CN206411262U - Multi-beam scanning apparatus - Google Patents
Multi-beam scanning apparatus Download PDFInfo
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- CN206411262U CN206411262U CN201621462118.7U CN201621462118U CN206411262U CN 206411262 U CN206411262 U CN 206411262U CN 201621462118 U CN201621462118 U CN 201621462118U CN 206411262 U CN206411262 U CN 206411262U
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Abstract
The utility model is related to Radar Technology field, and in particular to a kind of multi-beam scanning apparatus, the device includes：Signal transmitter unit 10, the first optical unit 201, the second optical unit 202, signal receiving unit 30 and distance analysis unit 40.Multi-beam scanning apparatus of the present utility model is a kind of Laser Radar Scanning mode based on diffraction, use fixed diffraction grating, change the scanning that the angle of diffraction realizes laser radar by changing optical maser wavelength, aforesaid way can accomplish no mechanical moving element, scanning angle is wide, can for example reach+/ more than 4 degree, sweep speed is fast, 10kHz can for example be exceeded, while reliability is greatly improved.
Description
Technical field
The utility model is related to Radar Technology field, and in particular to a kind of multi-beam scanning apparatus.
Background technology
Laser radar uses transmitting laser irradiation object, by the delay of object return laser light, phase or displacement
To analyze distance and velocity information.This is a time-honored technology, in recent years, and as 3D printing is measured, ground mapping is auxiliary
Help and automatic Pilot, the development of the industry such as unmanned plane, the laser radar technique and the high speed development of application also driven.
2D and 3D laser radar can provide the information of solid space, and technical scheme main at present is all by list
The light path of dot laser rangefinder or multiple spot laser range finder is scanned to realize, how quick and highly reliable realization is swept
Retouch into a technical bottleneck.
Existing scanning technique includes：
I. machinery/micromechanics scanning, including：（Slowly, poor reliability）
1. turntable is scanned
2. vibration mirror scanning
3. exposure subsystem is scanned
4.MEMS scarnning mirrors
Ii. acousto-optic scanning（Quite scanning is realized with changing the diffraction grating cycle）
Iii. LCD phased array is scanned（Slowly）
Iv. waveguide phase-array scanning（Component without maturation is supporting, it is impossible to high volume applications）.
In view of scanning means of the prior art is respectively provided with mechanical moving element, scanning range and sweep speed need to be carried
Height, therefore overcome above defect of the prior art to turn into this area technology urgently to be resolved hurrily there is provided a kind of new scanning means
Problem.
The content of the invention
There is provided a kind of multi-beam scanning apparatus for the drawbacks described above that the purpose of this utility model is for prior art.
The purpose of this utility model can be realized by following technical measures：
A kind of multi-beam scanning apparatus, the device includes：
At least one is configured as the signal transmitter unit for launching the array laser pulse of different wave length；
First optical unit, for being collimated successively to the array laser pulse and diffraction is to form transmitting light beam；
Second optical unit, for carrying out diffraction and standard successively to transmitting light beam of the light beam through target scattering to be measured or reflection
Directly, to form Returning beam；
It is configured as receiving the signal receiving unit of the Returning beam of different wave length；And
Distance analysis unit, carries out signal analysis to determine target range to be measured to Returning beam.
Preferably, described signal transmitter unit includes successively：
It is configured to launch the tunable laser source of different wave length laser beams；
Impulse generator for laser beam to be formed to laser pulse；
For the image intensifer for being amplified laser pulse；With
For laser pulse progress branch to be formed into the optical branching device of array laser pulse.
Preferably, first optical unit successively include be used for array laser pulse is collimated diversing lens,
With the first diffraction grating.
Preferably, second optical unit includes the second diffraction grating and the reception for being collimated to light beam successively
Lens.
Preferably, first diffraction grating and the second diffraction grating form entirety.
Preferably, the signal receiving unit includes being used to receive the photodetector of Returning beam, for photodetector
Receive the signal amplifying and conditioning circuit that signal carries out signal transacting.
Preferably, the quantity of the tunable laser source is more than or equal to two, and the quantity of the photodetector is more than etc.
In two, the photodetector is corresponded with the tunable laser source.
Preferably, the distance analysis unit compares timer or phase discriminator including multiple ADC or multiple.
Preferably, the multi-beam scanning apparatus also includes a calculation control unit, for tunable laser source
Wavelength is adjusted, and is adjusted for the multiplication factor to image intensifer, for trigger generator, for according to difference
The relation of distance acquisition target range to be measured and wavelength corresponding to wavelength, the relationship map in conjunction with wavelength and angle go out to be measured
The relation of target range and angle.
