CN118191794B - Device and method for preventing direct sunlight of atmosphere detection laser radar - Google Patents
Device and method for preventing direct sunlight of atmosphere detection laser radar Download PDFInfo
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- CN118191794B CN118191794B CN202410622382.5A CN202410622382A CN118191794B CN 118191794 B CN118191794 B CN 118191794B CN 202410622382 A CN202410622382 A CN 202410622382A CN 118191794 B CN118191794 B CN 118191794B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4818—Constructional features, e.g. arrangements of optical elements using optical fibres
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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- Radar, Positioning & Navigation (AREA)
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- Electromagnetism (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
An atmospheric detection laser radar sunlight prevention direct irradiation device and method, comprising: the dimming baffle is rotationally arranged in front of the receiving mirror of the laser radar and can partially shield the receiving mirror in the rotation process of the dimming baffle, and a first light hole array for controlling the light intensity of the receiving mirror is arranged on the dimming baffle; the parallel flat plate is arranged in the receiving mirror and used for changing the focusing point position of direct sunlight after being focused by the lens of the receiving mirror, and a second light hole coaxial with the echo receiving optical fiber in the receiving mirror is formed in the parallel flat plate and used for allowing echo signal light to pass through; the sunlight sensing assembly comprises a plurality of sensing optical fibers arranged in parallel on the periphery of the echo receiving optical fibers and photoelectric detection modules arranged at the tail ends of all the sensing optical fibers; the main control module is used for controlling the rotation of the dimming baffle according to the detection data of the photoelectric detection module. The invention can realize the full protection of the laser radar in the direct sunlight environment.
Description
Technical Field
The invention relates to the technical field of laser radars, in particular to an atmospheric detection laser radar sunlight shielding direct irradiation device and method.
Background
The atmospheric detection laser radar is a laser radar special for atmospheric environment detection, such as: the laser cloud height instrument for detecting cloud layer, the visibility laser radar for detecting atmospheric visibility, the Raman laser radar for detecting atmospheric temperature, humidity or substance content and the like are widely applied to the fields of meteorological environment monitoring, atmospheric electromagnetic environment monitoring, atmospheric pollutant monitoring and the like at present.
The atmosphere detection laser radar works in an outdoor environment, the working process is easy to be interfered by direct sunlight in the daytime, the direct sunlight has great harm to the laser radar, the focused solar energy density is high and is far higher than the energy density safety threshold allowed by the optical element and the photoelectric detection element, and if the device is not protected, the device is damaged. Small-caliber laser radar equipment such as laser cloud height instruments, visibility laser radars and the like can be protected by using a solar filter. For the Raman laser radar, the aperture of a receiving mirror is large, the sensitivity of a detector is high, and effective protection cannot be carried out only by using a solar filter. One simple protection scheme is to completely shield the receiving mirror when direct sunlight occurs, and after a period of time, the receiving mirror is opened after the direct sunlight process is estimated, but for the laser radars deployed on mobile platforms such as vehicles and ships and the laser radars for scanning detection, the direct sunlight time estimation is difficult, even the direct sunlight time cannot be estimated, so that the direct sunlight process may not be ended when the receiving mirror is opened, and the laser radars are damaged.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the device and the method for preventing direct sunlight of the atmosphere detection laser radar, which can fully protect the laser radar and can continuously perform the atmosphere detection process.
In order to achieve the above purpose, the invention adopts the following specific scheme: an atmospheric detection lidar direct sunlight prevention device, comprising: the dimming baffle is rotationally arranged in front of the receiving mirror of the laser radar and can partially shield the receiving mirror in the rotation process of the dimming baffle, and a first light hole array for controlling the light intensity of the receiving mirror is arranged on the dimming baffle; the parallel flat plate is arranged in the receiving mirror and used for changing the focusing point position of direct sunlight after being focused by the lens of the receiving mirror, and a second light hole coaxial with the echo receiving optical fiber in the receiving mirror is formed in the parallel flat plate and used for allowing echo signal light to pass through; the sunlight sensing assembly comprises a plurality of sensing optical fibers arranged in parallel on the periphery of the echo receiving optical fibers and photoelectric detection modules arranged at the tail ends of all the sensing optical fibers; the main control module is used for controlling the rotation of the dimming baffle according to the detection data of the photoelectric detection module.
