CN113985386A - Adjustable laser radar optical receiving device - Google Patents
Adjustable laser radar optical receiving device Download PDFInfo
- Publication number
- CN113985386A CN113985386A CN202111620137.3A CN202111620137A CN113985386A CN 113985386 A CN113985386 A CN 113985386A CN 202111620137 A CN202111620137 A CN 202111620137A CN 113985386 A CN113985386 A CN 113985386A
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- Prior art keywords
- focusing lens
- optical receiving
- photoelectric conversion
- cover
- adjusting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
Abstract
The invention discloses an adjustable laser radar optical receiving device, which comprises an optical filter, a focusing lens and a photoelectric conversion transmission module which are coaxially arranged from front to back, and also comprises a coarse adjustment mechanism for adjusting the axial position and angle of the focusing lens and a fine adjustment mechanism for adjusting the radial position of the photoelectric conversion transmission module; the coarse adjustment mechanism comprises a plurality of groups of top pull component groups for driving the focusing lens to axially displace, wherein each top pull component group comprises a front top component for pushing the focusing lens forwards and a rear pull component for pushing the focusing lens backwards. The focus axial position and the radial position of the focusing lens are adjusted through the coarse adjustment mechanism, the target surface radial position of the photoelectric conversion transmission module is adjusted through the fine adjustment mechanism, the focus of the focusing lens falls on the target surface of the photoelectric conversion transmission module, the problem that the existing optical receiving device cannot be adjusted after errors are generated due to the problems of machining, assembling and the like is solved, the precision of the optical receiving device is improved, and the performance of the whole laser radar is improved.
Description
Technical Field
The invention relates to a receiving device in a laser radar optical system.
Background
The optical system is an important component of the laser radar, and the optics comprise a transmitting device, a scanning device and a receiving device. The receiving device is used for collecting the laser radar echo light signals and focusing the echo light signals on the photoelectric detection unit. The receiving target surface of the laser radar photoelectric detection unit is small, the reasonable optical receiving device should meet the requirements of focal length and focal position, and the focused focal point is ensured to be positioned on the receiving target surface. The performance of the optical receiving device directly influences the laser radar action distance and the distance measurement precision, and meanwhile, the reasonability of the design of the adjusting mechanism of the optical receiving device influences the adjusting workload and the final adjusting effect of the laser radar optical unit.
The first problem to be considered in the design of the optical receiving device is the requirement of the focal length and the focal position of the optical system, and the requirement of the optical detection system can be met in design. The existing optical receiving device can not completely achieve the design effect due to the problems of processing, assembly and the like, and is difficult to adjust in practical use.
Disclosure of Invention
In view of this, the present invention provides an adjustable lidar optical receiving apparatus, which facilitates adjustment of a radial position of a photoelectric conversion module and a distance between the photoelectric conversion module and a focusing lens.
In order to solve the technical problems, the technical scheme of the invention is that an adjustable laser radar optical receiving device is adopted, and the adjustable laser radar optical receiving device comprises an optical filter, a focusing lens and a photoelectric conversion transmission module which are coaxially arranged from front to back, and also comprises a coarse adjusting mechanism used for adjusting the axial position and angle of the focusing lens and a fine adjusting mechanism used for adjusting the radial position of the photoelectric conversion transmission module; the coarse adjustment mechanism comprises a plurality of groups of top pull component groups for driving the focusing lens to axially displace, wherein each top pull component group comprises a front top component for pushing the focusing lens forwards and a rear pull component for pushing the focusing lens backwards.
The principle of the invention is as follows: the top pull component group in the coarse adjustment mechanism adjusts the focal distance and the focal position of the focusing lens by pushing or pulling the focusing lens partially or integrally. The fine adjustment mechanism can finely adjust the radial position of the target surface of the photoelectric conversion transmission module, so that the focus of the focusing lens falls on the target surface.
As an improvement, the fine adjustment mechanism comprises an adjustment hole formed on the photoelectric conversion transmission module and an adjustment bolt penetrating through the adjustment hole to fix the photoelectric conversion transmission module; the diameter of the adjusting hole is larger than the rod part of the adjusting bolt and smaller than the head part of the adjusting bolt. And the radial position of the photoelectric conversion transmission module is adjusted by utilizing the adjusting bolt and the adjusting hole.
As a further improvement, the photoelectric conversion module further comprises a cylindrical main mounting framework, and the photoelectric conversion module is fixed at the rear end of the main mounting framework by using an adjusting bolt. And taking the main mounting framework as a supporting structure of the photoelectric conversion transmission module.
As an improvement, the top pull component group comprises a front top adjusting bolt and a rear pull adjusting bolt. And the front jacking and the back pulling of the focusing lens are realized by using bolts.
