitation microphysical measurement instrument that needs to judge the precipitation situation in real time and quickly. Completing a large number of image comparisons in a short time and promptly reflecting the changes in precipitation can save time for subsequent cleaning and measurement work.

[0050] Step S302: Subtract the grayscale values to obtain the image grayscale difference, and generate a grayscale difference matrix based on the image grayscale difference. Subtracting the grayscale values of two consecutive images to obtain the grayscale difference can more accurately understand the current environmental change state. In the process of analyzing the grayscale difference of the image, even the slightest change in light can be clearly expressed through the grayscale difference data. For example, if a very small amount of precipitation particles enter the measured environment, the weak light change caused by them is not easily observed by general observation methods. However, the change in grayscale value will be significantly reflected in the grayscale difference. This greatly improves the detection ability of the area array precipitation microphysical measurement instrument in the case of the initial stage of precipitation or fewer precipitation particles, avoiding the situation of missing key precipitation information.

[0051] Step S303: Determine whether precipitation occurs in the measured environment based on the element values in the grayscale difference matrix. The element values in the grayscale difference matrix can accurately reflect whether precipitation occurs in the measured environment. For example, when all the elements in the grayscale difference matrix are 0, it indicates that the grayscale values of two consecutive images captured by the area array camera are the same, that is, there is no change in the measured environment, and it can be concluded that there is no environmental change in the measured environment during the current period, further indicating that there is no precipitation in the current environment. When non-zero values appear in the grayscale difference matrix, it indicates that the grayscale values of two consecutive images captured by the area array camera are different, that is, the measured environment has changed, and precipitation may occur during this period. Another example is that a threshold of the grayscale difference matrix can be preset. When the value of the grayscale difference matrix of two consecutive images captured by the area array camera is greater than the preset threshold of the grayscale difference matrix, it is determined that precipitation occurs in the measured environment, otherwise it is determined that no precipitation occurs. By setting the grayscale difference threshold, some possible minor interferences in the natural environment can be excluded, avoiding misjudgment of whether precipitation occurs by the area array precipitation microphysical measuring instrument, improving the precipitation measurement accuracy and avoiding unnecessary energy waste.

[0052] In some other alternative embodiments, the self-cleaning can also be adjusted according to the value of the grayscale difference matrix. For example, when the value of the grayscale difference matrix is small, it can indirectly reflect that the precipitation amount in the current measured environment is small. At this time, only blowing by the fan can meet the cleaning requirements of the light-emitting surface of the area array light source and the lens of the area array camera. When the value of the grayscale difference matrix is large, it can indirectly reflect that the precipitation amount in the current measured environment is large. At this time, only blowing by the fan may not be able to meet the cleaning requirements of the light-emitting surface of the area array light source and the lens of the area array camera. It is also necessary to operate the heating device to heat the air near the light-emitting surface of the area array light source and the lens of the area array camera. By blowing the heated air by the fan to form a hot air flow, the cleaning of the light-emitting surface of the area array light source and the lens of the area array camera can be further strengthened, and thus the result of precipitation measurement can be made more accurate.

[0053] In some alternative embodiments, the inventor also realizes that the self-cleaning process may affect the free settlement of precipitation particles, resulting in inaccurate precipitation measurement results. A period of time can be set between the self-cleaning period and the precipitation measurement period for the precipitation particles to settle naturally. Figure 7 It is a schematic flowchart of cyclically executing the self-cleaning step and the precipitation measurement step according to a set period according to another embodiment of the present invention. Cyclically executing the self-cleaning step and the precipitation measurement step according to a set period may at least include the following steps S401 to S403.

[0054] Step S401: The self-cleaning period for self-cleaning.

[0055] Step S402: The particle free settlement period.

[0056] Step S403, the measurement period for precipitation measurement.

[0057] To reduce the impact of the self-cleaning process on the free settlement of precipitation particles, after the self-cleaning period is run, a time for the free settlement of precipitation particles can be left, and then the measurement period for precipitation measurement can be carried out. Before measuring the environment to be measured, the precipitation particles in the area of the environment to be measured have undergone sufficient natural settlement. In this way, both the light-emitting surface of the area array light source and the lens of the area array camera can be cleaned in a timely manner, and the precipitation particles during measurement can be ensured to be unaffected.

