CN207882443U - A kind of EO-1 hyperion Airborne Lidar examining system - Google Patents
A kind of EO-1 hyperion Airborne Lidar examining system Download PDFInfo
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- CN207882443U CN207882443U CN201820334502.1U CN201820334502U CN207882443U CN 207882443 U CN207882443 U CN 207882443U CN 201820334502 U CN201820334502 U CN 201820334502U CN 207882443 U CN207882443 U CN 207882443U
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Abstract
The utility model discloses a kind of EO-1 hyperion Airborne Lidar examining system, which launches laser successively through beam expanding lens, FP etalons, the first beam splitter, first by laserVertically into air after wave plate；After telescope receives atmospheric backscatter signal, then successively through 45 ° of total reflective mirrors, aperture, collimating mirror, optical filter, secondWave plate reaches pellicle mirror, signal is divided into two-way by pellicle mirror, it is that semi-transparent specular signal directly enters the first photodetector through the first plus lens all the way, another way is that pellicle mirror enters the second photodetector after FP etalons, the second beam splitter and the second plus lens successively through signal；First photodetector and the second photodetector are connected by signal acquisition module with master control system respectively.The utility model carries out the separation of atmospheric molecule Rayleigh scattering signal and aerosol Mie scattering signal using FP etalons, improves the accuracy of aerosol optical parameter detection.
Description
Technical field
The utility model belongs to atmospheric science field, and in particular to a kind of EO-1 hyperion Airborne Lidar examining system.
Background technology
In broad terms, it is 10 that in general atmospheric aerosol, which refers to radius,-3~102Suspension the consolidating in an atmosphere of um
State and liquid particulate, such as plant, soil dust, smog, wave and fluoride.Atmospheric aerosol to optical transport, environment and
Weather etc. has a serious impact.For example, it can influence surface temperature by absorbing and scattering sunlight；Secondly, aerosol
Play the part of the role of the nuclei of condensation in dizzy forming process, can by influence service life of the optical characteristics of cloud, cloud amount and cloud into
And influence precipitation；Again, the aerosol that coal burning and industrial gas emission generate can cause acid rain and lead to environmental degradation.
Therefore, there is important science and realistic meaning to the accurate detection of aerosol.
Laser radar is by analyzing phase interaction between distant object and laser beam as a kind of important remote sensing
Echo-signal obtains a kind of optical device of destination properties.Due to the advantages that its detection range is remote, and detection accuracy is high, swash
Optical radar has become a kind of indispensable equipment in detection aerosol art.But traditional laser radar is in detection aerosol
Due to being interfered by atmospheric molecule Rayleigh scattering signal when optical parameter, it is necessary to which by radar coefficient, this hypothesis could inverting
Aerosol optical parameter, therefore, detection accuracy are limited.Compared to traditional laser radar, EO-1 hyperion laser radar is in gas
It has a clear superiority on colloidal sol detection accuracy, for example iodine molecule EO-1 hyperion laser radar has aerosol very high detection essence
Degree, but this EO-1 hyperion laser radar, there are some drawbacks, this EO-1 hyperion laser radar uses single longitudinal mode laser
It is system complex, expensive with high-resolution spectra device.Vibrating Raman lidar can also accurate inverting aerosol
Optical parameter, but it is influenced by sun bias light, and daytime is difficult work.
Invention content
Purpose of the utility model is to solve defect existing in the prior art, provide it is a kind of it is at low cost, structure is simple
Single EO-1 hyperion laser radar.
In order to achieve the above object, the utility model is by using traditional non-seed injection Nd：YAG laser additional one
A Fabry-Perot interferometer（FP etalons）Realize detection of the EO-1 hyperion laser radar to aerosol.
The utility model provides a kind of EO-1 hyperion Airborne Lidar examining system, including laser, beam expanding lens, FP standards
Tool, the first beam splitter, the first beam splitter, firstWave plate, telescope, 45 ° of total reflective mirrors, aperture, collimating mirror, optical filter, second
Wave plate, pellicle mirror, FP etalons, the second beam splitter, the first plus lens, the second plus lens, the first photodetector, second
Photodetector, signal acquisition module, master control system；The laser launches laser successively through beam expanding lens, FP etalons,
One beam splitter, firstVertically into air after wave plate；After the telescope receives atmospheric backscatter signal, then pass through successively
45 ° of total reflective mirrors, aperture, collimating mirror, optical filter, secondWave plate reaches pellicle mirror, signal is divided into two-way by pellicle mirror, all the way
Be semi-transparent specular signal directly through the first plus lens enter the first photodetector, another way be pellicle mirror through signal according to
It is secondary to enter the second photodetector after the FP etalons, the second beam splitter and the second plus lens；First photoelectricity is visited
It surveys device and the second photodetector is connected by signal acquisition module with master control system respectively.
