CN217112701U

CN217112701U - Laser radar

Info

Publication number: CN217112701U
Application number: CN202123176682.6U
Authority: CN
Inventors: 程刚; 王爽; 赵胜强; 徐文东; 何跃
Original assignee: Wuhan Tianmou Photoelectric Technology Co ltd
Current assignee: Wuhan Tianmou Photoelectric Technology Co ltd
Priority date: 2021-12-16
Filing date: 2021-12-16
Publication date: 2022-08-02
Anticipated expiration: 2031-12-16

Abstract

The utility model discloses a laser radar, including installation base, transmission and receiving assembly, the installation base is equipped with transmission and receiving area, transmission and receiving assembly locate transmission and receiving area respectively, the transmission assembly includes a plurality of semiconductor laser and a plurality of little plastic lens that have the transmitting terminal that the one-to-one set up for towards target object transmission multi-beam laser, little plastic lens all couples in the transmitting terminal that corresponds, is used for integrating the multi-beam laser that the transmitting terminal sent; the receiving assembly comprises a plurality of photoelectric detectors with receiving ends and optical filters, the photoelectric detectors are arranged in one-to-one correspondence with the semiconductor lasers and are used for receiving the multiple beams of laser light reflected by the target, and the optical filters are arranged to cover the receiving ends and are used for filtering stray light in the multiple beams of laser light received by the receiving ends. The utility model discloses a little plastic lens and light filter act together and have guaranteed laser radar's stronger optical property.

Description

Laser radar

Technical Field

The utility model relates to a radar technical field, in particular to laser radar.

Background

In the current laser radar market, the laser with weak interference immunity optical performance has obvious shortcomings in safety performance, the laser with strong interference immunity optical performance has certain obstruction in the aspect of integration, miniaturization and microminiaturization cannot be achieved, and the manufacturing cost is relatively high.

The laser radars currently on the market are mainly based on two lasers, one is a 905nm semiconductor laser and the other is a 1550nm fiber laser, according to the types of the lasers. According to relevant market research, the most widely used of these two lasers is the 905nm laser. From the optical performance of the light source, the 905nm laser has weak anti-interference capability and relatively short detection distance, and has obvious insufficient penetration capability to rain fog in practical use. In view of safety performance, the 905nm laser has one of the most important disadvantages, that is, the 905nm laser has not little hidden trouble in human eye safety, and particularly, when the working distance reaches more than 150m, the optical power of the 905nm laser exceeds the safety threshold of human eyes, and the human eyes can be hardly aware of the hidden trouble to damage the retina to some extent.

And 1550 nm's fiber laser's optical property is better than 905 nm's laser instrument relatively, and 1550 nm's fiber laser interference immunity is better, has bigger advantage under the rain and fog weather, and is littleer to the harmfulness of people's eye, and can integrate through the silicon platform. However, when the 1550nm fiber laser is applied to a laser radar, the size of the laser radar is too large because the corresponding integrated module cannot have a large size, and the current vehicle-scale requirement on the market cannot be met. And 1550nm fiber laser for 905nm laser, the former power at the during operation is higher, and power consumption is more under the same time, and it can be more serious to generate heat, needs the more design of radiating part of being partial of whole overall layout of radar, occupies with many spaces. Secondly, the 1550nm fiber laser cannot break through in some corresponding technical fields, so that the overall price of the 1550nm fiber laser is higher. When applied to a laser radar, the cost for manufacturing the laser radar is also high.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a laser radar aims at solving and accomplishes laser radar's miniaturization under the prerequisite of guaranteeing optical property.

