CN106684694A - Laser beam splitting device used for multi-line laser radar - Google Patents
Laser beam splitting device used for multi-line laser radar Download PDFInfo
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- CN106684694A CN106684694A CN201710085672.0A CN201710085672A CN106684694A CN 106684694 A CN106684694 A CN 106684694A CN 201710085672 A CN201710085672 A CN 201710085672A CN 106684694 A CN106684694 A CN 106684694A
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- laser radar
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- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims description 48
- 238000001514 detection method Methods 0.000 claims description 16
- 239000013307 optical fiber Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000003384 imaging method Methods 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 5
- 238000000691 measurement method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000002366 time-of-flight method Methods 0.000 description 2
- 230000001427 coherent effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/101—Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a beam splitting device used for a multi-line laser radar. The laser beam splitting device comprises a light beam transmitting device and a light beam receiving device, wherein the light beam transmitting device is used for outputting a plurality of equipower laser beams with small divergence angles to a detected object; and the light beam receiving device is used for receiving laser beams reflected by the detected object. The light beam transmitting device comprises a laser device, a beam coupling device, a light splitting device and a light beam collimating device which are connected in sequence. The laser beam splitting device is simple in design and compact in structure, and compared with a multi-line technology adopted in current multi-line laser radar, the production cost of the multi-line laser radar can be effectively reduced.
Description
Technical field
The invention belongs to laser technology and optical field, more particularly to a kind of laser beam splitter dress for multi-line laser radar
Put.
Background technology
Laser radar system combines optical detector technology and distance measurement technique, can obtain simultaneously orientation, pitching, away from
From information such as, intensity, have in fields such as forest structure estimation, urban construction, intelligence manufacture, unmanned, agriculture, Aero-Space
It is widely applied.Laser radar is divided from system, mainly there is direct detection laser radar and coherent detection laser radar.Straight
The laser distance measurement method for connecing acquisition range information in detecting laser radar is broadly divided into laser time of flight method and triangle telemetry,
Wherein laser time of flight method includes laser pulse ranging method and the phase ranging method of intensity modulated is carried out to laser continuous wave.
Triangle measurement method is that the image space by Laser Measurement beam on CCD obtains range information, and its great advantage is
Technical difficulty is low, and cost is also very low, and range accuracy is in hundred micron dimensions in closely finding range.It has the disadvantage that certainty of measurement can be with
The increase of distance is gradually deteriorated, substantially cannot be compared with pulse ranging and phase ranging.Phase-shift laser rangefinder method is mainly led to
Cross to measure and obtained by round trip flight between the radar and detected object phase contrast of generation of the continuous wave laser signal of intensity modulated
Obtain range information.Its maximum advantage is that resolution of ranging is very high, and common phase distance meter can reach millimeter magnitude point
Resolution.But its measuring speed is slower than pulse ranging, and its certainty of measurement is easier to be subject to target shape motion to affect.Laser
Pulse ranging technology by Laser Measurement pulse round trip flight between laser radar and detected object the time obtain object away from
From information.Here using the speed of light as benchmark, its measurement is all based on the flight speed of laser this benchmark, by L=ct/
2, t send the time that pulse is flown in the air that starts to being received by detector from emitter for pulse, can calculate thing
Distance of the body to laser radar.
At present, including the laser radar used of the scene such as automatic Pilot, robot, mapping, laser pulse is substantially belonged to
Ranging technology, and tend to belong to the multi-line laser radar of such as 8 lines, 16 lines, 32 lines and 64 lines.Because its multiwire technology is to pass through
The sub- laser instrument realization of respective numbers, control circuit complicated and relatively costly problem, it is difficult to realize larger with machine volume
Extensive application in above-mentioned scene.And the sub- laser instrument transmitting pulse peak power to be reached single at present is only hectowatt amount
Level, the distance limit that can be detected is in hundred meters of magnitudes, it is difficult to realize more remote target acquisition.
The content of the invention
In order to solve above-mentioned technical problem present in background technology, the invention provides a kind of small volume, low cost can
For the laser beam splitter device of multi-line laser radar.
In order to solve above-mentioned technical problem, following technical scheme is this invention takes.
