CN108562762B - Ocean droplet measuring device and method based on double linear arrays - Google Patents
Ocean droplet measuring device and method based on double linear arrays Download PDFInfo
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- CN108562762B CN108562762B CN201810077744.1A CN201810077744A CN108562762B CN 108562762 B CN108562762 B CN 108562762B CN 201810077744 A CN201810077744 A CN 201810077744A CN 108562762 B CN108562762 B CN 108562762B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N15/0205—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging
- G01N15/0227—Investigating particle size or size distribution by optical means, e.g. by light scattering, diffraction, holography or imaging using imaging, e.g. a projected image of suspension; using holography
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/02—Investigating particle size or size distribution
- G01N2015/0294—Particle shape
Abstract
The invention discloses an ocean droplet measuring device based on a double-linear array, which comprises an optical system, a double-line photodiode array, a photoelectric signal acquisition processing circuit and a data processing and display module, wherein the photoelectric signal acquisition processing circuit is connected with the optical system; the optical system is used for outputting a collimated laser beam with uniform light intensity distribution and directly irradiating the laser beam on the double-line photodiode array; and for imaging the captured marine spray; the double-line photodiode array is formed by packaging two rows of photodiode array units which are arranged in parallel and have completely consistent specifications and performances on a photoelectric sensing element; the photoelectric signal acquisition processing circuit processes the received timing pulse signals output by the double-line photodiode array, calculates the speed of the marine droplets, updates the sampling rate of the marine droplet particle images in real time, acquires and processes the images of the marine droplets on the photodiode array, and uploads the processed data to the data processing and display module.
Description
Technical Field
The invention relates to the field of particle measurement, in particular to a device and a method for measuring marine droplets based on a double-linear array.
Background
Marine spray refers to the presence of various water droplets of different sizes in the air near the sea surface, which are produced by the combined action of wind and waves. Under the combined action of gravity and turbulence, larger seawater droplets can fall back to the sea surface again in a short time, but in the process, the evaporation process of the large droplets can influence the sea-air interface process through heat and momentum exchange; smaller seawater droplets can rise to high altitude and suspend in the atmosphere for a long time under the action of atmospheric turbulence, and are also called as marine aerosol. The ocean aerosol occupies 44% of the global aerosol, and as a cloud condensation nucleus, the ocean aerosol can have great influence on the micro-physical and chemical properties of ocean layer cloud, and is one of the largest uncertain factors for climate prediction. Measurements of the particle size and the speed of flight of the marine spray therefore help to understand the effect of the marine spray during the sea-gas interaction and its impact on the climate.
The early ocean droplet observation method mainly uses reagent paper to observe seawater droplets generated by ocean wave breaking, but the method needs a large amount of manual work, has low efficiency and can only measure large seawater droplets. In recent years, optical-based marine droplet measurements have found widespread use. The optical-based marine droplet measurement can be specifically classified into an optical scattering-based measurement technique and an optical imaging-based measurement technique. The measurement technique based on optical scattering can measure the size of particles, but cannot acquire specific shape and velocity information of the particles, and the range of the measured particle size is limited. The measurement technology of optical imaging can record the image of particles and can acquire the shape information of the particles according to the image of the particles, but the existing optical imaging technology cannot acquire the speed information of the marine droplets. The invention realizes accurate measurement of the particle size and speed information of the marine droplets by using the double-linear-array imaging measurement technology, and fills the blank of the current marine droplet measurement field.
Disclosure of Invention
The invention aims to overcome the defects of the existing optical imaging measurement technology in ocean droplet measurement, and designs an ocean droplet measurement device based on a double-linear array.
In order to achieve the above object, the present invention provides a double-linear-array-based marine droplet measurement apparatus, comprising: the device comprises an optical system, a double-wire photodiode array, a photoelectric signal acquisition and processing circuit and a data processing and display module;
the optical system is used for outputting a collimated laser beam with uniform light intensity distribution and directly irradiating the laser beam on the double-line photodiode array; and is used for imaging the marine droplets captured by the two-wire photodiode array;
the double-line photodiode array is formed by packaging two rows of photodiode array units which are arranged in parallel and have completely consistent specifications and performances on a photoelectric sensing element; when ocean spray passes through, timing pulse signals passing through the two photodiode array units are output to the photoelectric signal acquisition and processing circuit for processing;
the photoelectric signal acquisition processing circuit processes the received timing pulse signals output by the double-line photodiode array, calculates the speed of the marine droplets, updates the sampling rate of the marine droplet particle images in real time, acquires and processes the images of the marine droplets on the photodiode array, and uploads the processed data to the data processing and display module.
