CN116880077A - Light spot shaping method and system for triangular radar transmitting light path - Google Patents

Light spot shaping method and system for triangular radar transmitting light path Download PDF

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Publication number
CN116880077A
CN116880077A CN202310997256.3A CN202310997256A CN116880077A CN 116880077 A CN116880077 A CN 116880077A CN 202310997256 A CN202310997256 A CN 202310997256A CN 116880077 A CN116880077 A CN 116880077A
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spot
light path
triangular
radar transmitting
focal length
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王品
季谋
龙杰
何英
吕星宏
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Shenzhen Eai Technology Co ltd
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Shenzhen Eai Technology Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/0012—Optical design, e.g. procedures, algorithms, optimisation routines
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
    • G02B27/0922—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers the semiconductor light source comprising an array of light emitters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

The application discloses a light spot shaping method and a system of a triangular radar transmitting light path, wherein the method comprises the following steps: calculating a first aspheric focal length according to the parameters of a spot shaping system of a triangular radar transmitting light path; calculating a divergence angle according to a refraction law and an elliptic equation formula; calculating the focal length of a light spot shaping system of a triangular radar transmitting light path according to a Gaussian beam collimation formula; and (3) using Zemax software to collimate the light source array and the laser secondary optics and shape the light source array to realize spot shaping. The application adopts the integral injection molding fixing mode of the plano-convex aspherical mirror, the module and the lens, and solves the problems of poor lens quasi-matching complexity and stability in the traditional laser radar. The light beam divergence of the light source array is utilized, and the light beam is finally regulated and focused through the collecting lens under the refraction action of the aspheric lens. The application of the innovative technical means brings important progress to the radar optical transceiver module technology, and is expected to play an important role in the laser radar field.

Description

Light spot shaping method and system for triangular radar transmitting light path
Technical Field
The application relates to the technical field of spot shaping, in particular to a spot shaping method and system of a triangular radar transmitting light path.
Background
Lidar is a device that uses a laser beam for ranging, and it can calculate the distance between a target object and the lidar by measuring the time required for the laser beam to reflect back from the transmitter to the target object. The triangle method laser radar ranging principle is to calculate the distance between the target object and the laser radar by utilizing the geometric relationship of triangles.
The basic idea of the triangle method laser radar ranging principle is as follows: when the laser radar emits a laser beam, the laser beam propagates in the air at the speed of light, and when the laser beam encounters a target object, a portion of the laser beam is reflected back by the target object and is received by the laser radar receiver. By measuring the time required for the laser beam to reflect back from the transmitter to the target object, the distance between the target object and the lidar can be calculated.
In the principle of triangulation lidar ranging, the distance between a target object and the lidar needs to be calculated using the geometric relationship of triangles. In particular, it is necessary to measure the distance of the laser beam from the transmitter to the target object, the distance of the laser beam from the receiver to the target object, and the distance between the lidar transmitter and the receiver. By measuring these distances, the distance between the target object and the lidar can be calculated using the geometric relationship of the triangle.
The triangle method laser radar ranging principle has the advantages of high precision, wide measuring range, high measuring speed and the like, so that the triangle method laser radar ranging principle is widely applied to the fields of robot navigation, automatic driving, industrial automation and the like. Meanwhile, with the continuous development of laser radar technology, the triangle method laser radar ranging principle is also continuously perfected and optimized, and a more reliable and efficient ranging scheme is provided for the application in various fields.
The current triangular laser radar basically uses EEL as a laser emission source, and the Gaussian beam quality instability technology of a light source is updated and iterated slowly. The technology development of VCSELs is stronger than that of conventional EELs. The light power of the light spot energy after the collimation of the triangular range radar is more than 70%, and the light spot area has strict requirements. So that the optimized adjustment of the light spot under the condition achieves a functional implementation of the triangulation.
Disclosure of Invention
The application aims to provide a light spot shaping method and a light spot shaping system for a triangular radar transmitting light path, which realize high-power small light spots by adopting a light source array and performing collimation and shaping by laser secondary optics.
The first aspect of the application provides a light spot shaping method of a triangular radar transmitting light path, which comprises the following steps:
referring to fig. 1, a flow chart of spot shaping of a triangular radar transmitting light path according to some embodiments of the present application is shown.