As a further optimization of the above-mentioned atmospheric detection lidar direct sunlight prevention device: the light adjusting baffle is connected with a driving assembly for driving the light adjusting baffle to rotate, the driving assembly comprises a stepping motor and a motor driver which are electrically connected, wherein an output shaft of the stepping motor is fixedly connected with the light adjusting baffle, the output shaft of the stepping motor is staggered with the central line of the light adjusting baffle and the first unthreaded hole array, and the motor driver is electrically connected with the main control module.
As a further optimization of the above-mentioned atmospheric detection lidar direct sunlight prevention device: the side of the dimming baffle is provided with a position detection module for detecting the position of the dimming baffle, the position detection module is electrically connected with the main control module, the position detection module comprises a transmitting unit for generating a position detection signal and a receiving unit for receiving the position detection signal, and the transmission state of the position detection signal can be changed in the rotation process of the dimming baffle.
As a further optimization of the above-mentioned atmospheric detection lidar direct sunlight prevention device: the light adjusting baffle is round or square, and the central line of the first light hole array coincides with the central line of the light adjusting baffle or is parallel to each other.
As a further optimization of the above-mentioned atmospheric detection lidar direct sunlight prevention device: the first light hole array comprises a plurality of first light holes, all the first light holes are uniformly distributed along the circumferential direction of the central line of the dimming baffle, a distance is reserved between the central line of the first light holes and the central line of the dimming baffle, and a shielding area capable of shielding the echo receiving optical fibers is enclosed by all the first light holes.
As a further optimization of the above-mentioned atmospheric detection lidar direct sunlight prevention device: the sensing optical fibers are divided into two groups, the sensing optical fibers in the same group are uniformly distributed along the circumferential direction of the echo receiving optical fibers, and the distances between the two groups of sensing optical fibers and the echo receiving optical fibers are different.
As a further optimization of the above-mentioned atmospheric detection lidar direct sunlight prevention device: the central line of the group of sensing optical fibers which is close to the echo receiving optical fibers encloses a circular first area, the aperture of the second optical hole is smaller than the diameter of the first area, and the aperture of the second optical hole is larger than the diameter of the echo receiving optical fibers.
As a further optimization of the above-mentioned atmospheric detection lidar direct sunlight prevention device: in a group of sensing optical fibers close to the echo receiving optical fibers, two adjacent sensing optical fibers are mutually attached; in a group of sensing optical fibers far away from the echo receiving optical fibers, an outside gap is reserved between two adjacent sensing optical fibers.
As a further optimization of the above-mentioned atmospheric detection lidar direct sunlight prevention device: the diameter of the sensing optical fiber is larger than that of the echo receiving optical fiber, and an inner gap is reserved between a group of sensing optical fibers which are close to the echo receiving optical fiber and the echo receiving optical fiber.
The invention further provides a method for preventing direct sunlight of the atmosphere detection laser radar, which is based on the device for preventing direct sunlight of the atmosphere detection laser radar, and comprises the following steps: the main control module acquires detection data of the photoelectric detection module in real time; when the detection data represent that the laser radar is directly irradiated by sunlight, the main control module determines the position of the dimming baffle; when the light-adjusting baffle is staggered with the receiving mirror, the main control module controls the light-adjusting baffle to rotate until the receiving mirror is partially shielded, and when the light-adjusting baffle partially shields the receiving mirror, the main control module controls the light-adjusting baffle to keep the current state.
The beneficial effects are that: the invention can protect the echo receiving optical fiber and the photoelectric detection module when the laser radar is subjected to direct sunlight, avoids damage to the echo receiving optical fiber and the photoelectric detection module caused by overhigh illumination intensity, does not need to estimate the direct sunlight time, and is suitable for the laser radar deployed on mobile platforms such as vehicles, ships and the like and the laser radar for scanning detection.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention;
fig. 2 is a schematic diagram of a distribution pattern of the first light aperture array.