As an improvement of the above apparatus, the optical system includes: the device comprises a light source, a laser beam shaping module and an imaging optical module;
the light source is a semiconductor laser and outputs a circular laser beam with uniform light intensity distribution;
the laser beam shaping module is a lens and is used for collimating the laser beam output by the light source into a parallel laser beam;
the imaging optical module is used for realizing imaging of different resolutions of particles by configuring lenses with different parameters.
As an improvement of the above device, the imaging optical module takes the form of a combination of a convex lens and a concave lens, with a ratio of image to particle size of 1: 1.
As an improvement of the above apparatus, the imaging optical module employs a combination of double convex lenses, the first convex lens achieving an equal magnification, and the second convex lens achieving a magnification of 4 times.
As an improvement of the above apparatus, the two-wire photodiode array includes a first photodiode array unit and a second photodiode array unit; the distance s between the first photodiode array unit and the second photodiode array unit is fixed, and the value range of s is 1-10 mm; each photodiode array unit consists of N photodiodes, wherein N is more than or equal to 32 and less than or equal to 512; the light receiving surface of the photodiode is square, and the side length size range of the photodiode is 25-200 mu m.
As an improvement of the above device, the optoelectronic signal acquisition and processing circuit includes: a front-end signal conditioning circuit and an FPGA control circuit;
the front-end signal conditioning circuit is used for performing quick response processing on a weak transient signal generated by the double-line photodiode array and providing the weak transient signal to the FPGA control circuit at the rear end to form a binary signal;
the FPGA control circuit comprises an FPGA chip and is used for calculating the speed of marine droplets when the marine droplets appear in the double-line photodiode array for the first time, updating the sampling rate according to the speed, collecting particle images, compressing and storing collected marine droplet image data, collecting three monitoring voltage values after one frame is stored, and uploading the three monitoring voltage values together with the compressed image data to the data processing and display module through a network.
As an improvement of the above apparatus, the front-end signal conditioning circuit includes: the circuit comprises a transimpedance amplifying circuit U1, a post-stage signal amplifying circuit U2, a voltage division emission following circuit U3 and a comparison circuit U4;
the transimpedance amplification circuit U1 is used for converting a current signal output by the two-wire photodiode array into a voltage signal;
the post-stage signal amplifying circuit U2 is used for amplifying the voltage signal output by the transimpedance amplifying circuit U1;
the voltage division emission follow-up circuit U3 is used for providing a threshold reference level for comparison for the comparison circuit U4;
the comparison circuit U4 is used for comparing the input signal with a voltage threshold reference level, and the output voltage is only two: high or low, if 1 is used to indicate high and 0 is used to indicate low, the output of the comparator U4 corresponds to whether particles are blocked or not.
The invention also provides a marine droplet measurement method based on the measurement device, which comprises the following steps:
step 1) when ocean spray passes through a laser beam output by the light source and firstly passes through the first photodiode array unit, the unit outputs a pulse indication signal to the FPGA chip, and at the moment, the FPGA chip records the time t1 when the pulse is received; when the ocean droplets continuously fly and reach the second photodiode array unit, the unit also outputs a pulse indication signal to the FPGA chip, and the FPGA chip records the moment as time t 2; the speed of the marine spray can be obtained after calculation:
step 2) the device calculates the sampling frequency of the marine droplet image according to the speed; updating the sampling rate of the FPGA chip, acquiring the marine droplet image, and compressing the marine droplet image data by adopting a run length coding compression algorithm for the acquired signal;
step 3) packing the compressed marine droplet image data, and then transmitting the marine droplet image data to the data processing and displaying module through a network;
and 4) the data processing and displaying module carries out statistical processing, displaying and storing on the uploaded data.
