CN215297679U - Laser radar compression optical program type coaxial light receiving and emitting optical system - Google Patents
Laser radar compression optical program type coaxial light receiving and emitting optical system Download PDFInfo
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- CN215297679U CN215297679U CN202121353477.XU CN202121353477U CN215297679U CN 215297679 U CN215297679 U CN 215297679U CN 202121353477 U CN202121353477 U CN 202121353477U CN 215297679 U CN215297679 U CN 215297679U
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Abstract
The utility model discloses a coaxial receipts optical system that sends out of laser radar compression light form, including the laser instrument, receive the speculum, the transmission optical unit of constituteing by the transmission lens combination, the receiving optical unit of constituteing by the receiving lens combination, isolating device and signal processing system, the through-hole has been seted up to the receiving speculum, the receiving optical unit, the transmission optical unit, the equal coaxial setting of isolating device, be provided with the correction lens who is used for shortening the receiving optical path in the receiving lens combination, the laser that the laser instrument launches is through the through-hole of receiving the speculum, and through the back outgoing of transmission lens combination refraction, the light of reverberation is through the receiving lens combination, and reflect to signal processing system by the receiving reflector. The utility model discloses a coaxial receipts optical system that receives of compression light form adopts laser radar to carry out the detection of atmospheric particulates, sets up correction lens in receiving optical unit, has compressed the receipt optical path greatly to laser radar telescope's volume has been reduced greatly when concrete application.
Description
Technical Field
The utility model relates to a laser radar's receiving and dispatching optical system technical field, more specifically relates to a coaxial receiving and dispatching optical system of laser radar compression light form.
Background
Laser radar is one of the rapidly developing high and new technologies, and is a product of combining the traditional radar technology and the modern laser technology. The laser radar transmits laser pulses to the air, atmospheric optical characteristic research is carried out by receiving backscattering of aerosol particles in the atmosphere to the laser pulses, and atmospheric visibility, aerosol particle space-time distribution and space-time change, cloud base cloud height, boundary layer height, aerosol particle characteristics and the like are analyzed according to the atmospheric optical characteristic research. Since the returned laser backscatter signal is very weak, in addition to signal detection using a highly sensitive detector, an optical telescope that receives the laser backscatter signal is a key component that affects the performance of the laser radar.
The application number is 2006100960637, the name of the utility model is Chinese utility model patent of "laser radar transmission type double-focus light receiving and emitting optical system", discloses a laser radar transmission type double-focus light receiving and emitting optical system, which comprises an emission optical unit composed of a reflector, a beam expander and an emission lens with the focus of f 1; a receiving optical unit consisting of a receiving lens having a focal length f 2. The transmitting lens is mounted in a hole in the center of the receiving lens. The light beam emitted by the laser is emitted as parallel light beam through the reflector, the beam expander and the transmitting lens, and the back scattered echo signal is converged at the tail part of the lens barrel through the receiving lens. Then the detection system composed of diaphragm, collimating lens, optical filter and detector can be used for making photoelectric signal conversion, and finally the photoelectric signal can be fed into computer to make analysis and processing. The method is used for qualitative and quantitative detection of aerosol particles, determination of the height of an atmospheric boundary layer, vertical distribution of the aerosol particles, time change of the aerosol particles and layering characteristics of the aerosol particles in a troposphere. The laser radar light receiving and emitting optical system is coaxially designed, and an emitting light path and a receiving light path can be overlapped to cause serious interference. Further, the receiving optical unit has a long receiving optical path, and a laser radar telescope manufactured by using such a transmitting/receiving optical system has a large volume.
In view of the above, there is a need to improve the transmitting and receiving optical system of the laser radar in the prior art to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to disclose a coaxial receipts of laser radar compression light form optical system, solved among the prior art emission light path and receive the light path seriously interfere, and receive the longer problem of light path.
