CN106019311B - A kind of Differential Absorption Laser Radar System of composite light beam transmitting-receiving - Google Patents
A kind of Differential Absorption Laser Radar System of composite light beam transmitting-receiving Download PDFInfo
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- CN106019311B CN106019311B CN201610538919.5A CN201610538919A CN106019311B CN 106019311 B CN106019311 B CN 106019311B CN 201610538919 A CN201610538919 A CN 201610538919A CN 106019311 B CN106019311 B CN 106019311B
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- wave plate
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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
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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
- 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
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- 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)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of Differential Absorption Laser Radar Systems of composite light beam transmitting-receiving, the system invented is divided to bundling device, two quarter-wave plates, two plane mirrors, beam expanding lens, telescopes by two pulse lasers, two half wave plates, two speculums, two polarizations, two filter plates, two optical detectors, pulse energy monitor and data processing unit are formed.The invention is characterized in that two laser pulses, direct impulse and reference pulse, while emitting reception, wavelength phase dipped beam overlaps, therefore the air path that they undergo is identical, and in earth observation, landing footmark overlaps.The advantage of the invention is that other atmospheric factor interference effects are eliminated, receiving the difference of echo, to be only from air on propagation path different to the absorption of two laser pulses.
Description
Technical field
The present invention relates to differential absorption lidar fields, particularly, are related to Differential Absorption Laser Radar System light beam and answer
A kind of arrangement closed.
Background technology
Present laser radar system atmospheric sounding ingredient and temperature, humidity, pressure meteorologic parameter, are mainly swashed using Raman
Optical radar and differential absorption lidar.Air is a kind of random medium, and the process of air motion is sufficiently complex, therefore describes to swash
The interaction of light beam and air has certain difficulty.For differential absorption lidar using relatively broad, this system is to pass through
It measures transmitting and receives two kinds of wavelength laser pulses, one kind is referred to as direct impulse, by certain ingredient draws of air；Another kind claims
For reference pulse, air absorbs unobvious to it；Two kinds of pulse wavelength are very close, and detected air is obtained from echo difference
A certain parameter, highlight a certain ingredient of air or the physical chemistry effect of a certain element, the influence of other factors recognized
All to say it is the same for two kinds of laser pulses, can be eliminated by difference.
Therefore the consistency configuration of two kinds of pulse wavelength is needed, and the required precision for working as detection is higher, to system
Consistency also require it is higher.These consistency are embodied in, and direct impulse and reference pulse wavelength are close, are thus approximately considered
Air is consistent with Rayleigh scattering to their Mie scattering, and the light transmittance of transmitting optics/reception photosystem of system is consistent, space
The air path that upper direct impulse and reference pulse pass through overlaps, and landing footmark overlaps.Direct impulse and reference pulse transmitting
Time interval is shorter, and the variation in this this period of air is smaller.The pulse lidar designed at present, two kinds of pulses are first
Emit afterwards, this is based on the assumption that in this two pulse launch time intervals, air be solidification it is constant, in fact due to
The movement (turbulent flow etc.) of air, and this hypothesis can bring error.
Based on the above, for differential absorption lidar, two kinds of pulses emit simultaneously and receive simultaneously be it is a kind of more
Good arrangement, systematic error smaller.Emit simultaneously and receive and require simultaneously solution transmitting first two pulse in system configuration to close
Beam, after telescope receives, light beam will be separated by wavelength and respectively carry out Photoelectric Detection.
Invention content
The object of the present invention is to provide one kind to serve differential absorption lidar, realizes direct impulse and receives pulsed reset
Close the method sent and received and structure arrangement.
Emit pulse and reference pulse, rotated by half wave plate, the linear polarization direction for making the two is vertical, then
By polarization beam combiner, two pulsed light beams are combined into one, compound light beam, by quarter-wave plate, it is inclined to become left-handed circle
Light shake with launching after right-hand circular polarization photoreactivation by expanding.
