Laser dazzler and surface light spot generation method

Abstract

The invention relates to the technical field of security and protection monitoring, and particularly discloses a laser dazzler and a surface light spot generation method, the dazzler comprises a beam expanding optical unit comprising an optical fiber collimating lens, a zoom beam expanding lens, a lens driving motor and a lens motor control panel; the galvanometer scanning unit comprises a galvanometer and a galvanometer control panel, and the galvanometer is provided with a galvanometer motor; the output port of the laser is connected with the input of the optical fiber collimating mirror through a homogenizing optical fiber; the main control board is electrically connected with the lens motor control board, the galvanometer control board and the laser respectively; and the laser ranging module is electrically connected with the main control board and is used for ranging the target and feeding ranging distance information back to the main control board. The laser ranging module is used for feeding ranging distance information back to the main control board, the main control board is used for controlling the laser device, the galvanometer scanning unit and the beam expanding optical unit, continuous large rectangular face light spots on sense organs of human eyes are emitted, and therefore the purpose of conducting dazzling striking on a target is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of security monitoring, and particularly relates to a laser dazzler and a method for generating a surface light spot. Background Art

[0002] In the field of border defense, border monitoring is a very important topic in military security. Traditional border monitoring is mostly carried out in the form of manual monitoring, such as soldiers standing guard, lurking, monitoring, patrolling, etc. However, as the military field is developing towards digital and multimedia directions. Obviously, some backward monitoring methods in the past can no longer meet the needs.

[0003] The conditions for border defense officers and soldiers to defend the border are very difficult. Each border defense company guards a front line of dozens of kilometers on average, and some border defense companies reach hundreds of kilometers. With many points and long lines, few soldiers and heavy tasks have become the primary factors restricting the difficulty of border control. In view of the current situation of border defense, it is necessary to use scientific and technological means to install and deploy certain monitoring facilities, and adopt a combination of monitoring facilities and soldiers' patrols, lurking, and observation to strengthen border management, improve the scope of border control, and expand the control space. It is necessary to set up a laser dazzler at some points where it is not easy for border defense officers and soldiers to guard and where people are likely to illegally cross the border to drive away cross-border intrusion behaviors to strengthen border management.

[0004] Based on this technical background, the present invention has studied a laser dazzler and a method for generating a surface light spot. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a laser dazzler and a method for generating a surface light spot. The dazzler uses a laser ranging module to feedback the ranging distance information to the main control board, and controls the laser, the galvanometer scanning unit and the beam expanding optical unit through the main control board, and then emits a large rectangular surface light spot that is continuous in the human eye's sense, so as to achieve the purpose of dazzling and attacking the target.

[0006] To achieve the above object, the first aspect of the present invention provides a method for a laser dazzler, including:

[0007] A beam expanding optical unit, including a fiber collimating mirror, a variable magnification beam expanding lens, a lens driving motor and a lens motor control board, the variable magnification beam expanding lens is driven by the lens driving motor, and the lens driving motor is controlled by the lens motor control board;

[0008] A galvanometer scanning unit, including a galvanometer and a galvanometer control board, the galvanometer is provided with a galvanometer motor, the galvanometer is driven by the galvanometer motor, and the galvanometer motor is controlled by the galvanometer control board;

[0009] A laser, the output port of which is connected to the input of the fiber collimating mirror through a homogenizing optical fiber;

[0010] The main control board is electrically connected to the lens motor control board, the galvanometer control board, and the laser respectively;

[0011] The laser ranging module is electrically connected to the main control board and is used to measure the distance to the target and feed back the ranging distance information to the main control board.

[0012] The second aspect of the present invention provides a method for generating a surface light spot in the above-mentioned dazzler, including:

[0013] During the galvanometer scanning process, after the ranging distance information is fed back to the main control board, the main control board controls the laser to output laser light, and the laser light is shaped and homogenized by the homogenizing optical fiber and then an elliptical light spot is output;

[0014] After the elliptical light spot is collimated by the fiber collimator, it is reflected and scanned by the galvanometer to obtain a small rectangular surface light spot;

[0015] The small rectangular surface light spot is sent into the zoom beam expander lens for beam expansion to output a large rectangular surface light spot.