As shown in fig. 1, the application discloses a spot shaping method of a triangular radar transmitting light path, which comprises the following steps:
calculating a first aspheric focal length according to the parameters of a spot shaping system of a triangular radar transmitting light path;
calculating a divergence angle according to a refraction law and an elliptic equation formula;
calculating the focal length of a light spot shaping system of a triangular radar transmitting light path according to a Gaussian beam collimation formula;
and (3) using Zemax software to collimate the light source array and the laser secondary optics and shape the light source array to realize spot shaping.
It should be noted that, the spot shaping system of the triangular radar transmitting light path is a key device for adjusting and changing the beam shape. The light spot shaping system mainly comprises a light source array, an aspheric lens, a condenser lens and other components. The light beam divergence of the light source array is utilized, and the light beam is finally regulated and focused through the collecting lens under the refraction action of the aspheric lens.
Optionally, calculating a first aspheric focal length according to a light spot shaping system parameter of a triangular radar emission light path, wherein a calculation formula is as follows:
；
wherein ,for the first aspheric focal length, < >>Is refractive index. />For a first radius of curvature->Is a second radius of curvature.
It should be noted that, focal length calculation of the aspherical lens is an important step in calculation of parameters of the spot shaping system. When calculating the aspheric focal length, we can use geometrical optics method and combine the mathematical model and parameters of the aspheric lens to derive. The application can refer to the existing aspheric lens design method and formula, such as the aspheric general formula proposed by Seymour et al. The application adopts a calculation formulaAnd (5) performing calculation.
Optionally, the divergence angle is calculated according to a refraction law and an elliptic equation formula, and the calculation formula is as follows:
；
；
；
；
wherein ,for incident angle, ++>For the emergence angle, X is the spot abscissa, Y is the spot ordinate, +.>For the length of the spot on the abscissa, +.>Length of the ordinate of the light spot, +.>Is a divergence angle>For wavelength, < >>Is the radius of the girdle, is>Is of radius of curvature->Is a curvature coefficient.
In order to accurately calculate the normal angle of the triangular radar transmitting light path, it is necessary to know the refraction law and the application range thereof. The law of refraction describes the behavior of light rays as they enter one medium from another.
The elliptic equation formula needs to be derived before calculating the dispersion angle. Elliptic equations can be used to describe the characteristics of the aspherical surfaces such as paraboloids, hyperboloids, and ellipsoids. First, we need to know the basic form of an elliptic equation, and then we can get an elliptic equation formula describing the focal length of the aspherical surface by appropriately transforming and deriving this equation.
In calculating the divergence angle, we can use the derived refractive law and elliptic equation formulas. First, we can calculate the refraction angle, which is determined by the angle of incidence and the refractive index of the incident medium, according to the law of refraction. Then, by using an elliptic equation formula, we can calculate elliptic equation parameters corresponding to the aspheric focal length. Finally, by calculating the parameters, we can obtain the normal angle of the triangular radar emission light path.
Optionally, the focal length of the spot shaping system of the triangular radar transmitting light path is calculated according to a gaussian beam collimation formula, and the calculation formula is as follows:
；
wherein ,the focal length of the spot shaping system of the triangular radar transmitting light path.
It should be noted that the whole frame of the application adopts a similar triangle method to realize distance measurement. The method utilizes the geometrical relationship of similar triangles, and can calculate the distance of a target object by measuring the angle and the distance of light rays. Compared with the traditional distance measurement method, the similar triangle method simplifies the light path design and can obtain imaging results with higher quality. The ranging method has wide application prospect in laser radar application.
In addition, to verify the effect of the design, the solution uses Zemax software for optical simulation. Through simulation analysis, the performance of the optical system can be evaluated and the design parameters can be optimized. By continuously adjusting the curvature and the inclination angle of the aspherical mirror, the optimal imaging effect and ranging accuracy can be obtained.
The second aspect of the application discloses a spot shaping system of a triangular radar transmitting light path; the system comprises: a light source, a collimating lens, a memory and a processor;
the memory comprises a program of a spot shaping method of a triangular radar transmitting light path;
the processor is used for controlling the light source to emit a light path to the collimating lens;
and the processor also realizes the control of the alignment lens according to the light spot shaping method of the triangular radar transmitting light path.