In order to achieve the above object, the utility model provides a laser radar compression light form is coaxial to receive optical system, including laser instrument, receiving mirror, the transmitting optical unit who constitutes by the transmitting lens combination, the receiving optical unit who constitutes by the receiving lens combination, signal processing system, and be used for with the light that the receiving optical unit received with the isolating device that the light that the transmitting optical unit sent keeps apart, the through-hole has been seted up to the receiving mirror, the receiving optical unit the transmitting optical unit, the equal coaxial setting of isolating device, the transmitting lens combination includes the lens that two at least coaxial stacks set up, the receiving lens combination includes the lens of two at least coaxial settings, be provided with the correction lens that is used for shortening the receiving optical path in the receiving lens combination, the laser process that the laser instrument launches the through-hole of receiving mirror, And the reflected light rays are emitted after being refracted by the transmitting lens combination, pass through the receiving lens combination and are reflected to the signal processing system by the receiving reflector.
As a further improvement, the light receiving and emitting optical system further comprises a laser reflector arranged on the emission light path, and laser emitted by the laser device passes through the laser reflector, the laser reflector reflects and passes through the through hole of the light receiving reflector, and the emission lens is combined and refracted to be emitted.
As a further improvement of the present invention, the laser reflector and the receiving reflector are arranged in parallel.
As a further improvement of the present invention, the transmitting lens assembly includes a plurality of lenses, a plurality of lenses coaxially disposed, and the lenses are concave lenses or convex lenses.
As a further improvement of the present invention, the transmitting lens assembly includes a first convex lens, a first concave lens and a second convex lens, and the first convex lens, the first concave lens and the second convex lens are sequentially stacked.
As a further improvement of the utility model, the emission optical unit still include on the transmission light path set up in the beam expanding lens of emission lens combination front end, the beam expanding lens is concave lens, the beam expanding lens with the coaxial setting of emission lens combination, just the diameter of beam expanding lens is less than the diameter of arbitrary lens in the emission lens combination.
As a further improvement of the present invention, the receiving lens assembly includes a third convex lens, a correcting lens and a second concave lens which are coaxially disposed, the correcting lens is disposed between the third convex lens and the second concave lens, and the correcting lens is a convex lens.
As a further improvement of the present invention, the third convex lens is a plano-convex lens, and the correction lens is a biconvex lens.
As a further improvement of the present invention, the optical transceiver system includes an inner barrel, the transmitting lens assembly is disposed inside the inner barrel, and one end of the isolating device is abutted to one end of the inner barrel in the axial direction of the transmitting light path.
As a further improvement of the present invention, the isolation device is a light shielding tube made of carbon fiber.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses a coaxial receipts optical system that sends of laser radar compression light form sets up and receives the isolating device of the coaxial setting of optical unit and transmission optical unit, and the light that will receive the optical unit and receive and send the optical unit and carry out effective isolation, has avoided the problem of the interference of each other of receiving light path and transmission light path. Meanwhile, a correction lens is arranged in the receiving optical unit, so that the receiving optical path is greatly compressed, and the size of the laser radar telescope is greatly reduced in specific application.
Drawings
Fig. 1 is a schematic structural diagram of a laser radar compression optical path type coaxial transceiver telescope according to an embodiment of the present invention;
FIG. 2 is a schematic view of the telescopic illuminator system provided in FIG. 1;
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
It will be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," "positive," "negative," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered as limiting the present disclosure.
Referring to fig. 1 and 2, a lidar compression optical path type coaxial transceiver telescope 100 includes a laser 1 disposed in a laser holder, a laser reflector 7 disposed at one side of the laser 1, a receiving reflector 2 disposed parallel to the laser reflector 7, an outer barrel 4 disposed in front of the receiving reflector 2, an inner barrel 3 disposed at an exit end of the telescope 100 and coaxially disposed inside the outer barrel 4, a transmitting optical unit a disposed in the inner barrel 3, a receiving optical unit b disposed between the inner barrel 3 and the outer barrel 4, an isolating device 5 extending from a reflection surface of the laser reflector 7 toward the inner barrel 3, and a signal processing system 6 for optical signal conversion.