A kind of beam splitting arrangement for multi-line laser radar, including：Beam launcher and beam reception device, the light
Beam discharger, for exporting the little laser beam of a number of constant power angle of divergence to detected object；The beam reception dress
Put, for receiving the laser beam being reflected back by detected object；
Beam launcher includes：Laser instrument, light beam coupling device, light-dividing device and the beam collimation dress being sequentially connected
Put, wherein, the light beam coupling device is used to for the light beam coupling that variety classes laser instrument is produced to enter light-dividing device, the light splitting
The light beam that device is used to will be coupled into is split, and the beam splitting arrangement combines connection and constitutes by multiple 1*N fiber couplers,
The light beam that will be coupled into by the fiber coupler of the 1*N carries out m beam splitting, is divided into NmThe laser beam of beam constant power, or
Beam splitting arrangement described in person combines connection and constitutes by multiple 1*N fiber couplers and 1*M fiber couplers, by the 1*N and 1*M
The light beam that the fiber coupler combination of different splitting ratios will be coupled into is split, and is divided into the laser of a number of constant power
Beam；The beam collimation device is used to the laser beam of constant power is collimated with the little laser beam of the output beam angle of divergence, its
In, N and M is the positive even numbers not less than 2, and m is positive integer；
Beam reception device includes：The beam condenser being sequentially connected and light detection device, wherein, the light beam is focused on
Device is used for the light beam focal imaging for being reflected back on detected object in light detection device, and the light detection device is used for light
Signal is transformed into the signal of telecommunication.
Preferably, the laser instrument be gas laser, semiconductor laser, solid state laser or optical fiber laser its
In one kind, the centre wavelength scope of laser is 400nm -2100nm.
Preferably, the light beam coupling device is lens group or passive fiber, the lens group is parallel to each other by 2 and is set
The lens composition put.
Preferably, the light-dividing device combines connection by multiple 1*2 fiber couplers constituting or by multiple 1*4 light
Fine bonder and the combination connection of 1*2 fiber couplers are constituted or by multiple 1*8 fiber couplers and 1*4 fiber coupler groups
Close connection composition.
Preferably, the beam collimation device is made up of the optical fiber collimator of multiple equiangularly spaced settings.
Preferably, the beam condenser is made up of single condenser lenses.
Preferably, the light detection device is made up of multiple photodetectors being equidistantly spaced.
The beam splitting arrangement for multi-line laser radar of the present invention, including：Beam launcher and beam reception device, institute
Beam launcher is stated, for exporting the little laser beam of a number of constant power angle of divergence to detected object；The light beam connects
Receiving apparatus, for receiving the laser beam being reflected back by detected object；Wherein, beam launcher includes：What is be sequentially connected swashs
Light device, light beam coupling device, light-dividing device and beam collimation device, wherein, the light beam coupling device is used for variety classes
The light beam coupling that laser instrument is produced enters light-dividing device, and the light beam that the light-dividing device is used to will be coupled into is split, is divided into
The laser beam of a number of constant power；The beam collimation device is used to the laser beam of constant power is collimated with output beam
The little laser beam of the angle of divergence.The present invention is using the beam launcher with light-dividing device, the light beam that can be produced in laser instrument
Be split, be divided into the laser beam of a number of constant power, to solve prior art in due to its multiwire technology be by corresponding
The sub- laser instrument realization of quantity, control circuit complicated and relatively costly problem larger with machine volume.Present invention design letter
Single, compact conformation, compared with the multiwire technology adopted in current multi-line laser radar, can effectively reduce the life of multi-line laser radar
Produce cost.
Description of the drawings
Fig. 1 is the structural representation of the laser beam splitter device for multi-line laser radar provided in an embodiment of the present invention；
Fig. 2 is the structural representation of beam launcher provided in an embodiment of the present invention；
Fig. 3 is the structural representation of beam launcher provided in an embodiment of the present invention；
Fig. 4 is the structural representation of beam launcher provided in an embodiment of the present invention；
Fig. 5 is the structural representation of beam launcher provided in an embodiment of the present invention；
Fig. 6 is the structural representation of beam reception device provided in an embodiment of the present invention.