In order to achieve the above object, the utility model provides a laser radar, include: the mounting base is provided with a transmitting area and a receiving area;

the emission assembly is arranged in the emission area and comprises a plurality of semiconductor lasers and a plurality of micro shaping lenses, the semiconductor lasers are correspondingly arranged in a one-to-one mode, the semiconductor lasers are distributed at intervals along the length direction of the emission area, each semiconductor laser is provided with an emission end, the emission end is used for emitting a plurality of beams of laser towards a target, and each micro shaping lens is coupled to the emission end of the corresponding semiconductor laser and used for integrating the plurality of beams of laser emitted by the emission end; and the number of the first and second groups,

the receiving assembly is installed in the receiving area and comprises a plurality of photoelectric detectors and optical filters, the photoelectric detectors are in one-to-one correspondence with the semiconductor lasers, each photoelectric detector is provided with a receiving end, the receiving ends are used for receiving a plurality of laser beams reflected back from a target object and emitted from the emitting ends, and the optical filters cover the receiving ends of the photoelectric detectors and are used for filtering stray light in the laser beams received by the receiving ends.

Optionally, a mounting plate is arranged on the mounting base, the mounting plate includes a first portion rotatably arranged in the transmitting area and a second portion rotatably arranged in the receiving area, the transmitting assembly is arranged on the first portion, and the receiving assembly is arranged on the second portion;

the first portion with the second part all includes stiff end and rotation end, the stiff end of first portion with the stiff end of second part is close to each other, the rotation end of first portion is followed and is kept away from gradually the direction of installation base is rotated in order to adjust emission subassembly with angle between the installation base, the rotation end of second part is followed and is kept away from gradually the direction of installation base is rotated in order to adjust receive the subassembly with angle between the installation base.

Optionally, the laser radar further includes a mirror group, where the mirror group includes a first mirror, a second mirror, and an adjusting mirror, which are sequentially disposed, and after receiving the light, one of the first mirror and the second mirror reflects the light to the other of the first mirror and the second mirror to change a path of the light, and the adjusting mirror includes a first side and a second side, and is configured to amplify the light passing through the first side to the second side and integrate and reduce the light passing through the second side to the first side; the first side of the adjusting reflector is arranged close to the second reflector;

the reflector group is arranged close to the emission end, the first reflector of the reflector group is close to the emission end, and the second side of the adjusting reflector is far away from the emission end; and/or the presence of a gas in the gas,

the reflector group is arranged close to the receiving end, the first reflector of the reflector group is close to the receiving end, and the second side of the adjusting reflector is far away from the receiving end.

Optionally, the first reflector and the second reflector are both provided with a reflective film, and the lens of the adjusting reflector is provided with an antireflection film.

Optionally, the adjusting reflector includes a lens barrel, and a first convex lens, a concave lens, and a second convex lens that are sequentially disposed at intervals along an axial direction of the lens barrel in the lens barrel.

Optionally, the convex surfaces of the first convex lens and the second convex lens are both deviated from the concave lens arrangement, the convex surface of the first convex lens forms the first side, and the convex surface of the second convex lens forms the second side.

Optionally, the micro-shaping lens includes a lens body made of a bare fiber, and an antireflection film is coated on an outer surface of the bare fiber.

Optionally, still include in the receiving area along keeping away from the direction of speculum group interval sets up in proper order receiving panel, conversion circuit board and amplifier circuit board, the receiving panel conversion circuit board and electric connection between the amplifier circuit board, a plurality of photoelectric detector locate on the receiving panel for convert received optical signal into current signal and transmit for the conversion circuit board, the conversion circuit board be used for with current signal conversion to voltage signal on the receiving panel, amplifier circuit board is used for enlargiing the voltage signal who gathers.

Optionally, the laser radar further includes a driving circuit, where the driving circuit includes a plurality of transmission driving circuits and a plurality of reception driving circuits, each of the transmission driving circuits drives one of the semiconductor lasers, and each of the reception driving circuits drives one of the photodetectors.

Optionally, a light-blocking structure is disposed between the emitting assembly and the receiving assembly.

