CN210347924U - Laser emission module and laser radar device - Google Patents
Laser emission module and laser radar device Download PDFInfo
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- CN210347924U CN210347924U CN201920655396.1U CN201920655396U CN210347924U CN 210347924 U CN210347924 U CN 210347924U CN 201920655396 U CN201920655396 U CN 201920655396U CN 210347924 U CN210347924 U CN 210347924U
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Abstract
The utility model is suitable for an optics technical field provides a laser emission module and laser radar device, and this laser emission module includes laser unit, lens unit and beam adjustment unit, and lens unit and beam adjustment unit locate on laser unit's light-emitting path; the laser unit is used for generating and emitting laser beams, the lens unit is used for adjusting the propagation path of the laser beams, and the beam adjusting unit is used for reducing the emitting area of the laser beams so that the emitting area of the laser beams is further reduced after passing through the beam adjusting unit; the utility model discloses in, through set up light beam adjustment unit in laser emission module, when laser beam was through this light beam adjustment unit, laser beam's transmitting surface can reduce, can effectively reduce the size of throwing the facula to increase laser beam's transmission optical path, and then help increasing laser radar device's detection distance.
Description
Technical Field
The utility model relates to the field of optical technology, especially, relate to a laser emission module and laser radar device.
Background
The laser radar is a radar system which emits a laser beam to detect information such as the position and speed of an object to be measured. The laser radar transmits a laser beam to the body to be detected, then compares the received signal reflected from the body to be detected with the transmitted signal, and after proper processing, can obtain relevant information of the body to be detected, such as parameters of distance, direction, height, speed, attitude, even shape and the like, thereby detecting, tracking and identifying the body to be detected. The laser radar has the characteristics of long detection distance, high resolution, small environmental interference and the like, so that the laser radar is widely applied to the technical fields of intelligent robots, unmanned aerial vehicles, unmanned driving and the like.
The detection distance of the laser radar is directly related to the emission optical path of the laser, however, the detection distance of the laser radar is limited by the emission optical path of the laser radar at present, so that long-distance detection cannot be carried out.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a laser emission module to solve the technical problem that current laser radar can't carry out long distance detection.
An embodiment of the utility model provides a laser emission module, include:
a laser unit for generating and emitting a laser beam;
the lens unit is arranged on a light emitting path of the laser unit and used for adjusting a propagation path of the laser beam; and the number of the first and second groups,
and the light beam adjusting unit is arranged on the light emitting path of the lens unit and used for reducing the emitting area of the laser beam.
In one embodiment, the beam modification unit comprises a light cone; the light cone is provided with a first end face and a second end face, and the area of the first end face is larger than that of the second end face;
the first end face faces the lens unit and is used for allowing the laser beams to enter, and the second end face is used for allowing the laser beams to exit.
In one embodiment, the light cone includes a cone body and a reflective layer, two ends of the cone body are the first end face and the second end face respectively, and the reflective layer covers an outer surface of the cone body.
In one embodiment, the refractive index of the taper is greater than the refractive index of the reflective layer.
In one embodiment, the light cone comprises a cone and a plurality of tapered optical fibers;
the two ends of the cone are the first end surface and the second end surface respectively;
the tapered optical fibers are arranged in the taper body, and the cross sectional area of one end, facing the first end face, of each tapered optical fiber is larger than that of one end, facing the second end face, of each tapered optical fiber.
In one embodiment, the tapered optical fiber comprises a cladding layer and a core layer;
the diameter of the core layer is gradually reduced from one end facing the first end face to one end facing the second end face along the axial direction of the core layer;
the cladding layer is coated on the outer surface of the core layer.
In one embodiment, the ratio of the diameter of the cladding to the diameter of the core at any cross-section in the tapered fiber is the same.
In one embodiment, the diameter of the first end face is greater than 0.2 millimeters and the diameter of the second end face is less than 0.01 millimeters.
In one embodiment, the laser unit comprises at least one laser, each of which is a ruby laser, a he — ne laser, or a laser diode;
and/or the presence of a gas in the gas,
the lens unit is including locating first lens and second lens on the laser unit light-emitting path, first lens are used for right laser beam carries out the collimation, the second lens is used for right laser beam focuses on.