As a further improvement, the device also comprises a focusing lens outer cover with a curved inner surface, a focusing lens inner cover with a curved outer surface and a cylindrical focusing lens bottom cover; the focusing lens inner cover is arranged in the focusing lens outer cover, and the curved surface of the outer surface of the focusing lens inner cover is matched with the curved surface of the inner surface of the focusing lens outer cover; the inner wall of the focusing lens bottom cover is a curved surface matched with the focusing lens; the focusing lens bottom cover and the focusing lens inner cover are in threaded connection to clamp the focusing lens. The outer cover is matched with the inner cover in a curved surface mode, so that the inner cover can rotate in the outer cover, and the purpose of adjusting the angle is achieved.
As a further improvement, a connecting ring is fixedly sleeved outside the focusing lens bottom cover; the focusing lens outer cover is provided with a plurality of adjusting hole groups, and each adjusting hole group comprises a front top screw hole and a rear pull through hole; the front top adjusting bolt penetrates through the front top screw hole and abuts against the end face of the connecting ring, and the rear pull adjusting bolt penetrates through the rear pull through hole and is connected with the screw hole in the end face of the connecting ring. The top pull component group acts on the connecting ring, and is convenient to arrange.
As an improvement, an elastic pre-tightening component is arranged between the focusing lens inner cover and the focusing lens outer cover. The elastic pre-tightening component is used for compensating the clearance between the inner focusing lens cover and the outer focusing lens cover after adjustment, and meanwhile, the adjustment range can be limited.
Preferably, the elastic pre-tightening part is a gasket; the gasket is a round hard plastic rubber ring, and the maximum compression deformation amount of the gasket is 28% -32%.
As an improvement, the outer surface of the focusing lens inner cover and the inner surface of the focusing lens outer cover are respectively provided with a mounting groove with an arc-shaped cross section, and the gasket is arranged in the mounting groove. The gasket is positioned, and the gasket is prevented from deviating.
As an improvement, the front end of the focusing lens is provided with an optical filter fixing seat and an optical filter end cover, and the optical filter end cover is in threaded connection with the optical filter fixing seat to clamp the optical filter.
The invention has the advantages that: the adjustable laser radar optical receiving device with the structure adjusts the axial position and the radial position of the focus of the focusing lens through the coarse adjustment mechanism, adjusts the radial position of the target surface of the photoelectric conversion transmission module through the fine adjustment mechanism, so that the focus of the focusing lens falls on the target surface of the photoelectric conversion transmission module, the problem that the existing optical receiving device cannot be adjusted due to errors generated by machining, assembling and other problems is solved, the precision of the optical receiving device is improved, and the performance of the whole laser radar is improved.
Drawings
Fig. 1 is an exploded view of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
Fig. 3 is a schematic diagram of the optical path of the present invention.
The labels in the figure are: the optical filter comprises an optical filter 1, a focusing lens 2, a photoelectric conversion module 3, a main mounting framework 4, a focusing lens outer cover 5, a focusing lens inner cover 6, a focusing lens bottom cover 7, a connecting ring 8, an optical filter fixing seat 9, an optical filter end cover 10, a gasket 11, a front jacking adjusting bolt 21, a rear pulling adjusting bolt 22, a front jacking screw hole 23, a rear pulling through hole 24, an adjusting hole 31, a connecting claw 51 and a screw hole 81.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following embodiments.
As shown in fig. 3, the present invention includes an optical filter 1, a focusing lens 2, and a photoelectric conversion module 3, which are coaxially installed from front to back.
In this embodiment, the filter 1 is a narrow-band filter with a filter wavelength of ± 20 nm. The focusing lens 2 is a polished aspheric focusing lens. The narrow-band filter wave band is matched with a laser radar light source, the detection signal interference caused by the fact that a non-specified wavelength random light source is incident to the polished aspheric focusing lens can be effectively prevented, the polished aspheric focusing lens can achieve short focal length and small light spot focusing, and the size of a focused light spot is smaller than 1/4 of the photoelectric detection unit. The photoelectric conversion module 3 comprises a photoelectric conversion sensor and a rear-end signal processing analog circuit, wherein the photoelectric conversion sensor can adopt an avalanche photodiode, and the bandwidth and noise are matched with the rear-end signal processing analog circuit; the avalanche photodiode can be provided with a transimpedance amplifier (TIA), and the effective target surface is more than or equal to 0.2mm x 0.2 mm. The back end signal processing analog circuit completes the functions of signal acquisition, amplification, denoising, keeping and the like of the photoelectric conversion sensor, the design bandwidth of the analog circuit can meet the detection requirement of laser radar signals, and meanwhile, the analog circuit can be matched with the photoelectric conversion sensor.