[0058] In some other alternative embodiments, the duration of the self-cleaning period can also be adjusted according to the measured precipitation amount, such that the duration of the self-cleaning period increases correspondingly as the precipitation amount increases. For example, when it is found after measurement that the current precipitation amount is large, it can be determined that the impact of the current precipitation on the measurement will correspondingly become larger, and the duration of the self-cleaning period can be increased to ensure that the light-emitting surface of the area array light source and the lens of the area array camera are sufficiently cleaned before measurement. In some alternative embodiments, the proportion of the self-cleaning period in the cycle can also be increased to ensure that the light-emitting surface of the area array light source and the lens of the area array camera are sufficiently cleaned before precipitation measurement. This design of adjusting the self-cleaning period according to the precipitation amount has very significant advantages. From the perspective of measurement accuracy, when the precipitation amount is large, more precipitation particles adhere to the light-emitting surface of the area array light source and the lens of the area array camera, causing greater interference to the light propagation. By extending the self-cleaning duration, these interfering substances can be more thoroughly removed, ensuring the normal operation of the optical system, improving the image clarity, and thus enhancing the accuracy of the area array precipitation microphysical measuring instrument. From the aspect of data reliability, ensuring thorough cleaning before measurement can avoid measurement errors caused by incomplete cleaning, provide more stable and reliable precipitation data for meteorological research, strongly support the construction and prediction analysis of meteorological models, and improve the quality and accuracy of meteorological measurements.

[0059] In some alternative embodiments, the cleaning component includes a first blower for blowing air towards the light-emitting surface of the area array light source and a second blower for blowing air towards the lens of the area array camera. The step of controlling the cleaning component to perform self-cleaning on the light-emitting surface of the area array light source and the lens of the area array camera includes controlling the first blower and the second blower to operate to blow the light-emitting surface of the area array light source and the lens of the area array camera. The inventor realized that although the area array camera can record the particle morphology in the space of the environment to be measured, affected by the environmental wind, many pollutant particles will cover the lens of the area array camera and the light-emitting surface of the area array light source. By respectively arranging the first blower and the second blower on the sides of the light-emitting surface of the area array light source and the lens of the area array camera, the first blower and the second blower can respectively blow the light-emitting surface of the area array light source and the lens of the area array camera, so that the pollutants or precipitation particles covering the light-emitting surface and the lens are blown clean, ensuring the accuracy of precipitation measurement.

[0060] In some other alternative embodiments, merely blowing by the first blower and the second blower may not be sufficient to clean the light-emitting surface of the area light source and the lens of the area camera. For example, in a low-temperature environment, precipitation particles such as snowflakes or raindrops may freeze on the light-emitting surface and the lens. At this time, merely blowing by the first blower and the second blower is not sufficient to clean the light-emitting surface and the lens. Therefore, the cleaning assembly may further include a heating device for supplying hot air to the first blower and a lens heating film for covering the surface of the lens of the area camera. In the case where the precipitation amount is greater than or equal to a preset precipitation threshold, the step of controlling the cleaning assembly to perform self-cleaning on the light-emitting surface of the area light source and the lens of the area camera further includes operating the heating device and the lens heating film, controlling the first blower to blow hot air toward the light-emitting surface of the area light source, and controlling the second blower to blow on the surface of the lens heating film. By blowing with the hot air flow, the pollutants on the light-emitting surface and the lens can be more thoroughly removed, ensuring clear imaging of the optical system and improving the measurement accuracy.

[0061] The flowcharts provided in this embodiment are not intended to indicate that the operations of the method will be performed in any specific order, or that all operations of the method are included in every case. In addition, the method may include additional operations. Within the scope of the technical concept provided by the method of this embodiment, additional changes may be made to the above method.

[0062] It should be understood that in some embodiments, each part may be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods may be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system.

[0063] This embodiment also provides a control device 100. Figure 8 It is a schematic diagram of a control device according to an embodiment of the present invention. The control device 100 includes a computer program 11, and when the computer program 11 is executed by a processor 32, the steps of any one of the above control methods of the area precipitation microphysical measuring instrument are implemented.

[0064] The computer program 11 for performing the operations of the present invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, configuration data of an integrated circuit, or source code or object code written in any combination of one or more programming languages and procedural programming languages. The computer program 11 may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the latter case, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider via the Internet). In some embodiments, to perform aspects of the present invention, an electronic circuit, including for example a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA), may execute computer-readable program instructions by utilizing the state information of the computer-readable program instructions to personalize the electronic circuit.

[0065] The control device 100 may be, for example, a server, a desktop computer, a laptop computer, a tablet computer, or a smart phone. In some examples, the control device 100 may be a cloud computing node. The control device 100 may be described in the general context of computer system-executable instructions, such as program modules, executed by a computer system. Generally, program modules may include routines, programs, object programs, components, logic, data structures, etc. that perform specific tasks or implement specific abstract data types. The control device 100 may be implemented in a distributed cloud computing environment where tasks are performed by remote processing devices linked through a communication network. In a distributed cloud computing environment, program modules may be located on local or remote computing system storage media including storage devices.