It should be noted that the design scheme of the shaping system of the triangular radar transmitting light path has important application value in the laser radar optical field. By adopting the integral injection molding fixing mode of the plano-convex aspherical mirror, the module and the lens, the scheme solves the problems of poor lens quasi-matching complexity and stability in the traditional laser radar, and brings important progress to the optical transceiver module technology.
Optionally, the light source adopts an array light source.
Optionally, the light source is an LED light source, or an EEL light source, or a VCSEL light source.
Optionally, the collimating lens comprises at least two aspherical mirrors.
In the present application, a plano-convex aspherical mirror is used as a focusing lens instead of the conventional multiple-unit glass lens. This design not only simplifies the complexity of the construction of the optical path, but also improves the imaging quality. By reasonably selecting the aspherical curvature, the focusing of the laser can be realized, so that a clear imaging result is obtained.
In order to ensure the stability of the optical system, the application adopts an integral injection molding fixing mode of the module and the lens. By integrally fixing the module and the lens, the influence of assembly errors on the system performance can be reduced. The fixing mode not only simplifies the assembly process, but also improves the stability and reliability of the system.
In the present application, the collimated light path is placed on the optical image point of the collimation system by the laser light source. The laser source is essentially a gaussian beam and is collimated by a point source that is considered ideal in the system. The plano-convex aspheric mirror surface can be roughly used for collimation of a laser light source, but has great influence on performance when applied to a triangular ranging system. The triangular ranging system has strict requirements on light spots after collimation of the laser. The light spot is not easily oversized and the energy is concentrated enough. The additional diaphragm can reduce light spots on a physical level, but the energy is also relatively reduced, so that the method is not suitable for testing a long-distance and high-precision triangular range radar. In order not to affect the ranging performance, multiple aspherical mirrors may be used to collimate the system light source. The collimated light spot and energy can meet the triangular ranging performance.
Optionally, the collimating lens comprises two aspherical mirrors.
According to the embodiment of the application, the system can realize the following method steps:
calculating the focal length of a first aspheric mirror according to the parameters of a spot shaping system of a triangular radar transmitting light path;
calculating a divergence angle according to a refraction law and an elliptic equation formula;
calculating the focal length of the collimating lens according to a Gaussian beam collimation formula;
and (3) using Zemax software to collimate the light source array and the laser secondary optics and shape the light source array to realize spot shaping.
The first aspheric focal length is calculated according to the parameters of the spot shaping system of the triangular radar transmitting light path, and the calculation formula is as follows:
；
wherein ,for the first aspheric focal length, < >>Is refractive index. />For a first radius of curvature->Is a second radius of curvature;
the divergence angle is calculated according to a refraction law and an elliptic equation formula, and the calculation formula is as follows:
；
；
；
；
wherein ,for incident angle, ++>For the emergence angle, X is the spot abscissa, Y is the spot ordinate, +.>For the length of the spot on the abscissa, +.>Length of the ordinate of the light spot, +.>Is a divergence angle>For wavelength, < >>Is the radius of the girdle, is>Is of radius of curvature->Is a curvature coefficient;
according to the Gaussian beam collimation formula, the focal length of a spot shaping system of a triangular radar transmitting light path is calculated, and the calculation formula is as follows:
；
wherein ,the focal length of the spot shaping system of the triangular radar transmitting light path.
As can be seen from the above, the spot shaping method and system for the triangular radar transmitting light path provided by the application solve the problems of poor lens quasi-matching complexity and stability in the traditional laser radar by adopting the integral injection fixing mode of the plano-convex aspherical mirror and the module and the lens through the triangular radar transmitting light path. The light beam divergence of the light source array is utilized, and the light beam is finally regulated and focused through the collecting lens under the refraction action of the aspheric lens. The application of the innovative technical means brings important progress to the radar optical transceiver module technology, and is expected to play an important role in the laser radar field.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims thereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for shaping a light spot of a triangular radar transmitting light path according to an embodiment of the present application.
Fig. 2 is a block diagram of a spot shaping system of a triangular radar transmitting light path according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a collimation optical path according to an embodiment of the present application.
