CN107422337A - A kind of Atmospheric Survey laser radar - Google Patents
A kind of Atmospheric Survey laser radar Download PDFInfo
- Publication number
- CN107422337A CN107422337A CN201710727429.4A CN201710727429A CN107422337A CN 107422337 A CN107422337 A CN 107422337A CN 201710727429 A CN201710727429 A CN 201710727429A CN 107422337 A CN107422337 A CN 107422337A
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- laser
- laser radar
- laser beam
- atmospheric survey
- fpga
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- 239000004065 semiconductor Substances 0.000 claims abstract description 12
- 230000003993 interaction Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 230000005693 optoelectronics Effects 0.000 claims abstract description 5
- 238000007493 shaping process Methods 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 9
- 239000003570 air Substances 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 241000931526 Acer campestre Species 0.000 description 4
- 239000000443 aerosol Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000008264 cloud Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The present invention relates to a kind of Atmospheric Survey laser radar, belong to laser radar technique field.Including emission system, reception system and data handling system, the emission system is made up of impulse semiconductor laser and photodiode, impulse semiconductor laser launches laser beam, laser beam after object interaction with producing return laser beam, reception system is supplied to by photodiode, the reception system uses PMT modules, after PMT modules carry out opto-electronic conversion and data acquisition to return laser beam, into the FPGA of data handling system, the FPGA is connected in computer output digit signals by USB；The present invention can detect to the other target of molecular level, have the advantages that high resolution, good directionality, strong antijamming capability.
Description
Technical field
The present invention relates to laser radar technique field, more particularly to a kind of Atmospheric Survey laser radar.
Background technology
Most laser radars are all operated in atmospheric environment, so grinding transmission characteristic of the laser in atmospheric environment that make internal disorder or usurp
Have great significance.When laser transmits in an atmosphere, will occur with the molecule in air, aerosol and other particulates mutual
Effect, specifically, can be divided into following several：（1）The some gas molecules of atmosphere cause sharp to the selective absorption of laser
Light intensity decays and transmission direction change.（2）The scattering to laser such as molecule and aerosol, causes laser intensity to be decayed in air
Change with transmission direction.（3）The drastically change of atmospheric physics property causes atmospheric scinillation, causes the modulation and change of laser illumination
Change.（4）The change in physical of itself such as atmospheric molecule and aerosol causes the change of laser.（5）Atmospheric circulation rolls over optics
Penetrate rate and random change occurs, cause wavefront distortion, change good fortune and penetrate and the intensity of laser and coherence.Atmospheric environment detection is laser
The peculiar application of radar, because optical maser wavelength wants much shorter than microwave radar, with the gas molecule in air, dust, cloud and mist, gas
Colloidal sol etc. can produce interaction, and the transmission to laser impacts.In the laser radar of other functions, air is to laser
The influence of transmission is considered as unfavorable factor, and in atmospheric environment laser radar, this is exactly the effective means detected.
Laser is propagated in an atmosphere to be scattered with the particle in air, when the size of optical maser wavelength and scattering particles connects
When near, the scattering of generation is known as Mie scattering.In the case that optical maser wavelength is more much bigger than scattering particles, what is occurred is scattering into
For Rayleigh scattering.For in an atmosphere, the mainly gas molecule of Rayleigh scattering is produced to laser, due to air more than myriametre
In contained dust, cloud and mist and aerosol component can seldom ignore substantially, and the main function of laser and air is exactly Rayleigh scattering,
So Rayleigh lidar is mainly used to detect the density of atmosphere among more than myriametre, fluctuation and temperature.
Existing atmospheric laser radar optical maser wavelength length, directionality is poor, and sensitivity is inadequate.
The content of the invention
The problem of for shortcomings and deficiencies in the prior art, the present invention propose a kind of Atmospheric Survey laser radar, can be with
The other target of molecular level is detected, there is high resolution, good directionality, strong antijamming capability.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of Atmospheric Survey laser radar, including emission system, reception system and data handling system, the emission system is by arteries and veins
Semiconductor laser and photodiode composition are rushed, impulse semiconductor laser launches laser beam, and laser beam is mutual with object
Return laser beam is produced after effect, reception system is supplied to by photodiode, the reception system uses PMT modules, PMT modules
It is described in the FPGA of output digit signals to data handling system after carrying out opto-electronic conversion and data acquisition to return laser beam
FPGA is connected in computer by USB.
