CN111795952A - Visibility detection system, method and computer readable storage medium - Google Patents
Visibility detection system, method and computer readable storage medium Download PDFInfo
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- CN111795952A CN111795952A CN202010699391.6A CN202010699391A CN111795952A CN 111795952 A CN111795952 A CN 111795952A CN 202010699391 A CN202010699391 A CN 202010699391A CN 111795952 A CN111795952 A CN 111795952A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
- G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
- G01N21/538—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke for determining atmospheric attenuation and visibility
Abstract
The invention provides a visibility detection system, a visibility detection method and a computer readable storage medium, wherein the visibility detection system comprises: the system comprises a plurality of visibility detection stations, a plurality of communication stations and a plurality of communication terminals, wherein the visibility detection stations are used for detecting atmospheric visibility information of positions where the visibility detection stations are located; the data acquisition and analysis base station is connected with the visibility detection station in a wired or wireless mode; and the data acquisition and analysis base station receives the atmospheric visibility information measured by the visibility detection stations in real time and fits the visibility information of each station. The visibility detection system provided by the invention detects the real-time visibility of each station through the visibility detection equipment, judges the occurrence range and the moving direction of the foggy mass, calculates the visibility danger level and the moving direction of the foggy mass according to the calculated data, sends the visibility danger level and the moving direction of the foggy mass to a highway monitoring center and warns a driver in an early warning way.
Description
Technical Field
The present invention relates to the field of optical measurement and intelligent transportation, and more particularly, to a visibility detection system, method, and computer-readable storage medium.
Background
The change of weather conditions, especially extreme severe weather conditions, brings great risks to the running of vehicles on roads, not only seriously affects transportation, but also causes serious loss of national property and people's lives and properties. Therefore, the monitoring of the road weather condition is an important basis for the scientific operation of roads, the visibility is an important meteorological observation element, wherein the small-range dense fog is called as cluster fog due to the influence of the microclimate environment of local areas, the cluster fog is also an important factor influencing the visibility, and the probability of traffic accidents is increased due to the fact that drivers cannot respond to the cluster fog in time and the drivers are suddenly braked due to sudden obstruction of sight lines due to the characteristics of strong burstiness, obvious locality, small size, large concentration and the like.
The road management department utilizes the visibility detector to monitor the visibility information in real time, and when severe weather occurs, means such as an information board and the like can be utilized to regulate and control the speed, traffic flow and the like in time, and a decision for closing the road can be made when necessary, so that the accident occurrence rate under the condition of low visibility can be greatly reduced. The traditional visibility measuring equipment has the defects of complex instrument manufacturing, high price, high installation difficulty, inconvenient maintenance and the like, and the defects seriously restrict the play of visibility early warning and disposal work in the aspect of highway fog treatment.
Visibility generally refers to the maximum disappearing distance of the contour of an object with a visual angle larger than 0.5 DEG when an observer with normal vision observes the object, and the disappearing distance of the object with certain luminous intensity when the observer with normal vision observes the object, and the visibility depends on the physiological characteristics of human eyes, the optical characteristics of the object and the background and the optical characteristics of an atmospheric air column in a sight line. Specific definition of MOR: at a color temperature of 2700K, the path length of the parallel beam flux emitted from the incandescent lamp is reduced to 0.05 of the initial value in the atmosphere. In short, the atmospheric transparency, i.e., the atmospheric path length at which the transmittance T is 0.05. According to the definition of meteorological optical visual range, that is to say when other factors are determined, the value of visibility can be indirectly deduced by measuring the atmospheric transmittance or the attenuation coefficient, which is also the theoretical basis for measuring the visibility by using instruments.
Commonly used visibility measuring devices include transmission-type visibility measuring instruments and forward scattering-type visibility measuring instruments, and both have the following characteristics:
the transmission-type visibility measuring instrument does not make a uniform assumption on the atmosphere, directly measures the transmittance and extinction coefficient of the atmosphere, has higher measurement precision on the visibility, but has complex installation because the detection range and precision depend on the length of a base line, and has larger measurement error when the visibility is higher due to the limitation of transmittance error and larger error caused by lens pollution.