A laser mirror 7 is provided on one side of the laser 1, and light emitted from the laser 1 is reflected by the laser mirror 7 and then enters the emission optical unit a. The laser 1 is arranged in a rectangular laser holder, and the laser reflector 7 is arranged in front of the laser 1, so that the laser holder can be transversely arranged, and the structural space of the telescope 100 can be further reasonably configured.
The receiving mirror 2 is arranged longitudinally parallel to the laser mirror 7, and the receiving mirror 2 is mounted on a mirror mount in a mirror mounting area 21. The reflector 2 is obliquely arranged at an angle of 45 degrees, and a through hole is formed in the center of the reflector 2.
The isolation device 5 and the inner barrel 3 are arranged extending along the longitudinal axis of the telescope 100. In the present embodiment, the spacer 5 extends from the reflecting surface of the laser mirror 7 in the direction of the inner barrel 3 and abuts against the lower end of the inner barrel 3, and passes through the through hole of the receiving mirror 2. The light emitting area is isolated on the light emitting path of the laser 1 by the combination of the isolation device 5 and the inner barrel 3. The emission optical unit a is located in the light emission region. The emission optical unit a includes a beam expander 32 and an emission lens assembly 33 sequentially arranged on the emission light path. The emission lens assembly 33 includes a plurality of lenses coaxially disposed, and the lenses are concave lenses or convex lenses. In the present embodiment, the emission lens assembly 33 includes a first convex lens 331, a first concave lens 332, and a second convex lens 333, and the first convex lens 331, the first concave lens 332, and the second convex lens 333 are sequentially superimposed. Preferably, the diameters of the first convex lens 331, the first concave lens 332 and the second convex lens 333 are equal, and the diameter of the beam expander 32 is smaller than that of the emitting lens combination 33; further, the first convex lens 331 and the second convex lens 333 are biconvex lenses, the first concave lens 332 is a biconcave lens, and the beam expander 32 is a biconcave lens. In the present embodiment, the isolation device 5 is a light shielding tube made of carbon fiber. The beam expander 32 is disposed in the inner barrel 3 and near the connection portion of the inner barrel 3 and the isolator 5, and the transmitting lens assembly 33 is disposed inside the inner barrel 3 and at the end of the telescope 100. The beam expander 32 and the transmitting lens assembly 33 are respectively fixed on the inner lens barrel 3 through a pressing ring and a spacing ring, so that the beam expander and the transmitting lens assembly have high optical path stability. In a preferred embodiment, the beam expander 32 is fixed in the inner barrel 3 by a clamping ring made of aviation silica gel, so that the stability of the light path is further improved.
The combination of the outer lens cone 4 and the inner lens cone 3 isolates a light receiving area in front of the receiving reflector 2, namely the light receiving area is coaxially arranged on the outer ring of the light emitting area, and the inner lens cone 3 and the isolating device 5 are used for isolating the light interference. The receiving optical unit b is located in the light receiving area. The receiving optical unit b includes a plurality of lenses sequentially arranged on the receiving optical path, the plurality of lenses being coaxially arranged, and the lenses being concave lenses or convex lenses. In the present embodiment, the receiving lens assembly 43 includes a third convex lens 432 and a second concave lens 431, and a correction lens 433 is disposed between the third convex lens 432 and the second concave lens 431, preferably, the correction lens 433 and the third convex lens 432 have the same diameter, the diameter of the second concave lens 431 is slightly smaller than the diameter of the third convex lens 432, and further, the third convex lens 432 is a plano-convex lens, the correction lens 433 is a double convex lens, and the second concave lens 431 is a meniscus concave lens. The third convex lens 432 and the correction lens 433 are both annular, and are disposed between the inner barrel 3 and the outer barrel 4 and at an end of the telescope 100. The third convex lens 432 and the second concave lens 431 are respectively fixed between the inner barrel 3 and the outer barrel 4 through pressing rings, so that the stability of the optical path is high.
By providing the correction lens 433 in the reception lens group 43, the reception optical path is greatly compressed, and the volume of the telescope 100 is greatly reduced.