Wherein, 100, beam launcher, 200, beam reception device, 1, laser instrument, 2, lens group, 3, fiber coupling
Device, 4, optical fiber collimator, 5, passive fiber, 6, convergent lens, 7, photodetector.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is described further, and specific embodiment described herein is only used for explaining the present invention, but does not limit the present invention.
As shown in figure 1, the embodiment of the present invention provides a kind of structure of the laser beam splitter device for multi-line laser radar showing
It is intended to, including：Beam launcher and beam reception device, the beam launcher, if for the output of detected object
The little laser beam of the dry quantity constant power angle of divergence；The beam reception device, for receiving by swashing that detected object is reflected back
Light beam.
Beam launcher includes：Laser instrument, light beam coupling device, light-dividing device and the beam collimation dress being sequentially connected
Put, wherein, the light beam coupling device is used to for the light beam coupling that variety classes laser instrument is produced to enter light-dividing device, the light splitting
The light beam that device is used to will be coupled into is split, and the beam splitting arrangement combines connection and constitutes by multiple 1*N fiber couplers,
The light beam that will be coupled into by the fiber coupler of the 1*N carries out m beam splitting, is divided into NmThe laser beam of beam constant power, or
Beam splitting arrangement described in person combines connection and constitutes by multiple 1*N fiber couplers and 1*M fiber couplers, by the 1*N and 1*M
The light beam that the fiber coupler combination of different splitting ratios will be coupled into is split, and is divided into the laser of a number of constant power
Beam；The beam collimation device is used to the laser beam of constant power is collimated with the little laser beam of the output beam angle of divergence, its
In, N and M is the positive even numbers not less than 2, and m is positive integer；
Beam reception device includes：The beam condenser being sequentially connected and light detection device, wherein, the light beam is focused on
Device is used for the light beam focal imaging for being reflected back on detected object in light detection device, and the light detection device is used for light
Signal is transformed into the signal of telecommunication.
Preferably, the laser instrument be gas laser, semiconductor laser, solid state laser or optical fiber laser its
In one kind, the centre wavelength scope of laser is 400nm -2100nm.
Preferably, the light beam coupling device is lens group or passive fiber, the lens group is parallel to each other by 2 and is set
The lens composition put.
Preferably, the light-dividing device combines connection by multiple 1*2 fiber couplers constituting or by multiple 1*4 light
Fine bonder and the combination connection of 1*2 fiber couplers are constituted or by multiple 1*8 fiber couplers and 1*4 fiber coupler groups
Close connection composition.
Preferably, the beam collimation device is made up of the optical fiber collimator of multiple equiangularly spaced settings.
Preferably, the beam condenser is made up of single condenser lenses.
Preferably, the light detection device is made up of multiple photodetectors being equidistantly spaced.
As a kind of embodiment, as shown in Fig. 2 the beam launcher includes：Laser instrument, the lens being sequentially connected
Group, beam splitting arrangement, multiple optical fiber collimators, the beam splitting arrangement combines connection and constitutes by the fiber coupler of multiple 1*2.Laser
The centre wavelength that device is produced is 532nm, and mean power is coupled in beam splitting arrangement for the laser of 160W by lens group, and is led to
Crossing the light beam that the fiber coupler of multiple 1*2 will be coupled into carries out 4 beam splitting, is divided into the laser beam that 16 beam powers are 10W, this
A little laser beams are exported again by the equiangularly spaced optical fiber collimator 4 put with the beam divergence angle of 0.19mrad.
As a kind of embodiment, as shown in figure 3, the beam launcher includes：Laser instrument, the lens being sequentially connected
Group, beam splitting arrangement, multiple optical fiber collimators, the beam splitting arrangement is the fiber coupler combination connection composition of multiple 1*2.Laser
The centre wavelength that device is produced is 1064nm, and mean power is coupled in laser beam splitter device for the laser of 32W by lens group,
And the light beam that will be coupled into by the fiber coupler of multiple 1*2 carries out 5 beam splitting, it is divided into the laser that 32 beam powers are 1W
Beam, these laser beams are exported again by the equiangularly spaced optical fiber collimator put with the beam divergence angle of 0.56mrad.