[0016] The beneficial effects of the present invention include:

[0017] (1) For the laser dazzler proposed by the present invention, the laser ranging module feeds back the ranging distance information to the main control board, and the main control board controls the laser, the galvanometer scanning unit, and the beam expansion optical unit, so as to emit a continuous large rectangular surface light spot in the human eye's perception, thereby achieving the purpose of dazzling and striking the target.

[0018] (2) For the method for generating a surface light spot proposed by the present invention, the laser ranging module first measures the distance to the target, and the ranging distance information is fed back to the main control board. After the main control board obtains the distance value of the target, it adjusts the driving motor of the zoom beam expander lens in real time according to this distance value to change the focal length, and can automatically change the focal length according to different operating distances, so as to achieve a constant light spot of about 2m×4m at different distances.

[0019] (3) For the method for generating a surface light spot proposed by the present invention, the laser is shaped and homogenized by the homogenizing optical fiber and then outputs a small elliptical light spot. The light spot is collimated by the fiber collimator, reflected at a certain angle by the galvanometer, and scanned at a frequency up to the kHz level, and then enters the zoom lens for beam expansion, and finally outputs a continuous rectangular surface light spot in the human eye's perception.

[0020] Other features and advantages of the present invention will be described in detail in the following specific implementation section. Description of the Drawings

[0021] The above and other objects, features, and advantages of the present invention will become more apparent by describing the exemplary embodiments of the present invention in more detail with reference to the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the internal structure of the laser dazzler proposed by the present invention.

[0023] Figure 2 It is a schematic diagram of the overall structure of the laser dazzler in a specific embodiment proposed by the present invention.

[0024] Figure 3 It is a schematic diagram of the outlet where the overall structure of the laser dazzler in a specific embodiment communicates with the outside.

[0025] Figure 4 It is a schematic diagram of adding a sealing ring to the upper cover plate and the integrated housing in a specific embodiment of the laser dazzler proposed by the present invention.

[0026] Figure 5 It is a schematic diagram of the rainproof and dustproof lens barrel and the aviation plug interface in a specific embodiment of the laser dazzler proposed by the present invention.

[0027] Figure 6 It is a schematic diagram of the protective cover in a specific embodiment of the laser dazzler proposed by the present invention.

[0028] Figure 7 It is a schematic diagram of the heat dissipation fins and the ventilation holes in a specific embodiment of the laser dazzler proposed by the present invention. Specific Embodiment

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0030] The present invention provides a laser dazzler, as Figure 1 shown, including:

[0031] A beam expanding optical unit, including a fiber collimating mirror, a variable magnification beam expanding lens, a lens driving motor, and a lens motor control board. The variable magnification beam expanding lens is driven by the lens driving motor, and the lens driving motor is controlled by the lens motor control board;

[0032] A galvanometer scanning unit, including a galvanometer and a galvanometer control board. The galvanometer is provided with a galvanometer motor, and the galvanometer is driven by the galvanometer motor, and the galvanometer motor is controlled by the galvanometer control board;

[0033] A laser, the output port of which is connected to the input of the fiber collimating mirror through a homogenizing optical fiber;

[0034] The main control board is electrically connected to the lens motor control board, the galvanometer control board, and the laser respectively;

[0035] The laser ranging module is electrically connected to the main control board, and is used to measure the distance to the target and feedback the ranging distance information to the main control board.

[0036] In the present invention, the laser ranging module feeds back the ranging distance information to the main control board, and the main control board controls the laser, the galvanometer scanning unit, and the beam expander optical unit, so as to emit a large rectangular surface light spot that is continuous in the human eye's sense, thereby achieving the purpose of dazzling and striking the target.

