CN108227044A - A kind of raindrop measuring device and method based on twin-line array - Google Patents
A kind of raindrop measuring device and method based on twin-line array Download PDFInfo
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- CN108227044A CN108227044A CN201810078233.1A CN201810078233A CN108227044A CN 108227044 A CN108227044 A CN 108227044A CN 201810078233 A CN201810078233 A CN 201810078233A CN 108227044 A CN108227044 A CN 108227044A
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Abstract
The invention discloses a kind of raindrop measuring device and method based on twin-line array, described device includes optical system, two-wire photodiode array, photoelectric signal collection processing circuit and data processing module；The optical system is for exporting a collimation, the uniform laser beam of light distribution, and direct irradiation is on two-wire photodiode array；And the raindrop for being captured to two-wire photodiode array are imaged；The two-wire photodiode array is that the completely the same photodiode array unit of two row specifications and characteristics being arranged in parallel is encapsulated on one piece of photo electric sensitive element；The photoelectric signal collection processing circuit is used to handle the sprocket pulse signal received, calculate the terminal-velocity of raindrop, and the sample rate of raindrop image is updated, to raindrop, imaging is acquired and handles on photodiode array, obtains the diameter and true picture of raindrop；The data processing module is used to calculate precipitation parameter according to the flatness of raindrop diameter, speed and image.
Description
Technical field
The present invention relates to particle measurement fields, and in particular to a kind of raindrop measuring device and method based on twin-line array.
Background technology
Raindrop are measured be physics of cloud and precipitation research a kind of important observation experiment means.By measuring raindrop
Raindrop spectrum information is obtained, various precipitation physical parameters (such as population density, rainwater content, raininess can be calculated using raindrop size distribution
And radar reflectivity factor) and raindrop to the attenuation of microwave, establish experience between radar reflectivity factor and precipitation intensity
Relationship etc..
The method of traditional measurement raindrop size distribution mainly have filter paper splash procedure, KINETIC METHOD, flour ball, high-speed photograph method and
Infusion method etc..These traditional methods are required for a large amount of artificial participation, can not complete the automatic measurement to raindrop size distribution, therefore survey
Amount efficiency is very low.
The main method of raindrop size distribution automatic measurement is that particle is measured using laser at present, be particularly may be divided into based on light
Learn the measuring technique of scattering and the measuring technique based on optical imagery.Measuring technique based on optical scattering can measure raindrop
Size, but the concrete shape information of precipitation particles can not be obtained, and the particle size range measured is limited.The measurement of optical imagery
Technology can not only measure the size of precipitation particles, additionally it is possible to record the image of precipitation particles, according to the image of precipitation particles just
The shape information of precipitation particles can be obtained.
The raindrop measuring technique of optical imagery mainly has precipitation particles image measuring device based on single line battle array and based on CCD
The precipitation particles image measuring device of camera.Particle imaging measuring device based on CCD camera can be to the size and shape of particle
Shape carries out accurate imaging, but particle rapidity can not be measured；In addition, CCD camera since its framing rate is limited, limits
Its application in high density high speed scene.Particle imaging measuring device based on single line battle array, can be to particle size, shape
It is measured with speed, but since the sample rate of its particle picture is prefabricated, can not be matched, led with the terminal-velocity of particle
Cause the particle picture measured by it that very big deviation can occur, this also highly impacts it and measures the accurate of particle physics parameter
Property.Also there is the measurement that precipitation particles terminal-velocity is carried out using two single line battle arrays at present, but utilize the particle terminal-velocity of two single line battle arrays
It measures, since two linear arrays are separation so that limitation of two linear arrays because of element in itself, distant, two lines of installation
The distance between battle array leads to particle terminal-velocity there are external environment, such as the influence of wind is highly prone to when certain error and measurement
The limited accuracy of measurement, precision be not high.
Invention content
It is an object of the invention to overcome current Optical imaging measurement technology in precision present on the measurement of raindrop terminal-velocity
The defects of not high, devises a kind of raindrop measuring device based on twin-line array, which can not only be imaged raindrop, and
And using two groups of photodiode arrays are integrated on one piece of senser element, it is capable of the terminal-velocity of accurate and effective measurement raindrop.