The front scattering visibility measuring instrument has the advantages of compact structure, small volume, convenience in installation and maintenance, wide measuring range, small error caused by pollution of an optical lens to measurement, small sampling volume, uniform assumption to atmosphere, corresponding error caused by introduction of the proportional relation between the light radiation intensity and the scattering coefficient, and lower measuring accuracy compared with transmission type.
At present, visibility measuring instruments on the market have the defects of complex equipment installation, high maintenance difficulty and the like, so that actually measured data are mostly discrete data, representativeness is not realized, and visibility fog early warning on a highway cannot be well provided.
Disclosure of Invention
The invention aims to provide a visibility detection system which can realize visibility detection with low power consumption, convenient installation, simple operation and accurate measurement and can early warn the trend of group fog.
In order to solve the above technical problem, the present invention provides a visibility detection system, including: the system comprises a plurality of visibility detection stations, a plurality of communication stations and a plurality of communication terminals, wherein the visibility detection stations are used for detecting atmospheric visibility information of positions where the visibility detection stations are located; the data acquisition and analysis base station is connected with the visibility detection station in a wired or wireless mode; and the data acquisition and analysis base station receives the atmospheric visibility information measured by the visibility detection stations in real time and fits the visibility information of each station.
The visibility detection system has the advantages that: the real-time visibility of each station is detected through visibility detection equipment, the visibility information of the station is analyzed, the change trend of the visibility information of adjacent stations and the change of the station are analyzed, the visibility data measured by all the stations are collected through a data collection and analysis base station, the visibility change curve of the whole monitoring road is obtained, the appearance range and the moving direction of the foggy mass are judged according to the curve change tracks of each minute and each ten minutes in the past, for example, according to the individual visibility change of each station, the visibility change correlation of the adjacent stations and the station positions, the visibility danger level and the moving direction of the foggy mass are calculated according to the calculated data, and the visibility danger level and the moving direction of the foggy mass are sent to an expressway monitoring center and early-warned to.
Preferably, the visibility detection station comprises a wireless micro back-scattering visibility detector, and the wireless micro back-scattering visibility detector comprises: the device comprises a transmitter device, an optical receiver device, a lithium battery module, a lithium battery charging and discharging protection module, a visibility measured value calculation processing unit and a wireless communication module.
Preferably, the transmitter device enables the infrared light emitting diode to generate pulse waves at the frequency of 2-3 kHz, irradiates the pulse waves into the air at the 90-degree direction, is internally provided with a back scattering optical signal receiving module, measures a pollution value of a lens and is used for assisting in measuring and calculating visibility information; the optical receiver device receives scattered light of 30 degrees backward from a relatively emitted light ray of suspended matters in the air through the PIN photodiode, and the scattered light is processed and calculated to obtain a real-time visibility value according to a visibility measured value calculation processing unit of a backward scattered light signal through the preamplifier, the filter circuit and the AD conversion circuit.
Preferably, the lithium battery charging and discharging protection module performs charging and discharging management on the lithium battery module and tracks the maximum power point of the solar power supply panel; the lithium battery module stores electric energy and provides a working power supply for the visibility detection station under the condition of insufficient light; the visibility detection site and/or the data acquisition and analysis base station further comprises: the solar power supply board is used for providing a working power supply for the visibility detection station under the condition of sufficient sunlight.
Preferably, the visibility measured value calculation processing unit measures actual visibility information through an optical signal return value received by the optical receiver device, and corrects the obtained visibility information through a lens pollution value measured by the transmitter device.
Preferably, the connecting and fixing support comprises a solar power supply board fixing seat, a wireless micro back scattering visibility detection detector fixing seat and an installation fixing seat; the wireless communication module uploads the real-time visibility information acquired by the equipment to the data acquisition and analysis base station through wireless transmission.
The invention also provides a visibility detection method, which comprises the following steps: installing a set of visibility detection stations at intervals of a set distance on a monitored road section, and storing position information of the stations; the visibility detection station measures visibility information of the position where the visibility detection station is located, sends a measurement value to the data acquisition and analysis base station, and outputs the visibility change trend of the station in the past set time; the data acquisition and analysis base station calculates the trend of the foggy group by acquiring visibility information of all road sections and fitting the visibility information monitored by all road sections into the visibility information of the whole road section.