The device comprises a 1-dimming baffle, a 2-stepping motor, a 3-power supply module, a 4-main control module, a 5-receiving mirror, a 6-position detection module, a 7-parallel flat plate, an 8-optical fiber bundle, a 9-photoelectric detection module, a 10-echo receiving optical fiber and an 11-sensing optical fiber.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an atmospheric detection lidar sunlight prevention device comprises a dimming baffle 1, a parallel plate 7, a sunlight sensing component and a main control module 4.
The dimming baffle 1 is rotationally arranged in front of the receiving mirror 5 of the laser radar, the receiving mirror 5 can be partially shielded in the rotation process of the dimming baffle 1, and a first unthreaded hole array for controlling the light intensity of the receiving mirror 5 is arranged on the dimming baffle 1.
The parallel flat plate 7 is arranged inside the receiving mirror 5 and used for changing the focusing point position of direct sunlight after being focused by the lens of the receiving mirror 5, and a second light hole coaxial with the echo receiving optical fiber 10 in the receiving mirror 5 is formed in the parallel flat plate 7 and used for allowing echo signal light to pass through.
The sunlight sensing assembly comprises a plurality of sensing optical fibers 11 which are arranged in parallel on the periphery side of the echo receiving optical fiber 10 and a photoelectric detection module 9 which is arranged at the tail ends of all the sensing optical fibers 11.
The main control module 4 is used for controlling the rotation of the dimming baffle 1 according to the detection data of the photoelectric detection module 9.
In the process of atmospheric detection by using the laser radar, the sunlight sensing component is used for sensing whether the sunlight is directly emitted in real time, specifically, when the sunlight is not directly emitted, the oblique sunlight can enter the receiving mirror 5 and is detected by the photoelectric detection module 9 through the sensing optical fiber 11. When direct sunlight is about to happen, the detection data of the photoelectric detection module 9 can be gradually lifted, when the detection data reaches a preset intensity threshold value, the main control module 4 determines the position of the dimming baffle 1, if the dimming baffle 1 is staggered with the receiving mirror 5 currently, namely, the dimming baffle 1 is not locally shielded by the receiving mirror 5 currently, the main control module 4 controls the dimming baffle 1 to rotate until the dimming baffle 1 locally shields the receiving mirror 5, and directly shields the echo receiving optical fiber 10 of the receiving mirror 5, so that the protection of the echo receiving optical fiber 10 and a high-sensitivity detector arranged behind the echo receiving optical fiber is realized, and meanwhile, the detection process of the laser radar on the atmosphere is stopped. On the other hand, at this time, sunlight still can enter the receiving mirror 5 through the first light hole array, but is limited by the first light hole array, and the intensity of the sunlight entering the receiving mirror 5 is greatly reduced, so that the effect of avoiding damage to the sensing optical fiber 11 and the photoelectric detection module 9 which are not shielded is achieved. If the dimming baffle 1 has already partially blocked the receiving mirror 5, i.e. the echo receiving optical fiber 10 has been blocked, the main control module 4 does not control the dimming baffle 1 to rotate, i.e. keeps the dimming baffle 1 in the current position. On the other hand, because the dimming baffle 1 is a local shielding receiving mirror 5, the first light hole array is arranged to enable direct sunlight to enter the receiving mirror 5, and the strength of the direct sunlight is greatly reduced, but the sensing optical fiber 11 and the photoelectric detection module 9 are still possibly damaged, so the parallel flat plate 7 is further arranged, and the parallel flat plate 7 can protect the sensing optical fiber 11 and the photoelectric detection module 9 by changing the sunlight focusing point position. It should be noted that, since the second light hole is formed in the parallel plate 7, when the dimming baffle 1 does not partially shield the receiving mirror 5, the echo signal light can smoothly irradiate the echo receiving optical fiber 10 through the second light hole, so that the parallel plate 7 does not affect the echo receiving optical fiber 10 and the process of detecting the atmosphere by the laser radar on the premise of protecting the sensing optical fiber 11 and the photoelectric detection module 9.
