CN217213121U - Multi-line laser receiving and transmitting detection device - Google Patents
Multi-line laser receiving and transmitting detection device Download PDFInfo
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- CN217213121U CN217213121U CN202123396561.2U CN202123396561U CN217213121U CN 217213121 U CN217213121 U CN 217213121U CN 202123396561 U CN202123396561 U CN 202123396561U CN 217213121 U CN217213121 U CN 217213121U
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Abstract
The utility model relates to a laser detection technical field particularly, relates to a multi-line laser receiving and dispatching detection device. In the multi-line laser transceiving detection device, the optical fiber groups correspond to the coaxial transceivers one by one, and the output ends of the transmitting optical fibers, the input ends of the transceiving optical fibers and the input ends of the receiving optical fibers in the same group are connected through the corresponding coaxial transceivers; the input ends of the transmitting optical fibers are connected with the output end of the optical fiber laser, the output ends of the receiving optical fibers are connected with the optical fiber end cap, and the output ends of the receiving optical fibers are connected with the receiving end of the photoelectric detector. The multi-line laser receiving and transmitting detection device provided by the utility model has the advantages that the installation and adjustment difficulty is low, and the strong distance measurement capability can be ensured; the vertical resolution of the laser radar can be improved, and the equivalent line number can be improved.
Description
Technical Field
The utility model relates to a laser detection technical field particularly, relates to a multi-line laser receiving and dispatching detection device.
Background
The laser radar is used as a three-dimensional imaging technology and is widely applied to the fields of augmented reality, automatic driving, machine vision, aerospace and the like.
The multiline laser radar is provided with a plurality of transmitters and receivers in the vertical direction, a plurality of line bundles are obtained through the rotation of a motor, the more lines, the more perfect the surface profile of an object, and the laser radars with the line numbers of 16 lines, 32 lines, 64 lines, 128 lines and the like are on the market at present. Nowadays, the multiline concept is also used in the hybrid solid-state lidar to characterize the vertical resolution of the lidar, and compared with the traditional multiline lidar which transmits and receives in multiple paths, the hybrid solid-state lidar realizes equivalent multiline scanning by scanning laser by optical machine scanning elements such as a polygon rotating mirror, an MEMS vibrating mirror, a prism and the like.
However, in the current hybrid solid-state lidar, optical components are bulky and difficult to adjust, and in addition, the vertical resolution is also limited by optical machine scanning elements and high-speed scanning frequency, so that the equivalent line number is difficult to increase.
In summary, how to overcome the above-mentioned defects of the existing hybrid solid-state lidar is a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a multi-thread laser receiving and dispatching detection device to alleviate the difficult dress of mixing solid-state laser radar existence among the prior art and transfer, and the lower technical problem of vertical resolution.
The utility model provides a multi-thread laser receiving and dispatching detection device, including fiber laser, optic fibre end cap, photoelectric detector, optical lens, multiunit optic fibre group and a plurality of coaxial transceiver.
The optical fiber groups correspond to the coaxial transceivers one by one, each optical fiber group comprises a transmitting optical fiber, a receiving optical fiber and a receiving optical fiber, and the output end of the transmitting optical fiber, the input end of the receiving optical fiber and the input end of the receiving optical fiber in the same group are connected through the corresponding coaxial transceivers.
The input ends of the transmitting optical fibers are connected with the output end of the optical fiber laser, the output ends of the receiving and transmitting optical fibers are connected with the optical fiber end cap, and the output ends of the receiving optical fibers are connected with the receiving end of the photoelectric detector.
Preferably, as an implementation mode, the output ends of the transceiver optical fibers are all connected to the same optical fiber end cap.
Preferably, as an implementation mode, two adjacent transceiver optical fibers are in close contact.
Preferably, as an implementation mode, the output ends of the transceiver fibers are arranged in a single row.
Preferably, as an implementation mode, a connection line of centers of output ends of a plurality of transceiver optical fibers is coincident with a center of the optical fiber end cap.
Preferably, as an implementation manner, the fiber laser has a plurality of output pigtails, the emission fibers correspond to the output pigtails one to one, and input ends of the emission fibers are respectively connected to the corresponding output pigtails.
