Direct sunlight detection device for laser radar and receiving mirror protection device

Abstract

A direct sunlight detection device for a laser radar comprises a fixing seat and an incidence straight tube which are detachably connected, a light guide channel is formed in the middle of the fixing seat, the light guide channel and the incidence straight tube are coaxially arranged and communicated with each other, and a light guide lens is fixedly arranged in the light guide channel. A light intensity sensor is arranged on the side, back on to the incidence straight barrel, of the light guide lens and electrically connected with a controller. According to the direct sunlight detection device for the laser radar and the receiving mirror protection device provided by the utility model, the direct sunlight detection device can detect whether direct sunlight occurs or not, and then sends a warning signal to the laser radar when the direct sunlight occurs, so that a photoelectric detector of the laser radar is prevented from being damaged by the direct sunlight, and the service life of the laser radar is prolonged. The receiving mirror protection device can shield the receiving mirror when the laser radar is directly irradiated by sunlight, so that the receiving mirror is prevented from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser radar technical field, specifically is a kind of sunlight direct detection device and receiving mirror protection device for laser radar. BACKGROUND

[0002] In photoelectric detection field, such as laser radar, infrared thermal imager and other equipment are vulnerable to strong sunlight, especially atmospheric waveguide laser radar, is detected to weak light and is completed photoelectric conversion by photomultiplier tube, since it is abnormally sensitive to light, when strong sunlight is directly incident, photomultiplier tube can cause permanent damage, so it needs to protect strong light direct.

[0003] In prior art, the means for detecting strong sunlight direct mainly include: 1, adopt sunlight angle sensing equipment to detect the incidence angle of sunlight by complex optics and optoelectronic devices;2, adopt analog calculation method to calculate the altitude angle and azimuth angle of sun by longitude, latitude, date and time information.The first method is difficult to apply due to high cost, cannot be embedded and the installation angle of laser radar is difficult to guarantee level for different installation sites.Therefore, the second analog calculation method is generally used in the industry, which needs accurate longitude and latitude and real-time clock.Longitude and latitude often need to be input manually, and real-time clock needs to be guaranteed by battery and integrated circuit or obtained through network.If the equipment is powered off, it is very easy to cause calculation error, so the reliability is poor.In addition, when atmospheric waveguide laser radar is installed on a ship, the ship will sway at a certain angle with the waves on the sea, so the above two methods cannot be used to measure and calculate the angle of sun. UTILITY MODEL CONTENTS

[0004] In order to solve the problems in the prior art, the utility model provides a sunlight direct detection device and a receiving mirror protection device for laser radar, which can detect whether sunlight direct occurs, and then send a warning signal to the laser radar when sunlight direct occurs, to avoid damage to the photoelectric detector of the laser radar, and the receiving mirror protection device can shield the receiving mirror when the laser radar is directly irradiated by sunlight, to avoid damage to the receiving mirror.

[0005] In order to achieve the above purpose, the utility model adopts the following specific scheme: a sunlight direct detection device for laser radar, comprising a detachably connected fixing seat and an incident straight cylinder, a light guide channel is formed in the middle part of the fixing seat, the light guide channel and the incident straight cylinder are coaxially arranged and interconnected, a light guide lens is fixedly arranged in the light guide channel, a light intensity sensor is arranged on the side of the light guide lens away from the incident straight cylinder, and the light intensity sensor is electrically connected with a controller.

[0006] As a further optimization of the above-mentioned sunlight direct detection device for laser radar: the fixed seat is fixedly provided with a light inlet base, a light inlet channel is formed in the middle of the light inlet base and communicates with the light guide channel, and the light inlet base is further fixedly connected with a sleeve that communicates with the light inlet channel, and the incident straight cylinder is inserted into the sleeve.

[0007] As a further optimization of the above-mentioned sunlight direct detection device for laser radar: the inside of the sleeve is provided with a light inlet hole plug fixedly connected with the light inlet base, and a distance is left between the light inlet hole plug and the sleeve to form a mounting space for accommodating the incident straight cylinder.