An object of an embodiment of the present invention is to provide a laser radar apparatus, which includes a laser receiving module, a control module, and the above laser emitting module;
the laser emitting module and the laser receiving module are electrically connected with the control module.
The embodiment of the utility model provides a laser emission module and laser radar device's beneficial effect includes at least below: this laser emission module is through setting up the light beam adjustment unit in laser emission module, and when laser beam passed through this light beam adjustment unit, laser beam's transmitting surface can reduce, can effectively reduce the size of throwing the facula to increase laser beam's transmission optical path, and then help increasing laser radar device's detection distance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a laser emission module provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first structure of a beam adjusting unit of the laser transmitter module of FIG. 1;
FIG. 3 is a second structural diagram of a beam adjustment unit of the laser transmitter module shown in FIG. 1;
FIG. 4 is a schematic view of a tapered optical fiber of the beam adjusting unit of FIG. 3;
fig. 5 is a schematic structural diagram of a laser radar apparatus according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Referring to fig. 1, the present embodiment provides a laser emitting module 10, which includes a laser unit 11, a lens unit 12 and a beam adjusting unit 13, wherein the lens unit 12 and the beam adjusting unit 13 are disposed on an outgoing light path of the laser unit 11. Wherein, the laser unit 11 is used for generating and emitting a laser beam 101; the lens unit 12 is used to adjust the propagation path of the laser beam 101 so that the emission area of the laser beam 101 becomes small after passing through the lens unit 12; the beam adjustment unit 13 is configured to reduce the emission area of the laser beam 101 so that the emission area of the laser beam 101 becomes smaller after passing through the beam adjustment unit 13.
In one embodiment, laser emitting module 10 may be used to provide laser beam 101 in laser radar apparatus 100. Since the detection distance of the laser radar apparatus 100 is directly related to the emission optical path of the laser emission module 10, and the emission optical path is limited by the emission surface of the laser beam 101, the smaller the emission surface of the laser beam 101 is, the larger the emission optical path of the laser beam 101 is. Therefore, by providing the beam adjustment unit 13, when the laser beam 101 passes through the beam adjustment unit 13, the emitting surface of the laser beam 101 is reduced, so that the emitting optical path of the laser beam 101 can be effectively increased, which is helpful for increasing the detection distance of the laser radar apparatus 100.
It should be understood that lidar apparatus 100 may include other modules, not listed here. Of course, in other embodiments, the laser emitting module 10 may be used in other apparatuses, and is not limited to the above-mentioned lidar, and is not limited herein.
In one embodiment, the laser unit 11 includes at least one laser, and the number and type of the lasers can be set according to the requirement, for example, the laser can be a ruby laser, a he-ne laser, or a laser diode, and the wavelength of the laser can also be set according to the actual requirement.
Referring to fig. 1, in an embodiment, the lens unit 12 includes a first lens 121 and a second lens 122 disposed on the light exit path of the laser unit 11, where the first lens 121 is configured to collimate the laser beam 101, and the second lens 122 is configured to focus the laser beam 101, so that the emitting surface of the laser beam 101 after passing through the lens unit 12 is reduced, the diameter of the projected light spot is reduced, and the beam quality is improved. Optionally, the first lens 121 and the second lens 122 are sequentially disposed on a light emitting path of the laser, and the laser beam 101 generated by the laser is sequentially collimated by the first lens 121 and focused by the second lens 122, and then is emitted to the beam adjusting unit 13. Of course, in other embodiments, the first lens 121 and the second lens 122 may be provided in other forms, and are not limited to the above. The lens unit 12 may also include other types of lenses as long as it can adjust the laser beam 101 generated by the laser unit 11 so that the emission area of the laser beam 101 is reduced.
