CN208569042U - A kind of low blind area dual wavelength triple channel Airborne Lidar examining system - Google Patents
A kind of low blind area dual wavelength triple channel Airborne Lidar examining system Download PDFInfo
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- CN208569042U CN208569042U CN201821126626.7U CN201821126626U CN208569042U CN 208569042 U CN208569042 U CN 208569042U CN 201821126626 U CN201821126626 U CN 201821126626U CN 208569042 U CN208569042 U CN 208569042U
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Abstract
The utility model discloses a kind of low blind area dual wavelength triple channel Airborne Lidar examining system, the Airborne Lidar examining system includes laser, emission system and receives system, and the wavelength of the detection light of the outgoing of the laser includes first wave length and second wave length；The measurement light for projecting the reception system is separated the first light beam and the second light beam by light splitting part；The wavelength of first light beam includes first wave length, does not include second wave length；The wavelength of second light beam includes second wave length, does not include first wave length；Second light beam is divided into third light beam with the first polarization direction to first polarization beam splitting component and with the 4th light beam of the second polarization direction, first polarization direction and the second polarization direction are mutually perpendicular to；Detector receives first light beam, third light beam and the 4th light beam respectively.The utility model has the advantages that Linear polarization is high, measurement blind area is low etc..
Description
Technical field
The utility model belongs to environmental monitoring field, relates in particular to a kind of low blind area dual wavelength triple channel laser radar
Detection system.
Background technique
Laser radar is a kind of active remote sensing technology by means of laser, main by analyzing laser beam in propagation in atmosphere mistake
The echo-signal of Cheng Zhongyu atmospheric interaction obtains the information of atmospheric environment.Laser has that monochromaticjty is good, high directivity, bright
The characteristics of degree height, pulse width, space division when laser radar being allowed to carry out high down to 30 kilometer range atmospheric environments to 0.2 kilometer
It is wide to become research atmospheric boundary layer, aerosol (floating dust), cloud structure, Atmospheric components, wind field, temperature for the real-time observation for distinguishing ability
The New Generation High-tech means of line atmospheric characteristic.
Laser radar system can be divided into coaxial and Non-coaxial system from structure, and the main distinction of the two, which is to emit, to swash
Whether the optical axis of light beam and the optical axis for receiving system are coaxial.Off-axis system is since laser beam axis is parallel with telescope optic axis but does not weigh
Conjunction causes laser beam that can progress into the visual field of telescope in communication process, causes the detection there are 200m-500m blind
Area.Coaxial system leads to the detection there are 100m-200m since the secondary mirror in Cassegrain telescope can block a part of signal
Blind area.When a branch of linearly polarized light is irradiated on particle, the scattered light intensity and polarization characteristic that scattering particles generates will become with angle of scattering
Change, and the size of same lambda1-wavelength, scattering particles, shape and light refractive index are related.When scattering particles presentation is spherical and each
When to the same sex, according to the light scattering theory of spheroidal particle, rear orientation light is also linearly polarized light, the direction of vibration of electric vector and
Incident light is identical.However, in the case where scattering particles is aspherical, it is generated backward even incident light linearly polarized light
Scattering light is also partial poolarized light, that is, produces and move back polarization phenomena.
BJ University of Aeronautics & Astronautics Sun Dongsong proposed in " off-axis Mie scattering laser radar system and its signal calibration " from
Axle system can effectively improve the detectivity to high-altitude echo, and can avoid the stronger scatter echo in low latitude to compress
The dynamic range of echo.
The off-axis system that Macao University of Science and Technology Zheng Yuchen mentions use in CN200920174505.4 can effectively subtract
Damage caused by being irradiated for a long time when small near field echoes signal is stronger to highly-sensitive detector, while also reducing near field letter
Number saturation risk.
Wuhan University Gong Wei proposes the detection due to coaxial system for distant signal in CN201210353997.X
Energy power limit, by the way of height space division Layer Detection, optical system includes Laser emission subsystem, the first optics receiving channel
With the second optics receiving channel, the optical axis and the first optical receiving system of the laser pulse beam of Laser emission subsystem transmitting are received
The optical axis coincidence in channel, the optical axis of the laser pulse beam of Laser emission subsystem transmitting and the optical axis of the second optics receiving channel are flat
Row is without being overlapped.
Utility model content
In order to overcome defect existing in the prior art, the utility model provides that a kind of Linear polarization is high, measurement is blind
The low low blind area dual wavelength triple channel Airborne Lidar examining system in area.