[0037] According to the present invention, the main control board is a single integrated circuit board, and a motor driver and a laser driver are installed inside;

[0038] The laser is a semiconductor green laser with fiber-coupled output;

[0039] The main control board is provided with a communication interface for communicating with external devices.

[0040] According to the present invention, after the ranging distance information is fed back to the main control board, the main control board controls the laser to output laser. The laser is shaped and homogenized by a homogenizing optical fiber and then outputs an elliptical light spot. The elliptical light spot is collimated by a fiber collimator, and then reflected and scanned by a galvanometer to obtain a small rectangular surface light spot. The small rectangular surface light spot is expanded by a variable magnification beam expander lens to output a large rectangular surface light spot;

[0041] The scanning frequency is in the order of kHz. By setting the scanning frequency and the reflection angle, it is ensured that a continuous surface light spot is achieved in the human eye's sense;

[0042] The lens driving motor is a stepping motor, which is used to automatically change the focal length of the variable magnification beam expander lens according to the different operating distances.

[0043] According to the present invention, the size of the large rectangular surface light spot is 1 - 3m × 3 - 5m, and the power density is not less than 0.2mW / cm 2 .

[0044] According to the present invention, the housing of the dazzler includes an integrated housing and an upper cover plate;

[0045] The integrated housing and the upper cover plate are fixed by a plurality of screws;

[0046] The side wall of the integrated housing is provided with a laser output window and a ranging window;

[0047] The edges of the integrated housing in contact with the upper cover plate, the laser output window, and the ranging window are all provided with annular grooves for placing sealing rings, so as to seal and waterproof the dazzler;

[0048] The dazzler is also provided with a rectangular circular connector, which is an airtight and waterproof rectangular circular connector with a rubber pad at the bottom for external power supply and communication of the whole dazzler.

[0049] Preferably, a rain and dust proof lens barrel is provided at the laser output window;

[0050] The dazzler is also provided with a protective cover, a radiator and a ventilation hole;

[0051] The protective cover is arc-shaped and is used for rain shielding and sun shading;

[0052] The radiator includes heat dissipation fins and a fan. The fan is arranged inside the integrated housing, and the heat dissipation fins are arranged on the side wall of the integrated housing.

[0053] According to the present invention, the laser is provided with a temperature sensor. When the temperature detected by the temperature sensor is greater than the set value, the fan is automatically started to blow and take out the heat stored on the heat dissipation fins from the integrated housing;

[0054] The ventilation hole adopts a waterproof design to ensure the air pressure balance inside the integrated housing.

[0055] The present invention also provides a method for generating a surface light spot in the above-mentioned dazzler, including:

[0056] During the galvanometer scanning process, when the ranging distance information is fed back to the main control board, the main control board controls the laser to output laser, and the laser is output as an elliptical light spot after being shaped and homogenized by a homogenizing optical fiber;

[0057] After the elliptical light spot is collimated by a fiber collimator, it is reflected and scanned by a galvanometer to obtain a small rectangular surface light spot;

[0058] The small rectangular surface light spot is sent into a variable magnification beam expander lens for beam expansion to output a large rectangular surface light spot.

[0059] In the present invention, the laser ranging module first ranges the target, and the ranging distance information is fed back to the main control board. After the main control board obtains the distance value of the target, it adjusts the driving motor of the variable magnification beam expander lens in real time according to the distance value to change the focal length, and can automatically change the focal length according to different action distances, so as to achieve a constant light spot of about 2m×4m at different distances.

[0060] According to the present invention, it further includes:

[0061] Before the galvanometer scanning, the parameters of the laser, the fiber collimator and the variable magnification beam expander lens are theoretically calculated, and these parameters are used as the initial operating parameters during the galvanometer scanning process.

[0062] According to the present invention, the power density of the elliptical light spot is not less than 0.255mW / cm 2 ;

[0063] The large rectangular surface light spot is adjustable within the range of 10m to 200m, and the error of its size is within ±10%, and the duration does not exceed 2 seconds.