Multi-beam scanning apparatus of the present utility model is a kind of Laser Radar Scanning mode based on diffraction, is spread out using fixation
Grating is penetrated, changes the scanning that the angle of diffraction realizes laser radar by changing optical maser wavelength, aforesaid way can accomplish no machine
Tool moving component, scanning angle is wide, for example, can reach +/- more than 4 degree, sweep speed is fast, for example, can exceed 10kHz, together
When reliability be greatly improved.
Brief description of the drawings
Fig. 1 is the structured flowchart of the preferred embodiment of multi-beam scanning apparatus first of the utility model embodiment.
Fig. 2 is the structured flowchart of the preferred embodiment of multi-beam scanning apparatus second of the utility model embodiment.
Fig. 3 is the utility model embodiment multi-beam scanning apparatus schematic diagram.
Fig. 4 is the utility model embodiment multi-beam scanning apparatus schematic diagram.
Fig. 5 is the utility model embodiment medium wavelength and angle of diffraction variation diagram.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with the accompanying drawings and specifically
Embodiment is described in further detail to the utility model.It should be appreciated that specific embodiment described herein is only to solve
The utility model is released, is not used to limit the utility model.
Hereinafter, refer to the attached drawing is more fully understood to many aspects of the present utility model.Part in accompanying drawing may not
It is drawn to scale.Alternatively, it is preferred that emphasis is clearly demonstrate part of the present utility model.In addition, in the accompanying drawings some regard
In figure, identical reference indicates corresponding part.
Word " exemplary " as used herein or " illustrative " expression are used as example, example or explanation.Retouch herein
Any embodiment stated as " exemplary " or " illustrative ", which is not necessarily to be construed as, to be preferred relative to other embodiment or has
Profit.All embodiments described below be illustrative embodiments be there is provided these illustrative embodiments in order that
Those skilled in the art make and using embodiment of the disclosure and expection be not intended to limit the scope of the present disclosure, the disclosure
Scope is defined by the claims.In other embodiments, well known feature and method is describe in detail to obscure this
Utility model.For purpose described herein, term " on ", " under ", "left", "right", "front", "rear", " vertical ", " level " and
Its derivative words will be relevant with the utility model that such as Fig. 1 is oriented.Moreover, have no intent to by technical field above, background technology,
Any theoretical limitation expressed or implied perhaps provided in utility model in detailed description below.It should also be clear that in the accompanying drawings
Show that with the specific device and process described in discussion below book be the utility model structure that limits in the following claims
The simple examples embodiment of think of.Therefore, the specific size related to presently disclosed embodiment and other physical features are not
Should be understood it is restricted, unless claims are separately clearly stated.
Fig. 1 shows a kind of multi-beam scanning apparatus, including：Signal transmitter unit 10, the first optical unit 201, second
Optical unit 202, signal receiving unit 30 and distance analysis unit 40.Wherein, signal transmitter unit 10 is configured as transmitting not
The array laser pulse of co-wavelength；First optical unit 201 is used to collimate and diffraction the array laser pulse successively
To form transmitting light beam；Second optical unit 202 is used to enter transmitting light beam of the light beam through target scattering to be measured or reflection successively
Row diffraction and collimation, to form Returning beam；Signal receiving unit 30 is configured as receiving the Returning beam of different wave length；Distance
Analytic unit 40 carries out signal analysis to determine target range to be measured to Returning beam.
In first preferred embodiment, signal transmitter unit 10 further includes successively：Tunable laser source
101st, impulse generator 102, image intensifer 103 and optical branching device 104, wherein, tunable laser source 101 is configured to
Launch different wave length laser beams；Impulse generator 102 is used to laser beam forming laser pulse；Image intensifer 103 is used for
Laser pulse is amplified；Optical branching device 104 is used to carry out branch to form array laser pulse by laser pulse.First light
Learn the diffraction grating 2012 of diversing lens 2011 and first that unit 201 includes being used to collimate array laser pulse successively.
Second optical unit 202 includes the second diffraction grating 2021 and the receiving lens 2022 for being collimated to light beam successively.Letter
Photodetector 301 that number receiving unit 30 includes being used for receiving Returning beam, believe for receiving signal to photodetector 301
Number processing signal amplifying and conditioning circuit 302.Photodetector 301 is photo-electric conversion element, can be PD, PIN, APD or photoelectricity
Multiplier tube etc..