The focusing lens 2 can realize the focusing of parallel return light after pulse laser signals emitted by the laser radar are subjected to diffuse reflection by a detected target, the size of a light spot focused by the focusing lens can be selected according to the size of a target surface of the photoelectric conversion sensor, and the effective focal length EFL or the effective distance WD focused by the focusing lens determines the distance from the photoelectric conversion sensor to the focusing lens.
The existing optical receiving device can cause that the focus of the focusing lens can not fall on the target surface of the photoelectric conversion module due to production and assembly errors, thereby the design effect can not be completely achieved. And the volume of the optical receiving device is small, and an adjusting device is not designed, so that the optical receiving device cannot be adjusted or is difficult to adjust.
As shown in fig. 1 and 2, in order to solve this problem, the present invention further includes a coarse adjustment mechanism for adjusting the axial position and angle of the focusing lens 2 and a fine adjustment mechanism for adjusting the radial position of the photoelectric conversion module 3.
Specifically, the coarse adjustment mechanism includes a plurality of sets of pull-up member sets for driving the axial displacement of the focus lens 2, each of the pull-up member sets including a front pull-up member for pushing up the focus lens 2 in front and a rear pull-up member for pushing up the focus lens in rear. In this embodiment, the top pull component group includes a front top adjusting bolt 21 and a rear pull adjusting bolt 22, and three top pull component groups are designed in total and are uniformly distributed at intervals of 120 ° along the circumference. The invention also designs a supporting and mounting structure of the focusing lens 2, which comprises a focusing lens outer cover 5 with a curved inner surface, a focusing lens inner cover 6 with a curved outer surface and a cylindrical focusing lens bottom cover 7; the focusing lens inner cover 6 is arranged in the focusing lens outer cover 5, and the curved surface of the outer surface of the focusing lens inner cover 6 is matched with the curved surface of the inner surface of the focusing lens outer cover 5; the inner wall of the focusing lens bottom cover 7 is a curved surface matched with the focusing lens 2; the focusing lens bottom cover 7 and the focusing lens inner cover 6 are in threaded connection to clamp the focusing lens 2. A connecting ring 8 is fixedly sleeved outside the focusing lens bottom cover 7; the focusing lens outer cover 5 is provided with a plurality of adjusting hole groups, and each adjusting hole group comprises a front top screw hole 23 and a rear pull-through hole 24; the front top adjusting bolt 21 penetrates through the front top screw hole 23 and abuts against the end face of the connecting ring 8, and the rear pull adjusting bolt 22 penetrates through the rear pull through hole 24 and is connected with the screw hole 81 in the end face of the connecting ring 8.
An elastic pre-tightening means may be provided between the focus lens inner cover 6 and the focus lens outer cover 5. Preferably, the elastic pre-tightening part is a gasket 11; the gasket 11 is a round hard plastic rubber ring, and the maximum compression deformation amount of the gasket is 28% -32%. The outer surface of the focusing lens inner cover 6 and the inner surface of the focusing lens outer cover 5 are both provided with mounting grooves with arc-shaped cross sections, and the gasket 11 is arranged in the mounting grooves.
The fine adjustment mechanism comprises an adjustment hole 31 formed on the photoelectric conversion transmission module 3, and an adjustment bolt (not shown in the figure) penetrating through the adjustment hole 31 and fixing the photoelectric conversion transmission module 3; the diameter of the adjusting hole 31 is larger than the rod part of the adjusting bolt and smaller than the head part of the adjusting bolt. Because the diameter of the adjusting hole 31 is larger than the rod part of the adjusting bolt, the photoelectric conversion module 3 can be adjusted by a certain amount on the radial plane, and the adjusting bolt is used for fastening after the adjustment is finished. Of course, the adjusting holes 31 and the adjusting bolts can be arranged in a plurality, so that better stability is achieved.
The invention also designs a cylindrical main mounting framework 4 for supporting and mounting the photoelectric conversion transmission module 3, wherein the photoelectric conversion transmission module 3 is fixed at the rear end of the main mounting framework 4 by utilizing an adjusting bolt.
The front end of the focusing lens 2 is specifically provided with an optical filter fixing seat 9 for the front end of a focusing lens bottom cover 7, and the focusing lens optical filter 10 and optical filter fixing seat 9 in threaded connection.
In addition, in the present embodiment, the focus lens outer cover 5 is fixed to the main mounting frame 4, and the filter holder 9 is fixed to the focus lens bottom cover 7, so that the entire apparatus is integrated.