Further, the signal wavelength of the impulse semiconductor laser transmitting is 905nm, and pulse energy is 1.2-2.2 μ
J, repetition rate 5KHz.
Further, the PMT modules carry wave-shaping circuit, the digital pulse signal of exportable Transistor-Transistor Logic level, its highest meter
Digit rate is 50MHz.
Further, the FPGA is worked using two counter parallels.
Further, during counter works in described two counters, the data of another counter are write
Internal RAM, and the digital independent of next address in RAM is come out, it is loaded into the counter, realizes the repeatedly tired of data
Add.
Further, described two counter sampling minimum intervals are 100ns.
Further, the computer realizes the access to USB device by NI-VISA.
The present invention has the advantages that：Laser wave length of the present invention, good directionality, so when being detected to target
With very high sensitivity, angular resolution and distance resolution are very strong；Laser wave length, phase interaction can be produced with gas molecule
With using absorption of the different molecular to specific wavelength laser, scattering and fluorescent characteristic, being visited to the other target of molecular level
Survey；Laser not by electronic interferences, may pass through plasma sheath in itself, can be detected with extraterrestrial target；Body is smaller, weight
Gently, solid state and integrated height.
Brief description of the drawings
Fig. 1 is present system structural representation；
Fig. 2 is data handling system structural representation of the present invention.
Embodiment
With reference to specific embodiment, the present invention is expanded on further.It should be understood that these embodiments are merely to illustrate the present invention
Rather than limitation the scope of the present invention.In addition, it is to be understood that after the content of the invention lectured has been read, people in the art
Member can make various changes or modifications to the present invention, and these equivalent form of values equally fall within the application appended claims and limited
Scope.
As illustrated, a kind of Atmospheric Survey laser radar, including emission system, reception system and data handling system, institute
State emission system to be made up of impulse semiconductor laser and photodiode, impulse semiconductor laser transmitting laser beam, laser
Beam is supplied to reception system with producing return laser beam after object interaction, by photodiode, and the reception system uses
PMT modules, after PMT modules carry out opto-electronic conversion and data acquisition to return laser beam, output digit signals to data handling system
FPGA in, the FPGA is connected in computer by USB.
Specifically, impulse semiconductor laser is by launching laser beam, laser beam propagate with target occur scattering, reflection,
Return laser beam, return laser beam are produced after the interaction such as absorption（That is trigger signal）It is supplied to reception system to enter by photodiode
Row opto-electronic conversion and data acquisition, the data of acquisition are analyzed and processed by data handling system.Return laser beam is the equal of to swash
Result of the laser beam of optical radar transmitting after target " modulation ", " solution is carried out by way of mathematical computations to return laser beam
Adjust "（Inversion Calculation）, it is possible to obtain the information of target.
Its emission system is an impulse semiconductor laser, and launch wavelength 905nm, pulse energy is 1.2-22 μ J,
Repetition rate is 5kHz.Reception system uses a PMT module for being operated in monochromatic light subpattern, and the module carries wave-shaping circuit,
The digital pulse signal of exportable Transistor-Transistor Logic level, its peak count rate are 50MHz.
What it is due to the output of PMT modules is the later data signal of shaped examination, it is possible to it is directly inputted to FPGA, and
Trigger signal only have passed through amplifies across resistance, so also needing to screen it.Data after FPGA is cached, are sent out by USB
Deliver to computer.
2 counter parallel work are employed inside FPGA, it is one of to count to be counted to PMT output signals
When device works, the data of another counter are write into internal RAM, and the digital independent of next address in RAM is come out,
The counter is loaded into, so as to realize the repeatedly cumulative of data.Being preserved speed by data is influenceed, and the switching of two counters is most
Fast speed is 100ns, therefore it is 100ns to sample minimum interval.
Computer software realizes the access to USB device by NI-VISA, realize succinct close friend user interface and
Practical acquisition function.
Claims (7)
- A kind of 1. Atmospheric Survey laser radar, it is characterised in that：Including emission system, reception system and data handling system, institute State emission system to be made up of impulse semiconductor laser and photodiode, impulse semiconductor laser transmitting laser beam, laser Beam is supplied to reception system with producing return laser beam after object interaction, by photodiode, and the reception system uses PMT modules, after PMT modules carry out opto-electronic conversion and data acquisition to return laser beam, output digit signals to data handling system FPGA in, the FPGA is connected in computer by USB.