In one embodiment, the outer barrel 4 specifically includes a large barrel 41 disposed at an end of the telescope 100, and an intermediate barrel 42 connecting the large barrel 41 and the mirror mount region 21.
The signal processing system 6 is disposed in a position perpendicular to the outer barrel 4 at 90 ° with respect to the mirror mounting region 21. The signal processing system 6 comprises an optical polarization analysis system, a photoelectric detection system and a signal acquisition and analysis system, wherein a collimating mirror 61 and a polarization analysis prism 62 are arranged in the optical polarization analysis system, and after being collimated by the collimating mirror 61, the received light path is further formed into two vertical channel signals by the polarization analysis prism 62.
The utility model provides a pair of laser radar compression optical path type coaxial receiving and dispatching telescope 100 discloses a compression optical path type receiving and dispatching optical system. The compressed optical path type light receiving and emitting optical system is applied to detection of atmospheric particulates, and the specific working principle is as follows: take remote sensing detection of atmospheric particulates by using pulse laser with 532nm wavelength as an example. Pulse laser with 532nm wavelength is emitted by a laser 1, the pulse laser is reflected by a laser reflector 7, and is collimated and expanded by a light emitting unit a and then enters the atmosphere, and interacts with particulate matters in the atmosphere to generate backward scattering light, scattering signals are received by an optical receiving unit b of a telescope 100, are reflected by a receiving reflector 2 and are converged to an optical polarization detection system to form 532nm parallel and 532nm vertical two channel signals, and the spatial distribution (profile) of an extinction coefficient and a depolarization factor of the atmospheric particulate matters is inverted by a computer through a photoelectric detection system and a signal acquisition system, so that atmospheric quality information such as atmospheric particulate matter space-time distribution characteristics, pollution space-time layer change, particulate matter transportation and settlement can be obtained.
In a preferred embodiment, the main optical properties of the coaxial transceiver system of the present invention are set as follows: the magnification Γ of the emission optical unit a is set to 10, and the emission aperture D is set to 17 mm. Diameter D of entrance pupil of receiving optical unit bOuter coverSet to 180mm, entrance pupil diameter DInner partSet to 28mm and the effective diameter D to 172.9mm, the lens focal length F 'of the corresponding receiving lens assembly 43 is 749.8, the optic focal length 1F' of the receiving objective lens is 603.8, and the receiving field 2 ω is set to 0.67 mrad. The lens focal length f' of the collimator lens 61 is 19.27. When the correction lens 433 is not provided, the receiving optical length d is 750 mm; after the correction lens 433 is set, the receiving optical path d is compressed to 360 mm. The coaxial light-emitting and receiving optical system implemented by the embodiment can reach 15km in detection distance and reduce the dead zone to 30 m.
The utility model discloses a coaxial receiving and dispatching telescope 100 of laser radar compression optical path formula discloses a coaxial receipts optical system of compression light form, and the beam expanding lens 32 that sets up coaxially at the light path front end of transmitting lens combination 33, and sets up second concave lens 431 on receiving the light path and as adjustment mechanism, combines third convex lens 432 to carry out the collimation timing through beam expanding lens 32 for telescope 100's coaxial timing precision is very high, and the timing precision can reach 2 seconds. The beam expander 32 is arranged at the front end of the light path of the transmitting lens combination 33, and the diameter of the beam expander 32 relative to the transmitting lens combination 33 is smaller than 2/3, so that a detection blind area is reduced, the detection blind area can be controlled within 30m by combining with higher coaxial adjustment precision, and the detection distance can reach 8-15 km.
