CN206020665U - The Differential Absorption Laser Radar System of composite light beam transmitting-receiving - Google Patents
The Differential Absorption Laser Radar System of composite light beam transmitting-receiving Download PDFInfo
- Publication number
- CN206020665U CN206020665U CN201620721601.6U CN201620721601U CN206020665U CN 206020665 U CN206020665 U CN 206020665U CN 201620721601 U CN201620721601 U CN 201620721601U CN 206020665 U CN206020665 U CN 206020665U
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- wave plate
- polarization
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- light beam
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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
-
- 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
This patent discloses a kind of Differential Absorption Laser Radar System of composite light beam transmitting-receiving, the system that is invented is divided to bundling device, two quarter-wave plates, two plane mirrors, beam expanding lens, telescopes by two pulse lasers, two 1/2nd wave plates, two reflecting mirrors, two polarizations, two filter plates, two photo-detectors, pulse energy monitor and data processing units are constituted.This patent feature is two laser pulses, direct impulse and reference pulse, while launch receiving, wavelength phase dipped beam overlaps, therefore the air path that they experience is identical, and in earth observation, which lands footmark and overlaps.The advantage of this patent is that other atmospheric factor interference effects are eliminated, and the difference for receiving echo is only from absorption difference of the air to two laser pulses on propagation path.
Description
Technical field
This patent is related to DIAL field, especially, is related to Differential Absorption Laser Radar System light beam multiple
A kind of arrangement of conjunction.
Background technology
Present laser radar system atmospheric sounding composition and temperature, humidity, pressure meteorologic parameter, main sharp using Raman
Optical radar and DIAL.Air is a kind of random medium, and the process of air motion is sufficiently complex, therefore describes and swashs
Light beam has certain difficulty with the interaction of air.DIAL application is relatively broad, and this system is to pass through
Two kinds of wavelength laser pulses of measurement transmitting and reception, a kind of referred to as direct impulse, by certain ingredient draws of air；Another kind of title
Be reference pulse, air absorbs unobvious to which；Two kinds of pulse wavelength are very close, obtain detected air from echo difference
A certain parameter, highlight a certain composition of air, or the physical chemistry effect of a certain key element, the impact of other factors is recognized
It is two kinds of laser pulses all to be said to be the same, can be eliminated by difference.
Therefore the concordance configuration of two kinds of pulse wavelength is needs, and when the required precision of detection is higher, to system
Concordance also require that higher.These concordance 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 the transmitting optics/reception photosystem of system is consistent, space
The air path that upper direct impulse and reference pulse are passed through overlaps, and landing footmark overlaps.Direct impulse and reference pulse transmitting
Time interval is shorter, and the change in air this this period is less.The pulse lidar for designing at present, its two kinds of pulses are first
Launch afterwards, this is based on the assumption that air is the constant of solidification in this two pulse launch times interval, in fact due to
The motion (turbulent flow etc.) of air, and this hypothesis can bring error.
More than being based on, for DIAL, two kinds of pulses launch simultaneously and receive simultaneously be a kind of more
Good arrangement, systematic error are less.Transmitting simultaneously and simultaneously reception, and requiring, the pulse of transmitting first two is solved in system configuration closes
Beam, after telescope is received, light beam separately will each carry out Photoelectric Detection by wavelength.
Content of the invention
The purpose of this patent is to provide one kind and serves DIAL, realizes direct impulse and receives pulsed reset
Close the method and structure arrangement for sending and receiving.
Transmitting pulse and reference pulse, rotate through 1/2nd wave plates, make both linear polarization directions vertical, then
By polarization beam combiner, two pulsed light beams are united two into one, compound light beam, through quarter-wave plate, becomes left-handed circle inclined
Shake.
The Rayleigh scattering of air and meter Shi are scattered for the back scattering of circularly polarized light, are remained circularly polarized light, but are rotated
Direction is contrary with incident illumination；Reflection of the hard goal (such as sand ground) to circularly polarized light, remains circularly polarized light, direction of rotation and incidence
Light is contrary；Size and the incident illumination of the backscattering coefficient of air Rayleigh scattering and meter Shi scatterings is left circularly polarized light, or
Right polarized light does not have difference.Equally, the reflection coefficient of hard goal is left circularly polarized light or right-circularly polarized light with incident illumination
Unrelated；Only with respect to incident illumination, reflected light remains circularly polarized light, but direction of rotation is contrary.
Atmospheric components and natural feature on a map (sand ground, vegetation, the water surface), unartificial special handling surface, to left circularly polarized light
It is full symmetric with the back scattering of right-circularly polarized light or reflection.
The circularly polarized light of return is received by telescope, after quarter-wave plate, becomes line polarized light, left-right rotary again
Turn circular polarization state, change the linear polarization being orthogonal, again through polarization beam apparatus, be divided into two-way, interfere filter through respective
Wave plate and detector, are transformed into the signal of telecommunication.
Two detectors, select identical model, responsiveness curve identical silicon detector part or PMT sensitive detection parts, arteries and veins
Rush Energy monitor consistent with the two of data processing unit passage guarantees.