- A kind of 2. Atmospheric Survey laser radar according to claim 1, it is characterised in that：The impulse semiconductor laser The signal wavelength of transmitting is 905nm, and pulse energy is 1.2-2.2 μ J, repetition rate 5KHz.
- A kind of 3. Atmospheric Survey laser radar according to claim 1, it is characterised in that：The PMT modules carry shaping Circuit, the digital pulse signal of exportable Transistor-Transistor Logic level, its peak count rate are 50MHz.
- A kind of 4. Atmospheric Survey laser radar according to claim 1, it is characterised in that：The FPGA is using two countings Device concurrent working.
- A kind of 5. Atmospheric Survey laser radar according to claim 3, it is characterised in that：One in described two counters During individual counter works, the data of another counter are write into internal RAM, and by the digital independent of next address in RAM Out, it is loaded into the counter, realizes the repeatedly cumulative of data.
- A kind of 6. Atmospheric Survey laser radar according to claim 4, it is characterised in that：Described two counter samplings are most The small time is at intervals of 100ns.
- A kind of 7. Atmospheric Survey laser radar according to claim 4, it is characterised in that：The computer passes through NI- VISA realizes the access to USB device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727429.4A CN107422337A (en) | 2017-08-23 | 2017-08-23 | A kind of Atmospheric Survey laser radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727429.4A CN107422337A (en) | 2017-08-23 | 2017-08-23 | A kind of Atmospheric Survey laser radar |
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| Publication Number | Publication Date |
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| CN107422337A true CN107422337A (en) | 2017-12-01 |
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| CN201710727429.4A Pending CN107422337A (en) | 2017-08-23 | 2017-08-23 | A kind of Atmospheric Survey laser radar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112394339A (en) * | 2020-11-16 | 2021-02-23 | 江苏亮点光电研究有限公司 | Control circuit applied to cloud detection radar |
| CN112611921A (en) * | 2020-12-09 | 2021-04-06 | 上海无线电设备研究所 | Atmospheric sound field simulation device and electromagnetic scattering characteristic test method thereof |
| CN117111021A (en) * | 2023-07-17 | 2023-11-24 | 中国科学院合肥物质科学研究院 | System and method for measuring atmospheric coherence length profile based on FPGA |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987520A (en) * | 2006-12-20 | 2007-06-27 | 西安理工大学 | Raman scattering laser radar system for meterological and atmospheric environment observation |
| CN101866007A (en) * | 2010-06-25 | 2010-10-20 | 北京理工大学 | Signal acquisition processing system for atmosphere multiparameter laser radar detection |
| CN102288972A (en) * | 2011-05-10 | 2011-12-21 | 中国海洋大学 | Three-wavelength real-time scaling laser radar device |
| CN204631247U (en) * | 2015-04-28 | 2015-09-09 | 南京信息工程大学 | A kind of high spectral resolution lidar system |
-
2017
- 2017-08-23 CN CN201710727429.4A patent/CN107422337A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1987520A (en) * | 2006-12-20 | 2007-06-27 | 西安理工大学 | Raman scattering laser radar system for meterological and atmospheric environment observation |
| CN101866007A (en) * | 2010-06-25 | 2010-10-20 | 北京理工大学 | Signal acquisition processing system for atmosphere multiparameter laser radar detection |
| CN102288972A (en) * | 2011-05-10 | 2011-12-21 | 中国海洋大学 | Three-wavelength real-time scaling laser radar device |
| CN204631247U (en) * | 2015-04-28 | 2015-09-09 | 南京信息工程大学 | A kind of high spectral resolution lidar system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112394339A (en) * | 2020-11-16 | 2021-02-23 | 江苏亮点光电研究有限公司 | Control circuit applied to cloud detection radar |
| CN112611921A (en) * | 2020-12-09 | 2021-04-06 | 上海无线电设备研究所 | Atmospheric sound field simulation device and electromagnetic scattering characteristic test method thereof |
| CN117111021A (en) * | 2023-07-17 | 2023-11-24 | 中国科学院合肥物质科学研究院 | System and method for measuring atmospheric coherence length profile based on FPGA |
| CN117111021B (en) * | 2023-07-17 | 2024-04-30 | 中国科学院合肥物质科学研究院 | System and method for measuring atmospheric coherence length profile based on FPGA |
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