The utility model discloses among the technical scheme, through a plurality of semiconductor laser's transmitting terminal one-to-one is provided with little plastic lens, the effect of this lens is integrated the light that a plurality of semiconductor laser sent makes the optical effect of the light beam that a plurality of semiconductor laser sent is stronger, can adapt to more abominable environment, corresponds the photoelectric detector of a plurality of semiconductor laser one-to-one settings, each photoelectric detector's front end all cladding has the light filter, the light filter is used for filtering the ambient light in the laser of reflection back, guarantees received laser intensity. The micro-shaping lens and the optical filter act together to ensure the stronger optical performance of the laser radar. Meanwhile, the laser device is made of semiconductor materials, so that the plurality of semiconductor laser devices can be integrated, and the miniaturization of the laser radar is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is an overall schematic diagram of a laser radar provided by the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

fig. 3 is a partially enlarged view of B in fig. 1.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				1	Mounting base	311	Receiving end
1a	Mounting plate	4	Reflector group
				11	Emission area	41	First reflector
11a	The first part	42	Second reflecting mirror
				12	Receiving area	43	Adjustable reflector
12a	The second part	431	First convex lens
				2	Transmitting assembly	432	Concave lens
21	1550nm semiconductor laser	433	Second convex lens
				211	Transmitting terminal	5	Driving circuit
22	Micro-shaping lens	51	Emission driving circuit
				22a	Bare optical fiber	52	Receiving drive circuit
3	Receiving assembly	6	Light-blocking structure
				31	1550nm photoelectric detector

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

In the current laser radar market, the laser with weak interference immunity optical performance has obvious shortcomings in safety performance, the laser with strong interference immunity optical performance has certain obstruction in the aspect of integration, miniaturization and microminiaturization cannot be achieved, and the manufacturing cost is relatively high. In view of this, the utility model provides a laser radar aims at solving and accomplishes laser radar's miniaturization under the prerequisite of guaranteeing optical property.

Please refer to fig. 1 to fig. 3, which illustrate an embodiment of a laser radar according to the present invention.

Referring to fig. 1 to 3, a laser radar includes a mounting base 1, a transmitting module 2, and a receiving module 3, where the mounting base 1 is provided with a transmitting area 11 and a receiving area 12; the emission component 2 is installed in the emission region 11, the emission component 2 includes a plurality of semiconductor lasers and a plurality of micro shaping lenses 22, the semiconductor lasers are correspondingly arranged in one-to-one correspondence, the semiconductor lasers are arranged at intervals along the length direction of the emission region 11, each semiconductor laser has an emission end 211, the emission end 211 is used for emitting a plurality of laser beams towards a target, and each micro shaping lens 22 is coupled to the emission end 211 of the corresponding semiconductor laser and is used for integrating the plurality of laser beams emitted by the emission end 211; the receiving assembly 3 is installed in the receiving area 12, the receiving assembly 3 includes a plurality of photodetectors and optical filters, which are arranged in one-to-one correspondence with the plurality of semiconductor lasers, each of the photodetectors has a receiving end 311, the receiving end 311 is configured to receive a plurality of laser beams reflected from the emitting end 211 to a target, and the optical filters are arranged to cover the receiving ends 311 of the photodetectors, so as to filter stray light in the plurality of laser beams received by the receiving ends 311.

