Double-view-field aerosol laser radar
By designing a dual-field-of-view aerosol lidar, and utilizing the different field-of-view angles of two receiving telescopes and signal stitching technology, the problems of blind zones and transition zones in traditional lidar are solved, achieving more stable and accurate data acquisition.
Patent Information
- Application Number
- CN202520031608.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-07
AI Technical Summary
Traditional lidar suffers from problems such as the inability to reduce blind zones and the inability to stably adjust transition zones, leading to unstable equipment operation.
It adopts a dual-field-of-view design, using two receiving telescopes, one with a wider field of view than the other. The signals are stitched together by a signal processing unit to reduce blind spots and improve data accuracy.
This effectively reduces the blind spot of the lidar, improves the integrity and accuracy of data acquisition, and ensures stable operation of the equipment over a long period of time.
Smart Images
Figure CN223796693U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of lidar, and specifically relates to a dual-field-of-view aerosol lidar. Background Technology
[0002] LiDAR is an active remote sensing device that uses a laser as its light source to emit a laser beam into the atmosphere. A telescope receives the backscattered echo signals from atmospheric molecules or aerosols, and then uses photoelectric detection technology to measure and analyze the spatial distribution of atmospheric molecules or aerosols over long distances. However, within a very short distance from the lidar, the laser beam emitted by the laser is outside the telescope's receiving field of view, and the telescope cannot receive the backscattered light from atmospheric molecules or aerosols. This area is called the lidar's blind zone. Further away from the blind zone, the emitted laser beam gradually enters the receiving telescope's receiving field of view, and only a portion of the backscattered light from atmospheric molecules or aerosols is received. This area is called the lidar's transition zone. Theoretically, the larger the telescope's receiving field of view, the smaller the lidar's blind zone and transition zone. However, to ensure the lidar signal's signal-to-noise ratio, a suitable telescope field of view is set, which inevitably creates a blind zone and a transition zone. These are fixed values that cannot be changed by other hardware or software means; this is the technical barrier of single-field-of-view lidar.
[0003] Traditional aerosol lidar only has one telescope and one field of view. The blind zone cannot be reduced, and the transition zone can only be corrected through algorithms. If the optical path deviates, the transition zone needs to be readjusted, making it impossible to guarantee long-term stable operation. Therefore, a new type of lidar is urgently needed to solve this problem. Utility Model Content
[0004] To address the aforementioned issues, this utility model discloses a dual-field-of-view aerosol lidar, which includes a laser transmitter, a first receiving telescope, a second receiving telescope, and a signal processing unit.
[0005] The first receiving telescope and the second receiving telescope are arranged in parallel, and the receiving field of view of the second receiving telescope is greater than that of the first receiving telescope.
[0006] The laser emitter is used to emit laser light into the atmosphere;
[0007] The first and second receiving telescopes simultaneously receive atmospheric echo signals after the laser interacts with aerosols in the atmosphere.
[0008] The signal processing unit is used to stitch together the atmospheric echo signals received by the first and second receiving telescopes, and to obtain atmospheric data by inverting the stitched atmospheric echo signals.
[0009] Furthermore, the first receiving telescope and the second receiving telescope are fixedly connected by a fixed connection device.
[0010] Both the first and second receiving telescopes are oriented in the same direction as the laser emitter.
[0011] Furthermore, an adjustable aperture is provided in front of the second receiving telescope, which is used to adjust the receiving field of view of the second receiving telescope.
[0012] Furthermore, the processing unit includes a receiving module and a computing module;
[0013] The receiving module is used to acquire atmospheric echo signals from the first receiving telescope and the second receiving telescope, as well as the adjustment status of the adjustable aperture.
[0014] The calculation module is used to perform splicing processing on the echo signals of the first receiving telescope and the second receiving telescope according to the adjustment state.
[0015] Furthermore, the adjustment state includes a first state, in which the field of view of the first receiving telescope is greater than the field of view of the second receiving telescope by a preset value when the adjustable aperture is in the first state.
[0016] The calculation module extracts data from the atmospheric echo signal of the first receiving telescope at a distance greater than a preset distance from the laser transmitter.
[0017] At a distance less than a preset distance from the laser transmitter, data from the atmospheric echo signal of the second receiving telescope is captured.
[0018] Furthermore, the adjustment state includes a second state, in which the field of view of the first receiving telescope is smaller than the field of view of the second receiving telescope by a preset value when the adjustable aperture is in the second state.
[0019] The calculation module is used to acquire atmospheric echo signals from the first receiving telescope and the second telescope respectively, and to perform inversion after averaging the echo signals.