To achieve these goals, the present invention provides a kind of raindrop measuring device based on twin-line array, described device packets
It includes：Optical system, two-wire photodiode array, photoelectric signal collection processing circuit and data processing module；
The optical system, for exporting a collimation, the uniform laser beam of light distribution, direct irradiation is in two-wire photoelectricity
On diode array；And the raindrop for being captured to two-wire photodiode array are imaged；
The two-wire photodiode array be encapsulated on one piece of photo electric sensitive element the two row specifications that are arranged in parallel and
The completely the same photodiode array unit of performance；When there is raindrop to pass through, output passes through two photodiode array lists
The sprocket pulse signal of member is handled to photoelectric signal collection processing circuit；
The photoelectric signal collection processing circuit, for the timing arteries and veins exported to the two-wire photodiode array received
It rushes signal to be handled, calculates the terminal-velocity of raindrop, and in real time according to raindrop terminal-velocity and photodiode array Pixel Dimensions, more
The sample rate of new raindrop image, to raindrop, imaging is acquired and handles on photodiode array, obtains raindrop
Diameter and true picture；Then by treated, data are uploaded to data processing module；
The data processing module measures raindrop diameter for basis and raindrop speed calculates precipitation, rainfall intensity
With one or more of radar reflectivity degree of polarization parameter.
As a kind of improvement of above device, the optical imaging system includes：Light source, laser beam shaping module and into
As optical module；
The light source is a semiconductor laser, exports the uniform circular laser beam of a light distribution；
The laser beam shaping module is a lens, for the laser beam of light source output collimation is parallel for one
Laser beam；
The image optics module, for the lens by the way that different parameters are configured, realize to particle different resolution into
Picture.
As a kind of improvement of above device, the raindrop measuring device further includes heating module；For to the light source
Light-emitting window heated；The raindrop measuring device further includes multiple rain-proof components；The top of each rain-proof component is tip
Circular shape, the multiple rain-proof component are respectively arranged at the laser beam shaping module, image optics module and optical telecommunications
The top of number acquisition process circuit.
As a kind of improvement of above device, the image optics module uses the form that convex lens and concavees lens combine,
The ratio of image and particle size is 1:1.
As a kind of improvement of above device, the image optics module uses the combining form of biconvex lens, first
Convex lens realizes equal proportion amplification, and second convex lens realizes 4 times of enlargement ratios.
As a kind of improvement of above device, the two-wire photodiode array includes the first photodiode array list
Member and the second photodiode array unit；The first photodiode array unit and the second photodiode array unit
Distance s fix, the value range of s is 1mm~10mm；The photodiode array unit is made of N number of photodiode,
Wherein, 32≤N≤512；The light-receiving surface of the photodiode is square, ranging from 25 μm~200 μm of size dimension.
As a kind of improvement of above device, the photoelectric signal collection processing circuit includes：Analog signal processing
And FPGA control circuit；
The analog signal processing, the faint transient signal for being generated to two-wire photodiode array carry out fast
Fast response processing is supplied to one binary signal of FPGA control circuit of rear end；
The FPGA control circuit include fpga chip, for two-wire photodiode array for the first time there are raindrop when
The speed of raindrop is calculated, and sample rate is updated according to speed, raindrop image is acquired, obtains the diameter of raindrop, and will
Collected raindrop image data and parameter information carry out compression storage, and three road monitoring voltage values are acquired after a frame is filled with, even
Image data with compression is uploaded to data processing module by network.
As a kind of improvement of above device, the analog signal processing includes：Transimpedance amplifier U1, rear class letter
Number amplifying circuit U2, partial pressure emitter following circuit U 3 and comparison circuit U4；
The Transimpedance amplifier U1, the current signal for two-wire photodiode array to be exported are converted to voltage letter
Number；
The rear class signal amplification circuit U2, for the voltage signal of the output of Transimpedance amplifier U1 to be amplified；
The partial pressure emitter following circuit U 3, for providing a threshold reference potential being compared for comparison circuit U4；
The comparison circuit U4, for being compared to input signal and voltage threshold datum, output voltage is only
There are two types of：If representing high level with 1, low level is represented with 0 for high level or low level, then the output of comparison circuit U4 is being just
The state whether good and raindrop occur blocking is mapped.