In the figure: the system comprises a light spot shaping system of a 2-triangle radar emission light path, a 21-memory, a 22-processor, a 23-light source, a 24-collimating lens and a 25-aspheric mirror.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that like reference numerals and letters refer to like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Referring to fig. 1, a flow chart of a method for shaping a light spot of a triangular radar transmitting light path according to some embodiments of the present application is shown.
As shown in fig. 1, the application discloses a spot shaping method of a triangular radar transmitting light path, which comprises the following steps:
s102: calculating a first aspheric focal length according to the parameters of a spot shaping system of a triangular radar transmitting light path;
s104: calculating a divergence angle according to a refraction law and an elliptic equation formula;
s106: calculating the focal length of a light spot shaping system of a triangular radar transmitting light path according to a Gaussian beam collimation formula;
s108: and (3) using Zemax software to collimate the light source array and the laser secondary optics and shape the light source array to realize spot shaping.
It should be noted that, the spot shaping system of the triangular radar transmitting light path is a key device for adjusting and changing the beam shape. The light spot shaping system mainly comprises a light source array, an aspheric lens, a condenser lens and other components. The light beam divergence of the light source array is utilized, and the light beam is finally regulated and focused through the collecting lens under the refraction action of the aspheric lens.
According to the embodiment of the application, the first aspheric focal length is calculated according to the parameters of the spot shaping system of the triangular radar transmitting light path, and the calculation formula is as follows:
；
wherein ,for the first aspheric focal length, < >>Is refractive index. />For a first radius of curvature->Is a second radius of curvature.
It should be noted that, focal length calculation of the aspherical lens is an important step in calculation of parameters of the spot shaping system. When calculating the aspheric focal length, we can use geometrical optics method and combine the mathematical model and parameters of the aspheric lens to derive. The application can refer to the existing aspheric lens design method and formula, such as the aspheric general formula proposed by Seymour et al. The application adopts a calculation formulaAnd (5) performing calculation.
According to the embodiment of the application, the divergence angle is calculated according to the refraction law and the elliptic equation formula, and the calculation formula is as follows:
；
；
；
；
wherein ,for incident angle, ++>For the emergence angle, X is the spot abscissa, Y is the spot ordinate, +.>For the length of the spot on the abscissa, +.>Length of the ordinate of the light spot, +.>Is a divergence angle>For wavelength, < >>Is the radius of the girdle, is>Is of radius of curvature->Is a curvature coefficient.
In order to accurately calculate the normal angle of the triangular radar transmitting light path, it is necessary to know the refraction law and the application range thereof. The law of refraction describes the behavior of light rays as they enter one medium from another.
The elliptic equation formula needs to be derived before calculating the dispersion angle. Elliptic equations can be used to describe the characteristics of the aspherical surfaces such as paraboloids, hyperboloids, and ellipsoids. First, we need to know the basic form of an elliptic equation, and then we can get an elliptic equation formula describing the focal length of the aspherical surface by appropriately transforming and deriving this equation.
In calculating the divergence angle, we can use the derived refractive law and elliptic equation formulas. First, we can calculate the refraction angle, which is determined by the angle of incidence and the refractive index of the incident medium, according to the law of refraction. Then, by using an elliptic equation formula, we can calculate elliptic equation parameters corresponding to the aspheric focal length. Finally, by calculating the parameters, we can obtain the normal angle of the triangular radar emission light path.
According to the embodiment of the application, the focal length of the spot shaping system of the triangular radar transmitting light path is calculated according to a Gaussian beam collimation formula, and the calculation formula is as follows:
；
wherein ,the focal length of the spot shaping system of the triangular radar transmitting light path.
It should be noted that the whole frame of the application adopts a similar triangle method to realize distance measurement. The method utilizes the geometrical relationship of similar triangles, and can calculate the distance of a target object by measuring the angle and the distance of light rays. Compared with the traditional distance measurement method, the similar triangle method simplifies the light path design and can obtain imaging results with higher quality. The ranging method has wide application prospect in laser radar application.
In addition, to verify the effect of the design, the solution uses Zemax software for optical simulation. Through simulation analysis, the performance of the optical system can be evaluated and the design parameters can be optimized. By continuously adjusting the curvature and the inclination angle of the aspherical mirror, the optimal imaging effect and ranging accuracy can be obtained.