When adjustment is required, the axial position and the radial position of the focal point of the focusing lens 2 are first determined using a coarse adjustment mechanism. The adjustment of the axial position is performed by adjusting the same amount for all the push-pull member sets so that the focusing lens 2 can be advanced or retracted in the axial direction. The radial position of the focus is realized by adjusting the angle of the focusing lens 2, and the focusing lens 2 deflects by a certain angle by adjusting different amounts of different top pull component groups, so that the radial position of the focus is changed. After the position of the focus is determined, the position of the photoelectric conversion module 3 on the radial plane is adjusted by using the fine adjustment mechanism, so that the focus just falls on the target surface, thereby completing the adjustment.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. The utility model provides a laser radar optical receiver with adjustable, includes filter, focusing lens and the photoelectric conversion who passes module, its characterized in that from the past to back coaxial arrangement: the device also comprises a coarse adjustment mechanism for adjusting the axial position and the angle of the focusing lens and a fine adjustment mechanism for adjusting the radial position of the photoelectric conversion module; the coarse adjustment mechanism comprises a plurality of groups of top pull component groups for driving the focusing lens to axially displace, wherein each top pull component group comprises a front top component for pushing the focusing lens forwards and a rear pull component for pushing the focusing lens backwards.
2. The tunable lidar optical receiving apparatus according to claim 1, wherein: the fine adjustment mechanism comprises an adjustment hole formed in the photoelectric conversion transmission module and an adjustment bolt penetrating through the adjustment hole to fix the photoelectric conversion transmission module; the diameter of the adjusting hole is larger than the rod part of the adjusting bolt and smaller than the head part of the adjusting bolt.
3. The tunable lidar optical receiving apparatus according to claim 2, wherein: the photoelectric conversion module is fixed at the rear end of the main mounting framework by using an adjusting bolt.
4. The tunable lidar optical receiving apparatus according to claim 1, wherein: the top pull component group comprises a front top adjusting bolt and a rear pull adjusting bolt.
5. The tunable lidar optical receiving apparatus according to claim 4, wherein: the focusing lens cover with the curved inner surface, the focusing lens inner cover with the curved outer surface and the cylindrical focusing lens bottom cover are also included; the focusing lens inner cover is arranged in the focusing lens outer cover, and the curved surface of the outer surface of the focusing lens inner cover is matched with the curved surface of the inner surface of the focusing lens outer cover; the inner wall of the focusing lens bottom cover is a curved surface matched with the focusing lens; the focusing lens bottom cover and the focusing lens inner cover are in threaded connection to clamp the focusing lens.
6. The tunable lidar optical receiving apparatus according to claim 5, wherein: a connecting ring is fixedly sleeved outside the focusing lens bottom cover; the focusing lens outer cover is provided with a plurality of adjusting hole groups, and each adjusting hole group comprises a front top screw hole and a rear pull through hole; the front top adjusting bolt penetrates through the front top screw hole and abuts against the end face of the connecting ring, and the rear pull adjusting bolt penetrates through the rear pull through hole and is connected with the screw hole in the end face of the connecting ring.
7. The tunable lidar optical receiving apparatus according to claim 5, wherein: an elastic pre-tightening component is arranged between the focusing lens inner cover and the focusing lens outer cover.
8. The tunable lidar optical receiving apparatus according to claim 7, wherein: the elastic pre-tightening component is a gasket; the gasket is a round hard plastic rubber ring, and the maximum compression deformation amount of the gasket is 28% -32%.
9. The tunable lidar optical receiving apparatus according to claim 8, wherein: the outer surface of the focusing lens inner cover and the inner surface of the focusing lens outer cover are both provided with mounting grooves with arc-shaped cross sections, and the gaskets are arranged in the mounting grooves.
10. The tunable lidar optical receiving apparatus according to claim 1, wherein: the focusing lens comprises a focusing lens body and a focusing lens, wherein the focusing lens body is provided with a focusing lens, the focusing lens body is arranged in the focusing lens body, the focusing lens body further comprises a light filter fixing seat, and the light filter end cover is in threaded connection with the light filter fixing seat to clamp the light filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111620137.3A CN113985386A (en) | 2021-12-28 | 2021-12-28 | Adjustable laser radar optical receiving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111620137.3A CN113985386A (en) | 2021-12-28 | 2021-12-28 | Adjustable laser radar optical receiving device |
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| CN113985386A true CN113985386A (en) | 2022-01-28 |
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| CN202111620137.3A Pending CN113985386A (en) | 2021-12-28 | 2021-12-28 | Adjustable laser radar optical receiving device |
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2021
- 2021-12-28 CN CN202111620137.3A patent/CN113985386A/en active Pending
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Application publication date: 20220128 |