[0064] In the present invention, the laser passes through a homogenizing optical fiber for shaping and homogenizing treatment, and then outputs a small elliptical light spot. This light spot is collimated by a fiber collimator, then reflected by a galvanometer at a certain angle, and scanned at a frequency up to the kHz level, and then enters a zoom lens for beam expansion. Finally, a continuous rectangular surface light spot is output to the human eye.

[0065] The present invention will be described in more detail below through embodiments.

[0066] Embodiment 1:

[0067] As Figure 1 shown, this embodiment proposes a laser dazzler, including:

[0068] A beam expansion optical unit, including a fiber collimator, a variable magnification beam expander, a lens drive motor, and a lens motor control board. The variable magnification beam expander is driven by the lens drive motor, and the lens drive motor is controlled by the lens motor control board;

[0069] A galvanometer scanning unit, including a galvanometer and a galvanometer control board. The galvanometer is provided with a galvanometer motor, and the galvanometer is driven by the galvanometer motor, and the galvanometer motor is controlled by the galvanometer control board;

[0070] A laser, the output port of which is connected to the input of the fiber collimator through a homogenizing optical fiber;

[0071] A main control board, which is electrically connected to the lens motor control board, the galvanometer control board, and the laser respectively;

[0072] A laser ranging module, which is electrically connected to the main control board, is used to measure the distance to the target, and feed back the ranging distance information to the main control board;

[0073] In this embodiment, the main control board is a single integrated circuit board, and a motor drive and a laser drive are installed inside;

[0074] The laser is a semiconductor green laser with fiber-coupled output;

[0075] The main control board is provided with a communication interface for communicating with external devices;

[0076] After the ranging distance information is fed back to the main control board, the main control board controls the laser to output laser. This laser passes through a homogenizing optical fiber for shaping and homogenizing treatment, and then outputs an elliptical light spot. The elliptical light spot is collimated by a fiber collimator, and then a small rectangular surface light spot is obtained through reflection and scanning by the galvanometer. The small rectangular surface light spot is expanded by the variable magnification beam expander to output a large rectangular surface light spot;

[0077] The scanning frequency is on the order of kHz. By setting the scanning frequency and the reflection angle, it is ensured that a continuous surface light spot is achieved in the human eye's perception.

[0078] The lens driving motor is a stepper motor, which is used to automatically change the focal length of the zoom beam expander lens according to different working distances.

[0079] In this embodiment, in addition to ensuring that the overall structure stiffness of the dazzler can adapt to high and low temperatures, vibrations, shocks, and low-pressure environments, the overall airtightness design, rain and dust protection, and heat dissipation design are also carried out, so that the overall machine can still guarantee reliability and maintain normal operation in rainy, humid, and high-temperature areas with strong sunlight. The connection relationships of each component are as follows:

[0080] The overall machine shell adopts an integrated design, which consists of an integrated housing and an upper cover plate. The shell is processed into an integral structure, and the side panel does not need to be fixed with conventional screws. Only the upper cover plate needs to be fixed with screws, which can minimize the possibility of internal components getting water, and is beneficial to the overall airtightness design, as Figure 2 shown;

[0081] There are four outlets on the overall machine that communicate with the outside world, which may cause air leakage or water ingress, namely the aviation plug interface, the laser output window, the ranging window, and the edge of the upper cover plate, as Figure 3 shown;

[0082] A groove is annularly dug at the upper edge of the housing and the bottom of the output window mirror for placing a sealing ring. A silicone rubber sealing ring is used, which will not become brittle at a low temperature of -40°C, so the airtightness of these two outlets can be guaranteed, as Figure 4 shown;

[0083] The electrical interface for the overall machine's external power supply and communication is designed as the same aviation plug interface. This aviation plug interface selects the circular square socket aviation plug of Zhonghang Optoelectronics with airtight and waterproof performance. There is a rubber pad at its bottom, which can ensure airtightness, as Figure 5 shown;

[0084] Considering that the equipment is placed outdoors for a long time, especially in places with more dust in the western region, the laser output window may be covered with a layer of dust after long-term use, which will reduce the transmittance of the window mirror and cause the laser output power to decrease somewhat;