As a kind of embodiment, as shown in figure 4, the beam launcher includes：Laser instrument, the passive light being sequentially connected
Fibre, beam splitting arrangement, multiple optical fiber collimators, the light-dividing device is combined by multiple 1*4 fiber couplers and 1*2 fiber couplers
Connection composition.The centre wavelength that laser instrument is produced is 1550nm, and mean power is 16W, and pulsewidth is 2ns, and pulse recurrence frequency is
The laser of 100KHz is coupled in beam splitting arrangement by passive fiber, will be coupled into by 1*4 fiber couplers for the first time
Light beam is divided into the laser beam that 4 beam powers are 4W, and second laser beam by 1*2 fiber couplers by 4 beam powers for 2W divides
It is the laser beam of 2W into 8 beam powers, for the third time the laser beam that 8 beam powers are 2W is divided into by 16 beam work(by 1*2 fiber couplers
Rate is the laser beam of 1W, and corresponding peak value is 5KW, and detectable distance is in km magnitude.Between these laser beams pass through angularly again
Exported with the beam divergence angle of 0.56mrad every the optical fiber collimator put.
As a kind of embodiment, as shown in figure 5, the beam launcher includes：Laser instrument, the beam splitting dress being sequentially connected
Put, multiple optical fiber collimators, the beam splitting arrangement 3 is that 1 1*8 fiber coupler and 8 1*4 fiber couplers combine connection groups
Into.The centre wavelength that laser instrument is produced is 1550nm, and mean power is coupled into laser beam splitter for the laser of 32W by lens group
In device, the light beam that will be coupled into by 1*8 fiber couplers for the first time is divided into the laser beam that 8 beam powers are 4W, for the second time
8 beam powers are divided into by the laser beam that 32 beam powers are 1W for the laser beam of 4W by 1*4 fiber couplers, the laser beam leads to again
Cross the equiangularly spaced optical fiber collimator put and exported with the beam divergence angle of 0.56mrad.
As shown in fig. 6, the structural representation of beam reception device provided in an embodiment of the present invention, detected object is reflected back
Light beam by condenser lenses focal imaging on the light detection device that photodetector is equidistantly spaced, the optical detection
Device is used to convert optical signals into the signal of telecommunication.
Present invention design is simple, compact conformation, for can effectively reduce production cost in multi-line laser radar, improves object
Detectable distance, is with a wide range of applications.
Claims (7)
1. a kind of beam splitting arrangement for multi-line laser radar, it is characterised in that include：Beam launcher and beam reception are filled
Put, the beam launcher, for exporting the little laser beam of a number of constant power angle of divergence to detected object；The light
Beam reception device, for receiving the laser beam being reflected back by detected object；
Beam launcher includes：Laser instrument, light beam coupling device, light-dividing device and the beam collimation device being sequentially connected, its
In, the light beam coupling device is used to for the light beam coupling that variety classes laser instrument is produced to enter light-dividing device, the light-dividing device
It is split for will be coupled into the light beam for coming, the beam splitting arrangement combines connection and constitutes by multiple 1*N fiber couplers, passes through
The light beam that the fiber coupler of the 1*N will be coupled into carries out m beam splitting, is divided into NmThe laser beam of beam constant power, Huo Zhesuo
State beam splitting arrangement and combine connection by multiple 1*N fiber couplers and 1*M fiber couplers and constitute, it is different with 1*M by the 1*N
The light beam that the fiber coupler combination of splitting ratio will be coupled into is split, and is divided into the laser beam of a number of constant power；Institute
Beam collimation device is stated for the laser beam of constant power to be collimated with the little laser beam of the output beam angle of divergence, wherein, N and
M is the positive even numbers not less than 2, and m is positive integer；
Beam reception device includes：The beam condenser being sequentially connected and light detection device, wherein, the beam condenser
For the light beam focal imaging that is reflected back on detected object in light detection device, the light detection device is used for optical signal
It is transformed into the signal of telecommunication.