[0008] As a further optimization of the above-mentioned sunlight direct detection device for laser radar: the light inlet base is fixedly connected with the fixed seat by a plurality of connecting bolts uniformly distributed along the circumferential direction of the incident straight cylinder.

[0009] As a further optimization of the above-mentioned sunlight direct detection device for laser radar: an expansion part is arranged in the middle of the light guide channel, a lens mounting seat is threadedly connected to one end of the light guide channel away from the incident straight cylinder, the light guide lens is arranged on the lens mounting seat, and the lens mounting seat can abut the light guide lens against the expansion part.

[0010] As a further optimization of the above-mentioned sunlight direct detection device for laser radar: the controller is electrically connected with a relay.

[0011] A receiving mirror protection device for laser radar, comprising a sunlight direct detection mechanism and a lens shielding protection mechanism; the sunlight direct detection mechanism comprises a fixed seat and an incident straight cylinder connected detachably, a light guide channel is formed in the middle of the fixed seat and coaxially arranged with the incident straight cylinder and communicates with each other, a light guide lens is fixedly arranged in the light guide channel, a light intensity sensor is arranged on the side of the light guide lens away from the incident straight cylinder, and the light intensity sensor is electrically connected with a controller.

[0012] The lens shielding protection mechanism comprises an adjusting motor electrically connected with the controller, and a shielding piece is drivingly connected with the adjusting motor, and the shielding piece can shield the receiving mirror of the laser radar during rotation.

[0013] As a further optimization of the above-mentioned receiving mirror protection device for laser radar: the shielding piece is integrally connected with a plurality of extension parts, and the extension parts can one by one correspondingly shield the receiving mirror during rotation of the shielding piece.

[0014] As a further optimization of the above-mentioned receiving mirror protection device for a laser radar: the lens shielding protection mechanism comprises two limit switches, and the adjusting motor is located between the two limit switches, the shielding piece can contact the limit switches during rotation, and the receiving mirror is shielded when the shielding piece contacts one of the limit switches, and the receiving mirror is exposed when the shielding piece contacts the other limit switch.

[0015] As a further optimization of the above-mentioned receiving mirror protection device for a laser radar: the lens shielding protection mechanism comprises two limit switches, and the adjusting motor is located between the two limit switches, the shielding piece can contact the limit switches during rotation, and the receiving mirror is shielded when the shielding piece contacts one of the limit switches, and the receiving mirror is exposed when the shielding piece contacts the other limit switch.

[0016] Beneficial effects: the utility model can detect whether sunlight is directly incident, and further send a warning signal to the laser radar when sunlight is directly incident, thereby avoiding damage to the photoelectric detector of the laser radar caused by direct sunlight; the utility model uses the incident straight cylinder to isolate scattered light in the surrounding environment and light leakage of the laser radar, thereby ensuring the accuracy of the detection result; the detection device of the utility model has a simple structure, can be directly installed on the laser radar, and can swing synchronously with the laser radar even if the laser radar is swinging, so that the detection device and the laser radar are subjected to sunlight in the same way, thereby ensuring that the laser radar can be accurately detected whether it is directly incident by sunlight at all times. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is the overall structure diagram of the receiving mirror protection device;

[0018] Fig. 2 is the structure diagram of the installation base;

[0019] Fig. 3 is the connection mode diagram of the controller.

[0020] BRIEF DESCRIPTION OF DRAWINGS: 1 - incident straight cylinder, 2 - installation base, 3 - base plate, 4 - receiving mirror, 5 - adjusting motor, 6 - limit switch, 7 - shielding piece, 8 - extension, 9 - motor driver, 10 - fixing seat, 11 - light inlet base, 12 - sleeve, 13 - installation space, 14 - light inlet hole plug, 15 - connecting bolt, 16 - light guide lens, 17 - lens mounting seat, 18 - light guide channel. DETAILED DESCRIPTION

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figs. 1 to 3 As shown, a direct sunlight detection device for lidar includes a detachably connected mounting base 10 and an incident cylinder 1. A light guide channel 18 is provided in the middle of the mounting base 10. The light guide channel 18 is coaxially arranged with the incident cylinder 1 and communicates with it. A light guide lens 16 is fixedly arranged in the light guide channel 18. A light intensity sensor is arranged on the side of the light guide lens 16 facing away from the incident cylinder 1. The light intensity sensor is electrically connected to a controller.