The present invention also provides a kind of raindrop measuring method realized based on above-mentioned measuring device, the method includes：
Step 1) first passes through the first photodiode array unit when there is laser beam of the raindrop Jing Guo the light source output
When, which can export a pulse indication signal to fpga chip, and fpga chip, which can be recorded, at this time receives the pulse
Time t1；When raindrop continue to fall, and reach the second photodiode array unit, which can equally export a pulse and refer to
Show signal to fpga chip, which can be denoted as time t2 by fpga chip；The terminal-velocity of raindrop can be obtained after being computed：
Step 2) described device calculates the sample frequency of raindrop image according to the speed；And update the sampling of fpga chip
Rate is acquired raindrop image, obtains raindrop diameter information, and raindrop image after acquisition and processing and parameter information are used
Run- Length Coding compression algorithm is compressed；
Compressed raindrop image and supplemental characteristic are packaged by step 3), then by network by raindrop image data
It is transmitted to the data processing and display module；
Step 4) the data processing calculates precipitation, rainfall intensity, drop according to raindrop diameter and raindrop speed is measured
Water visibility and radar reflectivity.
As a kind of improvement of the above method, the sample frequency f that raindrop image is calculated according to the speed of the step 2)
Formula be：
F=vRes
Wherein, Res is the resolution ratio of optical system.
Advantage of the invention is that：
1st, measuring device of the invention is subtracted significantly by two groups integrated photodiode array on single photosensitive element
The distance of small two groups of photodiode arrays, can be while the size and shape to raindrop carries out imaging measurement, can also be to rain
Drippage speed is accurately measured.
2nd, the speed of measuring device raindrop obtained by calculation of the invention calculates fpga chip acquisition image most
It is excellent to use rate and be updated, can be more clear raindrop image.
Description of the drawings
Fig. 1 is the schematic diagram of the measuring device of the present invention；
Fig. 2 is the schematic diagram that tests the speed of apparatus of the present invention；
Fig. 3 is the schematic diagram of the measuring device of the present invention；
Fig. 4 is the schematic diagram of the optical system of the present invention；
Fig. 5 is the schematic diagram of the optical lens group of the equal proportion of the optical imagery module of the present invention；
Fig. 6 is the schematic diagram of the optical lens group of 4 times of the amplification of the optical imagery module of the present invention；
Fig. 7 is the schematic diagram of the analog signal processing of the present invention；
Fig. 8 is the schematic diagram of the FPGA control circuit of the present invention；
Fig. 9 is the precipitation particles image of device using the present invention reconstruct.
Specific embodiment
The present invention is described in detail in the following with reference to the drawings and specific embodiments.
The measuring principle of the raindrop measuring device based on twin-line array of the present invention is：Using it is a branch of collimation, light distribution compared with
For uniform laser, on the photosensitive element with two row photodiode arrays, two arrange direct irradiation after optical imaging system
Photodiode array parallel distribution, distance are fixed.When have particle pass through laser beam area when can block laser beam and through light
System imaging is learned on the photosensitive element with two row photodiode arrays, with certain frequency to two row photodiode battle arrays
Row are carried out at the same time scanning, after the signal after scanning is handled using subsequent circuit, any light battle array signal are selected to carry out group
Conjunction can obtain complete particle picture, as shown in Figure 1.In addition, raindrop have centainly when passing through two photodiode arrays
Time difference, and the distance of two photodiode arrays is fixed, as shown in Fig. 2, therefore by measuring this time difference
The speed that particle passes through instrument sample region can be obtained, as shown in formula (1)：
As shown in figure 3, a kind of raindrop measuring device based on twin-line array, described device includes optical system, two-wire photoelectricity
Diode array, photoelectric signal collection processing circuit and data processing and display module.
As shown in figure 4, the optical system includes：Light source, laser beam shaping module and image optics module；The light
Source is the semiconductor laser that a wavelength is 660nm, after optical shaping, one collimation of laser output, light distribution
Uniform circular laser beam, the imaged optical module direct irradiation of the light beam is on two-wire photodiode array.
