CN212255690U - Continuous wave coherent laser radar zooming equipment - Google Patents
Continuous wave coherent laser radar zooming equipment Download PDFInfo
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- CN212255690U CN212255690U CN202020762960.2U CN202020762960U CN212255690U CN 212255690 U CN212255690 U CN 212255690U CN 202020762960 U CN202020762960 U CN 202020762960U CN 212255690 U CN212255690 U CN 212255690U
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Abstract
The application discloses continuous wave coherent laser radar zooming equipment which comprises a laser output assembly, a circulator, a liquid lens, an optical fiber coupler, an optical processing assembly and a control assembly; the circulator is used for transmitting the laser output by the laser output assembly to the liquid lens; the optical fiber coupler is used for beating the echo light beam of the laser at the focus of the liquid lens and the local oscillation light beam of the laser output assembly to obtain a beaten light beam; the optical processing component is used for obtaining a digital signal according to the beat frequency post-beam; the control component is used for adjusting the radius of the curved surface of the liquid lens according to the digital signal. The focal position is adjusted by adjusting the radius of the curved surface of the liquid lens, so that the precision control and the use reliability are obviously enhanced.
Description
Technical Field
The application relates to the technical field of laser radars, in particular to continuous wave coherent laser radar zooming equipment.
Background
The continuous wave coherent laser radar can be used for realizing wind field detection of different distance points in the field of atmospheric detection. The emitted light is focused at different distance points to obtain echo information at corresponding focus points, and the information detection at different distances on the emission path is realized by changing the positions of the focus points.
The current continuous wave coherent laser radar adjusts the position of the optical fiber of the collimation system or the front and back of the collimation lens in a mechanical mode when adjusting the focus point of a light spot, and changes the distance between the emergent light spot and the collimation lens. In the wind field detection process, the measurement output of second-level data is required, so that the position of an optical fiber or a lens of a collimation system needs to be changed rapidly, mechanical adjustment needs to be adjusted in place rapidly in a short time, and micron-level accurate positioning needs to be carried out after the mechanical adjustment is carried out in place, so that the reliability in the aspect of precision control is low. In addition, continuous measurement needs to be performed for several months in wind field detection application, and position switching needs to be performed on the optical fiber or the lens of the collimation system thousands of times under the condition of executing position change once per second, so that the mechanical adjustment type structure basically cannot meet the service life requirement in practical application.
Therefore, how to solve the above technical problems should be a great concern to those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a continuous wave coherent laser radar equipment of zooming to promote continuous wave coherent laser radar equipment of zooming precision and practicality.
In order to solve the technical problem, the application provides a continuous wave coherent laser radar zooming device, which comprises a laser output assembly, a circulator, a liquid lens, an optical fiber coupler, an optical processing assembly and a control assembly;
the circulator is used for transmitting the laser output by the laser output assembly to the liquid lens; the optical fiber coupler is used for beating the echo light beam of the laser at the focus of the liquid lens and the local oscillation light beam of the laser output assembly to obtain a beaten light beam; the optical processing component is used for obtaining a digital signal according to the beat frequency post-beam; the control component is used for adjusting the radius of the curved surface of the liquid lens according to the digital signal.
Optionally, the method further includes:
a convex lens.
Optionally, the laser output assembly includes a seed laser and a fiber amplifier.
Optionally, the control assembly includes an industrial personal computer and a liquid lens controller.
Optionally, the optical processing component includes a balanced detector and a data collector.
Optionally, the optical fiber amplifier is an erbium-doped optical fiber amplifier or an ytterbium-doped optical fiber amplifier.
The continuous wave coherent laser radar zooming equipment comprises a laser output assembly, a circulator, a liquid lens, an optical fiber coupler, an optical processing assembly and a control assembly; the circulator is used for transmitting the laser output by the laser output assembly to the liquid lens; the optical fiber coupler is used for beating the echo light beam of the laser at the focus of the liquid lens and the local oscillation light beam of the laser output assembly to obtain a beaten light beam; the optical processing component is used for obtaining a digital signal according to the beat frequency post-beam; the control component is used for adjusting the radius of the curved surface of the liquid lens according to the digital signal.
It can be seen that continuous wave coherent laser radar equipment that zooms in this application includes laser output subassembly, circulator, liquid lens, fiber coupler, optical processing subassembly, control assembly, and the curved surface radius through digital signal adjustment liquid lens realizes the adjustment to liquid lens focus, and then realizes the adjustment to laser facula focus distance, realizes the detection to different distance departments promptly, avoids adopting mechanical adjustment's mode to adjust the facula focus distance, and accuracy control and use reliability enhancement.
Drawings
For a clearer explanation of the embodiments or technical solutions of the prior art of the present application, the drawings needed for the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a continuous wave coherent lidar zooming apparatus provided in an embodiment of the present application;
fig. 2 is a schematic structural diagram of another continuous wave coherent lidar zooming apparatus provided in an embodiment of the present application;
fig. 3 is a schematic view of a portion of the optical path.
Detailed Description
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present application and 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.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be implemented in other ways different from the specific details set forth herein, and one skilled in the art may similarly generalize the present invention without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
As described in the background section, the current continuous wave coherent laser radar relies on a mechanical adjustment mode when adjusting the focus point of a light spot, the accuracy of precision control is poor, and the mechanical adjustment type structure basically cannot meet the service life requirement in practical application due to the need of performing a large number of position switching.