Accordingly, this patent proposes a kind of Differential Absorption Laser Radar System of composite light beam transmitting-receiving, the system bag that is invented
Include telescope 1, beam expanding lens 2, photo-detector A3, photo-detector B4,1/2nd wave plate A5,1/2nd wave plate B6, four/
One wave plate A7, quarter-wave plate A8, polarization beam combiner 9, polarization beam apparatus 10, direct impulse laser instrument 11, reference pulse swash
Light device 12, optical filter A13, optical filter B14, collecting lenses A15, collecting lenses B16, reflecting mirror A17, reflecting mirror B18, pulse energy
Amount monitor 19 and data processing unit 20.Wherein：
Described reference pulse laser instrument 12 sends linearly polarized laser pulse, after reflecting mirror A17 reflections passes through two points
One of wave plate A7；Direct impulse laser instrument B11 sends linearly polarized laser pulse through 1/2nd 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；
Through 2 outgoing of beam expanding lens；
Outgoing beam is reflected or back scattering through air path, again through air path backtracking,
Left or right rounding polarized component in composite light beam during transmitting, is just accordingly transformed into the right side or Left-hand circular polarization component, echo in echo
Collected by telescope 1, through quarter-wave plate B8, circularly polarized light is reduced into line polarized light to the echo of output again, and dextrorotation circle is partially
Shake component and Left-hand circular polarization component two perpendicular linear polarization components of reduction；Complex light comprising perpendicular quadrature linear polarization
Through polarization beam apparatus 10, light beam is divided into two beam by polarization state, and light filtered A13 and collecting lenses A15 is visited by light all the way
Survey device A3 to receive, another road light filtered B14 and collecting lenses B16 is received by photo-detector B4, after being converted by photo-detector
The signal of telecommunication processed by data processing unit.
The advantage of this patent is：Transmitting pulse and reference pulse are compound, make dipulse not existence time interval and space
Interval, eliminates the systematic error that Atmosphere changes bring to detection.
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. photo-detector A, 4. photo-detector B, 5 two/wave plate A, 6. two/wave plate B,
7 quarter-wave plate A, 8. quarter-wave plate B, 9. polarization beam combiner, 10. polarization beam apparatus, 11 direct impulse laser instrument,
12. reference pulse laser instrument, 13 optical filter A, 14. optical filter B, 15 collecting lenses A, 16. collecting lenses B, 17 reflecting mirror A, 18.
Reflecting mirror B, 19. pulse energy monitors, 20. data processing units.
Specific embodiment
Specific implementation of the patent mode is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The specific embodiment that states is merely to illustrate and explains this patent, is not limited to this patent.
1. direct impulse laser instrument 11 and 12 principle of reference pulse laser instrument, type, structure, function, energy, light beam matter
Amount, polarization state are all identical, and are in same spectral band, and simply wavelength difference slightly, is even less than less than 1nm
0.5nm, the linear polarization light pulse of laser pulse oscillator launch simultaneously；
2. two kinds of pulsed light beams are remained in that linear inclined respectively through 1/2nd wave plate A 5,1/2nd wave plate B 6
Polarization state, but the direction of linear polarization can be changed, by rotating 1/2nd wave plates so that the two linear polarization directions for passing through
It is mutually perpendicular to, and completely corresponding with the polarization direction of adjacent polarization beam combiner accreditation thereafter；
3. a kind of 9 pairs of linearly polarized photons of polarization beam combiner are all passed through, and to another kind of 45 degree vertical of linearly polarized photon
Angle of incidence is totally reflected, and so incident direction can be mutually perpendicular to, 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 A 7, and it allows linearly polarized photon, becomes circle partially
Shake light, and linear orthogonal becomes left-handed and dextrorotation, remains composite light beam；
5. composite light beam does not change polarization state through 45 degree of reflecting mirror B 18；
6. the circularly polarized light being combined, through 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 the anti-reflection/antireflective coating of beam expander does not change light beam
Polarization state；
7. composite light beam is launched, it is meant that while realizing two kinds of pulses, same light path transmitting, the big gas circuit of process
Footpath is identical, and the footmark that light beam falls 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 reflection coefficient on natural target surface, for left-handed
Circle skewness and right-hand circular polarization state are identicals.These are highly advantageous for the precision for improving detection system；
8. echo light is collected by telescope 1, and 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, left/right circular polarization state in light beam, and
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 adjacent its
The polarization direction that polarization beam apparatus 10 afterwards are allowed is into 45 degree of angles；
10. polarization beam apparatus 10 are identicals with polarization beam combiner 9, and their light paths and function are reciprocal.Orthogonal linear
Polarization state composite light beam is divided into two beams by polarization state after polarization beam apparatus 10；
11. separate linear polarized beams enter respective interferometric filter, collecting lenses and photo-detector, finally enter
Data processing unit；
12., in order to eliminate the change of impulse ejection energy, bring error to detection, and two kinds of transmitting pulses are designed with pulse energy
Amount monitor, in order to the intensity of normalization echo；Photo-detector is using the consistent device of same model, Performance Characteristics, pulse energy
Amount monitor, data processing unit are that two kinds of pulses are public, work under same clock control；
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means, in order to avoid unnecessary repetition, this patent to various can
The compound mode of energy is no longer separately illustrated.