[0023] When using this invention, it should be installed inside or outside the housing of the lidar, ensuring that the incident tube 1 is not blocked and that it is parallel to the receiving direction of the lidar. During operation, sunlight enters the incident tube 1 and the light guide channel 18, and after passing through the light guide lens 16, it illuminates the light intensity sensor. The controller senses the sunlight intensity through the light intensity sensor. When the sunlight intensity reaches a predetermined threshold, it indicates that direct sunlight has occurred. At this time, the controller can send a warning signal to the lidar's main control module, causing the lidar to take protective measures to prevent damage to the photodetector. Since only sunlight entering through the incident tube 1 can be received by the light intensity sensor, it avoids the influence of scattered light from the surrounding environment and light leakage from the lidar, ensuring accurate detection of direct sunlight. Furthermore, the lidar's main control module can be directly used as the controller to reduce circuit complexity.

[0024] This invention can detect whether direct sunlight has occurred, and then send a warning signal to the lidar when direct sunlight is present, preventing damage to the lidar's photodetector from direct sunlight. This invention utilizes an incident cylindrical tube 1 to isolate scattered light from the surrounding environment and light leakage from the lidar, thereby ensuring the accuracy of the detection results. The detection device of this invention has a simple structure and can be directly installed on the lidar. Even if the lidar oscillates, it can oscillate synchronously with the lidar. The detection device is exposed to sunlight in the same way as the lidar, thus ensuring that it can always accurately detect whether the lidar is exposed to direct sunlight.

[0025] The incident straight cylinder 1 is specifically provided in the following manner: the light inlet base 11 is fixedly arranged on the fixed seat 10, the fixed seat 10 and the light inlet base 11 form the installation base 2, the middle part of the light inlet base 11 is provided with a light inlet channel which is in communication with the light guide channel 18, the light inlet base 11 is further fixedly connected with a sleeve 12 which is in communication with the light inlet channel, and the incident straight cylinder 1 is inserted into the sleeve 12. By inserting the incident straight cylinder 1 into the sleeve 12, the direction of the incident straight cylinder 1 can be limited, so that the incident straight cylinder 1 is parallel to the receiving direction of the laser radar, and the accuracy of the detection result is prevented from being reduced due to the inclination of the incident straight cylinder 1.

[0026] In order to further limit the direction of the incident straight cylinder 1, the inside of the sleeve 12 is provided with a light inlet plug 14 which is fixedly connected with the light inlet base 11, and a distance is left between the light inlet plug 14 and the sleeve 12 to form an installation space 13 for accommodating the incident straight cylinder 1. The light inlet plug 14 cooperates with the sleeve 12 to constrain the incident straight cylinder 1 in the installation space 13, so that the incident straight cylinder 1 is parallel to the receiving direction of the laser radar as long as the incident straight cylinder 1 is smoothly inserted into the installation space 13. Further, the incident straight cylinder 1 and the light inlet plug 14 can be connected in a threaded manner, or the light inlet plug 14 can be made of a material with elasticity, such as rubber, and the incident straight cylinder 1 is pressed onto the inner wall of the sleeve 12 by the light inlet plug 14.

[0027] The specific connection manner of the light inlet base 11 and the fixed seat 10 is that the light inlet base 11 is fixedly connected with the fixed seat 10 through a plurality of connection bolts 15 which are uniformly distributed along the circumferential direction of the incident straight cylinder 1. The connection of the light inlet base 11 and the fixed seat 10 is realized through the plurality of connection bolts 15, which can not only ensure the connection strength, but also control the distance between the plurality of different positions on the light inlet base 11 and the fixed seat 10 by adjusting the depth of the connection bolts 15, so as to fully ensure that the incident straight cylinder 1 is coaxial with the light guide channel 18, and avoid the inclination of the incident straight cylinder 1 due to poor machining precision of components, and further avoid the reduction of the accuracy of the detection result.