As shown in fig. 2, the application discloses a spot shaping system of a triangular radar emission light path; the spot shaping system 2 of the triangular radar transmitting light path comprises: a light source 23, a collimator lens 24, a memory 21, and a processor 22;
the memory 21 includes a program of a spot shaping method of a triangular radar transmitting light path;
the processor 22 is used for controlling the light source 23 to emit a light path to the collimating lens 24;
the processor also controls the alignment lens 24 according to the spot shaping method of the triangular radar transmitting light path.
It should be noted that the design scheme of the shaping system of the triangular radar transmitting light path has important application value in the laser radar optical field. By adopting the integral injection molding fixing mode of the plano-convex aspherical mirror, the module and the lens, the scheme solves the problems of poor lens quasi-matching complexity and stability in the traditional laser radar, and brings important progress to the optical transceiver module technology.
According to an embodiment of the present application, the light source 23 is an array light source.
According to an embodiment of the present application, the light source 23 is an LED light source, or an EEL light source, or a VCSEL light source.
According to an embodiment of the present application, the collimating lens 24 comprises at least two aspherical mirrors 25.
In the present application, the aspherical mirror 25 having a plano-convex shape is used as a focusing lens instead of the conventional lens array. This design not only simplifies the complexity of the construction of the optical path, but also improves the imaging quality. By reasonably selecting the aspherical curvature, the focusing of the laser can be realized, so that a clear imaging result is obtained.
In order to ensure the stability of the optical system, the application adopts an integral injection molding fixing mode of the module and the lens. By integrally fixing the module and the lens, the influence of assembly errors on the system performance can be reduced. The fixing mode not only simplifies the assembly process, but also improves the stability and reliability of the system.
In the present application, the collimated light path is placed on the optical image point of the collimation system by the laser light source. The laser source is essentially a gaussian beam and is collimated by a point source that is considered ideal in the system. Plano-convex aspherical mirror 25 may be roughened to collimate the laser light source, but application to a triangulation system has a significant impact on performance. The triangular ranging system has strict requirements on light spots after collimation of the laser. The light spot is not easily oversized and the energy is concentrated enough. The additional diaphragm can reduce light spots on a physical level, but the energy is also relatively reduced, so that the method is not suitable for testing a long-distance and high-precision triangular range radar. In order not to affect the ranging performance, multiple aspherical mirrors 25 may be used to collimate the system light source. The collimated light spot and energy can meet the triangular ranging performance.
According to an embodiment of the present application, as a specific embodiment, the collimating lens in this embodiment includes two aspherical mirrors. The collimating lens of the application consists of two aspheric mirrors, and the collimating light path is shown in figure 3.
According to the embodiment of the application, the system can realize the following method steps:
s102: calculating the focal length of a first aspheric mirror according to the parameters of a spot shaping system of a triangular radar transmitting light path;
s104: calculating a divergence angle according to a refraction law and an elliptic equation formula;
s106: calculating the focal length of the collimating lens according to a Gaussian beam collimation formula;
s108: the Zemax software is adopted to collimate and shape the light source array and the laser secondary optics so as to realize the light spot shaping;
it should be noted that, the spot shaping system of the triangular radar transmitting light path is a key device for adjusting and changing the beam shape. The light spot shaping system mainly comprises a light source array, an aspheric lens, a condenser lens and other components. The light beam divergence of the light source array is utilized, and the light beam is finally regulated and focused through the collecting lens under the refraction action of the aspheric lens.
The first aspheric focal length is calculated according to the parameters of the spot shaping system of the triangular radar transmitting light path, and the calculation formula is as follows:
；
wherein ,for the first aspheric focal length, < >>Is refractive index. />For a first radius of curvature->Is a second radius of curvature;
it should be noted that, focal length calculation of the aspherical lens is an important step in calculation of parameters of the spot shaping system. When calculating the aspheric focal length, we can use geometrical optics method and combine the mathematical model and parameters of the aspheric lens to derive. The application can refer to the existing aspheric lens design method and formula, such as the aspheric general formula proposed by Seymour et al. The application adopts a calculation formulaAnd (5) performing calculation.