The Rayleigh scattering and meter Shi of air scatter the back scattering for circularly polarized light, are still circularly polarized light, but rotate
Direction is opposite with incident light；Reflection of the hard goal (such as sand ground) to circularly polarized light is still circularly polarized light, direction of rotation and incidence
Light is opposite；The size and incident light of air Rayleigh scattering and the backscattering coefficient of meter Shi scatterings are left circularly polarized lights, still
Right polarised light does not have difference.Equally, the reflectance factor of hard goal and incident light are left circularly polarized light or right-circularly polarized light
It is unrelated；Only with respect to incident light, reflected light is still circularly polarized light, but direction of rotation is opposite.
Atmospheric components and natural feature on a map (sand ground, vegetation, the water surface), unartificial specially treated surface, to left circularly polarized light
Back scattering or reflection with right-circularly polarized light are full symmetric.
The circularly polarized light of return is received by telescope, after quarter-wave plate, and becomes linearly polarized light, left-right rotary
Turn circular polarization state, change the linear polarization being orthogonal, again by polarization beam apparatus, be divided into two-way, filtered by respective interference
Wave plate and detector, are transformed into electric signal.
Two detectors select identical model, the silicon detector part of responsiveness curve identical or PMT sensitive detection parts, arteries and veins
Two channels for rushing Energy monitor and data processing unit ensure unanimously.
Accordingly, the present invention proposes a kind of Differential Absorption Laser Radar System of composite light beam transmitting-receiving, the system packet invented
Include telescope 1, beam expanding lens 2, optical detector A3, optical detector B4, half wave plate A5, half wave plate B6, four/
One wave plate A7, quarter-wave plate A8, polarization beam combiner 9, polarization beam apparatus 10, direct impulse laser 11, reference pulse swashs
Light device 12, optical filter A13, optical filter B14, convergent lens A15, convergent lens B16, speculum A17, speculum B18, pulse energy
Measure monitor 19 and data processing unit 20.Wherein：
The reference pulse laser 12 sends out linearly polarized laser pulse, and two points are passed through after speculum A17 reflections
One of wave plate A7；Direct impulse laser B11 sends out linearly polarized laser pulse by half wave plate B6, and two beam laser are mutual
Orthogonal beams；Two beam orthogonal linear polarisation laser beams are combined with each other by polarization beam combiner 9；Laser beam after compound passes through four
/ mono- wave plate A7 becomes Left-hand circular polarization light beam and composite light beam of the right-hand circular polarization light beam on time and cross-sectional distribution；
It is emitted through beam expanding lens 2；
Outgoing beam passes through air path, is reflected or back scattering, again through air path backtracking,
Left or right rounding polarized component in composite light beam during transmitting is just accordingly transformed into right or Left-hand circular polarization component, echo in echo
It is collected by telescope 1, for the echo of output by quarter-wave plate B8, circularly polarized light is reduced into linearly polarized light again, and dextrorotation circle is inclined
Shake component and Left-hand circular polarization component two perpendicular linear polarization components of reduction；Include the complex light of perpendicular quadrature linear polarization
Beam passes through polarization beam apparatus 10, and light beam is divided into two by polarization state, and light is visited through optical filter A13 and convergent lens A15 by light all the way
It surveys device A3 to receive, another way light is received through optical filter B14 and convergent lens B16 by optical detector B4, after being converted by optical detector
Electric signal handled by data processing unit.
The advantage of the invention is that：Emit pulse and reference pulse is compound, make dipulse that time interval and space be not present
Interval eliminates the systematic error that Atmosphere changes carry out surveying tape.
Description of the drawings
Fig. 1 is the Differential Absorption Laser Radar System structure chart of composite light beam transmitting-receiving, in figure：
1. telescope, 2. beam expanding lens, 3. optical detector A, 4. optical detector B, 5 two/wave plate A, 6. 2/wave plate B,
7 quarter-wave plate A, 8. quarter-wave plate B, 9. polarization beam combiners, 10. polarization beam apparatus, 11 direct impulse lasers,
12. reference pulse laser, 13 optical filter A, 14. optical filter B, 15 convergent lens A, 16. convergent lens B, 17 speculum A, 18.
Speculum B, 19. pulse energy monitors, 20. data processing units.