Wherein, the light source is the semiconductor laser that a wavelength is 660nm, and one collimation of output, light distribution are uniform
Circular laser beam；The laser beam shaping module is a lens, for the laser beam of semiconductor laser to be collimated
The laser beam parallel for one；The optical imagery module uses the optical imaging concept of Kepler telescope, defeated from laser
Go out to the convex lens by choosing suitable parameter in the light path of detector element receiving plane so as to sample district center, i.e., two visit
Test arm intermediate point is object plane, and object on it can be clearly imaged in the plane using detector receiving plane as image planes,
And imaging is undistorted.It is fixed in entire light path, by the way that the lens of different parameters are configured, can realize to object not
With the imaging of resolution ratio.In practical application, the lens combination of two sets of different parameters can be selected, realize respectively to particle etc.
Ratio is imaged and 4 times of amplifications are imaged.The parameters such as the size of raindrop, shape can be got according to raindrop image.
As shown in figure 5, the form that the image optics module is combined using convex lens and concavees lens, convex lens realize contracting
Small, concavees lens realize amplification, and the ratio of last image and particle size is 1:1.
As shown in fig. 6, the ratios such as the image optics module uses the assembled scheme of biconvex lens, and first convex lens is realized
Example amplification, second convex lens realize 4 times of enlargement ratios.
The photoelectric signal collection processing circuit includes：Analog signal processing and FPGA control circuit；The two-wire
Photodiode array exports a current signal proportional to laser intensity, which passes through analog signal processing
The binary signal that can be directly acquired by FPGA control circuit, binary signal meeting after FPGA control circuit is handled can be converted to afterwards
It is compressed with certain data format, by gigabit Ethernet mouth, compressed data can be uploaded to data processing and show
Show that module is handled, shown and stored.The data processing and display module are run on host computer.
The analog signal processing is mainly that the faint transient signal generated to photodiode array carries out soon
Fast response processing, and it is supplied to one binary signal of FPGA control circuit of rear end.
As shown in fig. 7, the analog signal processing includes：Transimpedance amplifier U1, rear class signal amplification circuit U2,
Divide emitter following circuit U 3 and comparison circuit U4.
Wherein, the Transimpedance amplifier U1 is used to the current signal that photodiode exports being converted to voltage signal；
The rear class signal amplification circuit U2 is follow-up to meet for the voltage signal of the output of Transimpedance amplifier U1 to be amplified
Processing needs；The partial pressure emitter following circuit U 3 is used to provide a threshold reference potential being compared for comparison circuit U4；Institute
Comparison circuit U4 is stated for being compared to applied signal voltage, output voltage only there are two types of possible state, high level or
If representing high level with 1, low level is represented with 0 for low level, then whether the output of comparison circuit U4 just hides with particle
The state of gear is mapped.In the present embodiment, when laser directly shines, what light intensity that two-wire photodiode array receives generated
Threshold voltage of the half of voltage value as the sensor tributary unit comparison circuit is received with two-wire photodiode array
To laser intensity be weakened more than half when represent particle there is event.
The FPGA control circuit selects core cells of the fpga chip EP2C35F672C6N as entire circuit, and complete
Into the high-speed computations such as particle terminal-velocity and particle picture data compression coding.Entire FPGA control circuit block diagram is as shown in Figure 8.Configuration
The configuration information of module PROM EPCS16 storage systems, ADC chips TLC549 are used to read in the working condition of instrument, two lines
Each 64bits information of battle array sequentially inputs fpga chip after exclusion level conversion, is acquired by fpga chip.Go out when there is particle
Now, described device can occur the terminal-velocity that the particle moment does operation and calculate particle for the first time to two-wire photodiode array,
And update sample rate and particle picture is acquired, and collected particle picture data are subjected to compression storage, when being filled with one
Three road monitoring voltage values can be acquired after frame, are transmitted in a manner of network transmission toward host computer together with image data.