Over time, the direct sunlight can be gradually ended, the sunlight irradiating to the receiving mirror 5 is gradually changed into oblique sunlight from direct sunlight, in the process, because the sunlight can always enter the receiving mirror 5 through the first light hole array and is sensed by the photoelectric detection module 9 through the sensing optical fiber 11, the detection data of the photoelectric detection module 9 can be continuously changed, when the detection data of the photoelectric detection module 9 is reduced to be lower than the intensity threshold value, the direct sunlight state is ended, the main control module 4 can control the dimming baffle 1 to rotate, the dimming baffle 1 is staggered with the receiving mirror 5, the receiving mirror 5 can be further operated normally, and the laser radar can detect the atmosphere again. Whether the direct sunlight state is completely ended can be accurately judged based on detection data of the photoelectric detection module 9, the direct sunlight duration is not required to be estimated additionally, the phenomenon that the light modulation baffle 1 is staggered with the receiving mirror 5 due to the error estimation of the direct sunlight duration is controlled in advance can be avoided, and further the damage to the echo receiving optical fiber 10, the sensing optical fiber 11 and the photoelectric detection module 9 is caused, so that the laser radar is protected more accurately and fully.
The invention can protect the echo receiving optical fiber 10 and the photoelectric detection module 9 when the laser radar is subjected to direct sunlight, avoid damage to the echo receiving optical fiber 10 and the photoelectric detection module 9 caused by overhigh illumination intensity, and is applicable to the laser radar deployed on mobile platforms such as vehicles, ships and the like and the laser radar for scanning detection without estimating the direct sunlight time. After the direct sunlight is over, the dimming baffle 1 is reset, so that the laser radar can continue to work.
For the main control module 4 can drive smoothly and adjust luminance baffle 1 and rotate, adjust luminance baffle 1 and be connected with and be used for driving the pivoted drive assembly of baffle 1 that adjusts luminance, drive assembly includes electric connection's step motor 2 and motor driver, wherein step motor 2's output shaft and baffle 1 fixed connection that adjusts luminance to step motor 2's output shaft and the central line of baffle 1 that adjusts luminance and first unthreaded hole array all stagger, motor driver and main control module 4 electric connection. More specifically, the stepper motor 2 is disposed at a side of the receiving mirror 5, and the output shaft of the stepper motor 2 is staggered with the central lines of the first unthreaded hole array and the dimming baffle 1, so as to ensure that the stepper motor 2 can drive the dimming baffle 1 to rotate when in action, and ensure that the dimming baffle 1 can partially shield or stagger the receiving mirror 5 in the rotating process. Because the main states of the dimming baffle 1 are only two, namely the receiving mirror 5 is partially blocked or staggered with the receiving mirror 5, the dimming baffle 1 is driven to rotate by adopting the stepping motor 2, the control precision is higher, and the control process is simpler.
Further, the dimming baffle 1 is circular or square, and the central line of the first light hole array coincides with or is parallel to the central line of the dimming baffle 1. Considering that in practical application, the light-adjusting baffle 1 needs to be matched with the lens barrel of the receiving lens 5, and is difficult to make into geometric shapes such as regular circles or squares, at this time, the real contour line of the light-adjusting baffle 1 can be determined based on the real shape of the light-adjusting baffle 1, at least three reference points are selected on the real contour line, the three reference points are three points with the largest distance from the axis of the lens barrel among all points of the real contour line, then a reference circle is fitted based on the three reference points, and the center line of the reference circle is taken as the center line of the light-adjusting baffle 1.
Referring to fig. 2, the size of the opening of the first light hole array needs to ensure that when direct sunlight occurs, the intensity of the focused sunlight entering the receiving mirror 5 is higher than the detection limit of the photo-detection module 9, that is, the focused sunlight can be detected by the photo-detection module 9, that is, the intensity is lower than the damage threshold of the photo-detection module 9, that is, the photo-detection module 9 cannot be damaged due to the excessively high intensity, and in addition, the energy density of the focused sunlight cannot be greater than the energy density safety threshold of the laser radar optical element. The first light hole array comprises a plurality of first light holes, all the first light holes are uniformly distributed along the circumferential direction of the central line of the dimming baffle 1, a distance is reserved between the central line of the first light holes and the central line of the dimming baffle 1, and a shielding area capable of shielding the echo receiving optical fiber 10 is enclosed by all the first light holes. Specifically, all the first light holes can form a light-transmitting area which is annular and can pass sunlight, and a part of the light-adjusting baffle plate 1 positioned inside the light-transmitting area forms a shielding area, and when the light-adjusting baffle plate 1 rotates to a state of partially shielding the receiving mirror 5, the shielding area shields the echo receiving optical fiber 10.