Preferably, laser uses YAG laser.
Preferably, telescope uses the Cassegrain telescope of 200mm, focal length 2032mm.
Preferably, photodetector uses the photomultiplier of H10682-110 models.
Preferably, signal acquisition module uses the photon counting card of P7882 models.
Preferably, the Free Spectral Range of FP etalons is 2GHz.
The utility model has the following advantages compared with prior art：
The utility model carries out point of atmospheric molecule Rayleigh scattering signal and aerosol Mie scattering signal using FP etalons
From the accuracy of raising aerosol optical parameter detection；
The utility model uses traditional non-seed injection Nd：The additional FP etalon of YAG laser realizes EO-1 hyperion
Detection of the laser radar to aerosol, this EO-1 hyperion laser radar have system knot compared to iodine molecule EO-1 hyperion laser radar
Simple, the cheap advantage of structure.
Description of the drawings
Fig. 1 is the structural schematic diagram of the utility model EO-1 hyperion Airborne Lidar examining system；
Fig. 2 is FP etalon transmission spectrograms；
Fig. 3 is that wideband laser passes through the transmission spectrum figure after FP etalons；
The transmitted light spectrogram of FP etalons when Fig. 4 is different incidence angles；
Fig. 5 is the fundamental diagram of FP etalons.
Specific implementation mode
The utility model is described in detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the utility model is used for the EO-1 hyperion Airborne Lidar examining system of aerosol optical parameter detection, it is main
To include laser radar emission system, laser radar reception system and master control system；Wherein, laser radar emission system includes
Laser 1, beam expanding lens 2, FP etalons 4, the first beam splitter 13,Wave plate 6；Laser radar receive system include telescope 7,
45 ° of total reflective mirrors 8, aperture 9, collimating mirror 10, optical filter 11,Wave plate 12, pellicle mirror 5, FP etalons 4, the second beam splitter 3,
One plus lens 14, the second plus lens 16, the first photodetector 15, the second photodetector 17, signal acquisition module, master
Control system（It is not drawn into）；First photodetector 15, the second photodetector 17 are connected with signal acquisition module, signal acquisition mould
Block is connected with master control system；Transmitting and receive system share a FP etalon 4, it is ensured that when reception through spectrum and send out it is sharp
The spectrum of light is completely the same.The operation principle of entire EO-1 hyperion laser radar is that the laser signal that laser 1 emits passes through successively
Beam expanding lens 2（Expanded light beam reduces the angle of divergence of laser simultaneously）, FP etalons 4（The frequency for modulating incident laser, makes to launch
Laser be several independent narrowband wide spectrums in frequency）, the first beam splitter 13（The laser of separation of level and vertical polarization）、Wave plate 6（By 45 ° of the phase change of incident laser）Afterwards vertically into air, 7 vertical reception atmospheric molecule of telescope and gas are molten
The backscatter signal of glue, backscatter signal is again successively into 45 ° of total reflective mirrors 8 excessively（Vertical laser is reflexed into horizontal direction）、
Aperture 9（The signal-to-noise ratio for limiting the size of field angle and reducing noise, improving system）, collimating mirror 10（The laser of convergence is become
At the light of parallel transmission）, optical filter 11（532nm wavelength is filtered out to the signal of outer other wave bands, the signal-to-noise ratio of raising system）、
Wave plate 12 reaches pellicle mirror 5, and signal back is divided into two-way by pellicle mirror 5, wherein being converged all the way by first by pellicle mirror reflection
Poly- lens 14 are directly entered the first photodetector 15, as energy measuring channel（The channels M）；The signal all the way that pellicle mirror penetrates
Pass through FP etalons 4, the second beam splitter 3 and the second plus lens 16 successively and enter the second photodetector 17, this road signal is used
To detect the Rayleigh scattering echo-signal of atmospheric molecule（The channels F）；Wherein FP etalons filter out aerosol Mie scattering signal
And only by the Rayleigh scattering signal of atmospheric molecule, photodetector converts photon signal to electric signal and is transmitted to signal and adopts
Collect module, signal acquisition module is by collected electric signal transmission to master control system（Computer can be used）.