The two-wire photodiode array is complete to encapsulate out two row specifications and characteristics on one piece of photo electric sensitive element
Consistent photodiode array unit, including the first photodiode array unit and the second photodiode array unit；
The distance s of two photodiode array units is fixed, and the value range of s is 1mm~10mm, the photodiode array list
Member is made of N number of photodiode；Wherein, 32≤N≤512.The light-receiving surface of the photodiode is square, length of side ruler
Very little ranging from 25 μm~200 μm.When the amplification factor of image optics module is 1, the resolution ratio Res of instrument is 100 μm, this
When instrument measurement range be 100~6400 μm；When the amplification factor of image optics module is 4, the resolution ratio Res of instrument is
25 μm, ranging from 25~1600 μm of the measurement particle size of instrument.When particle from top to bottom passes through the first photodiode array
During unit, the array is because light intensity reduction can export a pulse signal to fpga chip, when which can be denoted as by fpga chip
Between t1；When particle continues to fall, and reaches the second photodiode array unit, which can equally export a pulse instruction
The moment can be denoted as time t2 by signal to fpga chip, fpga chip.
The Microphysical attribute important as Precipitation Process, the measurement of precipitation particles size, shape and terminal-velocity is for precipitation
Process understands and its in weather with having great importance in the parametrization in climatic model.Based on two-wire photodiode battle array
The surface precipitation particle and its terminal-velocity of row, which measure, mainly utilizes a collimation, light distribution photograph more direct than more uniform laser beam
It is mapped on sensor photodiode array, entire photoelectricity two can be covered all after the imaged optical module of the laser beam spot
Pole pipe array.Laser beam irradiation under, each sensing unit can generate one with its own received by laser intensity into just
The current value of ratio.When there is particle to pass through laser beam area, the laser intensity being irradiated on sensing unit is since particle blocks hair
Variation has been given birth to, so that the current value that sensing unit generates changes, has caused the light energy changing value of each unit variation：
In formula：The light energy of array element output constant signal, projected areas of a for particle, A when E is blocked for no particle
Capture area for array element.Since particle blocks light, mainly to the scattering of light and absorption, i.e. delustring causes
's.Introducing extinction coefficient can obtain：
In formula (3), KeFor particle extinction coefficient.According to Mie scattering theories, when particle diameter is more than 2 μm or so,
Extinction coefficient K in formula (3)eGenerally take its approximation 2.Therefore work asWhen, Δ E=0, at this moment it is considered that the array list
Member is blocked completely.Therefore, occur with particle, more than 50% optical energy attenuation that photodiode unit is received is threshold value.When
When any cell occurs meeting optical energy attenuation threshold condition, the electric current which is exported is after analog signal processing is handled
A pulse signal can be formed, perception is acquired by FPGA control circuit.Particle is being perceived behind instrument sample region, FPGA cores
Sector-meeting is detected the electric current of photodiode each on sensor array with certain frequency f and the signal to detecting carries out
Processing.
The primary one group of acquired signal of every processing is known as 1 line (slice), when a plurality of line that sampling is obtained
(slice) when signal is according to sequential concatenation is obtained together, the image of raindrop can be reconstructed and measure the size of raindrop, such as schemed
Shown in 9, Nx and Ny are unit number of the raindrop in the upward shared maximum of two vertical axises respectively, and unit number is multiplied by point of instrument
Resolution can obtain the particle size of raindrop in different directions.Particle axis can also be obtained after calculating particle diameter
Than important parameter informations such as, raininess and radar reflectivitys.The sample frequency f sampled to light battle array signal is determined by following formula：
F=v/Res (4)
Wherein, Res is the resolution ratio of instrument.Therefore the sample frequency of instrument is determined to accurately measuring for raindrop terminal-velocitys
Accuracy, and whether instrument sample frequency accurately determines whether surveyed precipitation particles image is accurate, and then influences instrument
To the accuracy of precipitation particles physical parameters measurement.Since the size shape of precipitation particles differs, atmospheric environment situation during measurement
Also it is not quite similar, the terminal-velocity of each precipitation particles is caused also to be not quite similar, it is therefore desirable to the terminal-velocity of each precipitation particles
Carry out accurate measure with its determining suitable sample frequency.