Specific embodiment
The specific embodiment of the present invention is described in detail below in conjunction with attached drawing.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
1. direct impulse laser 11 and 12 principle of reference pulse laser, type, structure, function, energy, light beam matter
Amount, polarization state are all identical, and in same spectral band, and the difference that only wavelength slightly has is even less than less than 1nm
0.5nm, the linear polarization light pulse of laser pulse oscillator emit simultaneously；
2. two kinds of pulsed light beams still maintain linear polarization by half wave plate A5, half wave plate B 6 respectively
State, but the direction of linear polarization can be changed, by rotating half wave plate so that the two linear polarization direction phases passed through
It is mutually vertical and completely corresponding with the polarization direction of polarization beam combiner accreditation closely thereafter；
3. polarization beam combiner 9 all penetrates a kind of linearly polarized photon, and to another 45 degree vertical of linearly polarized photon
Incidence angle is totally reflected, and incident direction can be mutually perpendicular in this way, and polarization direction also orthogonal light beam overlap (when
Between/cross section) together；
4. the composite light beam of linear orthogonal passes perpendicularly through quarter-wave plate A7, it allows linearly polarized photon, becomes circular polarization
Light, linear orthogonal become left-handed and dextrorotation, are still composite light beam；
5. composite light beam passes through 45 degree of speculum B 18, do not change polarization state；
6. compound circularly polarized light, by beam expander 2, its suitable inverted refractor, the beam diameter of light beam
Increase, the angle of divergence reduce, and angle multiplying power is equal to the enlargement ratio of beam expander, and anti-reflection/antireflective coating of beam expander does not change light beam
Polarization state；
7. composite light beam is launched, it is meant that realizes while two kinds of pulses, same light path emits, the big gas circuit of process
Diameter is identical, and the footmark that light beam is fallen on target (such as atural object) surface is identical, while by atmospheric scattering or by target surface
Reflection, the path of return are identical；The backscattering coefficient of air and the reflectance factor on natural target surface, for left-handed
Circle skewness and right-hand circular polarization state are identical.These are highly advantageous for the precision for improving detection system；
8. echo light is collected by telescope 1, the metallic reflective coating of telescope does not change polarization state, to two kinds of circularly polarized lights
Left/right direction of rotation is fair；
9. the echo beam that telescope is collected, after quarter-wave plate B 8, the left/right circular polarization state in light beam, again
It is reduced into horizontal/vertical linear polarization；Around light beam direction of advance, rotate quarter-wave plate, make the optical axis of crystal with closely its
The polarization direction that polarization beam apparatus 10 afterwards is allowed is into 45 degree of angles；
10. polarization beam apparatus 10 and polarization beam combiner 9 are identical, their light paths and function are reciprocal.Orthogonal linear
Polarization state composite light beam passes through after polarization beam apparatus 10, is divided into two beams by polarization state；
11. separated linear polarized beam enters respective interferometric filter, convergent lens and optical detector, finally enter
Data processing unit；
12. in order to eliminate the variation of impulse ejection energy, carry out error to surveying tape, two kinds of transmitting pulses are designed with pulse energy
Monitor is measured, to normalize the intensity of echo；Optical detector is using the consistent device of similary model, performance characteristics, pulse energy
It is public for two kinds of pulses to measure monitor, data processing unit, works under same clock control；
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (2)
1. a kind of Differential Absorption Laser Radar System of composite light beam transmitting-receiving, including telescope (1), beam expanding lens (2), optical detector
A (3), optical detector B (4), half wave plate A (5), half wave plate B (6), quarter-wave plate A (7), a quarter
Wave plate B (8), polarization beam combiner (9), polarization beam apparatus (10), direct impulse laser (11), reference pulse laser (12),