The road weather detection method has the beneficial effects that: the real-time visibility of each station is detected through visibility detection equipment, the visibility information of the station is analyzed, the change trend of the visibility information of adjacent stations and the change of the station are analyzed, the visibility data measured by all the stations are collected through a data collection and analysis base station, the visibility change curve of the whole monitoring road is obtained, the appearance range and the moving direction of the foggy mass are judged according to the curve change tracks of each minute and each ten minutes in the past, for example, according to the individual visibility change of each station, the visibility change correlation of the adjacent stations and the station positions, the visibility danger level and the moving direction of the foggy mass are calculated according to the calculated data, and the visibility danger level and the moving direction of the foggy mass are sent to an expressway monitoring center and early-warned to.
Preferably, a set of wireless micro back scattering visibility detection equipment is installed at every hundred meters of the monitored road section, and the actual longitude and latitude and altitude information of the station is stored in the data processing unit; measuring visibility information of the installation site through a wireless micro back scattering visibility detector, actively uploading the measured visibility information every five minutes when the visibility reaches a full range so as to reduce the power consumption of equipment, judging that fog occurs when the visibility is reduced, increasing the data transmission frequency at the moment, transmitting a measurement value to a data acquisition and analysis base station for 4 times per minute, outputting the visibility change trend of the site in the past one minute and ten minutes, and providing a basis for calculating the trend of the fog; the data acquisition and analysis base station acquires visibility information measured by a wireless micro back scattering visibility detector of the whole road section, and fits the visibility information of each station monitored by the whole road section into a visibility curve of the whole road section; the data acquisition and analysis base station compares the visibility change trends of the road section every minute and every ten minutes in the past of the visibility of the whole road section, judges and analyzes the visibility change trend and the mutual relation between each adjacent station, and judges the size and the moving direction of the area where the fog appears in the road section by combining the position information and comparing the change of the curve of the whole road section; and uploading the visibility information obtained by actual measurement, the calculated trend forecast of the foggy group and the information of the size of the foggy group to form early warning information.
Preferably, a wireless micro back-scattering visibility detector is installed continuously and the frequency of transmission of measurement data is automatically increased when the device detects a decrease in visibility.
The invention also provides a computer-readable storage medium, on which a computer program is stored which, when executed by a processor, implements the aforementioned method.
The computer readable storage medium has the advantages that: the real-time visibility of each station is detected through visibility detection equipment, the visibility information of the station is analyzed, the change trend of the visibility information of adjacent stations and the change of the station are analyzed, the visibility data measured by all the stations are collected through a data collection and analysis base station, the visibility change curve of the whole monitoring road is obtained, the appearance range and the moving direction of the foggy mass are judged according to the curve change tracks of each minute and each ten minutes in the past, for example, according to the individual visibility change of each station, the visibility change correlation of the adjacent stations and the station positions, the visibility danger level and the moving direction of the foggy mass are calculated according to the calculated data, and the visibility danger level and the moving direction of the foggy mass are sent to an expressway monitoring center and early-warned to.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic overall structure diagram of a visibility detection system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a connecting bracket of the visibility detecting system according to an embodiment of the present invention.
Fig. 3 is a layout diagram of field devices of the visibility detection system according to the first embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a miniature visibility detection detector of the visibility detection system according to an embodiment of the present invention.
Fig. 5 is a flowchart of a visibility detection method according to a second embodiment of the present invention.
Fig. 6 is a schematic diagram of a group fog trend early warning method according to an embodiment of the present invention.
Fig. 7 is a graph of visibility information of a station monitored by two different stations of the same road segment in the past 10 minutes according to the embodiment of the present invention.
Fig. 8 illustrates a visibility variation curve of a whole road segment according to an embodiment of the present invention.
FIG. 9 is a graph illustrating the visibility change over the past 10 minutes over a full segment according to an embodiment of the present invention.