[0085] In order to minimize the dust adhering to the window mirror caused by reasons such as wind as much as possible, a circular lens barrel is added in the structural design, as Figure 5 shown. The length of this lens barrel is designed to be 55 mm, which can block part of the dust from entering and reduce dust adhesion; In order to extend the service life of the overall machine and reduce the influence of rain and direct sunlight on the overall machine, a protective cover is designed for the overall machine, as Figure 6As shown, it can play the role of rain and sun protection; at the same time, when the laser dazzler is installed on the turntable for operation, it is usually tilted downward for illumination, and the lens barrel is also tilted downward to prevent rain from entering the window mirror, which is also helpful for rain protection;

[0086] Since the laser dazzler is installed at the top of the column system, it is the device that is most directly exposed to the sun. Long-term exposure to the sun causes the temperature of the entire shell to rise. At noon, especially in summer, the shell may reach 60°C after being exposed to the sun.

[0087] In order to alleviate the impact of high temperature on the optical and circuit board components inside the dazzler, the heat dissipation design is taken into consideration when designing the structure of this scheme, and heat dissipation fins and fans are designed, such as Figure 7 As shown;

[0088] When the device is powered on, the whole machine is in standby or working mode. When the temperature sensor of the internal laser detects that the temperature is greater than 25°C, the fan will automatically start to blow the heat stored on the heat sink out of the housing. Especially when the laser is working, the laser itself will also generate waste heat, which will continue to increase the temperature of the whole machine. The heat sink fins and fans are designed to actively dissipate the waste heat in time.

[0089] Heat dissipation design is very important for lasers and must be considered in the design of this product. If there is no heat dissipation component, the reliability of the whole machine will be greatly reduced, and various device damage or laser failures caused by high temperature are prone to occur;

[0090] In this embodiment, the laser ranging module first measures the distance of the target, and the distance information is fed back to the main control board. After the main control board obtains the distance value of the target, it adjusts the drive motor of the zoom beam expander lens in real time according to the distance value to change the focal length. The focal length can be automatically changed according to the different working distances, so as to achieve a constant light spot of about 2m×4m at different distances;

[0091] Among them, the laser is a semiconductor green light laser with fiber coupling output. When the laser driving power board supplies power to the laser, the laser outputs laser through the optical fiber. After being shaped and homogenized by the homogenizing fiber, the laser is output as a small elliptical light spot. The light spot is collimated by the fiber collimator, and then reflected and scanned by the galvanometer to enter the zoom beam expander lens for beam expansion output; the rectangular surface light spot is formed by the small elliptical light spot after being scanned by the galvanometer at a certain angle and a certain high repetition rate. The galvanometer is driven and controlled by a high-speed motor with a frequency of up to the kHz level. By designing the scanning parameters, it can be ensured that the surface light spot is continuous in the human eye's senses; the small surface light spot scanned by the galvanometer can output a large surface light spot for beam expansion through the rear-end zoom lens. The zoom lens is controlled by a stepper motor and can automatically change the focal length according to the different working distances, thereby achieving a constant 2m×4m light spot at different distances.

[0092] The laser dazzler proposed in the embodiments of the present invention uses a laser ranging module to feedback the ranging distance information to the main control board, and controls the laser, the galvanometer scanning unit and the beam expanding optical unit through the main control board, so as to emit a large rectangular surface light spot that is continuous in the human eye's sense, thereby achieving the purpose of dazzling and striking the target.

[0093] The embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A laser dazzler, characterized in that: include: A beam expansion optical unit, comprising a fiber collimator, a variable-magnification beam expansion lens, a lens drive motor and a lens motor control board, wherein the variable-magnification beam expansion lens is driven by the lens drive motor, and the lens drive motor is controlled by the lens motor control board; A galvanometer scanning unit, comprising a galvanometer and a galvanometer control board, wherein the galvanometer is provided with a galvanometer motor, the galvanometer is driven by the galvanometer motor, and the galvanometer motor is controlled by the galvanometer control board; A laser, the output port of which is connected to the input of the fiber collimator through a homogenizing fiber; A main control board, electrically connected to the lens motor control board, the galvanometer control board and the laser respectively; The laser ranging module is electrically connected to the main control board and is used to measure the distance of the target and feed back the ranging distance information to the main control board.