Preferably, as an implementation mode, an included angle between the output end face of the optical fiber end cap and a main optical axis of the optical lens is an acute angle;
preferably, as an embodiment, the output end face of the transceiver optical fiber is flush with the output end face of the optical fiber end cap.
Preferably, as an implementation mode, the transceiver fiber is a double-clad fiber, an inner cladding of the transceiver fiber is used for emitting laser, and an outer cladding of the transceiver fiber is used for receiving an echo signal of a target.
Preferably, as an implementation manner, the number of the photodetectors is multiple, the photodetectors correspond to the receiving optical fibers one to one, and output ends of the multiple receiving optical fibers are respectively connected with the corresponding photodetectors;
and/or the coaxial transceiver is provided with a receiving port, a transceiving port and an exit port, wherein the receiving port is connected with the output end of the transmitting optical fiber, the transceiving port is connected with the input end of the transceiving optical fiber, and the exit port is connected with the input end of the receiving optical fiber.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model provides a multi-thread laser receiving and dispatching detection device, the laser signal that fiber laser sent can be sent out via launching fiber, coaxial transceiver, receiving and dispatching optic fibre, optic fibre end cap and optical lens in proper order, after being reflected by the target, can be in proper order via optical lens, optic fibre end cap, receiving and dispatching optic fibre, coaxial transceiver and receiving optical fibre, finally received by photoelectric detector, photoelectric detector can be the signal of telecommunication with received light signal conversion, transmits for subsequent processing system.
Taking one group of optical fiber groups and the coaxial transceivers corresponding to the optical fiber groups as an example, a laser beam emitted by the optical fiber laser through the emitting optical fiber is transmitted to the receiving and emitting optical fiber through the coaxial transceivers, then is emitted out from one end of the receiving and emitting optical fiber connected to the optical fiber end cap, then passes through the optical lens, is shaped and collimated by the optical lens, is emitted to a target, is reflected by the target, is collected to one end of the receiving and emitting optical fiber connected to the optical fiber end cap through the optical lens along the original optical path, is transmitted to the receiving optical fiber through the receiving and emitting optical fiber and the coaxial transceivers in sequence, and is finally transmitted to the photoelectric detector through the receiving optical fiber.
Therefore, for the same laser beam, after the same laser beam is emitted by the corresponding receiving and transmitting optical fiber, the same laser beam is received by the receiving and transmitting optical fiber, namely, the emitting and receiving of the same laser beam are completed by the same receiving and transmitting optical fiber, so that the laser beam emitted by the receiving and transmitting optical fiber can be shaped and collimated by the optical lens only by arranging the optical lens in the laser emitting direction of the optical fiber end cap and assembling and adjusting the optical lens, and the laser beam reflected by a detection target can be gathered to the output end of the corresponding receiving and transmitting optical fiber, so that the receiving and transmitting of a plurality of wire harnesses can be realized, optical components are simplified, fewer factors are considered in the assembling and adjusting process, the difficulty is lower, the receiving and transmitting fields of view are consistent, and stronger ranging capability can be ensured; furthermore, the utility model provides a multi-thread laser receiving and dispatching detection device when integrated to in the current mixed solid-state laser radar system, can improve laser radar's vertical resolution, improves the equivalent line number.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required 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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a multi-line laser transceiving detection device provided by an embodiment of the present invention;
fig. 2 is a schematic view of light directions at two sides of an optical lens in the multi-line laser transceiving detection device according to the embodiment of the present invention;
fig. 3 is a schematic view of an assembly structure of an optical fiber end cap and a transmitting/receiving optical fiber in a multi-line laser transmitting/receiving detection device according to an embodiment of the present invention.
Description of reference numerals:
100-fiber laser;
200-a fiber end cap;
300-a photodetector;
400-an optical lens;
500-a coaxial transceiver;
610-a transmitting fiber; 620-a transceiver fiber; 630-a receiving fiber;
700-processing system.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
Referring to fig. 1 and 2, the present embodiment provides a multiline laser transceiving detection device, which includes a fiber laser 100, a fiber end cap 200, a photodetector 300, an optical lens 400, a multi-group fiber group, and a plurality of coaxial transceivers 500.