Referring to fig. 2, in an embodiment, the light beam adjusting unit 13 includes a light cone, the light cone has a first end surface 131 and a second end surface 132, which are respectively located at two ends of the light cone, and an area of the first end surface 131 is larger than an area of the second end surface 132. The first end face 131 of the light cone faces the lens unit 12 for the laser beam 101 to enter, and the second end face 132 of the light cone is for the laser beam 101 to exit. That is, the laser beam 101 is adjusted by the lens unit 12, enters the light cone from the large end surface (first end surface 131), and exits from the small end surface (second end surface 132). Because the light cone can effectively improve the damage threshold of the incident beam and can collimate the incident beam, the quality of the beam can be effectively improved after the laser beam 101 passes through the light cone, and the light-emitting area is reduced. It should be noted that the specific structure of the light cone may be set as needed, and is not limited to this.
Referring to fig. 2, in an embodiment, the light cone includes a cone 133 and a reflective layer 134, wherein two ends of the cone 133 are a first end face 131 and a second end face 132, respectively, and a diameter of the cone 133 gradually changes along an axial direction thereof, specifically, the diameter of the cone 133 gradually decreases from the first end face 131 to the second end face 132. The reflective layer 134 covers the outer surface of the cone 133, so that the laser beam 101 entering the cone 133 through the first end surface 131 is finally emitted from the second end surface 132 under the reflection action of the reflective layer 134, and the loss of the laser beam 101 is avoided.
The cone 133 and the reflective layer 134 can be made of common optical materials, such as glass with different refractive indexes, and are easy to process and low in cost. In one embodiment, the refractive index of the taper 133 is greater than the refractive index of the reflective layer 134, when the laser beam 101 propagates to the boundary between the taper 133 and the reflective layer 134 in the taper 133, and the incident angle is greater than the critical angle, the laser beam 101 is totally reflected, and the laser beam 101 propagates to the second end surface 132 in the taper 133, so that the loss of the laser beam 101 is effectively avoided.
In one embodiment, diameter D of first end face 1311Greater than 0.2mm, diameter D of second end face 1322Greater than 0.01mm, and when the laser beam 101 enters from the first end face 131 and exits from the second end face 132, the light emitting area of the laser beam 101 is smaller than (0.2-0.01) mm2Thereby reducing the size of the projected spot and thereby increasing the detection range of laser radar apparatus 100. Of course, in other embodiments, the diameters of the first end surface 131 and the second end surface 132 may have other values, and are not limited to the above. When the diameters of the first end surface 131 and the second end surface 132 are fixed, the shorter the length L of the taper 133 is, the greater the taper of the taper 133 is, and the sharper the change in taper of the taper 133 is.
Referring to fig. 3, in one embodiment, the light cone includes a cone 133 and a plurality of tapered optical fibers 135, wherein two ends of the cone 133 are a first end face 131 and a second end face 132, respectively, and a diameter of the cone 133 gradually changes along an axial direction thereof, and specifically, the diameter of the cone 133 gradually decreases from an end near the first end face 131 to an end near the second end face 132. The plurality of tapered optical fibers 135 are closely arranged in the taper 133, and the area of the end of the tapered optical fiber 135 facing the first end surface 131 is larger than that of the end facing the second end surface 132, so as to ensure that the light emitting area of the laser beam 101 is reduced after passing through the tapered optical fiber 135. The taper 133 may be made of a general optical material, and may be made of optical glass, for example. The laser beam 101 is totally reflected when being transmitted in the tapered fiber 135, so that the laser beam 101 can only exit from the second end face 132, and the loss of the laser beam 101 in the transmission process is effectively avoided.
Referring to FIG. 4, in one embodiment, the tapered optical fiber 135 includes a cladding layer 1351 and a core layer 1352. Wherein the diameter of the core layer 1352 gradually changes along its axial direction, and the area of one end 1353 of the core layer 1352 facing the first end face 131 is larger than the area of one end 1354 thereof facing the second end face 132, i.e., the diameter of the core layer 1352 gradually decreases from one end near the first end face 131 to one end near the second end face 132. When the laser beam 101 is incident into the core layer 1352 from the first end surface 131, the tapered optical fiber 135 can increase the damage threshold of the incident end, collimate the incident beam, and improve the beam quality. The cladding layer 1351 covers the outer surface of the core layer 1352, and the refractive index of the core layer 1352 is greater than that of the cladding layer, so that the laser beam 101 propagating in the core layer 1352 can undergo total reflection when reaching the interface between the core layer 1352 and the cladding layer 1351, and the optical energy loss of the beam in the process of conduction is effectively reduced.