The divergence angle is calculated according to a refraction law and an elliptic equation formula, and the calculation formula is as follows:
；
；
；
；
wherein ,for incident angle, ++>For the emergence angle, X is the spot abscissa, Y is the spot ordinate, +.>For the length of the spot on the abscissa, +.>Length of the ordinate of the light spot, +.>Is a divergence angle>For wavelength, < >>Is the radius of the girdle, is>Is of radius of curvature->Is a curvature coefficient;
in order to accurately calculate the normal angle of the triangular radar transmitting light path, it is necessary to know the refraction law and the application range thereof. The law of refraction describes the behavior of light rays as they enter one medium from another.
The elliptic equation formula needs to be derived before calculating the dispersion angle. Elliptic equations can be used to describe the characteristics of the aspherical surfaces such as paraboloids, hyperboloids, and ellipsoids. First, we need to know the basic form of an elliptic equation, and then we can get an elliptic equation formula describing the focal length of the aspherical surface by appropriately transforming and deriving this equation.
In calculating the divergence angle, we can use the derived refractive law and elliptic equation formulas. First, we can calculate the refraction angle, which is determined by the angle of incidence and the refractive index of the incident medium, according to the law of refraction. Then, by using an elliptic equation formula, we can calculate elliptic equation parameters corresponding to the aspheric focal length. Finally, by calculating the parameters, we can obtain the normal angle of the triangular radar emission light path.
According to the Gaussian beam collimation formula, the focal length of a spot shaping system of a triangular radar transmitting light path is calculated, and the calculation formula is as follows:
；
wherein ,the focal length of the spot shaping system of the triangular radar transmitting light path.
It should be noted that the whole frame of the application adopts a similar triangle method to realize distance measurement. The method utilizes the geometrical relationship of similar triangles, and can calculate the distance of a target object by measuring the angle and the distance of light rays. Compared with the traditional distance measurement method, the similar triangle method simplifies the light path design and can obtain imaging results with higher quality. The ranging method has wide application prospect in laser radar application.
In addition, to verify the effect of the design, the solution uses Zemax software for optical simulation. Through simulation analysis, the performance of the optical system can be evaluated and the design parameters can be optimized. By continuously adjusting the curvature and the inclination angle of the aspherical mirror, the optimal imaging effect and ranging accuracy can be obtained.
As can be seen from the above, the spot shaping method and system for the triangular radar transmitting light path provided by the application solve the problems of poor lens quasi-matching complexity and stability in the traditional laser radar by adopting the integral injection fixing mode of the plano-convex aspherical mirror and the module and the lens through the triangular radar transmitting light path. The light beam divergence of the light source array is utilized, and the light beam is finally regulated and focused through the collecting lens under the refraction action of the aspheric lens. The application of the innovative technical means brings important progress to the radar optical transceiver module technology, and is expected to play an important role in the laser radar field.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.
The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units; can be located in one place or distributed to a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.
Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk or an optical disk, or the like, which can store program codes.
Alternatively, the above-described integrated units of the present application may be stored in a readable storage medium if implemented in the form of software functional modules and sold or used as separate products. Based on such understanding, the technical solution of the embodiments of the present application may be embodied in essence or a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a removable storage device, ROM, RAM, magnetic or optical disk, or other medium capable of storing program code.

Claims (10)

1. A method for shaping a light spot of a triangular radar transmitting light path, the method comprising the steps of:
calculating a first aspheric focal length according to the parameters of a spot shaping system of a triangular radar transmitting light path;
calculating a divergence angle according to a refraction law and an elliptic equation formula;
calculating the focal length of a light spot shaping system of a triangular radar transmitting light path according to a Gaussian beam collimation formula;
and (3) using Zemax software to collimate the light source array and the laser secondary optics and shape the light source array to realize spot shaping.
2. The method for shaping a light spot of a triangular radar transmitting light path according to claim 1, wherein the first aspheric focal length is calculated according to a light spot shaping system parameter of the triangular radar transmitting light path, and the calculation formula is as follows:
；
wherein ,for the first aspheric focal length, < >>Is refractive index; />For a first radius of curvature->Is a second radius of curvature.