The optical fiber groups correspond to the coaxial transceivers 500 one by one, each optical fiber group comprises a transmitting optical fiber 610, a transmitting optical fiber 620 and a receiving optical fiber 630, and the output end of the transmitting optical fiber 610, the input end of the transmitting optical fiber 620 and the input end of the receiving optical fiber 630 in the same group are connected through the corresponding coaxial transceivers 500; the input ends of the transmitting fibers 610 are connected to the output end of the fiber laser 100, the output ends of the receiving and transmitting fibers 620 are connected to the fiber end cap 200, and the output ends of the receiving fibers 630 are connected to the receiving end of the photodetector 300.
In the multi-line laser transceiving detection apparatus provided in this embodiment, the laser signal emitted by the fiber laser 100 can be sequentially emitted through the emitting fiber 610, the coaxial transceiver 500, the transceiving fiber 620, the fiber end cap 200, and the optical lens 400, and after being reflected by the target, the laser signal can be sequentially emitted through the optical lens 400, the fiber end cap 200, the transceiving fiber 620, the coaxial transceiver 500, and the receiving fiber 630, and finally received by the photodetector 300, and the photodetector 300 can convert the received optical signal into an electrical signal and transmit the electrical signal to the subsequent processing system 700.
Taking one group of optical fiber groups and the coaxial transceiver 500 corresponding thereto as an example, a laser beam emitted from the optical fiber laser 100 via the emitting optical fiber 610 is transmitted to the receiving optical fiber 620 via the coaxial transceiver 500, then emitted from one end of the receiving optical fiber 620 connected to the optical fiber end cap 200, then passes through the optical lens 400, is shaped and collimated by the optical lens 400, and is emitted to a target, and after being reflected by the target, is collected to one end of the receiving optical fiber 620 connected to the optical fiber end cap 200 via the optical lens 400 along the original optical path, and is transmitted to the receiving optical fiber 630 via the receiving optical fiber 620 and the coaxial transceiver 500 in sequence, and finally is transmitted to the photodetector 300 via the receiving optical fiber 630.
Therefore, for the same laser beam, after the same laser beam is emitted by the corresponding transceiving optical fiber 620, the same laser beam is received by the transceiving optical fiber 620, that is, the emission and the reception of the same laser beam are completed by the same transceiving optical fiber 620, so that the optical lens 400 is only required to be arranged in the laser emitting direction of the optical fiber end cap 200, and through adjustment, the optical lens 400 can be ensured to shape and collimate the laser beam emitted by the transceiving optical fiber 620, and the laser beam reflected by a detection target can be gathered to the output end of the corresponding transceiving optical fiber 620, so that the transceiving of a plurality of wire harnesses can be realized, optical components are simplified, in the adjustment process, fewer factors are considered, the difficulty is lower, the transceiving fields of view are consistent, and the stronger ranging capability can be ensured; in addition, the multiline laser transceiving detection device provided by the embodiment can improve the vertical resolution of the laser radar and improve the equivalent line number when being integrated into the existing mixed solid-state laser radar system.
In addition, the all-fiber structure provided by the embodiment can be flexibly installed, is easy to integrate, and can realize distributed installation; compared with a single-channel transceiving device, the vertical resolution can be improved by N times (wherein N is the number of transceiving optical fibers), and the structure is compact because the optical scanning device can be matched with optical scanning elements.
Preferably, referring to fig. 1 and 3, the output ends of the transceiving optical fibers 620 can be connected to the same optical fiber end cap 200, so that the compactness of the arrangement of the transceiving optical fibers 620 can be improved, and the vertical resolution of the detection can be improved.
Further, two adjacent transceiver fibers 620 are in close contact to further improve the vertical resolution of the detection.
Particularly, the output ends of the plurality of transceiving optical fibers 620 may be arranged in a single row to reduce the process difficulty and facilitate the improvement of the practicability.