In one embodiment, the tapered fiber 135 can be fabricated according to the actual requirements, for example, by a fusion draw method. The diameter of the cladding 1351 varies with the diameter of the core 1352 and ensures the same ratio of cladding diameter to core diameter at any cross-section in the tapered fiber 135. Of course, in other embodiments, the diameters of the cladding layer 1351 and the core layer 1352 may have other relationships, and are not limited to the above, as long as the laser beam 101 is ensured to be totally reflected in the tapered fiber 135 and finally exit the second end face 132.
The laser emitting module 10 provided by the present embodiment has at least the following beneficial effects: in the embodiment, by providing the beam adjusting unit 13 in the laser emitting module 10, when the laser beam 101 passes through the beam adjusting unit 13, the emitting surface of the laser beam 101 is reduced, which can effectively reduce the size of the projected light spot, thereby increasing the emitting optical path of the laser beam 101, and further contributing to increase the detection distance of the laser radar apparatus 100.
Referring to fig. 5, the present embodiment further provides a laser radar apparatus 100, which includes the laser emitting module 10, the laser receiving module 20, and the control module 30. The laser emitting module 10 is electrically connected to the control module 30, and is configured to emit a laser beam to the object 200 under the control of the control module 30; the laser receiving module 20 is electrically connected to the control module 30, and is configured to receive the light beam reflected by the object 200 under the control of the control module 30, and send information of the object 200 to the control module 30 after internal processing.
In one embodiment, the laser unit 11 in the laser emitting module 10 may further include a laser driving circuit, besides the laser, and the laser driving circuit is electrically connected to the laser for driving the laser to operate. The laser receiving module 20 may include a photodetector, a processor, etc. for receiving and processing the received reflected light beam; the control module 30 may include registers, processors, control circuits, etc. for controlling and processing the laser emitting module 10 and the laser receiving module 20 accordingly.
Referring to fig. 1, fig. 2 and fig. 5, a first embodiment:
a laser radar apparatus 100 includes a laser transmitter module 10, a laser receiver module 20, and a control module 30. The control module 30 is electrically connected to both the laser emitting module 10 and the laser receiving module 20. The laser emitting module 10 includes a laser unit 11, a lens unit 12, and a beam adjusting unit 13, wherein the lens unit 12 and the beam adjusting unit 13 are disposed on a light emitting path of the laser unit 11.
The laser unit 11 includes at least one laser; the lens unit 12 includes a first lens 121 and a second lens 122 disposed on the light exit path of the laser, the first lens 121 is used for collimating the laser beam 101, and the second lens 122 is used for focusing the laser beam 101.
The beam adjustment unit 13 includes a light cone including a cone 133 and a reflective layer 134, wherein two ends of the cone 133 are a first end face 131 and a second end face 132, respectively, and the diameter of the cone 133 is gradually reduced from the first end face 131 to the second end face 132. The reflective layer 134 covers the outer surface of the cone 133, and the refractive index of the cone 133 is greater than that of the reflective layer 134, so as to ensure that the laser beam 101 can be totally reflected in the light cone, and the laser beam 101 can propagate in the cone 133 to the second end surface 132 to be emitted, thereby effectively avoiding the loss of the laser beam 101.
Referring to fig. 1, fig. 3 to fig. 5, the second embodiment:
a laser radar apparatus 100 includes a laser transmitter module 10, a laser receiver module 20, and a control module 30. The control module 30 is electrically connected to both the laser emitting module 10 and the laser receiving module 20. The laser emitting module 10 includes a laser unit 11, a lens unit 12, and a beam adjusting unit 13, wherein the lens unit 12 and the beam adjusting unit 13 are disposed on a light emitting path of the laser unit 11.
The laser unit 11 includes at least one laser; the lens unit 12 includes a first lens 121 and a second lens 122 disposed on the light exit path of the laser, the first lens 121 is used for collimating the laser beam 101, and the second lens 122 is used for focusing the laser beam 101.
