CN211123268U - Device for increasing range finding dynamic range of laser radar - Google Patents

Abstract

The embodiment of the application relates to a device for increasing the range finding dynamic range of a laser radar, comprising: emission subassembly, receiving element, gradual change decay piece, actuating mechanism, emission subassembly, gradual change decay piece set up on the transmission light path, receiving element sets up on receiving the light path, emission subassembly emergent light, emergent light shine on the target object behind the gradual change decay piece, actuating mechanism drive gradual change decay piece displacement, gradual change decay piece attenuation ratio along with the displacement gradual change. The embodiment of the application sets up a gradual change decay piece on emission light path, and emergent light shines the target object behind the gradual change decay piece on, through a actuating mechanism drive gradual change decay piece displacement, and gradual change decay piece attenuation ratio reduces emergent light intensity along with displacement gradual change, and then reduces the reverberation light intensity, makes receiving assembly be in the unsaturated state.

Description

Device for increasing range finding dynamic range of laser radar

Technical Field

The utility model relates to a laser radar adjusting device especially relates to an increase laser radar range finding dynamic range's device.

Background

Lidar is often used to detect targets at different distances over a wide area, and therefore requires the simultaneous reception of far and near echo signals, and the receiver requires a high dynamic range, i.e. a large ratio between the farthest distance and the closest distance. The dynamic range of ranging is small, and it may occur that a radar that measures far is generally not able to measure near, or that a radar that measures near is generally difficult to measure far. The dynamic range of laser radar ranging is limited by far and near signal detection.

In the short-distance signal detection, a system optical blind area exists, namely when the transmitting and receiving are not coaxially designed, the transmitting and receiving view fields are not overlapped in a short distance, the area detected by the transmitted light beam is not covered by the receiving view field, so that a distance value cannot be obtained, and the short-distance signal detection has the problems of signal light intensity and over-exposure blind area.

In long-distance signal detection, the requirements on the utilization efficiency of an optical system of a radar system, the light output power or the photosensitive threshold value of a receiving device are high, the radar system usually needs strong signal light, but in short-distance signal detection, the radar system can enable the receiving device to be overexposed due to the fact that the signal light is too strong, the near distance cannot be measured, and therefore the range of a short-distance overexposure blind area is enlarged.

How to solve the problem that the overexposure blind area exists in the long-distance and short-distance signal detection and the problem that the increase of the range-finding dynamic range of the laser radar become the consideration of the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a moving target car motion control system based on laser radar, and solves the problems of unstable distance measurement and complex implementation in the prior art.

In one aspect, an apparatus for increasing a dynamic range of lidar ranging, comprising: emission subassembly, receiving element, gradual change decay piece, actuating mechanism, emission subassembly, gradual change decay piece set up on emission light path, receiving element sets up on receiving light path, emission subassembly emergent light, emergent light shine on the target object behind the gradual change decay piece after, target object reverberation gets into receiving element, actuating mechanism drive gradual change decay piece displacement, gradual change decay piece attenuation ratio along with the displacement gradual change.

In one possible implementation, the driving mechanism drives the gradual attenuation piece to rotate or translate.

In a possible implementation manner, when the driving mechanism drives the gradual attenuation piece to rotate, the gradual attenuation piece rotates around a self rotating shaft, the attenuation proportion gradually changes along with the rotation, and the attenuation proportion is 0-100%.

In a possible implementation manner, when the driving mechanism drives the gradual attenuation piece to translate, the gradual attenuation piece gradually changes along with the translation, and the attenuation ratio is 0-100%.

In a possible implementation manner, a diffuse scattering sheet or a light homogenizing sheet is arranged on the gradual change attenuation sheet and used for expanding the divergence angle.

In a possible implementation, the proportion of the diffuse scattering sheet or the dodging sheet in the gradual attenuation sheet is 5-20%.

In a possible implementation manner, the driving mechanism is a motor or a steering engine.

In a possible implementation manner, the apparatus for increasing the dynamic range of lidar ranging further includes an adjusting mechanism, the transmitting assembly includes a transmitting lens, and the adjusting mechanism is configured to adjust an axial distance between the transmitting assembly and the receiving assembly, or adjust a position of an optical axis of the transmitting lens relative to the receiving assembly.

In a possible implementation mode, the adjusting mechanism is in contact with the transmitting assembly and pushes the whole transmitting assembly to approach the receiving assembly, so that the wheelbase of the transmitting assembly and the receiving assembly is adjusted.