Because the current position of the dimming baffle 1 needs to be determined by the main control module 4 after the receiving mirror 5 is sensed by sunlight through the sunlight sensing component, the side of the dimming baffle 1 is provided with the position detection module 6 for detecting the position of the dimming baffle 1, the position detection module 6 is electrically connected with the main control module 4, the position detection module 6 comprises a transmitting unit for generating a position detection signal and a receiving unit for receiving the position detection signal, and the transmission state of the position detection signal can be changed in the rotation process of the dimming baffle 1. The specific structure of the position detection module 6 may be determined according to actual needs, for example, in one embodiment, the transmitting unit includes two laser transmitters, the receiving unit includes two laser receivers, the laser transmitters and the laser receivers are correspondingly combined to form a photoelectric switch, when the dimming baffle 1 is located at a position of partially shielding the receiving mirror 5, the optical path of one of the photoelectric switches is blocked, when the dimming baffle 1 is located at a position staggered from the receiving mirror 5, the optical path of the other photoelectric switch is blocked, and one of the two photoelectric switches is always in a normal state, i.e. a state in which the optical path is not blocked. In another embodiment, the transmitting unit may transmit electromagnetic waves, which are transmitted onto the dimming baffle 1 and reflected into the receiving unit when the dimming baffle 1 is in a position partially shielding the receiving mirror 5, so that the position of the dimming baffle 1 can be determined.
Considering that the illumination state of the lidar is continuously changed, in order to accurately sense the direct sunlight state, the plurality of sensing optical fibers 11 are divided into two groups, the sensing optical fibers 11 of the same group are uniformly distributed along the circumferential direction of the echo receiving optical fiber 10, and the distances between the two groups of sensing optical fibers 11 and the echo receiving optical fiber 10 are different, namely, one group of sensing optical fibers 11 is positioned at the inner side of the other group of sensing optical fibers 11. The angle of view of the optical fiber array formed by the two groups of sensing optical fibers 11 is larger than that of the echo receiving optical fiber 10, so that when direct sunlight is about to happen, the sensing optical fiber 11 can firstly receive focused sunlight, the detection data of the photoelectric detection module 9 can also change, after the detection data are sent to the main control module 4, the main control module 4 compares the part corresponding to the sensing optical fiber 11 in the detection data with a preset intensity threshold, when the intensity threshold is reached, the position of the dimming baffle 1 is determined, and when the dimming baffle 1 needs to be rotated, the stepping motor 2 is controlled to act so as to drive the dimming baffle 1 to rotate. The device is influenced by the deployment position and the detection direction of the laser radar, and in different laser radars, the direction of the sun relative to the receiving mirror 5 is different, so that the two groups of sensing optical fibers 11 are uniformly distributed along the circumferential direction of the echo receiving optical fiber 10, and the device can be applied to the laser radars at any positions. The incident ends of the echo receiving optical fiber 10 and the sensing optical fiber 11 can be directly integrated in one optical fiber bundle 8, so that the processing difficulty can be reduced, the structural strength of the echo receiving optical fiber 10 and the sensing optical fiber 11 is ensured, and the two bundles can be separated at the emergent end, as shown in fig. 1, so that the two bundles can be respectively introduced into the photoelectric detection module 9 and the high-sensitivity detector.
In order to ensure that the parallel plate 7 can realize the function of changing the focal point position, the center lines of the group of sensing optical fibers 11, which are closer to the echo receiving optical fibers 10, enclose a circular first area, the aperture of the second optical hole is smaller than the diameter of the first area, and the aperture of the second optical hole is larger than the diameter of the echo receiving optical fibers 10. Through this setting, the second unthreaded hole can effectively change the focus position location of the sunshine that enters into in the receiver mirror 5, has equivalently enlarged the diameter of focus facula, realizes preventing damaging echo receiving optical fiber 10, response optic fibre 11 and photoelectric detection module 9's effect.