Description of reference numerals:
1. a solar power supply board, 2, a connecting and fixing support, 3, a wireless micro back scattering visibility detection detector, 4, a data acquisition and analysis base station, 5, a visibility detection station, 201, a solar power supply board fixing seat, 202, a wireless micro back scattering visibility detection detector fixing seat, 203, an installation fixing seat, 301, a transmitter device, 302, a light receiver device, 303, a lithium battery charging and discharging protection module, 304, a visibility measurement value calculation processing unit, 305, a wireless communication module, 306 and a lithium battery module,
Detailed Description
The first embodiment,
As shown in fig. 1, the visibility detection system of the present invention includes: the visibility detection stations 5 are used for detecting atmospheric visibility information of positions where the visibility detection stations 5 are located; the data acquisition and analysis base station 4 is connected with the visibility detection station 5 in a wired or wireless mode; and the data acquisition and analysis base station 4 receives the atmospheric visibility information measured by the visibility detection station 5 in real time and fits the visibility information of each station.
The visibility detection system of the invention acquires visibility data measured by all stations through a data acquisition and analysis base station 4 by detecting the real-time visibility of each station and analyzing the size of the visibility information of the station and analyzing the change trend of the visibility information of adjacent stations and the change of the station to obtain the visibility change curve of the whole monitoring road, judges the occurrence range and the moving direction of the fog according to the curve change tracks of each station per minute and each ten minutes in the past, for example, in combination with the individual visibility change of each station, the visibility change correlation of adjacent stations and the station position, calculates the visibility danger level and the moving direction of the fog according to the calculated data, and sends the visibility danger level and the moving direction of the fog to a highway monitoring center and gives an early warning to inform a driver.
As shown in fig. 4, the visibility detection station 5 comprises a wireless micro-backscatter visibility detector, comprising: the system comprises a transmitter device 301, an optical receiver device 302, a lithium battery module 306, a lithium battery charging and discharging protection module 303, a visibility measured value calculation processing unit 304 and a wireless communication module 305.
The transmitter device 301 enables the infrared light emitting diode to generate pulse waves at the frequency of 2-3 kHz, irradiates the pulse waves into the air at the direction of 90 degrees, and is internally provided with a back scattering optical signal receiving module to measure a lens pollution value for assisting in measuring and calculating visibility information; the light receiver device 302 can receive scattered light of 30 degrees backward from the emitted light of suspended matter in the air through a PIN photodiode, and the scattered light is processed by a preamplifier, a filter circuit and an AD conversion circuit according to a visibility measurement value calculation processing unit 304 of the signal of the backward scattered light, so as to calculate a real-time visibility value. The transducer arrangement 301 has an automatic lens contamination calibration function.
The lithium battery charging and discharging protection module 303 performs charging and discharging management on the lithium battery module 306, so that damage to the lithium battery module 306 caused by overcharge or overdischarge is avoided; meanwhile, the maximum power point of the solar power supply panel 1 is tracked, and the output power of the solar power supply panel 1 is improved to the maximum extent; the lithium battery module 306 stores electric energy and provides a working power supply for the visibility detection station 5 under the condition of insufficient light; the visibility detection station 5 further comprises: the solar power supply board 1 is used for providing a working power supply for the visibility detection station 5 and charging the lithium battery module 306 under the condition of sufficient sunlight illumination.
The visibility measurement value calculation processing unit 304 measures actual visibility information from an optical signal return value received by the optical receiver device 302, and corrects the obtained visibility information according to a lens pollution condition measured by the transmitter device 301.
As shown in fig. 2, each visibility detection station 5 of the present invention further includes a connecting and fixing support 2, where the connecting and fixing support 2 includes a solar power supply board fixing base 201, a wireless micro back scattering visibility detection detector fixing base 202, and a mounting fixing base 203; the wireless communication module 305 uploads the real-time visibility information collected by the visibility detection station 5 to the data collection and analysis base station 4 through Lora, Zigbee or NB-loT wireless transmission.