On the basis of the structure, the connecting line of the centers of the output ends of the plurality of transceiving optical fibers 620 can be set to coincide with the center of the optical fiber end cap 200, so that the end face utilization rate of the optical fiber end cap 200 can be improved, the volume of the optical fiber end cap 200 can be reduced, and the cost of the optical fiber end cap 200 can be reduced.
When the angle between adjacent light paths of the laser beam needs to be adjusted, the distance between two connected transmitting and receiving optical fibers 620 and the focal length of the optical lens 400 can be adjusted.
Specifically, a plurality of output pigtails may be disposed on the fiber laser 100, the emission fibers 610 correspond to the output pigtails one-to-one, and the input ends of the emission fibers 610 are respectively connected to the corresponding output pigtails, so that the fiber laser 100 may divide the laser beam into multiple paths, output the laser beams by the output pigtails, and transmit the laser beams to the corresponding emission fibers 610.
It should be noted that, the multiline laser transceiving detection device provided in this embodiment only needs a single fiber laser 100 to emit laser, thereby simplifying circuit devices.
Further, the fiber laser 100 may be configured to adjust the output power of a plurality of output pigtails, so that the output power of each output pigtail may be adjusted as needed, that is, the output power of all pigtails may be adjusted to be consistent, and at this time, the light intensity of each laser beam detected by the photodetector 300 is uniform, that is, the brightness of each region is consistent; the output powers of the output pigtails can be adjusted to be inconsistent, at this time, the brightness of different regions detected by the photodetector 300 will be different, specifically, the brightness of a region detected by a laser beam emitted by an output pigtail with higher output power will be higher, and when a region needs to be heavily detected, the output power of the output pigtail corresponding to the region can be adjusted to be higher.
The included angle between the output end face of the optical fiber end cap 200 and the main optical axis of the optical lens 400 can be set to be an acute angle, that is, the output end face of the optical fiber end cap 200 is not perpendicular to the main optical axis of the optical lens 400, so that the probability that the laser beam transmitted by the optical lens 400 is reflected back by the output end face of the optical fiber end cap 200 can be reduced, thereby reducing noise interference and improving the accuracy of the detection result.
Specifically, the output end face of the transceiver fiber 620 is disposed flush with the output end face of the fiber end cap 200.
The fiber end cap 200 can be a cylinder, a cone, or all possible combinations of the two.
The material used in the optical fiber end cap 200 in this embodiment has high transmittance for the transmission laser, and the refractive index is equal to the core refractive index of the optical fiber port matched with the end cap.
Specifically, the transceiver optical fiber 620 may be connected to the optical fiber end cap 200 by fusion.
The transceiver fiber 620 may be a double-clad fiber, wherein the inner cladding of the transceiver fiber 620 is used for emitting laser, and the outer cladding of the transceiver fiber 620 is used for receiving the echo signal of the target, so as to better ensure the coaxiality of emission and reception of the laser, and further reduce the difficulty of installation and adjustment.
Specifically, a plurality of photodetectors 300 are provided, the photodetectors 300 correspond to the receiving fibers 630 one by one, and the output ends of the receiving fibers 630 are respectively connected to the corresponding photodetectors 300, so that each photodetector 300 can receive the laser beam emitted by the corresponding receiving fiber 630.
In the specific structure of the coaxial transceiver 500, a receiving port, a transmitting/receiving port, and an exit port are provided, the receiving port of the coaxial transceiver 500 is connected to the output end of the transmitting fiber 610, the transmitting/receiving port of the coaxial transceiver 500 is connected to the input end of the transmitting/receiving fiber 620, and the exit port of the coaxial transceiver 500 is connected to the input end of the receiving fiber 630, so that the coaxial transceiver 500 can be used to indirectly connect the transmitting fiber 610, the transmitting/receiving fiber 620, and the receiving fiber 630.
The receiving port and the emitting port may be both disposed at the same end of the coaxial transceiver 500, and the transceiving interface may be correspondingly disposed at the other end of the coaxial transceiver 500.