The utility model provides a pair of coaxial transceiver telescope 100 of laser radar compression optical path formula discloses a coaxial receipts optical system of compression light form, sets up and receives the isolating device 5 of the coaxial setting of optical unit b and transmission optical unit an, and the light that will receive optical unit b received light and transmission optical unit an and send effectively keeps apart, has avoided the problem of the interference of each other of receiving light path and transmission light path. Meanwhile, the provision of the correction lens 433 in the receiving optical unit b greatly compresses the receiving optical path d, thereby greatly reducing the volume of the telescope 100.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A laser radar compression optical program coaxial light receiving and emitting optical system is characterized by comprising a laser, a receiving reflector, a light emitting optical unit consisting of a light emitting lens combination, a light receiving optical unit consisting of a light receiving lens combination, a signal processing system and an isolating device for isolating light received by the light receiving optical unit from light emitted by the light emitting optical unit, wherein the light receiving reflector is provided with a through hole, the light receiving optical unit, the light emitting optical unit and the isolating device are coaxially arranged, the light emitting lens combination comprises at least two coaxially superposed lenses, the light receiving lens combination comprises at least two coaxially arranged lenses, a correcting lens for shortening a receiving optical path is arranged in the light receiving lens combination, and laser emitted by the laser passes through the through hole, the light receiving reflector and the isolating device, And the reflected light rays are emitted after being refracted by the transmitting lens combination, pass through the receiving lens combination and are reflected to the signal processing system by the receiving reflector.
2. The lidar compressed optical-form coaxial transceiver optical system according to claim 1, further comprising a laser reflector disposed on the emission optical path, wherein the laser emitted from the laser is reflected by the laser reflector, passes through the through hole of the receiver reflector, and is refracted by the emission lens assembly, and then is emitted.
3. The lidar compressed optical-form coaxial transceiver optical system of claim 2, wherein the laser mirror and the receiving mirror are disposed in parallel.
4. The lidar compressed optical form coaxial transceiver optical system of claim 1, wherein the transmitting lens assembly comprises a plurality of lenses, the plurality of lenses are coaxially arranged, and the lenses are concave lenses or convex lenses.
5. The lidar compressed optical form in-line transceiver optical system of claim 4, wherein the transmitting lens assembly comprises a first convex lens, a first concave lens, and a second convex lens, the first concave lens, and the second convex lens being sequentially stacked.
6. The lidar compressed optical form coaxial transceiver optical system according to claim 4, wherein the transmitting optical unit further comprises a beam expander disposed at a front end of the transmitting lens assembly on the transmitting optical path, the beam expander is a concave lens, the beam expander is disposed coaxially with the transmitting lens assembly, and a diameter of the beam expander is smaller than a diameter of any one lens of the transmitting lens assembly.
7. The lidar compressed optical form coaxial transceiver optical system of claim 1, wherein the receiver lens assembly comprises a third convex lens, a corrector lens and a second concave lens, the third convex lens, the corrector lens and the second concave lens being coaxially arranged, the corrector lens being arranged between the third convex lens and the second concave lens, the corrector lens being a convex lens.
8. The lidar compressed optical form in-line transceiver optical system of claim 7, wherein the third convex lens is a plano-convex lens and the corrector lens is a biconvex lens.
9. The lidar compressed optical form coaxial light receiving and emitting optical system according to claim 1, wherein the light receiving and emitting optical system comprises an inner barrel, the emitting lens combination is disposed inside the inner barrel, and one end of the isolating device is abutted to one end of the inner barrel in an axial direction of an emitting optical path.
10. The lidar compressed optical form coaxial transceiver optical system of claim 1 or 9, wherein the isolation device is a light shielding tube made of carbon fiber.
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| CN202121353477.XU CN215297679U (en) | 2021-06-18 | 2021-06-18 | Laser radar compression optical program type coaxial light receiving and emitting optical system |
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| CN202121353477.XU CN215297679U (en) | 2021-06-18 | 2021-06-18 | Laser radar compression optical program type coaxial light receiving and emitting optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117907979A (en) * | 2024-03-20 | 2024-04-19 | 深圳大舜激光技术有限公司 | Remote wind-finding radar receiving and transmitting antenna |
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2021
- 2021-06-18 CN CN202121353477.XU patent/CN215297679U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117907979A (en) * | 2024-03-20 | 2024-04-19 | 深圳大舜激光技术有限公司 | Remote wind-finding radar receiving and transmitting antenna |
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