In this embodiment, the semiconductor laser is 1550nm semiconductor laser 21, the photoelectric detector is 1550nm photoelectric detector 31, specifically can be indium gallium arsenide (InGaAs) near infrared detector, through be provided with the emission end 211 one-to-one of a plurality of 1550nm semiconductor laser 21 micro-shaping lens 22, the effect of this lens is the integration the light that a plurality of 1550nm semiconductor laser 21 sent, make the optical effect of the light beam that a plurality of 1550nm semiconductor laser 21 sent is stronger, can correspond more in the rugged environment ground, correspond the 1550nm photoelectric detector 31 that a plurality of 1550nm semiconductor laser 21 set up one-to-one, and be a plurality of 1550nm cladding has photoelectric detector 31's front end the light filter, the light filter is used for filtering the ambient light in the laser that reflects back, guarantees received laser intensity. The micro-shaping lens 22 and the optical filter work together to ensure strong optical performance of the laser radar. Wherein, little plastic lens 22 laser is used for carrying out the fast axle compression to the laser beam through plastic microlens, and the light of being convenient for concentrates, the light filter need use 1550 nm's narrowband optical filter for reduce the interference of ambient light to laser radar the utility model discloses in, the light filter can be a whole integrated light filter also can be a plurality of one-to-one 1550nm photoelectric detector 31's a plurality of light filters, do not do the restriction here. The optical filter is coated on the front end of the photoelectric detector in a viscose mode to play an effective sealing role for the photoelectric detector, so that the optical filtering effect is better.

As is well known, the laser radar trade has especially proposed very high requirement in the aspect of the volume to whole laser radar's performance at present, can't integrate and directly lead to the inside occupation space of laser radar can the grow, the corresponding grow of volume to make the structure become complicated, the reliability can reduce greatly, can't pass partial environmental test. Meanwhile, the laser device is made of a semiconductor material, so that the plurality of 1550nm semiconductor laser devices 21 can be integrated, and miniaturization of the laser radar is guaranteed. The 1550nm semiconductor laser 21 used in this embodiment can well solve the defect that lasers with other wavelengths or 1550nm fiber lasers and the like cannot be integrated. In this embodiment, the plurality of 1550nm semiconductor lasers 21 are bare chips in the emitting region 11, and are not packaged, so that multiple paths of the 1550nm semiconductor lasers 21 can be integrated into one laser, and the size is smaller.

Further, referring to fig. 1, a mounting plate 1a is disposed on the mounting base 1, the mounting plate 1a includes a first portion 11a rotatably disposed in the transmitting region 11 and a second portion 12a rotatably disposed in the receiving region 12, the transmitting assembly 2 is disposed on the first portion 11a, and the receiving assembly 3 is disposed on the second portion 12 a; first portion 11a with second portion 12a all includes stiff end and rotation end, first portion 11 a's stiff end with second portion 12 a's stiff end is close to each other, first portion 11 a's rotation end is followed and is kept away from gradually the direction of installation base is rotated in order to adjust emission subassembly 2 with angle between the installation base 1, second portion 12 a's rotation end is followed and is kept away from gradually the direction of installation base is rotated in order to adjust receive subassembly 3 with angle between the installation base 1.

In this embodiment, the first portion 11a and the second portion 12a of the mounting board 1a are used to ensure that the emitting component 2 and the receiving component 3 form a certain included angle with the mounting base 1, and the first portion 11a and the second portion 12a are respectively adjustable so that the light emitting position of the semiconductor laser and the photosensitive position of the photodetector are respectively located at focal plane positions of the laser emitting optical system and the laser receiving optical system. In this embodiment, the angle between the first portion 11a and the second portion 12a and the mounting base is adjustable by providing a mounting bracket, and the specific form of the mounting bracket is not limited herein.

Referring to fig. 1, the lidar further includes a reflector set 4, the reflector set 4 includes a first reflector 41, a second reflector 42 and an adjusting reflector 43 sequentially arranged, one of the first reflector 41 and the second reflector 42 reflects the light to the other one after receiving the light, so as to change the path of the light, the adjusting reflector 43 includes a first side and a second side, and is configured to magnify the light passing through the first side to the second side and integrate and reduce the light passing through the second side to the first side; a first side of the adjustment mirror 43 is arranged close to the second mirror 42; the reflector group 4 is disposed close to the emission end 211, the first reflector 41 of the reflector group 4 is close to the emission end 211, and the second side of the adjusting reflector 43 is far from the emission end 211; and/or the mirror group 4 is disposed close to the receiving end 311, the first mirror 41 of the mirror group 4 is close to the receiving end 311, and the second side of the adjusting mirror 43 is far from the receiving end 311.

