CN211123254U - Off-axis laser radar - Google Patents
Off-axis laser radar Download PDFInfo
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- CN211123254U CN211123254U CN201921860470.XU CN201921860470U CN211123254U CN 211123254 U CN211123254 U CN 211123254U CN 201921860470 U CN201921860470 U CN 201921860470U CN 211123254 U CN211123254 U CN 211123254U
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Abstract
The utility model provides an off-axis laser radar, which comprises a laser emitting unit and a light receiving unit; the light receiving unit includes: the first light receiving unit comprises a first telescope component, and an optical main shaft of the first telescope component is not collinear with an optical main shaft of the laser emitting unit; the second light receiving unit comprises a second telescope component, and an optical main shaft of the second telescope component is not collinear with an optical main shaft of the laser emission unit; the aperture of the second telescope component is larger than that of the first telescope component; the off-axis lidar further comprising: and the light deflection unit is respectively arranged at the light outlet of the laser emission unit and the light inlet of the light receiving unit. The utility model has the advantages of small blind area, simple structure, convenient adjustment, etc.
Description
Technical Field
The utility model relates to an atmosphere is measured, in particular to off-axis formula laser radar.
Background
With the wide application of the laser radar remote sensing technology in high and new technical fields such as atmospheric environment monitoring, aerospace, communication, navigation and positioning, more and more attention is paid at present. The whole laser radar system can be divided into three parts, namely laser emission, echo signal receiving, collecting and controlling, wherein laser emitted by a laser generates a backscattering signal under the action of aerosol in the atmosphere and various atmospheric components, and the backscattering signal is received by a detector and subjected to data collection processing and then is inverted to obtain atmospheric related parameters so as to realize different detection requirements.
In a lidar system, the optical coaxiality of the transmit and receive optical paths is a difficult problem that must be addressed. In practical applications, the change of environmental factors and mechanical vibration can cause the deviation of the optical axis, thereby leading to the invalidation of a large number of measurement signals and causing errors in the measurement of the signals. Therefore, before each measurement using the laser radar, the coaxial adjustment of the transmitting and receiving optical path is required, and the main mode of the coaxial adjustment is to manually perform fine adjustment on the reflecting mirror or the reflecting prism so as to realize the deflection of the optical path. However, the method has higher requirements on the adjustment and fixing structure of the reflector, needs to perform fine adjustment operation by means of a precise optical adjustment bracket and a level instrument, is time-consuming and tedious, has higher difficulty and has poorer environmental adaptability.
In the Z L200810019534.3 laser radar transmitting and receiving light path parallel adjusting system and method, a butt joint mirror, a total reflection mirror and a pair of right-angle prisms are arranged in the light path in front of a laser, a laser beam emitted from a corner reflector enters a receiving telescope lens barrel and is focused in a focal plane of the receiving telescope, a focused laser spot is turned by a 90-degree turning mirror and then is imaged on a CCD, whether the light path is parallel or not is judged by observing the shape of a laser spot image and is adjusted, and the adjustment mode has higher requirements on the mounting and processing precision of structural members.
In a coaxial transmitting and receiving system of CN201110088354.2 laser radar and a coaxial adjusting method of the system, the pitching and the orientation of a first reflector are controlled by the rotation of a motor, the image centroid position collected by a CCD camera is obtained in real time when a laser operates, and the coaxial adjustment is realized by calculating and controlling the deviation of the image centroid position collected when the background light is received.
Laser radar in the existing market is mostly a coaxial system, the light path adjusting mode is complicated, the requirement on the processing precision of structural members is high, the structural members are easily influenced by environmental factors such as temperature and vibration, the stability is not good, and the application is difficult to popularize on a large scale.
SUMMERY OF THE UTILITY MODEL
For solving the not enough among the above-mentioned prior art scheme, the utility model provides a blind area is little, simple structure, adjust convenient off-axis formula laser radar.
The utility model aims at realizing through the following technical scheme:
the off-axis laser radar comprises a laser transmitting unit and a light receiving unit; the light receiving unit includes:
a first light receiving unit including a first telescope component whose optical principal axis is not collinear with an optical principal axis of the laser emitting unit;
a second light receiving unit including a second telescope assembly whose optical principal axis is not collinear with the optical principal axis of the laser emitting unit; the aperture of the second telescope component is larger than that of the first telescope component;
the off-axis lidar further comprising:
and the light deflection unit is respectively arranged at the light outlet of the laser emission unit and the light inlet of the light receiving unit.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
1. the blind area is small;
the laser radar light path structure is of an off-axis type, but in view of the large off-axis type dead zone, another light receiving unit (with weaker light receiving capability) is added on the basis of the original light receiving unit (with stronger light receiving capability), and low dead zone detection is realized by signal splicing of the light receiving units with different light receiving capabilities;
2. the structure is simple, the adjustment is convenient,
the light path deflection is realized only by devices such as the wedge prism, the parallelism of the emergent light path and the receiving light path is ensured, the structural form is simple, the adjusting mode is simple, other optical adjusting instruments are not needed, the influence of environmental factors such as temperature and vibration is small, the stability is good, and the long-time stable working operation of the radar can be ensured.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a schematic diagram of an off-axis lidar according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 schematically shows a schematic structural diagram of an off-axis lidar according to an embodiment of the present invention, as shown in fig. 1, the off-axis lidar includes:
the optical transmitter comprises a light emitting unit 1, wherein the light emitting unit 1 comprises a laser, a beam expanding unit and the like, and the specific structure and the working mode are the prior art in the field and are not described herein again;
a first light receiving unit 4, wherein the first light receiving unit 4 comprises a first telescope component, an optical main axis of the first telescope component is not collinear with an optical main axis of the laser emitting unit, such as the light emitting unit 1 and the first light receiving unit 4 are arranged in a left-right mode;
a second light receiving unit 2, wherein the second light receiving unit 2 comprises a second telescope component, an optical main axis of the second telescope component is not collinear with an optical main axis of the laser emitting unit, for example, the light emitting unit 1 and the second light receiving unit 2 are in an up-and-down structure; the aperture of the second telescope component is larger than that of the first telescope component, namely the light receiving capability of the second light receiving unit 2 is stronger than that of the first light receiving unit 4;
and a light deflecting unit 5, such as a wedge prism, which is respectively disposed at the light emitting position of the laser emitting unit and the light incident position of the light receiving unit (such as the first light receiving unit and/or the second light receiving unit), and which makes the directions of the light emitting from the light emitting unit and the light incident from the light receiving unit parallel by adjusting the directions of the light emitting or incident.