In order to solve the problems, such as raindrop terminal-velocity measurement accuracy, the present invention is proposed in the output arteries and veins for getting two column arrays
After rushing the time, according to formulaFpga chip can calculate raindrop terminal-velocity automatically.With reference to the resolution ratio Res of instrument,
The particle picture sample rate f of instrument can be calculated.
The step of measuring method of raindrop speed is：
After the step 1) measuring device is powered, into init state；
Step 2) can pass through two row photodiode array units successively when there is raindrop to pass through device sample region；When it
When first passing through the first photodiode array unit, which can export a pulse indication signal to fpga chip, at this time
Fpga chip can record the time t1 for receiving the pulse；When raindrop continue to fall, the first photodiode array list is reached
When first, which can equally export a pulse indication signal to fpga chip, which can be denoted as time t2 by fpga chip.
The terminal-velocity of raindrop can be obtained after being computed, it can be with the sample frequency of adjust automatically raindrop image according to the speed；
Step 3) described device adjusts image-sampling frequency, and raindrop image is acquired and handled, and to acquiring and locating
Signal after reason is compressed using Run- Length Coding compression algorithm；
The compressed data of step 4) can be packaged, then by cable, in a manner of the network transmission of UDP, by raindrop
Image data is transmitted to the data processing and display module；
Step 5) the data processing and display module can carry out statistical disposition, display and storage to the data of upload.
It should be noted last that the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be understood by those of ordinary skill in the art that, to the technical side of the present invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Right in.
Claims (10)
1. a kind of raindrop measuring device based on twin-line array, which is characterized in that described device includes optical system, two-wire photoelectricity two
Pole pipe array, photoelectric signal collection processing circuit and data processing module；
The optical system, for exporting a collimation, the uniform laser beam of light distribution, direct irradiation is in two pole of two-wire photoelectricity
On pipe array；And the raindrop for being captured to two-wire photodiode array are imaged；
The two-wire photodiode array is that two row specifications and characteristics being arranged in parallel are encapsulated on one piece of photo electric sensitive element
Completely the same photodiode array unit；When there is raindrop to pass through, output passes through two photodiode array units
Sprocket pulse signal is handled to photoelectric signal collection processing circuit；
The photoelectric signal collection processing circuit, for the sprocket pulse letter exported to the two-wire photodiode array received
It number is handled, calculates the terminal-velocity of raindrop, and in real time according to raindrop terminal-velocity and photodiode array Pixel Dimensions, more rain in early spring
The sample rate of image is dripped, imaging is acquired and handles on photodiode array to raindrop, obtains the diameter of raindrop
And true picture；Then by treated, data are uploaded to data processing module；
The data processing module measures raindrop diameter for basis, raindrop speed calculates precipitation, rainfall intensity and radar
One or more of reflectivity degree of polarization parameter.
2. the raindrop measuring device according to claim 1 based on twin-line array, which is characterized in that the optical system packet
It includes：Light source, laser beam shaping module and image optics module；
The light source is a semiconductor laser, exports the uniform circular laser beam of a light distribution；
The laser beam shaping module is a lens, for being a parallel laser by the laser beam of light source output collimation
Beam；
The image optics module for the lens by the way that different parameters are configured, realizes the imaging to particle different resolution.
3. raindrop measuring device according to claim 2, which is characterized in that the raindrop measuring device further includes heated mould
Block；It is heated for the light-emitting window to the light source；The raindrop measuring device further includes multiple rain-proof components；Each rain-proof
The top of component is tip arc shape, and the multiple rain-proof component is respectively arranged at the laser beam shaping module, imaging
The top of optical module and photoelectric signal collection processing circuit.
4. the raindrop measuring device according to claim 2 based on twin-line array, which is characterized in that the image optics module
The ratio of the form combined using convex lens and concavees lens, image and particle size is 1:1.
5. the raindrop measuring device according to claim 2 based on twin-line array, which is characterized in that the image optics module
Using the combining form of biconvex lens, first convex lens realizes equal proportion amplification, and second convex lens realizes 4 times of times magnifications
Rate.