Further, in the group of sensing optical fibers 11 closer to the echo receiving optical fiber 10, two adjacent sensing optical fibers 11 are mutually attached, in the group of sensing optical fibers 11 farther from the echo receiving optical fiber 10, an outer gap is reserved between the two adjacent sensing optical fibers 11, the diameter of the sensing optical fiber 11 is larger than that of the echo receiving optical fiber 10, and an inner gap is reserved between the group of sensing optical fibers 11 closer to the echo receiving optical fiber 10 and the echo receiving optical fiber 10. Through this setting, can reduce the quantity of outer a set of response optic fibre 11 to reduce cost, and laminating each other between the outer a set of response optic fibre 11 of inlayer has contained all possible routes that sunshine is directly directed, guarantees to sense the condition that sunshine is directly directed, has eliminated the risk of passing through in the cladding of two adjacent response optic fibre of inlayer. In addition, because the action of the dimming baffle 1 requires a certain time, and the aperture of the second light hole is larger than the diameter of the echo receiving optical fiber 10, by the arrangement mode, the damage of the sensing optical fiber 11 and the photoelectric detection module 9 caused by the excessively high intensity of the sunlight directly entering the receiving mirror 5 in the action process of the dimming baffle 1 can be avoided. On this basis, the material with a high energy density safety threshold should be filled between the two sensing optical fibers 11 and between the sensing optical fiber 11 and the echo receiving optical fiber 10.
The invention also comprises a power supply module 3 for supplying power to each power consumption component, and mainly comprises a stepping motor 2, a main control module 4, a position detection module 6 and a photoelectric detection module 9. The main control module 4 can be a circuit board formed by adopting an independent processor and a proper surrounding circuit, and can also be a processing module of a laser radar directly.
The invention further provides a method for preventing direct sunlight of the atmosphere detection laser radar, which is based on the device for preventing direct sunlight of the atmosphere detection laser radar, and the method comprises S1 to S4.
S1, the main control module 4 collects detection data of the photoelectric detection module 9 in real time.
And S2, when the detection data represent that the laser radar is directly irradiated by sunlight, the main control module 4 determines the position of the dimming baffle 1. Obviously, when the laser radar is not directly irradiated by sunlight, the main control module 4 and the dimming baffle 1 do not need to act.
S3, when the dimming baffle 1 is staggered with the receiving mirror 5, the main control module 4 controls the dimming baffle 1 to rotate until the receiving mirror 5 is partially shielded, and when the dimming baffle 1 partially shields the receiving mirror 5, the main control module 4 controls the dimming baffle 1 to keep the current state.
S4, when the detection data represent that the laser radar sunlight direct irradiation process is finished, the main control module 4 determines the position of the dimming baffle 1; when the light-adjusting baffle plate 1 partially shields the receiving mirror 5, the main control module 4 controls the light-adjusting baffle plate 1 to be staggered in a rotating way until the receiving mirror 5 is not shielded any more, and when the light-adjusting baffle plate 1 is staggered, the main control module 4 controls the light-adjusting baffle plate 1 to keep the current state.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An atmospheric detection lidar direct sunlight prevention device, comprising:
The dimming baffle (1) is rotationally arranged in front of the receiving mirror (5) of the laser radar, the receiving mirror (5) can be partially shielded in the rotation process of the dimming baffle (1), and a first light hole array for controlling the light intensity of the receiving mirror (5) is arranged on the dimming baffle (1); the dimming baffle (1) is round or square, and the central line of the first unthreaded hole array coincides with the central line of the dimming baffle (1); the first light hole array comprises a plurality of first light holes, all the first light holes are uniformly distributed along the circumferential direction of the central line of the dimming baffle (1), a distance is reserved between the central line of the first light holes and the central line of the dimming baffle (1), and all the first light holes enclose a shielding area capable of shielding the echo receiving optical fiber (10);
the parallel flat plate (7) is arranged in the receiving mirror (5) and used for changing the focusing point position of direct sunlight after being focused by the lens of the receiving mirror (5), and a second light hole coaxial with the echo receiving optical fiber (10) in the receiving mirror (5) is formed in the parallel flat plate (7) and used for allowing echo light signals to pass through;
the dimming baffle (1) is arranged between the lens of the receiving mirror (5) and the parallel flat plate (7);
The sunlight sensing assembly comprises a plurality of sensing optical fibers (11) which are arranged in parallel on the periphery of the echo receiving optical fibers (10) and photoelectric detection modules (9) which are arranged at the tail ends of all the sensing optical fibers (11);
The main control module (4) is used for controlling the rotation of the dimming baffle (1) according to the detection data of the photoelectric detection module (9).