As an improvement of the above method, the formula of step 2) for calculating the sampling frequency f of the marine droplet image according to the speed is as follows:
f＝v/Res
where Res is the resolution of the optical system.
The invention has the advantages that:
1. the measuring device of the invention integrates two groups of photodiode arrays on a single photosensitive element, greatly reduces the distance between the two groups of photodiode arrays, can perform imaging measurement on the size and shape of the marine spray, and can also accurately measure the flying speed of the marine spray.
2. According to the measuring device, the optimal utilization rate of the image acquired by the FPGA chip is calculated and updated according to the calculated speed of the marine droplets, so that the marine droplet image can be more accurate and clear.
Drawings
FIG. 1 is a schematic diagram of a measuring device of the present invention;
FIG. 2 is a schematic diagram of the device of the present invention;
FIG. 3 is a schematic view of a measuring device of the present invention;
FIG. 4 is a schematic diagram of an optical system of the present invention;
FIG. 5 is a schematic illustration of an isometric optical lens group of an imaging optical module of the present invention;
FIG. 6 is a schematic view of an optical lens group of the imaging optical module of the present invention magnified 4 times;
FIG. 7 is a schematic diagram of a front-end signal conditioning circuit according to the present invention;
FIG. 8 is a schematic diagram of an FPGA control circuit of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The measurement principle of the ocean droplet measurement device based on the double-linear array is as follows: a laser beam with collimation and uniform light intensity distribution is directly irradiated on a photosensitive element with two rows of photodiode arrays after passing through an optical imaging system, and the two rows of photodiode arrays are distributed in parallel with a fixed distance. When particles pass through the laser beam area, the laser beams are blocked and imaged on a photosensitive element with two rows of photodiode arrays through an optical system, the two rows of photodiode arrays are scanned simultaneously at a certain frequency, scanned signals are processed by a subsequent circuit, and any one of the optical array signals is selected to be combined to obtain a complete marine droplet image, as shown in fig. 1. In addition, the marine spray has a certain time difference when passing through the two photodiode arrays, and the distance between the two photodiode arrays is fixed, as shown in fig. 2, so that the speed of the marine spray passing through the sampling area of the instrument can be obtained by measuring the time difference, as shown in formula (1):
as shown in fig. 3, the marine droplet measuring device based on the double-wire array comprises an optical system, a double-wire photodiode array, a photoelectric signal acquisition and processing circuit and a data processing and display module.
As shown in fig. 4, the optical system includes: the device comprises a light source, a laser beam shaping module and an imaging optical module; the light source is a semiconductor laser with the wavelength of 660nm, after optical shaping, the laser outputs a round laser beam which is collimated and has uniform light intensity distribution, and the light beam directly irradiates the double-line photodiode array through the imaging optical module.
Wherein, the light source is a semiconductor laser with the wavelength of 660nm and outputs a round laser beam with collimation and uniform light intensity distribution; the laser beam shaping module is a lens and is used for collimating the laser beam of the semiconductor laser into a parallel laser beam; the optical imaging module adopts the optical imaging principle of a Keplerian telescope, and a convex lens with proper parameters is selected on a light path output from a laser to a receiving surface of a detector element, so that an object on the optical imaging module can be clearly imaged on a plane taking the receiving surface of the detector as an image surface by taking the center of a sampling area, namely the middle point of two detection arms as an object surface, and the imaging is free from distortion. Under the condition that the whole optical path is fixed, the imaging of different resolutions of the object can be realized by configuring the lenses with different parameters. In practical application, two sets of lens combinations with different parameters can be selected, and equal-proportion imaging and 4-time magnification imaging of particles are respectively realized. The parameters such as size, shape and the like of the marine droplets can be acquired according to the marine droplet image.
As shown in fig. 5, the imaging optical module adopts a form of a combination of a convex lens and a concave lens, the convex lens realizes reduction, the concave lens realizes enlargement, and finally the ratio of the image to the particle size is 1: 1.
As shown in fig. 6, the imaging optical module adopts a combination scheme of a biconvex lens, where the first convex lens realizes equal-scale magnification and the second convex lens realizes 4-fold magnification.