6. the raindrop measuring device according to claim 1 based on twin-line array, which is characterized in that two pole of two-wire photoelectricity
Pipe array includes the first photodiode array unit and the second photodiode array unit；The first photodiode battle array
The distance s of column unit and the second photodiode array unit is fixed, and the value range of s is 1mm~10mm；Two pole of photoelectricity
Pipe array element is made of N number of photodiode, wherein, 32≤N≤512；The light-receiving surface of the photodiode is square,
Ranging from 25 μm~200 μm of its size dimension.
7. the raindrop measuring device according to claim 1 based on twin-line array, which is characterized in that the photoelectric signal collection
Processing circuit includes：Analog signal processing and FPGA control circuit；
The analog signal processing, for quickly being rung to the faint transient signal that two-wire photodiode array generates
It should handle, be supplied to one binary signal of FPGA control circuit of rear end；
The FPGA control circuit includes fpga chip, for being calculated when there are raindrop for the first time to two-wire photodiode array
Go out the speed of raindrop, and sample rate is updated according to speed, raindrop image is acquired, obtain the diameter of raindrop, and will acquisition
To raindrop image data and parameter information carry out compression storage, three road monitoring voltage values are acquired after a frame is filled with, together with pressure
The image data of contracting is uploaded to data processing module by network.
8. the raindrop measuring device according to claim 5 based on twin-line array, which is characterized in that the front end signal conditioning
Circuit includes：Transimpedance amplifier U1, rear class signal amplification circuit U2, partial pressure emitter following circuit U 3 and comparison circuit U4；
The Transimpedance amplifier U1, the current signal for two-wire photodiode array to be exported are converted to voltage signal；
The rear class signal amplification circuit U2, for the voltage signal of the output of Transimpedance amplifier U1 to be amplified；
The partial pressure emitter following circuit U 3, for providing a threshold reference potential being compared for comparison circuit U4；
The comparison circuit U4, for being compared to input signal and voltage threshold datum, output voltage only has two
Kind：If representing high level with 1, low level is represented with 0 for high level or low level, then the output of comparison circuit U4 just and
The state whether raindrop occur blocking is mapped.
9. the raindrop measuring method that a kind of measuring device based on described in one of claim 1-8 is realized, the method includes：
Step 1) is when there is laser beam of the raindrop Jing Guo the light source output, when first passing through the first photodiode array unit,
The unit can export a pulse indication signal to fpga chip, and fpga chip can record the time for receiving the pulse at this time
t1；When raindrop continue to fall, and reach the second photodiode array unit, which can equally export a pulse instruction letter
Number to fpga chip, which can be denoted as time t2 by fpga chip；The terminal-velocity of raindrop can be obtained after being computed：
Step 2) described device calculates the sample frequency of raindrop image according to the speed；And the sample rate of fpga chip is updated, it is right
Raindrop image is acquired, and obtains raindrop diameter information, and use the distance of swimming to raindrop image after acquisition and processing and parameter information
Coding compression algorithm is compressed；
Compressed raindrop image and supplemental characteristic are packaged by step 3), are then transmitted raindrop image data by network
To the data processing and display module；
Step 4) the data processing calculates precipitation, rainfall intensity, precipitation energy according to raindrop diameter and raindrop speed is measured
Degree of opinion and radar reflectivity.
10. a kind of raindrop measuring method based on described in claim 9, which is characterized in that the step 2) according to the speed
The formula of sample frequency f for calculating raindrop image is：
F=v/Res
Wherein, Res is the resolution ratio of optical system.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810078233.1A CN108227044B (en) | 2018-01-26 | 2018-01-26 | Raindrop measuring device and method based on double-linear array |
| US16/960,900 US11828905B2 (en) | 2018-01-26 | 2018-02-11 | Dual line diode array device and measurement method and measurement device for particle velocity |
| FI20205820A FI130492B (en) | 2018-01-26 | 2018-02-11 | Dual line diode array device and measurement method and measurement device for particle velocity |
| PCT/CN2018/076211 WO2019144443A1 (en) | 2018-01-26 | 2018-02-11 | Dual wire diode array device and measurement method and measurement device for particle velocity |
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