As shown in fig. 3, each monitoring station composed of a solar power supply board, a connecting and fixing bracket, and a miniature visibility detector is used to measure visibility information of the location, and meanwhile, a set of monitoring stations is installed every hundred meters on the monitored road section, so that the collected data form a linear relationship. In this embodiment, the data acquisition and analysis base station 4 uses an STM32 series single chip microcomputer of a 32-bit ARM core as a main control unit, but not limited to the single chip microcomputer, to acquire data of each station through wireless transmission, fits visibility information monitored in a whole road section into a curve, calculates and compares changes of the curve to determine the size and the moving direction of an area where fog occurs in the road section, and outputs the type of the fog and a suggested processing method to a highway management part through wireless or optical fiber.
The specific type judgment method and the suggested treatment method of the cluster mist are as follows:
1. light fog: visibility is 1km-10km, light fog is output, and a code 01 does not need to be processed;
2. atomizing: visibility is 500m-1km, fog is output, and a code 02 for prompting foggy days and cautious driving is suggested through an information board;
3. fog: visibility is 200m-500m, large fog is output, the foggy day is suggested to be prompted through an information board, prudent driving is carried out, and 60 codes 03 of suggested vehicle speed are displayed;
4. dense fog: the visibility is 50m-200m, dense fog is output, and the dense fog weather, the speed limit is 60 and the vehicle distance keeping code 04 are suggested to be displayed through an early warning system such as information analysis and the like;
5. strong dense fog: the visibility is less than 50m, strong fog is output, and early warning systems such as information analysis and the like are suggested to display strong fog weather, limit speed to 20 and ensure that the vehicle can drive away from the high-speed code 05 as soon as possible.
In particular, the method comprises the following steps of,
example II,
As shown in fig. 5, the embodiment further provides an early warning method for the fog trend of the highway, which includes the following steps:
s101, installing a set of miniature visibility detection detectors 3 every one hundred meters on a monitored road section, and storing the actual longitude and latitude and altitude information of the station into a data processing unit 304.
The wireless micro back scattering visibility detection detectors 3 are continuously installed in a large area, so that the measured data can be ensured to have continuity and accuracy, the trend of the highway fog can be more scientifically and accurately calculated, and each wireless micro back scattering visibility detection detector stores the longitude and latitude and the altitude high speed of a station and provides scientific basis for the algorithm and prejudgment of the moving direction of the fog.
S102, measuring visibility information of the installation site through the wireless micro back scattering visibility detector 3, actively uploading the measured visibility information every other one minute when the visibility reaches a full range to reduce the power consumption of equipment, judging that fog is generated when the visibility is reduced, increasing the data transmission frequency at the moment, outputting the visibility change trends of the site in the past one minute and ten minutes, and providing a basis for calculating the trend of the fog.
Preferably, the visibility information is calculated by the boolean-Lambert (Bougner-Lambert) law, which is expressed as follows:
F＝F0exp(-σy) (1)
where F is a luminous flux received by light passing through the path length y in the atmosphere, F0 is a luminous flux when y is 0, and σ is an extinction coefficient.
The transmission factor is:
T＝F/F0＝exp(-σy) (2)
if this law is applied to the MOR-defined T ═ 0.05, the following relationship can be written:
T＝0.05＝exp(-σy) (3)
thus, the path length y of the atmosphere (i.e., the meteorological optical apparent distance MOR) is mathematically related to the extinction coefficient σ by:
y＝(1/R)*ln(1/0.05)≈3/σ (4)
the extinction coefficient is the attenuation of light due to scattering and absorption by atmospheric aerosols and molecules, and is equal to the sum of the absorption coefficient and the scattering coefficient, i.e., σ ═ b + c, b is the scattering coefficient, and c is the absorption coefficient. Atmospheric absorption of light is generally small compared to scattering, so the atmospheric extinction coefficient can be estimated by measuring the scattering coefficient of light from a finite volume of air. When the optical path is limited and the absorption of light by the atmosphere can be ignored, the measured scattering coefficient can be considered to have a linear relationship with the extinction coefficient within a certain range. The scattering coefficient and the extinction coefficient are in a linear relation, and the magnitude of scattering intensity is determined by the scattering coefficient. The scattering visibility meter estimates the atmospheric extinction coefficient by measuring the scattering intensity, and further determines the visible distance of the atmosphere.