2. The dazzler according to claim 1, characterized in that The main control board is a single integrated circuit board, which has a motor driver and a laser driver installed inside; The laser is a semiconductor green laser with optical fiber coupling output; The main control board is provided with a communication interface for communicating with external devices.

3. The dazzler according to claim 2, characterized in that When the ranging distance information is fed back to the main control board, the main control board controls the laser to output laser light, and the laser light is shaped and homogenized by the homogenizing optical fiber to output an elliptical light spot, and the elliptical light spot is collimated by the optical fiber collimator, and then reflected and scanned by the galvanometer to obtain a small rectangular surface light spot, and the small rectangular surface light spot is expanded by the variable magnification beam expander lens to output a large rectangular surface light spot; The scanning frequency is in the kHz range, and by setting the scanning frequency and the reflection angle, it is ensured that a continuous surface light spot is achieved in the human eye's sense; The lens driving motor is a stepping motor, which is used to automatically change the focal length of the zoom lens according to different working distances.

4. The dazzler according to claim 3, characterized in that The size of the large rectangular spot is 1-3m×3-5m, and the power density is not less than 0.2mW / cm 2 .

5. The dazzler according to claim 1, characterized in that The housing of the dazzler comprises an integrated shell and an upper cover plate; The integrated housing and the upper cover are fixed by a plurality of screws; The side wall of the integrated housing is provided with a laser output window and a distance measuring window; The edge of the integrated housing in contact with the upper cover plate, the laser output window and the distance measuring window are all provided with an annular groove, and the annular groove is used to place a sealing ring, thereby sealing and waterproofing the dazzler; The dazzler is also provided with an aviation plug interface, which is an airtight and waterproof circular square-seat aviation plug with a rubber pad at the bottom, and is used for external power supply and communication of the dazzler.

6. The dazzler according to claim 5, characterized in that The laser output window is provided with a rainproof and dustproof lens barrel; The dazzler is also provided with a protective cover, a radiator and ventilation holes; The protective cover is arc-shaped and is used to block rain and sun. The heat sink comprises heat dissipation fins and a fan, wherein the fan is arranged inside the integrated shell, and the heat dissipation fins are arranged on the side wall of the integrated shell.

7. The dazzler according to claim 6, characterized in that The laser is provided with a temperature sensor. When the temperature detected by the temperature sensor is greater than a set value, the fan is automatically started to blow away the heat stored in the heat dissipation fins and bring it out of the integrated housing; The ventilation hole is designed to be waterproof to ensure the air pressure balance in the integrated shell.

8. A method for generating a surface light spot in a dazzler according to any one of claims 1 to 7, characterized in that: include: During the scanning process of the galvanometer, when the distance information is fed back to the main control board, the main control board controls the laser to output laser light, and the laser light is shaped and homogenized by the homogenizing optical fiber to output an elliptical light spot; The elliptical light spot is collimated by the optical fiber collimator, and then reflected and scanned by the galvanometer to obtain a small rectangular surface light spot; The small rectangular surface light spot is sent to the variable-power beam expander lens for beam expansion to output a large rectangular surface light spot.

9. The method according to claim 8, characterized in that Also includes: Before the galvanometer scanning, the parameters of the laser, the optical fiber collimator and the variable-power beam expander are theoretically calculated, and the parameters are used as the initial operating parameters during the galvanometer scanning process.

10. The method according to claim 9, characterized in that The power density of the elliptical light spot is not less than 0.255 mW / cm 2 ; The large rectangular surface light spot is adjustable within the range of 10m to 200m, and the error of its size is within ±10%, and the duration does not exceed 2 seconds.

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