The multi-beam scanning apparatus of the utility model embodiment is a kind of Laser Radar Scanning mode based on diffraction, is used
The diffraction element such as reflecting grating or body grating, changes the scanning that the angle of diffraction realizes laser radar by changing optical maser wavelength；
Refer to shown in Fig. 3 and Fig. 4, diffraction grating is also disposed in receiving light path, the light of transmitting is returned on fixed detector.This
One mode can accomplish no mechanical moving element, while scanning angle can reach +/- more than 4 degree, sweep speed exceedes
10kHz。
In second preferred embodiment, the first diffraction grating 2012 and the second diffraction grating 2021 can form whole
Body, as diffraction grating 60, are referred to shown in Fig. 2, and distance analysis unit 30 compares timer or mirror including multiple ADC or multiple
Phase device, the multi-beam scanning apparatus also includes a calculation control unit 50, enters for the wavelength to tunable laser source 101
Row regulation, is adjusted for the multiplication factor to image intensifer 102, for trigger generator 103, for according to difference
The relation of distance acquisition target range to be measured and wavelength corresponding to wavelength, the relationship map in conjunction with wavelength and angle go out to be measured
The relation of target range and angle.Calculation control unit 50 is based on ARM chips, fpga chip, dsp chip or the special chip
Chip, with timing or survey phase function, and data analysis capabilities.Calculation control unit 50 is also associated with communication interface 50a.
In addition, the quantity of tunable laser source 101 is more than or equal to two, accordingly, the quantity of photodetector 301 is big
In equal to two, the photodetector 301 is corresponded with the tunable laser source 101.
That is, signal transmitter unit 10 can be launched using the light of one or more tunable laser sources 301
Unit, or a signal transmitter unit 10 tunable laser source 101 by way of the multichannel light beam that shunt is separated,
The laser sent for collimation laser beam, or it is multiple between angled laser beam.In addition, in signal transmitter unit 10
The wavelength of tunable laser source 101 can be modified by communication interface or trigger signal.Diffraction grating is included but not
It is limited to reflecting grating, the diffraction optical element such as body grating, and other gratings and speculum, the assembly of lens.Diffraction grating
Can be that transmitting and reception are each with one group of grating or transmitting and the shared one group of grating of reception.Calculation control unit 50 is sent out
Go out trigger signal, trigger Laser emission, start to receive while triggering receiving unit 30, or the triggering laser of calculation control unit 50
Transmitting, the triggering receiving unit 30 of transmitter unit 10 starts to receive.Data are sent into calculation control unit 50 by receiving unit 30, are calculated
The distance of target to be measured.Equipment and other equipment are attached by communication interface 50a by wired or wireless mode.
Diffraction grating is a kind of by very important optics intensive, that equidistantly parallel groove is constituted, there is reflected light
Grid, the various forms such as transmissive phase-gratings, but Physical Mechanism is basically identical, and its dispersion can all be represented with below equation：
D* (sin θ+sin φ)=m λ formulas（1）
θ is incidence angle in formula, and φ is the angle of diffraction, and λ is wavelength, and m is diffraction time.
It can be seen that, change wavelength, the angle of diffraction will change., can be right more intuitively to see relation between the two
Formula (1) declines point：
D λ/d φ=d*cos φ/m formulas（2）
Because d*cos φ/m is a constant, that is to say, that the angle of diffraction and wavelength are linear relations in a small range,
Wavelength change, angle of diffraction respective change.
In the case of for laser radar, the change of angle of diffraction is very big, it is impossible to use formula（2）To calculate, and should be right
Formula（1）Deformed, it is specific as follows：
(- the φ 2 of φ 1)=asin (m* (λ 1- λ 2)/d) formula（3）
With m=1, d=0.82 μm, near λ=1550nm, exemplified by θ=85 degree, refer to shown in Fig. 5, transverse axis is wavelength, the longitudinal axis
It is angle of diffraction, wavelength change 100nm, angle change is close to 20 degree.
The method for carrying out multibeam scanning using the device of the present embodiment comprises the following steps：
Step a：Generate the array laser pulse of first wave length；
Step b：By diffraction grating to form transmitting light beam after being collimated successively to array laser pulse；
Step c：By target to be measured described in the transmitting beam direction, and by from the target scattering to be measured or reflection
Light beam is collimated to form Returning beam again after diffraction grating；
Step d：Receive the Returning beam and Returning beam is amplified and signal condition after to Returning beam carry out
Signal analysis is to determine target range to be measured；
Step e：Generate the array laser pulse of the i-th wavelength, repeat step b to step d, wherein, i=2,3 ... ..., n；
Step f：Distance according to corresponding to different wave length obtains the relation of target range to be measured and wavelength, in conjunction with wavelength
Go out the relation of target range to be measured and angle with the relationship map of angle to reconstruct the two-dimensional space structure of target to be measured.