Optical filter A (13), optical filter B (14), convergent lens A (15), convergent lens B (16), speculum A (17), speculum B (18),
Pulse energy monitor (19) and data processing unit (20), it is characterised in that：
The reference pulse laser (12) sends out linearly polarized laser pulse, and two points are passed through after speculum A (17) reflections
One of wave plate A (5)；Direct impulse laser (11) sends out linearly polarized laser pulse by half wave plate B (6), and two beams swash
Light is mutual orthogonal beams；Two beam orthogonal linear polarisation laser beams are combined with each other by polarization beam combiner (9)；Laser after compound
Beam becomes Left-hand circular polarization light beam and right-hand circular polarization light beam on time and cross-sectional distribution across quarter-wave plate A (7)
Composite light beam；It is emitted through beam expanding lens (2)；
Outgoing beam passes through air path, is reflected or back scattering, again through air path backtracking, transmitting
When composite light beam in left or right rounding polarized component, be just accordingly transformed into right or Left-hand circular polarization component, echo in echo and hoped
Remote mirror (1) is collected, and for the echo of output by quarter-wave plate B (8), circularly polarized light is reduced into linearly polarized light again, and dextrorotation circle is inclined
Shake component and Left-hand circular polarization component two perpendicular linear polarization components of reduction；Include the complex light of perpendicular quadrature linear polarization
Beam passes through polarization beam apparatus (10), and light beam is divided into two by polarization state, and light is through optical filter A (13) and convergent lens A (15) all the way
It being received by optical detector A (3), another way light is received through optical filter B (14) and convergent lens B (16) by optical detector B (4), by
Electric signal after optical detector conversion is handled by data processing unit.
2. a kind of Differential Absorption Laser Radar System of composite light beam transmitting-receiving according to claim 1, it is characterised in that：Institute
The optical detector A (3) and optical detector B (4) stated is identical silicon detector part or PMT sensitive detection parts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620393412 | 2016-05-03 | ||
| CN2016203934120 | 2016-05-03 |
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| CN106019311A CN106019311A (en) | 2016-10-12 |
| CN106019311B true CN106019311B (en) | 2018-06-26 |
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| CN201620721601.6U Withdrawn - After Issue CN206020665U (en) | 2016-05-03 | 2016-07-11 | The Differential Absorption Laser Radar System of composite light beam transmitting-receiving |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106019311B (en) * | 2016-05-03 | 2018-06-26 | 中国科学院上海技术物理研究所 | A kind of Differential Absorption Laser Radar System of composite light beam transmitting-receiving |
| CN108205142B (en) * | 2016-12-16 | 2024-05-10 | 武汉万集光电技术有限公司 | Laser radar system and ranging method |
| CN106646757B (en) * | 2017-03-07 | 2021-01-26 | 昂纳信息技术（深圳）有限公司 | Multiplexer and light combination method thereof |
| CN107272013A (en) * | 2017-08-02 | 2017-10-20 | 周虎基 | Laser radar apparatus and laser radar detecting system |
| CN107356939B (en) * | 2017-09-11 | 2020-01-14 | 安徽科创中光科技有限公司 | High-low altitude double-receiving ozone differential absorption laser radar device |
| CN108574533B (en) * | 2018-03-09 | 2020-06-09 | 长春理工大学 | Common-caliber laser communication optical transmitter and receiver based on optical phased array |
| CN109187365A (en) * | 2018-08-22 | 2019-01-11 | 中国科学院上海光学精密机械研究所 | Ocean profile dual wavelength polarization optics parameter estimator instrument |
| CN109143202B (en) * | 2018-09-21 | 2022-08-26 | 南昌航空大学 | Stimulated Brillouin scattering laser radar system device under simulated ocean turbulence |
| 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 |
| CN110187358B (en) * | 2019-06-14 | 2024-01-09 | 中国科学技术大学 | Polarization noise isolation system of receiving and transmitting coaxial laser radar |
| CN113126063A (en) * | 2021-04-21 | 2021-07-16 | 西安理工大学 | Device for detecting full stokes vector of laser radar echo in real time |
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2016
- 2016-07-11 CN CN201610538919.5A patent/CN106019311B/en active Active
- 2016-07-11 CN CN201620721601.6U patent/CN206020665U/en not_active Withdrawn - After Issue
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| CN106019311A (en) | 2016-10-12 |
| CN206020665U (en) | 2017-03-15 |
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