[0028] The specific setting manner of the light guide lens 16 is that the middle part of the light guide channel 18 is provided with an expansion part, a lens mounting seat 17 is threadedly connected to the end of the light guide channel 18 away from the incident straight cylinder 1, and the light guide lens 16 is arranged on the lens mounting seat 17, and the lens mounting seat 17 can abut the light guide lens 16 against the expansion part. By arranging the expansion part and abutting the light guide lens 16 against the expansion part, the posture of the light guide lens 16 can meet the requirements, and the light guide lens 16 can smoothly transmit the sunlight to the light intensity sensor.

[0029] Further, the controller is electrically connected with a relay, and the switching state of the relay can be used as a warning signal, and the circuit structure is simpler.

[0030] The utility model further provides a kind of receiving mirror protection device for laser radar, including sunlight direct detection mechanism and lens shield protection mechanism.

[0031] Sunlight direct detection mechanism is used to detect whether sunlight direct occurs, to further judge whether laser radar will be damaged by photoelectric detector due to sunlight direct. Sunlight direct detection mechanism includes detachable connection's fixed seat 10 and incident straight cylinder 1, the middle part of fixed seat 10 is provided with light guide channel 18, light guide channel 18 is coaxially arranged with incident straight cylinder 1 and is interconnected, light guide lens 16 is fixedly arranged in light guide channel 18, light guide lens 16 is provided with light intensity sensor on the side away from incident straight cylinder 1, and the controller is electrically connected with light intensity sensor. The specific detection principle of sunlight direct detection mechanism is as described in the foregoing sunlight direct detection device part, and will not be repeated here.

[0032] Lens shield protection mechanism includes adjusting motor 5 electrically connected with controller, adjusting motor 5 is drivenly connected with shielding sheet 7, and shielding sheet 7 can shield receiving mirror 4 of laser radar during rotation. When sunlight direct detection mechanism detects that sunlight direct occurs, the warning signal output by the controller is transmitted to the main control module of laser radar, the main control module controls adjusting motor 5 to act, shielding sheet 7 is driven to rotate by adjusting motor 5, until shielding sheet 7 shields receiving mirror 4 of laser radar, so that direct sunlight is not directly irradiated on receiving mirror 4, the protection of receiving mirror 4 is realized, especially the protection of photoelectric detector.

[0033] Considering that some laser radars contain more than one receiving mirror 4, in order to ensure that all receiving mirrors 4 can be shielded, shielding sheet 7 is integrally connected with a plurality of extension parts 8, and the extension parts 8 can correspondingly shield the receiving mirrors 4 during the rotation of the shielding sheet 7. By providing the extension parts 8, all receiving mirrors 4 can be shielded during the rotation of the shielding sheet 7, and synchronous protection is realized. On the other hand, the area of the shielding sheet 7 will not be too large, and the shielding sheet 7 will be less hindered during rotation, and it is easier to install the shielding sheet 7.

[0034] In order to fully ensure that the receiving mirror 4 can be shielded during the rotation of the shielding sheet 7, the lens shield protection mechanism includes two limit switches 6, and the adjusting motor 5 is located between the two limit switches 6. The shielding sheet 7 can contact the limit switches 6 during rotation, and the shielding sheet 7 can shield the receiving mirror 4 when contacting one of the limit switches 6, and the shielding sheet 7 can expose the receiving mirror 4 when contacting the other limit switch 6. By providing two limit switches 6, the shielding sheet 7 can only have two positions, avoiding excessive rotation or insufficient rotation of the shielding sheet 7 due to poor control accuracy of the adjusting motor 5, which can further cause the receiving mirror 4 to be shielded.