FP etalons are an extremely important elements in the utility model, are now done its use introduced below：
In the present invention, the parameter that FP etalons are related to mainly has Free Spectral Range and fineness.It is fixed
The fineness of adopted striped is the ratio between fringe spacing and striped half-breadth, is indicated with S, and R indicates the reflectivity of etalon, then：
Wherein fringe spacing is the π of δ=2,For phase difference half breadth, it is expressed as。
It defines Free Spectral Range and indicates the spectral region not overlapped between different level spectral lines.Then Fabry-Perot
The Free Spectral Range of interferometer（FSR）Formula can be used（2）It solves：
If wavelength is respectively λ1And λ2（λ1<λ2）Two kinds of spectral components in an identical manner through etalon formed one group it is sharp
Thin concentric ring-shaped interference fringe.For same order of interference, λ1Halo diameter compared with λ2It is more bigger.When meeting j λ1=（j-
1）λ2When, λ1J-th stage bright ring and λ2Jth -1 grade of bright ring overlapping, then：
Wherein i is incidence angle, and n is the refractive index of Fabry-Perot interferometer, and h is the thickness of Fabry-Perot interferometer
Degree.
Under normal circumstances, angle i very littles, it is believed thatcosi≈1.Work as λ1And λ2When close, λ can use2 λ1≈λ2.So mark
Quasi- tool Free Spectral Range be：
In atmospheric radiation theory, the spectral width of atmospheric aerosol is since the Brownian movement of atmospheric aerosol particle causes
Dopplerbroadening, and atmospheric molecule scattering spectrum be due to dopplerbroadening caused by the warm-up movement of atmospheric molecule, compare and
Speech, atmospheric molecule Rayleigh Scattering Spectra are more many than atmospheric aerosol Mie scattering spectral width；When temperature is 280K, 532nm's is auspicious
Sharp scattering spectrum width is about 1.25GHz, and the spectral width of aerosol is about 70MHz.In order to by entire Rayleigh Scattering Spectra
The Free Spectral Range that FP tools are selected in FP etalon transmission spectrum, in the utility model is 2GHz.
The spectral transmission equation of FP etalons can use formula（4）Carry out approximate expression：
Wherein μ is the refractive index of FP etalons, d0It is the spacing between two plate of etalon, v0It is incident light frequency, θ0Be into
Firing angle, A are the complete attenuations of etalon, and R is reflectivity, and c is the light velocity.
According to formula（4）The transmitted light spectrogram that FP etalons can be drawn is as shown in Figure 2.The wherein numerical value of attenuation constant A
It is set as 0, the setting value of reflectivity R is 0.80, and the setting value of refractive index μ is 1.5, the spacing d between two plate of etalon0
Setting value be 0.025, incidence angle is set as 0.001, and constant n takes 200.
In the present invention, the operation principle of FP etalons is as described below：
In Fig. 3 (a), wide range signal is the signal that laser generates, and narrow spectrum signal is the transmission spectral signal of FP etalons,
After the wide range signal that laser generates is by FP etalons, pectination is modulated into frequency, as shown in Fig. 3 (b)；Then
ThroughWave plate enters air.Due to laser Vertical Launch, Doppler effect very little in vertical direction, the influence to spectrum
It can ignore, then the light that aerosol scattering is returned is optical signal that frequency is not widened, and molecular scattering is returned signal its light
Spectrum can widen, and spectral width can reach 106 times of aerosol spectrum width.The transmitted spectrum of FP etalons is distributed and incidence
There is direct relation at angle, and when incidence angle changes, translation and its can occur for the position of its transmitted spectrum can also occur through luminous intensity
Change, dotted line spectrum as shown in Figure 4 be incidence angle be 0.005 ° when FP etalons transmitted light spectrogram, solid line spectrum is incidence angle
The transmitted light spectrogram of FP etalons when being 0.001 °.
Since atmospheric molecule Rayleigh scattering signal spectral width is about 2GHz, and aerosol Mie scattering signal spectrum is equivalent
In emission spectrum width, as shown in figure 5, when the incidence angle through FP etalon optical signals changes（By adjusting 45 ° of speculum realities
It is existing）When its transmitted spectrum position being caused to change, atmospheric molecule Rayleigh scattering signal is most of or can pass through FP etalons
Continuation is transmitted backward, and aerosol Mie scattering signal can then be suppressed and can not penetrate FP etalons.In Fig. 5, solid line spectrum be into
Firing angle be 0.001 ° when FP etalons transmitted light spectrogram, dotted line spectrum be incidence angle be 0.005 ° when FP etalons transmitted light
The spectrum of spectrogram, band " * " number mark is that atmospheric molecule and aerosol rear orientation light are composed（Part is wherein irised out to indicate when through FP
The incidence angle of etalon optical signal remains to the atmospheric molecule Rayleigh scattering signal through FP etalons after changing）.It is new in this practicality
Atmospheric molecule Rayleigh scattering signal and aerosol Mie scattering signal are separated using this property of FP etalons in type, then come
Calculate the optical parameters such as aerosol backscattering coefficient.