The purpose of this utility model has the technical scheme that
A kind of low blind area dual wavelength triple channel Airborne Lidar examining system, the laser radar system include laser, hair
System and reception system are penetrated, the wavelength of the detection light of the outgoing of the laser includes first wave length λ1With second wave length λ2, λ1≠
λ2；The dual wavelength triple channel Airborne Lidar examining system further comprises:
The measurement light for projecting the reception system is separated the first light beam and the second light by light splitting part, the light splitting part
Beam；The wavelength of first light beam includes first wave length λ1, do not include second wave length λ2；The wavelength of second light beam includes the
Two wavelength Xs2, do not include first wave length λ1；
Second light beam is divided into the first polarization side by the first polarization beam splitting component, the first polarization beam splitting component
To third light beam and with the 4th light beam of the second polarization direction, first polarization direction and the second polarization direction are mutual
Vertically；
Detector, the detector receive first light beam, third light beam and the 4th light beam respectively.
According to above-mentioned low blind area dual wavelength triple channel Airborne Lidar examining system, optionally, the emission system includes:
The detection light is divided into third polarization direction by the second polarization beam splitting component, the second polarization beam splitting component
The 5th light beam and the 6th light beam with the 4th polarization direction, the third polarization direction and the 4th polarization direction mutually hang down
Directly；
Light cut-off parts, the 5th light beam end in the smooth cut-off parts；
First reflecting mirror, by the direction of travel of the 6th light beam after first reflecting mirror reflection and the reception system
Optical main axis is parallel.
According to above-mentioned low blind area dual wavelength triple channel Airborne Lidar examining system, it is preferable that the smooth cut-off parts are
Linear polarizer or light absorption part, the polarization direction of the linear polarizer are identical as the 4th polarization direction.
According to above-mentioned low blind area dual wavelength triple channel Airborne Lidar examining system, optionally, the reception system includes:
Second reflecting mirror, the concave reflecting surface of second reflecting mirror are reflected into third reflecting mirror for light is measured；It is described recessed
Reflective back of the shape reflecting surface in face of first reflecting mirror；
Third reflecting mirror, the measurement light by third reflecting mirror reflection are defeated across the center of second reflecting mirror
The reception system out.
According to above-mentioned low blind area dual wavelength triple channel Airborne Lidar examining system, it is preferable that the third reflecting mirror tool
There is convex reflecting surface.
According to above-mentioned low blind area dual wavelength triple channel Airborne Lidar examining system, optionally, the dual wavelength triple channel
Airborne Lidar examining system further comprises:
Diaphragm, the diaphragm are arranged at the output of measurement light of the reception system.
According to above-mentioned low blind area dual wavelength triple channel Airborne Lidar examining system, optionally, the dual wavelength triple channel
Airborne Lidar examining system further comprises:
Light collimating components, the smooth collimating components are arranged in the measurement light optical path between the diaphragm and light splitting part.
According to above-mentioned low blind area dual wavelength triple channel Airborne Lidar examining system, optionally, the dual wavelength triple channel
Airborne Lidar examining system further comprises:
Optical filter, first light beam, third light beam and the 4th light beam pass through after the optical filter respectively by detector
It receives.
According to above-mentioned low blind area dual wavelength triple channel Airborne Lidar examining system, optionally, the emission system is into one
Step includes:
Light expands component, and the detection light enters the second polarization beam splitting component after the light expands component.
According to above-mentioned low blind area dual wavelength triple channel Airborne Lidar examining system, it is preferable that first wave length λ1=
355nm, second wave length λ2=532nm.
Compared with prior art, the utility model has the following beneficial effects:
The low blind area dual wavelength triple channel detection for realizing Airborne Lidar examining system, can not only improve shoot laser beam
Linear polarization, and can be realized the low blind area measurement of coaxial system.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the utility model
Other features, objects and advantages will become more apparent upon:
Fig. 1 is the structural schematic diagram according to dual wavelength triple channel Airborne Lidar examining system provided by the utility model.
The same or similar appended drawing reference represents the same or similar component in attached drawing.
Specific embodiment
Following disclosure provides many different embodiments or example is used to realize the different structure of the utility model.For
The disclosure of simplified the utility model, is hereinafter described the component of specific examples and setting.In addition, the utility model can
With repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself does not refer to
Show the relationship between discussed various embodiments and/or setting.It should be noted that in the accompanying drawings illustrated component not necessarily press than
Example is drawn.The description to known assemblies and treatment technology and process is omitted to avoid this reality is unnecessarily limiting in the utility model
With novel.