[0020] The advantage of this invention is that it can effectively reduce the blind spot of the lidar.
[0021] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0023] Figure 1 A schematic diagram of a dual-field-of-view aerosol lidar structure according to an embodiment of the present invention is shown.
[0024] In the diagram: 1. First receiving telescope; 2. Laser transmitter; 3. Second receiving telescope. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0026] This utility model discloses a dual-field-of-view aerosol lidar, which includes a laser transmitter 2, a first receiving telescope 1, a second receiving telescope 3, and a signal processing unit.
[0027] The first receiving telescope 1 and the second receiving telescope 3 are arranged in parallel, and the receiving field of view of the second receiving telescope 3 is greater than that of the first receiving telescope 1.
[0028] The laser emitter 2 is used to emit lasers into the atmosphere;
[0029] The first receiving telescope 1 and the second receiving telescope 3 synchronously receive atmospheric echo signals after the laser interacts with aerosols in the atmosphere.
[0030] The signal processing unit is used to stitch together the atmospheric echo signals received by the first receiving telescope 1 and the second receiving telescope 3, and to obtain atmospheric data by inverting the stitched atmospheric echo signals.
[0031] Specifically, based on the theory that a larger receiving field of view of a receiving telescope results in a smaller blind zone, and a smaller receiving field of view results in a larger blind zone, this embodiment employs two receiving telescopes with significantly different receiving fields of view. After the laser emitter 2 emits a laser towards the target area, the first receiving telescope 1 and the second receiving telescope 3 simultaneously receive the atmospheric echo signal resulting from the interaction of the laser with atmospheric aerosols. Since the first receiving telescope 1 and the second receiving telescope 3 are arranged in parallel, it is assumed that the atmospheric echo signals received by both are identical. The receiving field of view of the second receiving telescope 3 is much larger than that of the first receiving telescope 1. The first receiving telescope 1 has a smaller field of view, so it can receive signals from farther away, but at the same time, its blind zone at close range is larger. Conversely, the second receiving telescope 3 has a larger field of view, and although it cannot receive signals from very far away, its blind zone at close range is very small. At this time, the processing unit stitches the data from the first receiving telescope 1 and the second receiving telescope 3 together, so that the entire lidar can receive echo signals from afar, using the data from the first receiving telescope 1 at a distance and the data from the second echo signal at close range. Overall, lidar can achieve long-distance data acquisition and has a small blind spot.
[0032] Furthermore, the first receiving telescope 1 and the second receiving telescope 3 are fixedly connected by a fixed connection device.
[0033] The first receiving telescope 1 and the second receiving telescope 3 are both oriented in the same direction as the laser transmitter 2.
[0034] Specifically, the first receiving telescope 1 and the second receiving telescope 3 are fixedly connected by a fixed connection device. When the lidar moves, the first receiving telescope 1 and the second receiving telescope 3 move synchronously, and the angle and distance of movement are the same. Therefore, the atmospheric echo signals received by the first receiving telescope 1 and the second receiving telescope 3 are almost identical. When both the first receiving telescope 1 and the second receiving telescope 3 are oriented in the same direction as the laser emitter 2, both the first receiving telescope 1 and the second receiving telescope 3 can receive the atmospheric echo signals after the interaction between the laser emitter 2 and the aerosol particles.
[0035] Furthermore, an adjustable aperture is provided in front of the second receiving telescope 3, which is used to adjust the receiving field of view of the second receiving telescope 3.
[0036] Specifically, an adjustable aperture is provided in front of the second receiving telescope 3, which adjusts the receiving field of view of the second receiving telescope 3. Different types of atmospheric echo signals can be received by the second receiving telescope 3 through different receiving fields of view, allowing the processing unit to make different choices when stitching data. For example, by adjusting the adjustable aperture, data can be collected multiple times, and the atmospheric echo signals from the first receiving telescope 1 and the second receiving telescope 3 can be stitched together. Then, multiple sets of stitched data are analyzed to obtain more accurate atmospheric data.
[0037] Furthermore, the processing unit includes a receiving module and a computing module;
[0038] The receiving module is used to acquire atmospheric echo signals from the first receiving telescope 1 and the second receiving telescope 3, as well as the adjustment status of the adjustable aperture.
[0039] The calculation module is used to splice the echo signals of the first receiving telescope 1 and the second receiving telescope 3 according to the adjustment state.