In this embodiment, the setting angles of the first reflecting mirror 41 and the second reflecting mirror 42 can be freely adjusted, so that the emitted laser or the received laser is refracted for multiple times to rearrange the optical path, the spatial layout is fully utilized, and the application on the mechanical radar is more suitable. The reflecting mirror group 4 may be disposed only near the emitting end 211, and configured to diffuse the emitted laser light according to a predetermined path, so that the light beam can adapt to more extreme weather or environments, or the reflecting mirror group 4 may be disposed only near the receiving end 311, and configured to concentrate the reflected laser light, so that the laser light received by the receiving end 311 is more concentrated. In a preferred embodiment, two groups of the reflecting mirror groups 4 are respectively disposed near the receiving end 311 and the transmitting end 211, so that the emitted laser has stronger penetrating power, and the received laser is stronger, so that the performance of the radar is better.

Specifically, the first reflector 41 and the second reflector 42 are both provided with a reflective film, and the lens of the adjusting reflector 43 is provided with an antireflection film.

In this embodiment, the reflective film is a 1550nm reflective film, and the anti-reflection film is a 1550nm anti-reflection film, which is used to increase the light intensity of the transmitted laser. The 1550nm reflection film may be disposed on any one surface of the first reflection mirror 41 and the second reflection mirror 42, or may cover the whole of the first reflection mirror 41 and the second reflection mirror 42, and the 1550nm antireflection film is adjusted and disposed on any one surface of the mirror of the lifting mirror 43, or may cover the whole of the mirror of the adjusting mirror 43, which is not limited herein.

Further, the adjustment mirror 43 includes a lens barrel, and a first convex lens 431, a concave lens 432, and a second convex lens 433 that are sequentially disposed at intervals in an axial direction of the lens barrel in the lens barrel.

In this embodiment, the first convex lens 431 selects a thick convex lens for condensing the received laser light, the concave lens 432 is used for diverging the received light, and the second convex lens 433 adopts a thin convex lens for diverging the light passing through the second convex lens 433. In the present invention, the specific form of the adjustment mirror 43 is not limited, and it may be a complete lens having the function of the adjustment mirror 43.

Specifically, the convex surfaces of the first convex lens 431 and the second convex lens 433 are both deviated from the concave lens 432, the convex surface of the first convex lens 431 forms the first side, and the convex surface of the second convex lens 433 forms the second side.

In this embodiment, the first convex lens 431 and the second convex lens 433 are both convex lenses with only one convex surface.

Referring to fig. 2, the micro-shaping lens includes a lens body made of a bare fiber 22a, and an antireflection film is coated on an outer surface of the bare fiber 22 a.

In this embodiment, the bare fiber 22a is an optical fiber without a thin layer, the surface of the bare fiber 22a is plated with a 1550nm antireflection film for integrating the light emitted by the 1550nm semiconductor laser, and the bare fiber 22a is perpendicular to the 1550nm semiconductor laser for integrating the light emitted by the 1550nm semiconductor laser.

Further, still include in the receiving area 12 along keeping away from receiving panel, conversion circuit board and the enlarged circuit board that the direction of speculum group 4 interval set up in proper order, the receiving panel conversion circuit board and electric connection between the enlarged circuit board, a plurality of photoelectric detector locate on the receiving panel for convert received optical signal into current signal and transmit for the conversion circuit board, the conversion circuit board be used for with current signal conversion to voltage signal on the receiving panel, enlarged circuit board is used for enlargiing the voltage signal who gathers.

In this embodiment, in order to convert the received optical signal into an electrical signal, which is convenient for the lidar to operate, the plurality of 1550nm photodetectors may be integrated on the receiving board for receiving laser light, the conversion circuit board includes a TIA circuit board for converting a current signal on the receiving board into a voltage signal, and the amplification circuit board is used for amplifying the voltage signal, so as to facilitate subsequent processing.