Embodiment:
Fig. 1 schematically illustrates the low blind area dual wavelength triple channel Airborne Lidar examining system of the utility model embodiment
Structure diagram, as shown in Figure 1, the low blind area dual wavelength triple channel Airborne Lidar examining system includes:
Laser, the laser issue detection light, and the wavelength of the detector light includes first wave length λ1With the second wave
Long λ2；Such as, first wave length λ1=355nm, second wave length λ2=532nm；
Emission system, the emission system include:
Light expands component, and the measurement light enters the second polarization beam splitting component after the light expands component；
Second polarization beam splitting component M1, such as polarization splitting prism, the second polarization beam splitting component divide the detection light
For the 5th light beam with third polarization direction and the 6th light beam with the 4th polarization direction, the third polarization direction and
4th polarization direction is mutually perpendicular to；5th light beam and the 6th light beam are mutually perpendicular to；
Light cut-off parts M2, the 5th light beam end in the smooth cut-off parts, prevent the 5th light beam from injecting atmosphere
In；The smooth cut-off parts are linear polarizer or light absorption part, and the polarization direction of the linear polarizer and the described 4th polarize
Direction is identical；
First reflecting mirror M3, by the direction of travel of the 6th light beam after first reflecting mirror reflection and the reception system
Optical main axis be overlapped；
Reception system, the reception system include:
Second reflecting mirror M4, the concave reflecting surface of second reflecting mirror are reflected into third reflecting mirror for light is measured；It is described
Reflective back of the concave reflecting surface in face of first reflecting mirror；
Third reflecting mirror M5, by the third reflecting mirror reflection measurement light pass through second reflecting mirror center and
The reception system is exported, the third reflecting mirror has convex reflecting surface；
Diaphragm M6, the diaphragm are arranged at the output of measurement light of the reception system；
The measurement light optical path between the diaphragm and light splitting part is arranged in light collimating components M7, the smooth collimating components
On；
The measurement light for projecting the reception system is separated the first light beam and the second light by light splitting part M8, the light splitting part
Beam；The wavelength of first light beam includes first wave length λ1, do not include second wave length λ2；The wavelength of second light beam includes the
Two wavelength Xs2, do not include first wave length λ1；First light beam and the second light beam are mutually perpendicular to；The light splitting part is to first wave length λ1
Full impregnated, to second wave length λ2It is all-trans；
First polarization beam splitting component M9, such as polarization splitting prism, the first polarization beam splitting component is by second light beam
It is divided into the third light beam with the first polarization direction and the 4th light beam with the second polarization direction, first polarization direction
It is mutually perpendicular to the second polarization direction；The third light beam and the 4th light beam are mutually perpendicular to；
Optical filter M10-M12, first light beam, third light beam and the 4th light beam pass through quilt after the optical filter respectively
Detector receives；
Detector, the detector receive first light beam, third light beam and the 4th light beam respectively；That is, the first light
Beam, third light beam and the 4th light beam have respectively constituted first passage, second channel and third channel.
Although being described in detail about example embodiment and its advantage, it should be understood that in the essence for not departing from the utility model
In the case where protection scope refreshing and defined in the appended claims, these embodiments can be carried out with various change, replace and repair
Change.For other examples, those skilled in the art, which should be readily appreciated that, to be kept in scope of protection of the utility model
Meanwhile the order of processing step can change.
Claims (10)
1. a kind of low blind area dual wavelength triple channel Airborne Lidar examining system, the Airborne Lidar examining system include laser,
Emission system and reception system, the wavelength of the detection light of the outgoing of the laser includes first wave length λ1With second wave length λ2, λ1
≠λ2；It is characterized by: the dual wavelength triple channel Airborne Lidar examining system further comprises:
The measurement light for projecting the reception system is separated the first light beam and the second light beam by light splitting part, the light splitting part；Institute
The wavelength for stating the first light beam includes first wave length λ1, do not include second wave length λ2；The wavelength of second light beam includes second wave length
λ2, do not include first wave length λ1；
Second light beam is divided into the first polarization direction by the first polarization beam splitting component, the first polarization beam splitting component
Third light beam and the 4th light beam with the second polarization direction, first polarization direction and the second polarization direction are mutually hung down
Directly；
Detector, the detector receive first light beam, third light beam and the 4th light beam respectively.
2. low blind area dual wavelength triple channel Airborne Lidar examining system according to claim 1, it is characterised in that: the hair
The system of penetrating includes:
The detection light is divided into the with third polarization direction by the second polarization beam splitting component, the second polarization beam splitting component
Five light beams and the 6th light beam with the 4th polarization direction, the third polarization direction and the 4th polarization direction are mutually perpendicular to；
Light cut-off parts, the 5th light beam end in the smooth cut-off parts；
First reflecting mirror, by the optics of the direction of travel of the 6th light beam after first reflecting mirror reflection and the reception system
Main shaft is parallel.
3. low blind area dual wavelength triple channel Airborne Lidar examining system according to claim 2, it is characterised in that: the light
Cut-off parts are linear polarizer or light absorption part, and the polarization direction of the linear polarizer is identical as the 4th polarization direction.
4. low blind area dual wavelength triple channel Airborne Lidar examining system according to claim 2, it is characterised in that: described to connect
Receipts system includes:
Second reflecting mirror, the concave reflecting surface of second reflecting mirror are reflected into third reflecting mirror for light is measured；The spill is anti-
Penetrate face in face of first reflecting mirror reflective back；
Third reflecting mirror, the measurement light by third reflecting mirror reflection pass through the center of second reflecting mirror and export institute
State reception system.