As a kind of preferred embodiment of the utility model, the laser uses YAG laser.
As a kind of preferred embodiment of the utility model, the telescope uses the Cassegrain telescope of 200mm, burnt
Away from for 2032mm.
As a kind of preferred embodiment of the utility model, the photodetector is the photomultiplier transit of H10682-110 models
Pipe.
As a kind of preferred embodiment of the utility model, the signal acquisition module uses the photon counting of P7882 models
Card.
The utility model EO-1 hyperion Airborne Lidar examining system specific work process is as follows：
Step 1：YAG solid state lasers 1 generate laser, and laser enters beam expanding lens 2；
Step 2：The laser for expanding and reducing the angle of divergence through beam expanding lens 2 enters FP etalons 4, is adjusted using FP etalons 4
The frequency of incident laser processed, it is several independent narrowband wide spectrums in frequency to make the laser launched；
Step 3：After incident laser is by the first beam splitter 13, then pass throughThe production of the phase angle of wave plate 6 while incident laser
Raw 45 ° of variations, then Vertical Launch is into air；
Step 4：The optical signal that the back scattering of the reception atmospheric molecule of telescope 7 and aerosol is returned, through 45 ° of total reflective mirrors 8
The optical signal that vertical direction is transmitted is changed to horizontal transport direction, then the aperture 9 by being placed on telescope focal plane；
Step 5：Become directional light by the collimated mirror of the optical signal of aperture 9 10, then filters out and remove through optical filter 11
The optical signal of its all band except 532nm wavelength；
Step 6：Optical signal passes through secondPhase angle changes 45 ° to wave plate 12 simultaneously, then reaches pellicle mirror 5；
Step 7：The optical signal of horizontal transport is divided into two-way by pellicle mirror 5, is reflected all the way straight through the first plus lens 14
It taps into the first photodetector 15, the photon signal received is converted to by electric signal by photomultiplier and is delivered to letter
Number acquisition module, as energy measuring channel（The channels M）；Another way reaches FP etalons 4 through pellicle mirror 5, this road signal is used
To detect the Rayleigh scattering echo-signal of atmospheric molecule（The channels F）；
Step 8：Be incident to the incidence angle of 4 incident light of FP etalons by changing, by atmospheric molecule Rayleigh scattering signal and
Aerosol Mie scattering signal separates；
Step 9：Rayleigh scattering signal enters the second photodetector 17 by the second beam splitter 16, passes through photomultiplier transit
The photon signal received is converted to electric signal and is delivered to signal acquisition module by pipe；
Step 10：Computer（That is master control system）Acquired data are received, data analysis is finally carried out.
Wherein the data analysis process of step 10 uses the method for inversion, detailed process as follows：
The reception signal in the channels M and the channels F can use formula respectively（7）、（8）It indicates：
Wherein,、The number of photons that respectively M and F channel receptions arrive；、For the splitting ratio of two-way；、It is two
The system constants on road include the quantum efficiency of laser energy, optical efficiency and detector；Represent the distance of laser radar because
Son；For distance resolution；For distance resolution；With（）It is that aerosol and the backward of atmospheric molecule dissipate respectively
It penetrates（Delustring）Coefficient；WithThe transmitance that respectively aerosol and atmospheric molecule scattered signal pass through FP etalons.
When changing the incidence angle of signal, the transmitted spectrum of FP etalons changes, due to aerosol Mie scattering signal
Spectral signal is very narrow, thus aerosol Mie scattering signal be suppressed and can not by FP etalons, so, logical by M
The ratio in road and the channels F can obtain Atmospheric back-scattering ratio Rb：
Wherein, K is calibration constants.Due to laser radar vertical measurement, SEQUENCING VERTICAL wind speed very little（Generally less than 1ms-1）,
Doppler frequency shift very little caused by it, soIt can be obtained by theoretical calculation, toIt can obtain.Atmospheric molecule it is backward
Scattering coefficientIt can be acquired by ARDC model atmosphere ARDC and neighbouring Sounding Data, so the backscattering coefficient of aerosol
Formula can be used（10）It acquires：
。
Claims (3)
1. a kind of EO-1 hyperion Airborne Lidar examining system, it is characterised in that：Including laser, beam expanding lens, FP etalons, first point
Shu Jing, the first beam splitter, firstWave plate, telescope, 45 ° of total reflective mirrors, aperture, collimating mirror, optical filter, secondIt is wave plate, semi-transparent
Mirror, FP etalons, the second beam splitter, the first plus lens, the second plus lens, the first photodetector, the second photodetection
Device, signal acquisition module, master control system；The laser launches laser successively through beam expanding lens, FP etalons, the first beam splitting
Mirror, firstVertically into air after wave plate；After the telescope receives atmospheric backscatter signal, then it is all-trans successively through 45 °
Mirror, aperture, collimating mirror, optical filter, secondWave plate reaches pellicle mirror, and signal is divided into two-way by pellicle mirror, is semi-transparent all the way
Specular signal directly enters the first photodetector through the first plus lens, and another way is for pellicle mirror through signal successively through institute
Enter the second photodetector after stating FP etalons, the second beam splitter and the second plus lens；First photodetector and
Second photodetector is connected by signal acquisition module with master control system respectively.