Referring to fig. 2 to fig. 3, the lidar further includes a driving circuit 5, where the driving circuit 5 includes a plurality of transmitting driving circuits 51 and a plurality of receiving driving circuits 52, each of the transmitting driving circuits 51 drives one of the semiconductor lasers, and each of the receiving driving circuits 52 drives one of the photodetectors.

In this embodiment, each emission drive circuit 51 and each receive drive circuit 52 is to one respectively 1550nm semiconductor laser 21 and one 1550nm photoelectric detector 31 drives, is convenient for drive respectively like this, can adapt to more drive conditions according to actual conditions, in the utility model discloses in, also can be that a whole emission drive circuit 51 drives a plurality of 1550nm semiconductor laser 21, also can be that a whole receive drive circuit 52 drives a plurality of 1550nm photoelectric detector 31.

Referring to fig. 1, a light-blocking structure 6 is disposed between the emitting element 2 and the receiving element 3.

In this embodiment, a light-blocking structure 6 is disposed between the emitting component 2 and the receiving component 3 to prevent light transmission between the emitting component 2 and the receiving component 3, and the light-blocking structure 6 may be a light-blocking plate or a light-blocking sheet, which is not limited herein.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. A lidar, comprising:

the mounting base is provided with a transmitting area and a receiving area;

2. The lidar of claim 1, wherein a mounting plate is provided on the mounting base, the mounting plate including a first portion rotatably disposed in the transmitting region and a second portion rotatably disposed in the receiving region, the transmitting assembly being provided on the first portion and the receiving assembly being provided on the second portion;

3. The lidar of claim 1, further comprising a set of mirrors including a first mirror, a second mirror, and an adjustment mirror disposed in sequence, one of the first mirror and the second mirror reflecting light to the other to change the path of the light after receiving the light, the adjustment mirror including a first side and a second side for magnifying the light passing from the first side to the second side and for integrally reducing the light passing from the second side to the first side; the first side of the adjusting reflector is arranged close to the second reflector;

the reflector group is arranged close to the emission end, the first reflector of the reflector group is close to the emission end, and the second side of the adjusting reflector is far away from the emission end; and/or the presence of a gas in the atmosphere,

4. The lidar of claim 3, wherein the first reflector and the second reflector are each provided with a reflective film, and wherein the adjusting reflector is provided with an anti-reflective film on a mirror.

5. The lidar of claim 3, wherein the adjustment mirror comprises a lens barrel, and a first convex lens, a concave lens, and a second convex lens that are sequentially disposed at intervals in an axial direction of the lens barrel in the lens barrel.

6. The lidar of claim 5, wherein the convex surfaces of the first and second convex lenses are each disposed away from the concave lens, the convex surface of the first convex lens forming the first side and the convex surface of the second convex lens forming the second side.

7. The lidar of claim 2, wherein the micro-shaping lens comprises a lens body made of a bare fiber having an anti-reflection film coated on an outer surface thereof.

8. The lidar of claim 3, further comprising a receiving board, a converting circuit board and an amplifying circuit board disposed at intervals in the receiving area in sequence along a direction away from the reflector group, wherein the receiving board, the converting circuit board and the amplifying circuit board are electrically connected to each other, the plurality of photodetectors are disposed on the receiving board for converting the received optical signal into a current signal and transmitting the current signal to the converting circuit board, the converting circuit board is configured to convert the current signal on the receiving board into a voltage signal, and the amplifying circuit board is configured to amplify the collected voltage signal.

9. The lidar of claim 1, further comprising a drive circuit comprising a plurality of transmit drive circuits each driving one of the semiconductor lasers and a plurality of receive drive circuits each driving one of the photodetectors.

10. The lidar of claim 1, wherein a light blocking structure is disposed between the transmitting assembly and the receiving assembly.