3. The method for shaping the light spot of the triangular radar transmitting light path according to claim 2, wherein the divergence angle is calculated according to a refraction law and an elliptic equation formula, and the calculation formula is as follows:
；
；
；
；
wherein ,for incident angle, ++>For the emergence angle, X is the spot abscissa, Y is the spot ordinate, +.>For the length of the spot on the abscissa, +.>Length of the ordinate of the light spot, +.>Is a divergence angle>For wavelength, < >>Is the radius of the girdle, is>Is of radius of curvature->Is a curvature coefficient.
4. A method for shaping a light spot of a triangular radar transmitting light path according to claim 3, wherein the focal length of a light spot shaping system of the triangular radar transmitting light path is calculated according to a gaussian beam collimation formula, and the calculation formula is as follows:
；
wherein ,light spot integration for triangular radar transmitting light pathForm a system focal length.
5. A spot shaping system for a triangular radar transmit path, the system comprising: a light source, a collimating lens, a memory and a processor;
the memory comprises a program of a spot shaping method of a triangular radar transmitting light path;
the processor is used for controlling the light source to emit a light path to the collimating lens;
and the processor also realizes the control of the alignment lens according to the light spot shaping method of the triangular radar transmitting light path.
6. The spot shaping system of claim 5 wherein the light source is an array light source.
7. The spot shaping system of claim 6 wherein the light source is an LED light source, an EEL light source, or a VCSEL light source.
8. The spot shaping system of claim 7 wherein the collimating lens comprises at least two aspherical mirrors.
9. The spot shaping system of claim 8 wherein the collimating lens comprises two aspherical mirrors.
10. A spot shaping system for a triangular radar transmit beam path according to claim 9, wherein the system is adapted to perform the method steps of:
calculating the focal length of a first aspheric mirror according to the parameters of a spot shaping system of a triangular radar transmitting light path;
calculating a divergence angle according to a refraction law and an elliptic equation formula;
calculating the focal length of the collimating lens according to a Gaussian beam collimation formula;
the Zemax software is adopted to collimate and shape the light source array and the laser secondary optics so as to realize the light spot shaping;
the first aspheric focal length is calculated according to the parameters of the spot shaping system of the triangular radar transmitting light path, and the calculation formula is as follows:
；
wherein ,for the first aspheric focal length, < >>Is refractive index; />For a first radius of curvature->Is a second radius of curvature;
the divergence angle is calculated according to a refraction law and an elliptic equation formula, and the calculation formula is as follows:
；
；
；
；
wherein ,for incident angle, ++>For the emergence angle, X is the spot abscissa, Y is the spot ordinate, +.>For the length of the spot on the abscissa, +.>Length of the ordinate of the light spot, +.>Is a divergence angle>For wavelength, < >>Is the radius of the girdle, is>Is of radius of curvature->Is a curvature coefficient;
according to the Gaussian beam collimation formula, the focal length of a spot shaping system of a triangular radar transmitting light path is calculated, and the calculation formula is as follows:
；
wherein ,the focal length of the spot shaping system of the triangular radar transmitting light path.
CN202310997256.3A 2023-08-09 2023-08-09 Light spot shaping method and system for triangular radar transmitting light path Pending CN116880077A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160274368A1 (en) * 2015-03-16 2016-09-22 Igor Gurevich Beam shaper system for laser diode array
CN217425688U (en) * 2022-04-27 2022-09-13 深圳玩智商科技有限公司 Optical lens, laser emission system, and laser transmitter/receiver
WO2023015562A1 (en) * 2021-08-13 2023-02-16 华为技术有限公司 Lidar and terminal device
CN116224297A (en) * 2023-05-08 2023-06-06 山东鼎瞰智能科技发展有限公司 Remote laser ranging system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160274368A1 (en) * 2015-03-16 2016-09-22 Igor Gurevich Beam shaper system for laser diode array
WO2023015562A1 (en) * 2021-08-13 2023-02-16 华为技术有限公司 Lidar and terminal device
CN217425688U (en) * 2022-04-27 2022-09-13 深圳玩智商科技有限公司 Optical lens, laser emission system, and laser transmitter/receiver
CN116224297A (en) * 2023-05-08 2023-06-06 山东鼎瞰智能科技发展有限公司 Remote laser ranging system

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