The photoelectric signal acquisition processing circuit comprises: a front-end signal conditioning circuit and an FPGA control circuit; the double-line photodiode array outputs a current signal proportional to the light intensity of the laser, the current signal is converted into a binary signal which can be directly collected by the FPGA control circuit after passing through the front-end signal conditioning circuit, the binary signal is compressed in a certain data format after being processed by the FPGA control circuit, and the compressed data can be uploaded to the data processing and displaying module for processing, displaying and storing through the gigabit Ethernet port. And the data processing and displaying module runs on the upper computer.
The front-end signal conditioning circuit is mainly used for carrying out quick response processing on a weak transient signal generated by the photodiode array and providing the weak transient signal to the FPGA control circuit at the rear end to form a binary signal.
As shown in fig. 7, the front-end signal conditioning circuit includes: the circuit comprises a transimpedance amplifying circuit U1, a post-stage signal amplifying circuit U2, a voltage division emission following circuit U3 and a comparison circuit U4.
The transimpedance amplification circuit U1 is configured to convert a current signal output by a photodiode into a voltage signal; the post-stage signal amplifying circuit U2 is used for amplifying the voltage signal output by the transimpedance amplifying circuit U1 so as to meet the requirement of subsequent processing; the voltage division follower circuit U3 is used for providing a threshold reference level for comparison for the comparison circuit U4; the comparing circuit U4 is used to compare the input signal voltage, and its output voltage has only two possible states, high level or low level, if 1 is used to represent high level, and 0 is used to represent low level, the output of the comparing circuit U4 just corresponds to the state whether the particle is blocked or not. In this embodiment, when the laser is directly irradiated, half of the voltage value generated by the light intensity received by the two-wire photodiode array is used as the threshold voltage of the comparison circuit of the sensor branch unit, that is, when the light intensity of the laser received by the two-wire photodiode array is weakened by more than half, it indicates that a particle occurs.
The FPGA control circuit selects an FPGA chip EP2C35F672C6N as a core unit of the whole circuit, and completes high-speed operations such as ocean spray speed and ocean spray image data compression coding. The whole FPGA control circuit block diagram is shown in FIG. 8. The configuration module PROM EPCS16 stores the configuration information of the system, the ADC chip TLC549 is used for reading the working state of the instrument, the 64bits information of each linear array is input into the FPGA chip in sequence after being subjected to exclusion level conversion, and the information is collected by the FPGA chip. When particles appear, the device can calculate the falling speed of the particles by carrying out operation on the moment when the particles appear for the first time in the double-line photodiode array, updates the sampling rate to collect particle images, compresses and stores the collected particle image data, collects three paths of monitoring voltage values after one frame is stored, and transmits the three paths of monitoring voltage values together with the image data to an upper computer in a network transmission mode.
The double-line photodiode array is formed by packaging two rows of photodiode array units with completely consistent specifications and performances on one photoelectric sensing element, and comprises a first photodiode array unit and a second photodiode array unit; the distance s between the two photodiode array units is fixed, the value range of s is 1-10 mm, and each photodiode array unit consists of N photodiodes; wherein N is more than or equal to 32 and less than or equal to 512. The light receiving surface of the photodiode is square, and the side length size range of the photodiode is 25-200 mu m; when the magnification of the imaging optical module is 1, the resolution Res of the instrument is 100 mu m, and the measurement range of the instrument is 100-6400 mu m; when the magnification of the imaging optical module is 4, the resolution Res of the instrument is 25 μm, and the size of the measured particles of the instrument is 25-1600 μm. When the particles pass through the first photodiode array unit from top to bottom, the array outputs a pulse signal to the FPGA chip due to the reduction of light intensity, and the FPGA chip marks the moment as time t 1; when the particles continue to fall and reach the second photodiode array unit, the array will also output a pulse indication signal to the FPGA chip, and the FPGA chip will record the time as time t 2.