The measured scattering coefficient can be considered to be linear with the extinction coefficient, i.e.:
σ≈K1*b (5)
the magnitude of the scattering intensity is in turn determined by the scattering coefficient. The power of the light source is stable, and the light signal S measured by the detector can be considered to represent the scattering intensity, namely:
S＝K2*b (6)
then the MOR is found to be:
VI≈(3*K2)/(K1*S) (7)
the visibility meter can determine the visibility distance VI of the atmosphere by measuring the backscattered light signal S.
S103, the data acquisition and analysis base station 4 acquires visibility information measured by the wireless micro back scattering visibility detector 3 of the whole road section and fits the visibility information monitored by the whole road section into a curve
And S104, comparing the visibility change trends of the road section every minute and every ten minutes in the past of the visibility of the whole road section, judging and analyzing the visibility change trend and the mutual relation between adjacent stations, and judging the size and the moving direction of the area with the fog in the road section by combining the position information and comparing the change of the curve of the whole road section through the data acquisition and analysis base station 4.
And S105, sending the visibility information obtained through actual measurement, the calculated trend forecast of the foggy group and the information of the size of the foggy group to a highway management department, and making effective traffic early warning for the highway management department aiming at severe weather.
And S106, finishing the measurement.
As shown in fig. 6-9, the visibility detection method of the present invention obtains visibility change curves of the whole monitored road by detecting the real-time visibility of each station and analyzing the visibility information of the station, and analyzing the change trend of the visibility information of adjacent stations and the change of the station, and collects visibility data measured by all stations through the data collection and analysis base station 4, and determines the occurrence range and the moving direction of the fog according to the curve change tracks of each past, such as every minute and every ten minutes, and combines the visibility change of each station alone, the visibility change correlation of adjacent stations and the station positions, and calculates the visibility danger level and the moving direction of the fog according to the calculated data, and sends the visibility danger level and the moving direction of the fog to the highway monitoring center and gives an early warning to inform the driver.
Example III,
In an embodiment of the present invention, a storage medium containing computer-executable instructions for performing the method of the foregoing embodiment when executed by a computer processor is provided.
The computer readable storage medium of the invention acquires visibility data measured by all stations through a data acquisition and analysis base station 4 by detecting the real-time visibility of each station and analyzing the size of the visibility information of the station and analyzing the change trend of the visibility information of adjacent stations and the change of the station to obtain the visibility change curve of the whole monitored road, judges the occurrence range and the moving direction of the foggy mass according to the curve change tracks of each station per minute and each ten minutes in the past, combines the visibility change of each station alone, the visibility change correlation of the adjacent stations and the station position, calculates the visibility danger level and the moving direction of the foggy mass according to the calculated data, and sends the visibility danger level and the moving direction of the foggy mass to a highway monitoring center and gives an early warning to inform a driver.
Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, 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 the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
The invention is not limited to the embodiments discussed above. The foregoing description of the specific embodiments is intended to describe and explain the principles of the invention. Obvious modifications or alterations based on the teachings of the present invention should also be considered as falling within the scope of the present invention. The foregoing detailed description is provided to disclose the best mode of practicing the invention, and also to enable a person skilled in the art to utilize the invention in various embodiments and with various alternatives for carrying out the invention.
Claims (10)
1. A visibility detection system characterized by: the method comprises the following steps:
the system comprises a plurality of visibility detection stations, a plurality of communication stations and a plurality of communication terminals, wherein the visibility detection stations are used for detecting atmospheric visibility information of positions where the visibility detection stations are located;
the data acquisition and analysis base station is connected with the visibility detection station in a wired or wireless mode;
and the data acquisition and analysis base station receives the atmospheric visibility information measured by the visibility detection stations in real time and fits the visibility information of each station.
2. The visibility detection system as defined in claim 1, wherein:
the visibility detection site comprises a wireless micro back scattering visibility detector, and the wireless micro back scattering visibility detector comprises:
the device comprises a transmitter device, an optical receiver device, a lithium battery module, a lithium battery charging and discharging protection module, a visibility measured value calculation processing unit and a wireless communication module.