[0040] Specifically, the receiving module acquires the atmospheric echo signals from the first receiving telescope 1 and the second receiving telescope 3, as well as the adjustment state of the adjustable aperture, and transmits them to the calculation module. The calculation module then determines the signal splicing scheme for the first receiving telescope 1 and the second receiving telescope 3 based on the acquired data.
[0041] Furthermore, the adjustment state includes a first state, in which the field of view of the first receiving telescope 1 is greater than the field of view of the second receiving telescope 3 by a preset value when the adjustable aperture is in the first state.
[0042] The calculation module extracts data from the atmospheric echo signal of the first receiving telescope 1 at a distance greater than a preset distance from the laser transmitter 2.
[0043] At a distance less than a preset distance from the laser transmitter 2, data from the atmospheric echo signal of the second receiving telescope 3 is captured.
[0044] Specifically, the field of view of the first receiving telescope 1 is much larger than that of the second receiving telescope 3. In this case, the first receiving telescope 1 can effectively acquire atmospheric echo signals from a distance relative to the lidar, but it has a blind spot at close range. The second receiving telescope 3, on the other hand, has a smaller field of view, resulting in a smaller blind spot. The calculation module extracts data from the first receiving telescope 1 at a greater distance and data from the second receiving telescope 3 at a closer distance, and then stitches the two together to obtain the complete atmospheric echo signal.
[0045] Furthermore, the adjustment state includes a second state, in which the field of view of the first receiving telescope 1 is smaller than the field of view of the second receiving telescope 3 by a preset value when the adjustable aperture is in the second state.
[0046] The calculation module is used to acquire atmospheric echo signals from the first receiving telescope 1 and the second telescope respectively, and to perform inversion after averaging the echo signals.
[0047] Specifically, the fields of view of the first receiving telescope 1 and the second receiving telescope 3 are similar. The calculation module collects data from both, obtaining two sets of data. Then, the two sets of data are averaged and inverted to obtain aerosol data. The data from the two receiving telescopes makes the acquired data more accurate, and the inverted data more precise.
[0048] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1.A dual field of view aerosol lidar, characterized in that, the lidar comprises a laser emitter (2), a first receiving telescope (1), a second receiving telescope (3) and a signal processing unit; the first receiving telescope (1) and the second receiving telescope (3) are arranged in parallel, and the receiving field of view angle of the second receiving telescope (3) is greater than that of the first receiving telescope (1); the laser emitter (2) is used for emitting laser to the atmosphere; the first receiving telescope (1) and the second receiving telescope (3) synchronously receive the atmospheric echo signal after the laser interacts with the aerosol in the atmosphere; the signal processing unit is used for stitching the atmospheric echo signals received by the first receiving telescope (1) and the second receiving telescope (3), and obtaining atmospheric data through inversion of the stitched atmospheric echo signal. 2.The dual field of view aerosol lidar according to claim 1, characterized in that, the first receiving telescope (1) and the second receiving telescope (3) are fixedly connected through a fixed connection device; the first receiving telescope (1) and the second receiving telescope (3) are arranged in the same direction as the laser emitter (2). 3.The dual field of view aerosol lidar according to claim 1, characterized in that, an adjustable diaphragm is arranged in front of the second receiving telescope (3), and the adjustable diaphragm is used for adjusting the receiving field of view of the second receiving telescope (3). 4.The dual field of view aerosol lidar according to claim 3, characterized in that, the processing unit comprises a receiving module and a calculation module; the receiving module is used for obtaining the atmospheric echo signals of the first receiving telescope (1) and the second receiving telescope (3) and the adjustment state of the adjustable diaphragm; the calculation module is used for stitching the echo signals of the first receiving telescope (1) and the second receiving telescope (3) according to the adjustment state. 5.The dual field of view aerosol lidar according to claim 4, characterized in that, the adjustment state comprises a first state, when the adjustable diaphragm is in the first state, the field of view of the first receiving telescope (1) is greater than that of the second receiving telescope (3) by a preset value; the calculation module is used for intercepting the data in the atmospheric echo signal of the first receiving telescope (1) at a distance greater than a preset distance from the laser emitter (2); the calculation module is used for intercepting the data in the atmospheric echo signal of the second receiving telescope (3) at a distance less than a preset distance from the laser emitter (2). 6.The dual field of view aerosol lidar according to claim 4, characterized in that, the adjustment state comprises a second state, when the adjustable diaphragm is in the second state, the field of view of the first receiving telescope (1) is less than that of the second receiving telescope (3) by a preset value; the calculation module is used for respectively obtaining the atmospheric echo signals of the first receiving telescope (1) and the second receiving telescope, and performing inversion after mean value processing of the echo signals.