The beam adjustment unit 13 includes a light cone including a taper body 133 and a plurality of tapered optical fibers 135, wherein both ends of the taper body 133 are a first end surface 131 and a second end surface 132, respectively, and the diameter of the taper body 133 is gradually reduced from the first end surface 131 to the second end surface 132. A plurality of tapered optical fibers 135 are closely arranged within the taper 133, the tapered optical fibers 135 including a cladding layer 1351 and a core layer 1352, the core layer 1352 decreasing in diameter from an end proximate the first end face 131 to an end proximate the second end face 132. The cladding layer 1351 covers the outer surface of the core layer 1352, and the refractive index of the core layer 1352 is greater than that of the cladding layer, so that the laser beam 101 propagating in the core layer 1352 can undergo total reflection when reaching the interface between the core layer 1352 and the cladding layer 1351, and the optical energy loss of the beam in the process of conduction is effectively reduced.
The laser radar apparatus 100 provided in the present embodiment has at least the following beneficial effects: in the present embodiment, by providing the beam adjustment unit 13 in the laser emission module 10 of the laser radar apparatus 100, when the laser beam 101 passes through the beam adjustment unit 13, the emitting surface of the laser beam 101 may be reduced, which may effectively reduce the size of the projected light spot, thereby increasing the emitting optical path of the laser beam 101, and further facilitating the increase of the detection distance of the laser radar apparatus 100.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A laser transmitter module, comprising:
a laser unit for generating and emitting a laser beam;
the lens unit is arranged on a light emitting path of the laser unit and used for adjusting a propagation path of the laser beam; and the number of the first and second groups,
and the light beam adjusting unit is arranged on the light emitting path of the lens unit and used for reducing the emitting area of the laser beam.
2. The laser transmitter module of claim 1, wherein the beam shaping unit comprises a light cone; the light cone is provided with a first end face and a second end face, and the area of the first end face is larger than that of the second end face;
the first end face faces the lens unit and is used for allowing the laser beams to enter, and the second end face is used for allowing the laser beams to exit.
3. The laser transmitter module of claim 2, wherein the light cone comprises a cone body and a reflective layer, the cone body has two ends, namely the first end face and the second end face, and the reflective layer covers an outer surface of the cone body.
4. The laser emitting module of claim 3, wherein the taper has a refractive index greater than a refractive index of the reflective layer.
5. The laser transmitter module of claim 2, wherein the optical cone comprises a cone and a plurality of tapered optical fibers;
the two ends of the cone are the first end surface and the second end surface respectively;
the tapered optical fibers are arranged in the taper body, and the cross sectional area of one end, facing the first end face, of each tapered optical fiber is larger than that of one end, facing the second end face, of each tapered optical fiber.
6. The laser emitting module of claim 5, wherein the tapered optical fiber comprises a cladding layer and a core layer;
the diameter of the core layer is gradually reduced from one end facing the first end face to one end facing the second end face along the axial direction of the core layer;
the cladding layer is coated on the outer surface of the core layer.
7. The laser emitter module of claim 6, wherein the ratio of the diameter of the cladding to the diameter of the core at any cross-section in the tapered fiber is the same.
8. The laser transmitter module of any of claims 2 to 7, wherein the first end face has a diameter greater than 0.2mm and the second end face has a diameter less than 0.01 mm.
9. The laser transmitter module of any of claims 1 to 7, wherein the laser unit comprises at least one laser, each laser being a ruby laser, a he — ne laser or a laser diode;
and/or the presence of a gas in the gas,
the lens unit is including locating first lens and second lens on the laser unit light-emitting path, first lens are used for right laser beam carries out the collimation, the second lens is used for right laser beam focuses on.
10. A lidar device comprising a laser receiving module, a control module, and the laser transmitting module of any one of claims 1 to 9;
the laser emitting module and the laser receiving module are electrically connected with the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920655396.1U CN210347924U (en) | 2019-05-08 | 2019-05-08 | Laser emission module and laser radar device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920655396.1U CN210347924U (en) | 2019-05-08 | 2019-05-08 | Laser emission module and laser radar device |
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| CN210347924U true CN210347924U (en) | 2020-04-17 |
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