Wherein, repeat step b to step d test, it is possible to object distance and the relation of wavelength are obtained, further according to ripple
The relationship map of long and angle goes out the relation of object distance and angle, reconstructs the space structure of two dimension；The two dimension of reconstruct is empty
Between structure be sent out to by communication structure and need the system of two-dimensional space structure.
Specifically, refer to shown in Fig. 2, calculation control unit 50 sets the wavelength of tunable laser source, setting light is put
The multiple of big device, trigger generator forms laser pulse, and laser pulse is enlarged into the laser arteries and veins of ranging by fiber amplifier
Punching.Laser pulse is divided into multichannel, such as 4 tunnels, 8 tunnels, 32 tunnels etc. by optical branching device；Laser light of the multichannel light equivalent to array
Source, is launched by collimated, there is angle between multichannel light, forms multiline transmission.Light after collimation incides diffraction grating,
Angle changes during outgoing, and the angle of outgoing has corresponding relation with incident wavelength.Outgoing beam is run into after target, hair
Raw scattering is reflected, and is returned to, is incided the diffraction grating before receiving lens.Diffraction grating before receiving lens can make
The light of different wave length is returned with same angle and incided in receiving lens.Receiving lens will be inclined to the light of different angles because of wavelength
Beam convergence is on same detector, such as same PD, the photo-detector such as APD or photomultiplier；Meanwhile, multiple laser lights
Source sends the light being then back to, and can return on different detectors, receives multi-thread signal；Multi-thread signal is put by circuit
Greatly, nurse one's health as suitable signal, through distance analysis module 40（ADC is gathered or through comparator）Special timing is triggered more afterwards
Chip, obtains the flight time；ADC signal or time-of-flight signals is admitted to calculation control unit 50, by related algorithm,
Filtering algorithm etc., obtains the more accurate flight time, and is the distance that a certain wavelength measurement is arrived through time conversion.Change ripple
Grow, the corresponding object range information of multiple wavelength can be obtained by repeating above step, because of wavelength and angle of diffraction presence fixation
Corresponding relation, it is possible to obtain multi-thread angle and distance information, here it is need 3D radar informations；This information can be with
Directly through communications interface transmission to outside；In case of need, calculation control unit 50 can also by clustering algorithm etc., by
Multi-thread 3D radar informations analyze multiple objects, object size and corresponding 3D angle informations, are passed by communication interface
It is defeated to arrive outside.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modifications, equivalent substitutions and improvements made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (9)
1. a kind of multi-beam scanning apparatus, it is characterised in that the device includes：
At least one is configured as the signal transmitter unit for launching the array laser pulse of different wave length；
First optical unit, for being collimated successively to the array laser pulse and diffraction is to form transmitting light beam；
Second optical unit, for carrying out diffraction and collimation successively to transmitting light beam of the light beam through target scattering to be measured or reflection,
To form Returning beam；
It is configured as receiving the signal receiving unit of the Returning beam of different wave length；And
Distance analysis unit, carries out signal analysis to determine target range to be measured to Returning beam.
2. multi-beam scanning apparatus according to claim 1, it is characterised in that described signal transmitter unit is wrapped successively
Include：
It is configured to launch the tunable laser source of different wave length laser beams；
Impulse generator for laser beam to be formed to laser pulse；
For the image intensifer for being amplified laser pulse；With
For laser pulse progress branch to be formed into the optical branching device of array laser pulse.
3. multi-beam scanning apparatus according to claim 1, it is characterised in that first optical unit includes using successively
In the diversing lens collimated to array laser pulse and the first diffraction grating.
4. multi-beam scanning apparatus according to claim 3, it is characterised in that second optical unit includes the successively
Two diffraction grating and the receiving lens for being collimated to light beam.
5. multi-beam scanning apparatus according to claim 4, it is characterised in that first diffraction grating and the second diffraction
Grating forms entirety.
6. multi-beam scanning apparatus according to claim 2, it is characterised in that the signal receiving unit includes being used to connect
Receive the photodetector of Returning beam, for receiving the signal amplifying and conditioning circuit that signal carries out signal transacting to photodetector.
7. multi-beam scanning apparatus according to claim 6, it is characterised in that the quantity of the tunable laser source is big
In equal to two, the quantity of the photodetector is more than or equal to two, the photodetector and the tunable laser source one
One correspondence.