2. An atmospheric detection lidar direct sunlight prevention device according to claim 1, wherein the dimming baffle (1) is connected with a driving component for driving the dimming baffle (1) to rotate, the driving component comprises a stepping motor and a motor driver which are electrically connected, wherein an output shaft of the stepping motor is fixedly connected with the dimming baffle (1), the output shaft of the stepping motor is staggered with a central line of the dimming baffle (1) and the first light hole array, and the motor driver is electrically connected with the main control module (4).
3. An atmospheric detection lidar direct sunlight prevention device as claimed in claim 1, characterized in that a position detection module (6) for detecting the position of the dimming baffle (1) is arranged at the side of the dimming baffle (1), the position detection module (6) is electrically connected with the main control module (4), the position detection module (6) comprises a transmitting unit for generating a position detection signal and a receiving unit for receiving the position detection signal, and the transmission state of the position detection signal can be changed in the rotation process of the dimming baffle (1).
4. An atmospheric detection lidar direct sunlight prevention device according to claim 1, wherein the plurality of sensing optical fibers (11) are divided into two groups, the sensing optical fibers (11) of the same group are uniformly distributed along the circumferential direction of the echo receiving optical fiber (10), and the distances between the two groups of sensing optical fibers (11) and the echo receiving optical fiber (10) are different.
5. An atmospheric detection lidar direct sunlight prevention device according to claim 4, wherein the center line of a group of the sensing optical fibers (11) closer to the echo receiving optical fiber (10) encloses a circular first area, the aperture of the second optical hole is smaller than the diameter of the first area, and the aperture of the second optical hole is larger than the diameter of the echo receiving optical fiber (10).
6. An atmospheric detection lidar direct sunlight prevention device according to claim 4, wherein, in a group of the sensing optical fibers (11) which are closer to the echo receiving optical fiber (10), two adjacent sensing optical fibers (11) are attached to each other;
in a group of sensing optical fibers (11) far from the echo receiving optical fibers (10), an outside gap is reserved between two adjacent sensing optical fibers (11).
7. An atmospheric detection lidar direct sunlight prevention device according to claim 4, wherein the diameter of the sensing optical fiber (11) is larger than the diameter of the echo receiving optical fiber (10), and an inner gap is left between a group of sensing optical fibers (11) closer to the echo receiving optical fiber (10) and the echo receiving optical fiber (10).
8. A method for direct solar protection of an atmospheric detection lidar based on an atmospheric detection lidar direct solar protection device according to any of claims 1 to 7, characterized in that the method comprises the steps of:
The main control module (4) acquires detection data of the photoelectric detection module (9) in real time;
When the detection data represent that the laser radar is directly irradiated by sunlight, the main control module (4) determines the position of the dimming baffle (1);
when the dimming baffle (1) is staggered with the receiving mirror (5), the main control module (4) controls the dimming baffle (1) to rotate until the receiving mirror (5) is partially shielded, and when the dimming baffle (1) partially shields the receiving mirror (5), the main control module (4) controls the dimming baffle (1) to keep the current state.
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| US8791489B2 (en) * | 2012-04-05 | 2014-07-29 | Heptagon Micro Optics Pte. Ltd. | Opto-electronic module |
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| CN108731799A (en) * | 2017-04-24 | 2018-11-02 | 达帕有限公司 | Composite optical sensor with natural barrier formed by ambient light sensing chip |
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