In a possible implementation manner, the adjusting mechanism is in contact with the transmitting lens, pushes the transmitting lens to approach the receiving assembly, and adjusts the position of the optical axis of the transmitting lens relative to the receiving assembly.

This application embodiment sets up a gradual change decay piece on transmission light path, emergent light shines on the target object behind the gradual change decay piece, through a actuating mechanism drive gradual change decay piece displacement, gradual change decay piece attenuation proportion reduces the emergent light intensity along with the displacement gradual change, and then reduces the reverberation light intensity, makes receiving assembly be in the unsaturated state, and laser radar has eliminated long-range, closely the signal detection overexposure blind area that exists when accomplishing normal range finding, increases laser radar range finding dynamic range.

Drawings

Fig. 1 is a front view of an embodiment of the present application.

FIG. 2 is a schematic view of a graded attenuator sheet having a diffuse reflection sheet according to an embodiment of the present application.

FIG. 3 is a schematic diagram of a graded attenuator sheet with a light homogenizer according to an embodiment of the present application.

FIG. 4 is a schematic view of an adjustment mechanism adjusting the firing assembly according to an embodiment of the present application.

FIG. 5 is a schematic diagram of an adjusting mechanism for adjusting the emitting lens according to an embodiment of the present application.

In the figure: 1. a transmitting assembly; 2. a receiving component; 3. a gradual attenuation sheet; 4. a drive mechanism; 5. a diffuse scattering sheet; 6. light homogenizing; 7. an adjustment mechanism; 11. an emission lens.

Detailed Description

The technical scheme of the application is further explained by the specific implementation mode in combination with the attached drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.

As shown in fig. 1, an apparatus for increasing the dynamic range of lidar ranging includes: emission subassembly 1, receiving assembly 2, gradual change decay piece 3, actuating mechanism 4, emission subassembly 1, gradual change decay piece 3 set up on the transmission light path, receiving assembly 2 sets up on receiving the light path, the emergent light of emission subassembly 1, emergent light shines on the target object after 3 gradual change decay pieces, target object reverberation gets into receiving assembly 2, actuating mechanism 4 drive 3 displacements of gradual change decay piece, 3 attenuation proportions of gradual change decay pieces along with the displacement gradual change.

This application embodiment sets up a gradual change decay piece 3 on the transmission light path, emergent light shines on the target object after 3 gradual change decay pieces, through 3 displacements of a actuating mechanism 4 drive gradual change decay pieces, 3 attenuation proportion of gradual change decay piece are along with the displacement gradual change, reduce emergent light intensity, and then reduce reflected light intensity, make receiving element 2 be in the unsaturated state, normal range finding can be accomplished to laser radar 1, long distance has been eliminated, the blind area of overexposure that closely signal detection exists, increase 1 range finding dynamic range of laser radar.

In fig. 1, the driving mechanism 4 drives the rotation of the gradation damping sheet 3.

As shown in fig. 1, the shape of the attenuation gradation sheet 3 is a ring shape, and the drive mechanism 4 drives the ring-shaped attenuation gradation sheet to rotate.

When the driving mechanism 4 drives the gradual attenuation piece 3 to rotate, the gradual attenuation piece 3 rotates around a self rotating shaft, the attenuation proportion gradually changes along with the rotation, and the attenuation proportion is 0-100%.

The gradual attenuation sheet 3 is annular, one circle is 360 degrees and can be divided into 60 sectors, each sector is 6 degrees, the attenuation rate of each sector is different from 0-100 percent, and the attenuation rate of each sector is set according to actual requirements from small to large.

The gradual attenuation sheet 3 may be a completely gradual ring, and the gradual coefficient is 1/360 increase per degree of attenuation rate.

As shown in fig. 3, when the driving mechanism 4 drives the gradual attenuation sheet 3 to translate, the gradual attenuation sheet 3 gradually changes with the translation, and the attenuation ratio is 0-100%.

The gradual attenuation piece 3 is rectangular, and the length of the gradual attenuation piece 3 is 10-100 mm.

As shown in fig. 2, a diffuse scattering sheet 5 is arranged on the gradual attenuation sheet 3; as shown in fig. 3, the graded attenuation sheet 3 is provided with a dodging sheet 6, and the diffuse scattering sheet 5 or the dodging sheet 6 is used for enlarging the divergence angle.