2. EO-1 hyperion Airborne Lidar examining system according to claim 1, it is characterised in that：The laser uses YAG
Laser；The telescope uses the Cassegrain telescope of 200mm, focal length 2032mm；The photodetector uses
The photomultiplier of H10682-110 models；The signal acquisition module uses the photon counting card of P7882 models.
3. EO-1 hyperion Airborne Lidar examining system according to claim 1, it is characterised in that：The freedom of the FP etalons
Spectral region is 2GHz.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303706A (en) * | 2018-03-12 | 2018-07-20 | 南京信息工程大学 | A kind of aerosol optical parameter detection method and EO-1 hyperion Airborne Lidar examining system |
| CN109639942A (en) * | 2018-12-14 | 2019-04-16 | 中国科学院深圳先进技术研究院 | Underwater imaging system, underwater imaging apparatus and Underwater Imaging method |
| CN110045392A (en) * | 2019-05-23 | 2019-07-23 | 南京信息工程大学 | It is a kind of for scanning the laser radar system of atmospheric aerosol |
| CN110297257A (en) * | 2019-07-30 | 2019-10-01 | 南京信息工程大学 | A kind of method and system based on dopplerbroadening measurement atmospheric temperature |
| CN113075152A (en) * | 2021-03-26 | 2021-07-06 | 云南电网有限责任公司电力科学研究院 | Infrared light enhancement system for detecting content of dissolved gas in transformer oil |
| CN114994711A (en) * | 2022-08-05 | 2022-09-02 | 南京信息工程大学 | Laser radar based on Fizeau interferometer |
| WO2023159395A1 (en) * | 2022-02-23 | 2023-08-31 | 北京佰为深科技发展有限公司 | Demodulation system for optical fiber fabry‑perot sensor |
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2018
- 2018-03-12 CN CN201820334502.1U patent/CN207882443U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108303706A (en) * | 2018-03-12 | 2018-07-20 | 南京信息工程大学 | A kind of aerosol optical parameter detection method and EO-1 hyperion Airborne Lidar examining system |
| CN108303706B (en) * | 2018-03-12 | 2023-10-31 | 南京信息工程大学 | Aerosol optical parameter detection method and hyperspectral laser radar detection system |
| CN109639942A (en) * | 2018-12-14 | 2019-04-16 | 中国科学院深圳先进技术研究院 | Underwater imaging system, underwater imaging apparatus and Underwater Imaging method |
| CN109639942B (en) * | 2018-12-14 | 2021-03-02 | 中国科学院深圳先进技术研究院 | Underwater imaging system, underwater imaging device and underwater imaging method |
| CN110045392A (en) * | 2019-05-23 | 2019-07-23 | 南京信息工程大学 | It is a kind of for scanning the laser radar system of atmospheric aerosol |
| CN110297257A (en) * | 2019-07-30 | 2019-10-01 | 南京信息工程大学 | A kind of method and system based on dopplerbroadening measurement atmospheric temperature |
| CN113075152A (en) * | 2021-03-26 | 2021-07-06 | 云南电网有限责任公司电力科学研究院 | Infrared light enhancement system for detecting content of dissolved gas in transformer oil |
| WO2023159395A1 (en) * | 2022-02-23 | 2023-08-31 | 北京佰为深科技发展有限公司 | Demodulation system for optical fiber fabry‑perot sensor |
| CN114994711A (en) * | 2022-08-05 | 2022-09-02 | 南京信息工程大学 | Laser radar based on Fizeau interferometer |
| CN114994711B (en) * | 2022-08-05 | 2022-10-04 | 南京信息工程大学 | Laser radar based on Fizeau interferometer |
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