In view of this, the present application provides a continuous wave coherent lidar zooming device, please refer to fig. 1, where fig. 1 is a schematic structural diagram of a continuous wave coherent lidar zooming device provided in an embodiment of the present application, and the device includes:
the device comprises a laser output assembly 1, a circulator 2, a liquid lens 3, an optical fiber coupler 4, an optical processing assembly 5 and a control assembly 6;
wherein, the circulator 2 is used for transmitting the laser output by the laser output assembly 1 to the liquid lens 3; the optical fiber coupler 4 is used for beating the echo light beam of the laser at the focus of the liquid lens 3 and the local oscillation light beam of the laser output component 1 to obtain a beaten light beam; the optical processing component 5 is used for obtaining a digital signal according to the beat frequency post-beam; the control component 6 is used for adjusting the curved surface radius of the liquid lens 3 according to the digital signal.
Specifically, laser output by the laser output assembly 1 passes through the circulator 2, then irradiates through the liquid lens 3, enters atmosphere, generates an echo beam at a focal point of the liquid lens 3, passes through the circulator 2 after passing through the liquid lens 3, and then enters the optical fiber coupler 4 to beat with local oscillation light.
The laser output assembly 1 comprises a seed laser 11 and an optical fiber amplifier 12, wherein the seed laser 11 emits seed laser, and the optical fiber amplifier 12 amplifies the power of the seed laser to obtain high-power laser. Note that the local oscillator light is seed laser light emitted by the seed laser 11.
In the present embodiment, the optical fiber amplifier 12 is not particularly limited, and may be provided by itself. For example, the fiber amplifier 12 is an erbium-doped fiber amplifier 12 or an ytterbium-doped fiber amplifier 12.
The optical processing component 5 comprises a balance detector 51 and a data acquisition unit 52, wherein the balance detector 51 is used for generating an electric signal according to the beat frequency-processed light beam and sending the electric signal to the data acquisition unit 52; the data collector 52 is used to convert the electrical signal into a digital signal.
The control component 6 includes an Industrial Personal Computer (IPC) 61 and a liquid lens controller 62, the Industrial Personal Computer 61 is configured to perform inversion calculation according to the digital signal sent by the data collector 52, and send a voltage control instruction to the liquid lens controller 62; the liquid lens controller 62 is configured to send a control voltage to the liquid lens 3 to adjust the radius of the curved surface of the liquid lens 3, that is, to adjust the focal length of the liquid lens 3. Therefore, the focal length can be freely changed within a certain adjustment range by the voltage control command of the industrial personal computer 61, so that the laser output by the laser output assembly 1 is focused at different distances, and the detection information at different distances is acquired. The larger the radius of the curved surface is, the smaller the focal length is, and the smaller the radius of the curved surface is, the larger the focal length is.
Referring to fig. 2 and 3, on the basis of the above embodiments, in an embodiment of the present application, the continuous wave coherent lidar zoom apparatus further includes a convex lens 7.
When the continuous wave coherent laser radar zooming equipment needs a larger-size optical area in the using process, the liquid lens 3 and the lens 7 form a combined lens at the moment, because the diameter of the liquid lens 3 is limited and the requirement cannot be met by only depending on the liquid lens 3. When the focal length of the liquid lens 3 is changed, the focusing position of the combined lens is correspondingly changed, and when the focal length of the liquid lens 3 is increased, the integral focal length of the combined lens is increased, and the focusing distance of the laser is also increased; when the focal length of the liquid lens 3 becomes smaller, the overall focal length of the combined lens becomes smaller, and the focusing distance of the laser light also becomes smaller.
Continuous wave coherent laser radar equipment that zooms in this application includes laser output subassembly 1, circulator 2, liquid lens 3, fiber coupler 4, optical processing subassembly 5, control assembly 6, through the curved surface radius of digital signal adjustment liquid lens 3, the realization is to the adjustment of 3 focuses on liquid lens, and then the realization is to laser spot focus distance's adjustment, realize the detection to different distance departments promptly, avoid adopting mechanical regulation's mode to adjust the spot focus distance, accuracy control and use reliability enhancement.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The continuous wave coherent lidar zoom apparatus provided by the present application is described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (6)
1. A continuous wave coherent laser radar zooming device is characterized by comprising a laser output assembly, a circulator, a liquid lens, an optical fiber coupler, an optical processing assembly and a control assembly;
the circulator is used for transmitting the laser output by the laser output assembly to the liquid lens; the optical fiber coupler is used for beating the echo light beam of the laser at the focus of the liquid lens and the local oscillation light beam of the laser output assembly to obtain a beaten light beam; the optical processing component is used for obtaining a digital signal according to the beat frequency post-beam; the control component is used for adjusting the radius of the curved surface of the liquid lens according to the digital signal.
2. The continuous wave coherent lidar zoom apparatus of claim 1, further comprising:
a convex lens.
3. The continuous wave coherent lidar zoom apparatus of claim 2, wherein the laser output assembly comprises a seed laser and a fiber amplifier.
4. The continuous wave coherent lidar zoom apparatus of claim 3, wherein the control assembly comprises an industrial personal computer and a liquid lens controller.
5. The continuous wave coherent lidar zoom apparatus of claim 4, wherein the optical processing component comprises a balanced detector and a data collector.
6. The continuous wave coherent lidar zoom apparatus of claim 5 wherein the fiber amplifier is an erbium doped fiber amplifier or an ytterbium doped fiber amplifier.
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| CN202020762960.2U CN212255690U (en) | 2020-05-09 | 2020-05-09 | Continuous wave coherent laser radar zooming equipment |
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| CN202020762960.2U CN212255690U (en) | 2020-05-09 | 2020-05-09 | Continuous wave coherent laser radar zooming equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203996A (en) * | 2021-04-29 | 2021-08-03 | 纵目科技（上海）股份有限公司 | Method, device and system for testing influence of bumper on performance of millimeter wave radar |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203996A (en) * | 2021-04-29 | 2021-08-03 | 纵目科技（上海）股份有限公司 | Method, device and system for testing influence of bumper on performance of millimeter wave radar |
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