[0066] The control device 100 may include a processor 32 adapted to execute stored instructions and a memory 31 that provides temporary storage space for the operation of the instructions during operation. The processor 32 may be a single-core processor, a multi-core processor, a computing cluster, or any number of other configurations. The memory 31 may include random access memory (RAM), read-only memory, flash memory, or any other suitable storage system.

[0067] The control device 100 may further include a network adapter / interface and an input / output (I / O) interface. The I / O interface allows data to be input and output with external devices that can be connected to a computer device. The network adapter / interface may provide communication between the computer device and a network, which is typically shown as a communication network.

[0068] At this point, those skilled in the art should recognize that although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and determined to cover all such other variations or modifications.

Claims

1. A control method for a surface array precipitation microphysical measuring instrument, characterized in that: The area array precipitation microphysical measuring instrument comprises: an area array light source for providing a pulsed high-frequency light source to the area to be measured, an area array camera for taking an image of the area to be measured, and a cleaning component for cleaning the light-emitting surface of the area array light source and the lens of the area array camera, and the control method comprises: collecting images taken by the area array camera at intervals; Judging whether precipitation occurs in the measured environment of the area array precipitation microphysical measuring instrument according to the image; If it is determined that precipitation occurs, the cleaning component is controlled to self-clean the light-emitting surface of the area array light source and the lens of the area array camera, and the area array light source and the area array camera are started to measure precipitation; The steps of controlling the cleaning component to self-clean the light emitting surface of the area array light source and the area array camera lens, and starting the area array light source and the area array camera to perform precipitation measurement include: cyclically executing the self-cleaning step and the precipitation measurement step according to a set cycle, each of the set cycles comprising a self-cleaning period for performing the self-cleaning, a measurement period for performing the precipitation measurement, and a particle free settling period between the self-cleaning period and the measurement period; The steps for taking precipitation measurements also include: The duration of the self-cleaning period is adjusted according to the measured amount of precipitation, so that the duration of the self-cleaning period increases accordingly as the amount of precipitation increases.

2. The control method according to claim 1, characterized in that: The step of judging whether precipitation occurs in the measured environment of the area array precipitation microphysical measuring instrument according to the image comprises: Obtaining grayscale values ​​of two images taken continuously by the area array camera; By comparing the grayscale values, it is determined whether precipitation occurs in the measured environment of the area array precipitation microphysical measuring instrument.

3. The control method according to claim 2, characterized in that: The step of comparing the grayscale values ​​comprises: Subtracting the grayscale values ​​to obtain image grayscale differences, and generating a grayscale difference matrix according to the image grayscale differences; Whether precipitation occurs in the measured environment is determined according to the element values ​​in the grayscale difference matrix.

4. The control method according to claim 1, characterized in that: The cleaning component comprises: a first fan for blowing airflow toward the light-emitting surface of the area array light source and a second fan for blowing airflow toward the lens of the area array camera; The step of controlling the cleaning component to self-clean the light emitting surface of the area array light source and the area array camera lens comprises: The first fan and the second fan are controlled to blow the light-emitting surface of the area array light source and the lens of the area array camera.

5. The control method according to claim 4, characterized in that: The cleaning assembly further comprises: a heating device for providing hot air to the first blower and a lens heating film for covering the surface of the area array camera lens; When the precipitation is greater than or equal to a preset precipitation threshold, the step of controlling the cleaning component to self-clean the light-emitting surface of the area array light source and the area array camera lens further includes: The heating device and the lens heating film are operated, and the first fan and the second fan are controlled to blow the light-emitting surface of the area array light source and the area array camera lens.

6. A surface array precipitation microphysical measuring instrument, comprising: A control device, the control device comprising a memory, a processor and a computer program stored in the memory, characterized in that the processor executes the computer program to implement the steps of the control method of the area array precipitation microphysical measuring instrument according to any one of claims 1 to 5; An array light source configured to provide a pulsed high-frequency light source to the area to be measured; An area array camera is configured to capture an image of the area to be measured; A cleaning component is configured to clean the light emitting surface of the area array light source and the area array camera lens.

7. The area array precipitation microphysical measuring instrument according to claim 6, characterized in that: The cleaning component comprises: A first fan, used for blowing airflow toward the light-emitting surface of the planar array light source; A second fan, used for blowing airflow toward the area array camera lens; A heating device, used to provide hot air to the first fan; A lens heating film is used to cover the surface of the area array camera lens.

8. The area array precipitation microphysical measuring instrument according to claim 6, characterized in that: The area array camera lens is a telecentric lens.

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