2. the beam splitting arrangement of multi-line laser radar is used for as claimed in claim 1, it is characterised in that the laser instrument is gas
Laser instrument, semiconductor laser, solid state laser or optical fiber laser one kind therein, the centre wavelength scope of laser is
400nm—2100nm。
3. the beam splitting arrangement of multi-line laser radar is used for as claimed in claim 1, it is characterised in that the light beam coupling device
For lens group or passive fiber, the lens group is made up of 2 lens arranged in parallel.
4. the beam splitting arrangement of multi-line laser radar is used for as claimed in claim 1, it is characterised in that the light-dividing device is by more
Individual 1*2 fiber couplers combination connection is constituted or combines connection group by multiple 1*4 fiber couplers and 1*2 fiber couplers
Into or combine connection by multiple 1*8 fiber couplers and 1*4 fiber couplers and constitute.
5. the beam splitting arrangement of multi-line laser radar is used for as claimed in claim 1, it is characterised in that the beam collimation device
It is made up of the optical fiber collimator of multiple equiangularly spaced settings.
6. the beam splitting arrangement of multi-line laser radar is used for as claimed in claim 1, it is characterised in that the beam condenser
It is made up of single condenser lenses.
7. the as claimed in claim 1 beam splitting arrangement for being used for multi-line laser radar, it is characterised in that the light detection device by
Multiple photodetector compositions being equidistantly spaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710085672.0A CN106684694A (en) | 2017-02-17 | 2017-02-17 | Laser beam splitting device used for multi-line laser radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710085672.0A CN106684694A (en) | 2017-02-17 | 2017-02-17 | Laser beam splitting device used for multi-line laser radar |
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| Publication Number | Publication Date |
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| CN106684694A true CN106684694A (en) | 2017-05-17 |
Family
ID=58862398
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| CN201710085672.0A Pending CN106684694A (en) | 2017-02-17 | 2017-02-17 | Laser beam splitting device used for multi-line laser radar |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226945A (en) * | 2018-01-15 | 2018-06-29 | 上海禾赛光电科技有限公司 | Laser radar and its method of work |
| WO2019136854A1 (en) * | 2018-01-15 | 2019-07-18 | 上海禾赛光电科技有限公司 | Laser radar and operation method therefor |
| US10473767B2 (en) | 2017-06-19 | 2019-11-12 | Hesai Photonics Technology Co., Ltd. | Lidar system and method |
| CN111308441A (en) * | 2018-12-12 | 2020-06-19 | 宁波舜宇车载光学技术有限公司 | Laser radar transmitting device and assembling method |
| CN111766587A (en) * | 2020-06-11 | 2020-10-13 | 苏州玖物互通智能科技有限公司 | Multi-line laser radar optical system |
| WO2024045550A1 (en) * | 2022-08-29 | 2024-03-07 | 上海禾赛科技有限公司 | Laser radar transmitting module, transceiver device and laser radar |
| US12019187B2 (en) | 2017-06-19 | 2024-06-25 | Hesai Technology Co., Ltd. | Lidar system and method |
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| CN105785343A (en) * | 2016-04-29 | 2016-07-20 | 中国科学院电子学研究所 | Spacial multi-beam laser emitter, multichannel receiving apparatus and detection apparatus |
| CN206461219U (en) * | 2017-02-17 | 2017-09-01 | 北京工业大学 | A kind of laser beam splitter device for multi-line laser radar |
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| JP2001166261A (en) * | 1999-12-07 | 2001-06-22 | Communications Research Laboratory Mphpt | Optical correlator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10473767B2 (en) | 2017-06-19 | 2019-11-12 | Hesai Photonics Technology Co., Ltd. | Lidar system and method |
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| US12019187B2 (en) | 2017-06-19 | 2024-06-25 | Hesai Technology Co., Ltd. | Lidar system and method |
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| CN111308441A (en) * | 2018-12-12 | 2020-06-19 | 宁波舜宇车载光学技术有限公司 | Laser radar transmitting device and assembling method |
| CN111766587A (en) * | 2020-06-11 | 2020-10-13 | 苏州玖物互通智能科技有限公司 | Multi-line laser radar optical system |
| WO2024045550A1 (en) * | 2022-08-29 | 2024-03-07 | 上海禾赛科技有限公司 | Laser radar transmitting module, transceiver device and laser radar |
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