3. The visibility detection system as defined in claim 2, wherein:
the transmitter device enables the infrared light-emitting diode to generate pulse waves at the frequency of 2-3 kHz, irradiates the pulse waves into the air at the 90-degree direction, is internally provided with a back scattered light signal receiving module, measures a pollution value of a lens and is used for assisting in measuring and calculating visibility information;
the optical receiver device receives scattered light of 30 degrees backward from a relatively emitted light ray of suspended matters in the air through the PIN photodiode, and the scattered light is processed and calculated to obtain a real-time visibility value according to a visibility measured value calculation processing unit of a backward scattered light signal through the preamplifier, the filter circuit and the AD conversion circuit.
4. The visibility detection system as defined in claim 2, wherein:
the lithium battery charging and discharging protection module carries out charging and discharging management on the lithium battery module and tracks the maximum power point of the solar power supply panel;
the lithium battery module stores electric energy and provides a working power supply for the visibility detection station under the condition of insufficient light;
the visibility detection site and/or the data acquisition and analysis base station further comprises: the solar power supply board is used for providing a working power supply for the visibility detection station under the condition of sufficient sunlight.
5. The visibility detection system as defined in claim 2, wherein:
the visibility measured value calculation processing unit measures actual visibility information through an optical signal return value received by the optical receiver device, and corrects the obtained visibility information through a lens pollution value measured by the transmitter device.
6. The visibility detection system as defined in claim 2, wherein: further comprising:
the device comprises a connecting and fixing support, a wireless micro back scattering visibility detection detector and a wireless micro back scattering visibility detection module, wherein the connecting and fixing support comprises a solar power supply board fixing seat, a wireless micro back scattering visibility detection detector fixing seat and a mounting fixing seat;
the wireless communication module uploads the real-time visibility information acquired by the equipment to the data acquisition and analysis base station through wireless transmission.
7. A visibility detection method, characterized by: the method comprises the following steps:
installing a set of visibility detection stations at intervals of a set distance on a monitored road section, and storing position information of the stations;
the visibility detection station measures the visibility information of the position where the visibility detection station is located;
the visibility detection station sends a measurement value to the data acquisition and analysis base station, and simultaneously outputs the visibility change trend of the station in the past set time;
the data acquisition and analysis base station calculates the trend of the foggy group by acquiring visibility information of all road sections and fitting the visibility information monitored by all road sections into the visibility information of the whole road section.
8. The visibility detection method according to claim 7, wherein:
installing a set of wireless micro back scattering visibility detection equipment at every hundred meters of a monitored road section, and storing the actual longitude and latitude and altitude information of the station to a data processing unit;
measuring visibility information of the installation site through a wireless micro back scattering visibility detector, actively uploading the measured visibility information every five minutes when the visibility reaches a full range so as to reduce the power consumption of equipment, judging that fog occurs when the visibility is reduced, increasing the data transmission frequency at the moment, transmitting a measurement value to a data acquisition and analysis base station for 4 times per minute, outputting the visibility change trend of the site in the past one minute and ten minutes, and providing a basis for calculating the trend of the fog;
the data acquisition and analysis base station acquires visibility information measured by a wireless micro back scattering visibility detector of the whole road section, and fits the visibility information of each station monitored by the whole road section into a visibility curve of the whole road section;
the data acquisition and analysis base station compares the visibility change trends of the road section every minute and every ten minutes in the past of the visibility of the whole road section, judges and analyzes the visibility change trend and the mutual relation between each adjacent station, and judges the size and the moving direction of the area where the fog appears in the road section by combining the position information and comparing the change of the curve of the whole road section;
and uploading the visibility information obtained by actual measurement, the calculated trend forecast of the foggy group and the information of the size of the foggy group to form early warning information.
9. The visibility detection method according to claim 8, wherein:
a wireless micro back-scattering visibility detector is continuously installed, and the transmission frequency of the measurement data is automatically increased when the device detects that the visibility is reduced.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 7-9.
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| CN113313914A (en) * | 2021-05-28 | 2021-08-27 | 谢静芳 | Group fog monitoring method, device and system and storage medium |
| CN113313914B (en) * | 2021-05-28 | 2022-08-02 | 谢静芳 | Group fog monitoring method, device and system and storage medium |
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