5. low blind area dual wavelength triple channel Airborne Lidar examining system according to claim 4, it is characterised in that: described
Three reflecting mirrors have convex reflecting surface.
6. low blind area dual wavelength triple channel Airborne Lidar examining system according to claim 1, it is characterised in that: described double
Wavelength triple channel Airborne Lidar examining system further comprises:
Diaphragm, the diaphragm are arranged at the output of measurement light of the reception system.
7. low blind area dual wavelength triple channel Airborne Lidar examining system according to claim 6, it is characterised in that: described double
Wavelength triple channel Airborne Lidar examining system further comprises:
Light collimating components, the smooth collimating components are arranged in the measurement light optical path between the diaphragm and light splitting part.
8. low blind area dual wavelength triple channel Airborne Lidar examining system according to claim 1, it is characterised in that: described double
Wavelength triple channel Airborne Lidar examining system further comprises:
Optical filter, first light beam, third light beam and the 4th light beam after the optical filter respectively by being received by a detector.
9. low blind area dual wavelength triple channel Airborne Lidar examining system according to claim 2, it is characterised in that: the hair
The system of penetrating further comprises:
Light expands component, and the detection light enters the second polarization beam splitting component after the light expands component.
10. low blind area dual wavelength triple channel Airborne Lidar examining system according to claim 1, it is characterised in that: first
Wavelength X1=355nm, second wave length λ2=532nm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821126626.7U CN208569042U (en) | 2018-07-17 | 2018-07-17 | A kind of low blind area dual wavelength triple channel Airborne Lidar examining system |
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| CN201821126626.7U CN208569042U (en) | 2018-07-17 | 2018-07-17 | A kind of low blind area dual wavelength triple channel Airborne Lidar examining system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946710A (en) * | 2019-03-29 | 2019-06-28 | 中国科学院上海技术物理研究所 | A kind of more polarized laser imaging devices of dual wavelength |
| CN110568449A (en) * | 2019-10-14 | 2019-12-13 | 自然资源部第二海洋研究所 | Wind-borne rough sea surface laser reflection and transmission matrix calculation method |
| CN110673156A (en) * | 2019-11-01 | 2020-01-10 | 自然资源部第二海洋研究所 | Double-beam stimulated Brillouin scattering airborne marine laser radar system |
| CN111983590A (en) * | 2020-08-21 | 2020-11-24 | 哈尔滨工业大学 | Dual-wavelength staring type imaging optical receiving system |
| CN113064138A (en) * | 2021-03-15 | 2021-07-02 | 深圳煜炜光学科技有限公司 | Multi-line laser radar based on multi-wavelength configuration |
| CN114296052A (en) * | 2021-12-30 | 2022-04-08 | 宁波未感半导体科技有限公司 | Optical device capable of eliminating blind area and laser radar |
-
2018
- 2018-07-17 CN CN201821126626.7U patent/CN208569042U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109946710A (en) * | 2019-03-29 | 2019-06-28 | 中国科学院上海技术物理研究所 | A kind of more polarized laser imaging devices of dual wavelength |
| CN109946710B (en) * | 2019-03-29 | 2023-12-26 | 中国科学院上海技术物理研究所 | Dual-wavelength multi-polarization laser imaging device |
| CN110568449A (en) * | 2019-10-14 | 2019-12-13 | 自然资源部第二海洋研究所 | Wind-borne rough sea surface laser reflection and transmission matrix calculation method |
| CN110568449B (en) * | 2019-10-14 | 2021-04-16 | 自然资源部第二海洋研究所 | Wind-borne rough sea surface laser reflection and transmission matrix calculation method |
| CN110673156A (en) * | 2019-11-01 | 2020-01-10 | 自然资源部第二海洋研究所 | Double-beam stimulated Brillouin scattering airborne marine laser radar system |
| CN111983590A (en) * | 2020-08-21 | 2020-11-24 | 哈尔滨工业大学 | Dual-wavelength staring type imaging optical receiving system |
| CN111983590B (en) * | 2020-08-21 | 2022-08-05 | 哈尔滨工业大学 | Dual-wavelength staring type imaging optical receiving system |
| CN113064138A (en) * | 2021-03-15 | 2021-07-02 | 深圳煜炜光学科技有限公司 | Multi-line laser radar based on multi-wavelength configuration |
| CN113064138B (en) * | 2021-03-15 | 2024-02-02 | 深圳煜炜光学科技有限公司 | Multi-line laser radar based on multi-wavelength configuration |
| CN114296052A (en) * | 2021-12-30 | 2022-04-08 | 宁波未感半导体科技有限公司 | Optical device capable of eliminating blind area and laser radar |
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