The diffusing sheet 5 or the light uniformizing sheet 6 may reflect the outgoing light in all directions. After a target enters an optical blind area, namely a receiving-transmitting view field non-coincident area, adjusting a gradual change attenuation sheet 3 until a diffuse scattering sheet 5 or a light homogenizing sheet 6 is positioned on a transmitting light path, enabling emergent light to enter the diffuse scattering sheet 5 or the light homogenizing sheet 6 and then be reflected towards all directions, enabling the transmitting view field to be greatly expanded, and enabling the emergent light to be dispersed to a front maximum view field to ensure that a receiving view field is covered, so that the optical blind area is reduced or eliminated;

the proportion of the diffuse scattering sheet 5 or the dodging sheet 6 in the gradual attenuation sheet 3 is 5-20%.

The proportion of the diffuse scattering sheet 5 or the dodging sheet 6 can be adjusted according to actual requirements.

The driving mechanism 4 is a motor or a steering engine.

The device for increasing the range finding dynamic range of the laser radar further comprises an adjusting mechanism 7, the transmitting component 1 comprises a transmitting lens 11, and the adjusting mechanism 7 is used for adjusting the axle distance between the transmitting component 1 and the receiving component 2 or adjusting the position of the optical axis of the transmitting lens 11 relative to the receiving component 2.

As shown in FIG. 4, the adjusting mechanism 7 is in contact with the launching assembly 1, and pushes the whole launching assembly 1 to approach the receiving assembly 2, so as to adjust the wheelbase of the launching assembly 1 and the receiving assembly 2.

The adjustment mechanism 7 moves the optical axis of the whole of the radiation module 1 in parallel, requiring the whole of the radiation lens and hardware to move together, with a constant divergence angle.

As shown in fig. 5, the adjusting mechanism 7 contacts the transmitting lens 8, pushes the transmitting lens 11 to approach the receiving module 2, and adjusts the position of the optical axis of the transmitting lens 8 relative to the receiving module 2.

The scheme only moves the transmitting lens 11, other hardware is not moved, the part needing to be moved is smaller, the structure is simpler, but the divergence angle of the light spots at the near position can be influenced, and further the field of view at the near position is influenced.

The technical principles of the present application have been described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the present application and is not to be construed in any way as limiting the scope of the application. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present application without inventive effort, which shall fall within the scope of the present application.

Claims (10)

1. An apparatus for increasing the dynamic range of lidar ranging, comprising: emission subassembly, receiving element, gradual change decay piece, actuating mechanism, emission subassembly, gradual change decay piece set up on emission light path, receiving element sets up on receiving light path, emission subassembly emergent light, emergent light shine on the target object behind the gradual change decay piece after, target object reverberation gets into receiving element, actuating mechanism drive gradual change decay piece displacement, gradual change decay piece attenuation ratio along with the displacement gradual change.

2. The apparatus of claim 1, wherein the driving mechanism drives the graduated damping plate to rotate or translate.

3. The device for increasing the dynamic range of lidar ranging according to claim 2, wherein when the driving mechanism drives the gradual attenuation plate to rotate, the gradual attenuation plate rotates around its own rotation axis, the attenuation ratio gradually changes with the rotation, and the attenuation ratio is 0-100%.

4. The apparatus according to claim 2, wherein when the driving mechanism drives the gradual attenuation plate to translate, the gradual attenuation plate gradually changes with the translation, and the attenuation ratio is 0-100%.

5. The device for increasing the dynamic range of lidar ranging according to claim 4, wherein the gradual attenuation sheet is provided with a diffuse scattering sheet or a uniform light sheet for enlarging the divergence angle.

6. The apparatus of claim 5, wherein the diffuse scattering plate or the dodging plate accounts for 5-20% of the gradual attenuation plate.

7. The device for increasing the dynamic range of lidar ranging according to claim 6, wherein the driving mechanism is a motor or a steering engine.

8. The apparatus of claim 7, further comprising an adjusting mechanism, wherein the transmitting assembly comprises a transmitting lens, and the adjusting mechanism is used for adjusting the distance between the transmitting assembly and the receiving assembly or adjusting the position of the optical axis of the transmitting lens relative to the receiving assembly.

9. The apparatus of claim 8, wherein the adjustment mechanism is in contact with the launching assembly to urge the launching assembly to move toward the receiving assembly, thereby adjusting the distance between the launching assembly and the receiving assembly.

10. The apparatus of claim 9, wherein the adjustment mechanism is in contact with the transmitting lens to urge the transmitting lens toward the receiving assembly to adjust the position of the optical axis of the transmitting lens relative to the receiving assembly.

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