Additionally, combination in any can also be carried out between a variety of embodiments of this patent, as long as which is without prejudice to this
The thought of patent, its should equally be considered as this patent disclosure of that.
Claims (2)
1. the Differential Absorption Laser Radar System that a kind of composite light beam is received and dispatched, including telescope (1), beam expanding lens (2), photo-detector
A (3), photo-detector B (4), 1/2nd wave plate A (5), 1/2nd 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 instrument (11), reference pulse laser instrument (12),
Optical filter A (13), optical filter B (14), collecting lenses A (15), collecting lenses B (16), reflecting mirror A (17), reflecting mirror B (18),
Pulse energy monitor (19) and data processing unit (20), it is characterised in that：
Described reference pulse laser instrument (12) sends linearly polarized laser pulse, after reflecting mirror A (17) reflections passes through two points
One of wave plate A (7)；Direct impulse laser instrument (11) sends linearly polarized laser pulse through 1/2nd 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 through quarter-wave plate A (7)
Composite light beam；Through beam expanding lens (2) outgoing；
Outgoing beam is reflected or back scattering through air path, again through air path backtracking, transmitting
When composite light beam in left or right rounding polarized component, be just accordingly transformed into the right side or Left-hand circular polarization component in echo, echo is hoped
Remote mirror (1) is collected, and through quarter-wave plate B (8), circularly polarized light is reduced into line polarized light to the echo of output again, and dextrorotation circle is partially
Shake component and Left-hand circular polarization component two perpendicular linear polarization components of reduction；Complex light comprising perpendicular quadrature linear polarization
Through polarization beam apparatus (10), light beam is divided into two beam by polarization state, all the way filtered A (13) of light and collecting lenses A (15)
Received by photo-detector A (3), filtered B (14) of another road light and collecting lenses B (16) are received by photo-detector B (4), by
The signal of telecommunication after photo-detector conversion is processed by data processing unit.
2. the Differential Absorption Laser Radar System that a kind of composite light beam according to claim 1 is received and dispatched, it is characterised in that：
Described photo-detector A (3) and photo-detector B (4) is identical silicon detector part or PMT sensitive detection parts.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201620393412 | 2016-05-03 | ||
| CN2016203934120 | 2016-05-03 |
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| CN206020665U true CN206020665U (en) | 2017-03-15 |
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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 |
| CN201610538919.5A Active CN106019311B (en) | 2016-05-03 | 2016-07-11 | A kind of Differential Absorption Laser Radar System of composite light beam transmitting-receiving |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019311A (en) * | 2016-05-03 | 2016-10-12 | 中国科学院上海技术物理研究所 | Difference absorption lidar system for composite light beam transmission and reception |
| CN108574533A (en) * | 2018-03-09 | 2018-09-25 | 长春理工大学 | A kind of Shared aperture laser communication optical transmitter and receiver based on optical phased array |
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| CN107272013A (en) * | 2017-08-02 | 2017-10-20 | 周虎基 | Laser radar apparatus and laser radar detecting system |
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| 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 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6873716B1 (en) * | 1995-11-14 | 2005-03-29 | ARETé ASSOCIATES | Confocal-reflection streak lidar apparatus with strip-shaped photocathode, for applications at a wide range of scales |
| CN102004255B (en) * | 2010-09-17 | 2012-07-04 | 中国科学院上海技术物理研究所 | Chirp amplitude laser infrared radar distance-Doppler zero-difference detection system |
| CN103855599B (en) * | 2014-01-17 | 2016-08-24 | 中国科学院上海技术物理研究所 | Utilize the method that scanning confocal chamber F-P interferometer realizes laser rrequency-offset-lock |
| CN104035085A (en) * | 2014-06-12 | 2014-09-10 | 中国科学院上海技术物理研究所 | Self-calibration method for differential absorption laser radar system |
| CN206020665U (en) * | 2016-05-03 | 2017-03-15 | 中国科学院上海技术物理研究所 | The Differential Absorption Laser Radar System of composite light beam transmitting-receiving |
-
2016
- 2016-07-11 CN CN201620721601.6U patent/CN206020665U/en not_active Withdrawn - After Issue
- 2016-07-11 CN CN201610538919.5A patent/CN106019311B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106019311A (en) * | 2016-05-03 | 2016-10-12 | 中国科学院上海技术物理研究所 | Difference absorption lidar system for composite light beam transmission and reception |
| 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 |
| CN108574533A (en) * | 2018-03-09 | 2018-09-25 | 长春理工大学 | A kind of Shared aperture laser communication optical transmitter and receiver based on optical phased array |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106019311B (en) | 2018-06-26 |
| CN106019311A (en) | 2016-10-12 |
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