The marine spray based on double-line photodiode array and its speed measurement are mainly characterized by that it utilizes a collimated laser beam whose light intensity distribution is relatively uniform to directly irradiate on the sensor photodiode array, and the laser beam spot can completely cover whole photodiode array after passing through imaging optical module. Under the irradiation of laser beams, each sensing unit generates a current value which is in direct proportion to the intensity of the laser received by the sensing unit. When ocean spray passes through a laser beam area, the intensity of laser irradiated on the sensing unit is changed due to the shielding of the ocean spray, so that the current value generated by the sensing unit is changed, and the light energy change value of each unit is caused:
in the formula: e is the light energy of the constant signal output by the array unit when no ocean spray is shielded, a is the projection area of the ocean spray, and A is the effective receiving area of the array unit. Due to the shielding of light by the marine spray, it is mainly caused by scattering and absorption of light, i.e. extinction. The introduction of extinction coefficient can obtain:
in the formula (3), KeThe extinction coefficient of the particles. According to Mie scattering theory, the extinction coefficient K in formula (3) is higher than about 2 μmeGenerally, an approximation of 2 is taken. Thus when
When Δ E is 0, the array element may be considered to be completely blocked. Therefore, when the ocean droplet appears, the light energy received by the photodiode unit is attenuated by 50% or more as a threshold value. When any unit meets the condition of meeting the optical energy attenuation threshold, the current output by the unit forms a pulse signal after being processed by the front-end signal conditioning circuit, and the pulse signal is collected and sensed by the FPGA control circuit. After sensing that particles pass through an instrument sampling area, the FPGA chip detects the current of each photodiode on the sensor array at a certain frequency f and processes the detected signals.
The sampling frequency f for sampling the optical array signal is determined by the following formula:
f＝v/Res (4)
where Res is the resolution of the instrument. Therefore, the accuracy of the sampling frequency of the instrument is determined by the accurate measurement of the speed of the marine droplets, and the accuracy of the sampling frequency of the instrument is determined by the accuracy of the measured marine droplet image, so that the accuracy of the instrument for measuring the physical parameters of the marine droplets is influenced. Because the size of the marine droplets is different, the atmospheric environment conditions are different during measurement, so that the speed of each marine droplet is different, and therefore, the speed of each marine droplet needs to be accurately measured to determine the appropriate sampling frequency.
The measuring steps of the marine spray speed are as follows:
step 1), after the measuring device is powered on, entering an initialization state;
step 2) when ocean spray passes through the sampling area of the device, the ocean spray sequentially passes through two rows of photodiode array units; when the pulse signal passes through the first photodiode array unit, the unit outputs a pulse indication signal to the FPGA chip, and the FPGA chip records the time t1 when the pulse signal is received; when the ocean droplets continuously fly and reach the first photodiode array unit, the unit also outputs a pulse indication signal to the FPGA chip, and the FPGA chip records the moment as time t 2. The speed of the marine spray can be obtained after calculation; the sampling frequency of the marine droplet image can be automatically adjusted according to the speed;
step 3) the device adjusts the image sampling frequency, collects the particle image, and compresses the particle image data by adopting a run length coding compression algorithm to the collected signal;
step 4), the compressed marine droplet image data is packaged, and then the marine droplet image data is transmitted to the data processing and displaying module through a network cable in a UDP network transmission mode;
and 5) the data processing and displaying module carries out statistical processing, displaying and storing on the uploaded data.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The marine droplet measuring device based on the double-wire array is characterized by comprising an optical system, a double-wire photodiode array, a photoelectric signal acquisition processing circuit and a data processing and display module;
the optical system is used for outputting a collimated laser beam with uniform light intensity distribution and directly irradiating the laser beam on the double-line photodiode array; and is used for imaging the marine droplets captured by the two-wire photodiode array;
the double-line photodiode array is formed by packaging two rows of photodiode array units which are arranged in parallel and have completely consistent specifications and performances on a photoelectric sensing element; when ocean spray passes through, timing pulse signals passing through the two photodiode array units are output to the photoelectric signal acquisition and processing circuit for processing;
the photoelectric signal acquisition processing circuit processes the received timing pulse signals output by the double-line photodiode array, calculates the speed of the marine droplets, updates the sampling rate of the marine droplet particle images in real time, acquires and processes the images of the marine droplets on the photodiode array, and uploads the processed data to the data processing and display module.
2. The twin wire array based marine droplet measurement device of claim 1, wherein the optical system comprises: the device comprises a light source, a laser beam shaping module and an imaging optical module;
the light source is a semiconductor laser and outputs a circular laser beam with uniform light intensity distribution;
the laser beam shaping module is a lens and is used for collimating the laser beam output by the light source into a parallel laser beam;
the imaging optical module is used for realizing imaging of different resolutions of particles by configuring lenses with different parameters.