[0035] The specific setting mode of the adjusting motor 5 is that: it further comprises a mounting plate fixedly connected with the shell of the laser radar, the adjusting motor 5 is fixedly arranged on one side of the mounting plate, and the output shaft of the adjusting motor 5 is connected with the shielding piece 7 after penetrating through the mounting plate, and the other side of the mounting plate is fixedly arranged with a motor driver 9 for controlling the adjusting motor 5. The motor driver belongs to the conventional technology, and the structure and principle thereof will not be described herein.

[0036] In addition, a substrate 3 can also be independently arranged inside the shell of the laser radar, and the receiving mirror 4, the sunlight direct incidence detection mechanism and the lens shielding protection mechanism are all arranged on the substrate 3.

[0037] The above description of disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A direct sunlight detection device for a laser radar, characterized by, The fixed seat (10) is fixedly provided with a light inlet base (11), the middle part of the light inlet base (11) is provided with a light inlet channel communicated with the light guide channel (18), and the light inlet base (11) is further fixedly connected with a sleeve (12) communicated with the light inlet channel.

2. A direct sunlight detection device for a lidar as claimed in claim 1, characterized in that The inside of the sleeve (12) is provided with a light inlet hole plug (14) fixedly connected with the light inlet base (11), and a distance is left between the light inlet hole plug (14) and the sleeve (12) to form a mounting space (13) for accommodating the incident straight cylinder (1).

3. A direct sunlight detection device for a lidar as claimed in claim 2, characterized in that The light inlet base (11) is fixedly connected with the fixed seat (10) through a plurality of connecting bolts (15) uniformly distributed along the circumferential direction of the incident straight cylinder (1).

4. The direct sunlight detection device for a laser radar according to claim 2, wherein The middle part of the light guide channel (18) is provided with an expansion part, and the end of the light guide channel (18) away from the incident straight cylinder (1) is threadedly connected with a lens mounting seat (17), the light guide lens (16) is arranged on the lens mounting seat (17), and the lens mounting seat (17) can abut the light guide lens (16) against the expansion part.

5. The direct sunlight detection device for a laser radar according to claim 1, wherein The controller is electrically connected with a relay.

6. The direct sunlight detection device for a laser radar according to claim 1, wherein The sunlight direct detection mechanism comprises a fixed seat (10) and an incident straight cylinder (1) which are detachably connected, a light guide channel (18) is formed in the middle part of the fixed seat (10), the light guide channel (18) is coaxially arranged with the incident straight cylinder (1) and is in communication with each other, a light guide lens (16) is fixedly arranged in the light guide channel (18), a light intensity sensor is arranged on the side of the light guide lens (16) away from the incident straight cylinder (1), and the light intensity sensor is electrically connected with a controller.

7. A receiving mirror protection device for a lidar, characterized in that The lens shielding protection mechanism comprises an adjusting motor (5) electrically connected with the controller, and the adjusting motor (5) is drivingly connected with a shielding piece (7), and the shielding piece (7) can shield the receiving mirror (4) of the laser radar in the rotating process. The shielding piece (7) is integrally connected with a plurality of extension parts (8), and the extension parts (8) can one by one correspondingly shield the receiving mirror (4) in the rotating process of the shielding piece (7). The lens shielding protection mechanism comprises two limit switches (6), and the adjusting motor (5) is located between the two limit switches (6), the shielding piece (7) can be in contact with the limit switches (6) in the rotating process, the receiving mirror (4) is shielded when the shielding piece (7) is in contact with one of the limit switches (6), and the receiving mirror (4) is exposed when the shielding piece (7) is in contact with the other limit switch (6).

8. A receiving mirror protection device for a lidar as defined in claim 7, wherein, ​ 9. A receiving mirror protection device for a lidar as defined in claim 7, wherein, ​ 10. A receiving mirror protection device for a lidar as defined in claim 7, wherein, Further comprising a mounting plate fixedly connected with the housing of the laser radar, the adjusting motor (5) is fixedly arranged on one side of the mounting plate, and the output shaft of the adjusting motor (5) is connected with the shielding piece (7) after penetrating through the mounting plate, and the other side of the mounting plate is fixedly provided with a motor driver (9) for controlling the adjusting motor (5).

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