In order to improve the light receiving capability, further, the first light receiving unit or the second light receiving unit includes:
the reflecting surfaces of the concave reflecting mirror and the convex reflecting mirror are oppositely arranged;
the aperture of the convex reflector is smaller than that of the concave reflector; the outside light is reflected by the concave reflector and the convex reflector in sequence and then penetrates through the concave reflector to be emitted, and therefore, a hole can be formed in the center of the concave reflector, or no film is formed in the center of the groove reflector which is made of lens materials and has a coated reflecting surface.
Further, the laser emitting unit, the first light receiving unit, and the light deflecting unit are disposed on the carrier for easy mounting and adjustment.
In order to facilitate adjustment of the light deflection unit, the off-axis lidar further comprises:
a rotating member on which the light deflecting unit is disposed.
Example 2:
according to the utility model discloses off-axis formula lidar's application example of embodiment 1.
In the application example, the light emitting unit and the first light receiving unit are arranged on the bearing plate and are of a left-right structure; the second light receiving unit is arranged below the bearing plate; the light deflection unit comprises a first wedge-shaped prism and a second wedge-shaped prism which are arranged on the bearing plate, wherein the first wedge-shaped prism is arranged at the light outlet of the laser emission unit; the second wedge prism is arranged at the light incident position of the first light receiving unit; the first wedge-shaped prism and the second wedge-shaped prism are both arranged on the rotating piece, and the rotating piece is rotatably arranged on the bearing plate; the first light receiving unit and the second light receiving unit respectively comprise a concave reflector and a convex reflector, the reflecting surfaces of the concave reflector and the convex reflector are oppositely arranged, and the aperture of the convex reflector is smaller than that of the concave reflector; the external light is reflected by the concave reflector and the convex reflector in sequence and then penetrates through the concave reflector to be emitted, and based on the external light, a hole is formed in the center of the concave reflector; in contrast, the aperture of the concave mirror of the second light receiving unit is larger than that of the concave mirror of the first light receiving unit.
The working mode of the off-axis laser radar is as follows:
the light emitting unit emits detection light and emits the detection light to the atmosphere;
scattered light of the detection light in the atmosphere is received by the first light receiving unit and the second light receiving unit, respectively; adjusting the wedge prism to enable the directions of the detection light and the scattered light to be parallel and non-collinear;
the output signals of the first light receiving unit and the second light receiving unit are processed so that information of the atmosphere is known.
Claims (6)
1. The off-axis laser radar comprises a laser transmitting unit and a light receiving unit; the method is characterized in that: the light receiving unit includes:
a first light receiving unit including a first telescope component whose optical principal axis is not collinear with an optical principal axis of the laser emitting unit;
a second light receiving unit including a second telescope assembly whose optical principal axis is not collinear with the optical principal axis of the laser emitting unit; the aperture of the second telescope component is larger than that of the first telescope component;
the off-axis lidar further comprising:
and the light deflection unit is respectively arranged at the light outlet of the laser emission unit and the light inlet of the light receiving unit.
2. An off-axis lidar according to claim 1, wherein: the first light receiving unit or the second light receiving unit includes:
the reflecting surfaces of the concave reflecting mirror and the convex reflecting mirror are oppositely arranged;
the aperture of the convex reflector is smaller than that of the concave reflector; the external light is reflected by the concave reflector and the convex reflector in sequence and then penetrates through the concave reflector to be emitted.
3. An off-axis lidar according to claim 1, wherein: the light deflecting unit includes:
the first wedge-shaped prism is arranged at the light outlet of the laser emission unit;
a second wedge prism disposed at a light entrance of the first light receiving unit.
4. An off-axis lidar according to claim 1, wherein: the laser emitting unit and the first light receiving unit are of a left-right structure, and the laser emitting unit and the second light receiving unit are of an up-down structure.
5. An off-axis lidar according to claim 4, wherein: the laser emitting unit, the first light receiving unit, and the light deflecting unit are disposed on the carrier.
6. An off-axis lidar according to claim 1, wherein: the off-axis lidar further comprising:
a rotating member on which the light deflecting unit is disposed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921860470.XU CN211123254U (en) | 2019-10-31 | 2019-10-31 | Off-axis laser radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921860470.XU CN211123254U (en) | 2019-10-31 | 2019-10-31 | Off-axis laser radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211123254U true CN211123254U (en) | 2020-07-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921860470.XU Active CN211123254U (en) | 2019-10-31 | 2019-10-31 | Off-axis laser radar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211123254U (en) |
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2019
- 2019-10-31 CN CN201921860470.XU patent/CN211123254U/en active Active
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