3. The twin line array based marine droplet measurement device of claim 2, wherein the imaging optics module is in the form of a combination of convex and concave lenses, with a ratio of image to particle size of 1: 1.
4. The twin-wire array based marine droplet measurement apparatus of claim 2, wherein the imaging optics module is in the form of a combination of biconvex lenses, the first convex lens achieving equal magnification and the second convex lens achieving 4 times magnification.
5. The twin wire array based marine droplet measurement device of claim 1, wherein the twin wire photodiode array comprises a first photodiode array unit and a second photodiode array unit; the distance s between the first photodiode array unit and the second photodiode array unit is fixed, and the value range of s is 1-10 mm; each photodiode array unit consists of N photodiodes, wherein N is more than or equal to 32 and less than or equal to 512; the light receiving surface of the photodiode is square, and the side length size range of the photodiode is 25-200 mu m.
6. The twin wire array based marine droplet measurement device of claim 1, wherein the optoelectronic signal acquisition and processing circuitry comprises: a front-end signal conditioning circuit and an FPGA control circuit;
the front-end signal conditioning circuit is used for performing quick response processing on a weak transient signal generated by the double-line photodiode array and providing the weak transient signal to the FPGA control circuit at the rear end to form a binary signal;
the FPGA control circuit comprises an FPGA chip and is used for calculating the speed of marine droplets when the marine droplets appear in the double-line photodiode array for the first time, updating the sampling rate according to the speed, collecting particle images, compressing and storing collected marine droplet image data, collecting three monitoring voltage values after one frame is stored, and uploading the three monitoring voltage values together with the compressed image data to the data processing and display module through a network.
7. The twin wire array based marine droplet measurement device of claim 6, wherein the front end signal conditioning circuit comprises: the circuit comprises a transimpedance amplifying circuit U1, a post-stage signal amplifying circuit U2, a voltage division emission following circuit U3 and a comparison circuit U4;
the transimpedance amplification circuit U1 is used for converting a current signal output by the two-wire photodiode array into a voltage signal;
the post-stage signal amplifying circuit U2 is used for amplifying the voltage signal output by the transimpedance amplifying circuit U1;
the voltage division emission follow-up circuit U3 is used for providing a threshold reference level for comparison for the comparison circuit U4;
the comparison circuit U4 is used for comparing the input signal with a voltage threshold reference level, and the output voltage is only two: high or low, if 1 is used to indicate high and 0 is used to indicate low, the output of the comparator U4 corresponds to whether particles are blocked or not.
8. A method of marine droplet measurement based on the measurement device of one of claims 1-7, the method comprising:
step 1) when ocean spray passes through a laser beam output by the optical system and firstly passes through the first photodiode array unit, the unit outputs a pulse indication signal to the FPGA chip, and at the moment, the FPGA chip records the time t1 when the pulse is received; when the ocean droplets continuously fly and reach the second photodiode array unit, the unit also outputs a pulse indication signal to the FPGA chip, and the FPGA chip records the moment as time t 2; the speed of the marine spray can be obtained after calculation:
step 2) the device calculates the sampling frequency of the marine droplet image according to the speed; updating the sampling rate of the FPGA chip, acquiring the marine droplet image, and compressing the marine droplet image data by adopting a run length coding compression algorithm for the acquired signal;
step 3) packing the compressed marine droplet image data, and then transmitting the marine droplet image data to the data processing and displaying module through a network;
and 4) the data processing and displaying module carries out statistical processing, displaying and storing on the uploaded data.
9. The marine droplet measurement method according to claim 8, wherein the formula of step 2) for calculating the sampling frequency f of the marine droplet image according to the velocity is:
f＝v/Res
where Res is the resolution of the optical system.
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| CN201810077744.1A CN108562762B (en) | 2018-01-26 | 2018-01-26 | Ocean droplet measuring device and method based on double linear arrays |
| 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 |
| 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 |
| FI20205820A FI130492B (en) | 2018-01-26 | 2018-02-11 | Dual line diode array device and measurement method and measurement device for particle velocity |
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