8. multi-beam scanning apparatus according to claim 1, it is characterised in that the distance analysis unit includes multiple
ADC or multiple compares timer or phase discriminator.
9. multi-beam scanning apparatus according to claim 2, it is characterised in that the multi-beam scanning apparatus also includes one
Calculation control unit, is adjusted for the wavelength to tunable laser source, for the multiplication factor progress to image intensifer
Regulation, for trigger generator, target range to be measured and wavelength are obtained for the distance according to corresponding to different wave length
Relation, the relationship map in conjunction with wavelength and angle go out the relation of target range to be measured and angle.
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| CN201621462118.7U CN206411262U (en) | 2016-12-29 | 2016-12-29 | Multi-beam scanning apparatus |
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| CN201621462118.7U CN206411262U (en) | 2016-12-29 | 2016-12-29 | Multi-beam scanning apparatus |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772315A (en) * | 2016-12-29 | 2017-05-31 | 武汉高思光电科技有限公司 | Multi-beam scanning apparatus and multibeam scanning method |
| CN110071422A (en) * | 2018-01-24 | 2019-07-30 | 三星电子株式会社 | Beam steering arrangements and sensing system including the beam steering arrangements |
| CN110153417A (en) * | 2019-04-30 | 2019-08-23 | 大族激光科技产业集团股份有限公司 | A kind of laser formation equipment |
| CN110161514A (en) * | 2018-11-20 | 2019-08-23 | 腾讯科技（深圳）有限公司 | A kind of laser radar, lidar measurement method and vehicle driving system |
| CN112764050A (en) * | 2019-10-21 | 2021-05-07 | 北京万集科技股份有限公司 | Laser radar measuring method and laser radar system |
| CN113805184A (en) * | 2021-09-14 | 2021-12-17 | 上海星秒光电科技有限公司 | Laser radar detection system |
| CN113820692A (en) * | 2021-09-14 | 2021-12-21 | 上海星秒光电科技有限公司 | Multi-line laser radar |
| JP2022503383A (en) * | 2018-06-07 | 2022-01-12 | バラハ ピーティーワイ リミテッド | Optical beam director |
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2016
- 2016-12-29 CN CN201621462118.7U patent/CN206411262U/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772315A (en) * | 2016-12-29 | 2017-05-31 | 武汉高思光电科技有限公司 | Multi-beam scanning apparatus and multibeam scanning method |
| CN110071422A (en) * | 2018-01-24 | 2019-07-30 | 三星电子株式会社 | Beam steering arrangements and sensing system including the beam steering arrangements |
| CN110071422B (en) * | 2018-01-24 | 2023-09-26 | 三星电子株式会社 | Beam steering device and sensor system comprising same |
| JP2022503383A (en) * | 2018-06-07 | 2022-01-12 | バラハ ピーティーワイ リミテッド | Optical beam director |
| CN110161514A (en) * | 2018-11-20 | 2019-08-23 | 腾讯科技（深圳）有限公司 | A kind of laser radar, lidar measurement method and vehicle driving system |
| CN110153417A (en) * | 2019-04-30 | 2019-08-23 | 大族激光科技产业集团股份有限公司 | A kind of laser formation equipment |
| CN112764050A (en) * | 2019-10-21 | 2021-05-07 | 北京万集科技股份有限公司 | Laser radar measuring method and laser radar system |
| CN112764050B (en) * | 2019-10-21 | 2024-02-23 | 武汉万集光电技术有限公司 | Laser radar measurement method and laser radar system |
| CN113805184A (en) * | 2021-09-14 | 2021-12-17 | 上海星秒光电科技有限公司 | Laser radar detection system |
| CN113820692A (en) * | 2021-09-14 | 2021-12-21 | 上海星秒光电科技有限公司 | Multi-line laser radar |
| CN113820692B (en) * | 2021-09-14 | 2023-08-25 | 上海星秒光电科技有限公司 | Multi-line laser radar |
| CN113805184B (en) * | 2021-09-14 | 2023-08-25 | 上海星秒光电科技有限公司 | Laser radar detection system |
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Effective date of registration: 20190816 Address after: 430000 Workshop A, 2nd Floor, No. 6 Workshop, No. 3 High-tech Third Road, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: Wuhan Ling Road Sensing Technology Co., Ltd. Address before: 430205 No. 403, Guanggu Huijin Center, No. 18, Fourth Road, Finance Port, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee before: Wuhan Gaosi Optoelectronic Technology Co., Ltd. |
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