To sum up, the embodiment of the utility model discloses a multi-line laser receiving and dispatching detection device, it has overcome traditional a great deal of technical defect who mixes solid-state laser radar. The embodiment of the utility model provides a multi-thread laser receiving and dispatching detection device, optical components are few, in the installation and debugging process, the factor of considering is less, the degree of difficulty is lower, and the receiving and dispatching visual field is unanimous, can guarantee stronger range finding ability; furthermore, the embodiment of the utility model provides a multi-line laser receiving and dispatching detection device when integrated to current mixed solid-state laser radar system, can improve laser radar's vertical resolution, improves the equivalent line number.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit 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 or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A multiline laser receiving and sending detection device is characterized by comprising an optical fiber laser (100), an optical fiber end cap (200), a photoelectric detector (300), an optical lens (400), a plurality of groups of optical fiber groups and a plurality of coaxial transceivers (500);
the optical fiber groups correspond to the coaxial transceivers (500) one by one, each optical fiber group comprises a transmitting optical fiber (610), a transmitting optical fiber (620) and a receiving optical fiber (630), and the output end of the transmitting optical fiber (610), the input end of the transmitting optical fiber (620) and the input end of the receiving optical fiber (630) in the same group are connected through the corresponding coaxial transceivers (500);
the input ends of the transmitting optical fibers (610) are connected with the output end of the optical fiber laser (100), the output ends of the receiving and transmitting optical fibers (620) are connected with the optical fiber end cap (200), and the output ends of the receiving optical fibers (630) are connected with the receiving end of the photoelectric detector (300).
2. The multiline laser transceiver probe of claim 1 wherein the output ends of the transceiver fibers (620) are all terminated to the same fiber end cap (200).
3. The multiline laser transceiver probe as claimed in claim 2, wherein adjacent two of said transceiver fibers (620) are in intimate contact.
4. The apparatus according to claim 2, wherein the output ends of the plurality of transmit/receive optical fibers (620) are arranged in a single row.
5. The multiline laser transceiver probe as claimed in claim 4, wherein a line connecting the centers of the output ends of the transceiver fibers (620) coincides with the center of the fiber end cap (200).
6. The multiline laser transmit-receive detection device according to claim 1, wherein the fiber laser (100) has a plurality of output pigtails, the transmitting fibers (610) correspond to the output pigtails one by one, and input ends of the transmitting fibers (610) are respectively connected to the corresponding output pigtails.
7. The multiline laser transceiver probe of claim 1, wherein the angle between the output end face of the optical fiber end cap (200) and the main optical axis of the optical lens (400) is acute.
8. The multiline laser transceiver probe of claim 1, wherein an output end face of the transceiver fiber (620) is flush with an output end face of the fiber end cap (200).
9. The multiline laser transmit-receive probe device according to claim 1, wherein the transmit-receive fiber (620) is a double-clad fiber, an inner cladding of the transmit-receive fiber (620) is used for emitting laser light, and an outer cladding of the transmit-receive fiber (620) is used for receiving an echo signal of a target.
10. The multiline laser transceiving detecting device according to claim 1, wherein the number of the photoelectric detectors (300) is plural, the photoelectric detectors (300) correspond to the receiving fibers (630) one by one, and the output ends of the receiving fibers (630) are respectively connected to the corresponding photoelectric detectors (300);
and/or the coaxial transceiver (500) is provided with a receiving port, a transmitting/receiving port and an emitting port, wherein the receiving port is connected with the output end of the transmitting optical fiber (610), the transmitting/receiving port is connected with the input end of the transmitting/receiving optical fiber (620), and the emitting port is connected with the input end of the receiving optical fiber (630).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123396561.2U CN217213121U (en) | 2021-12-27 | 2021-12-27 | Multi-line laser receiving and transmitting detection device |
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| CN202123396561.2U CN217213121U (en) | 2021-12-27 | 2021-12-27 | Multi-line laser receiving and transmitting detection device |
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| CN217213121U true CN217213121U (en) | 2022-08-16 |
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| CN202123396561.2U Active CN217213121U (en) | 2021-12-27 | 2021-12-27 | Multi-line laser receiving and transmitting detection device |
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