Far-field laser measuring device

Abstract

The invention provides a far-field laser measuring device, which relates to the technical field of laser parameter measurement and comprises a filter wheel rotating system, a laser power density detection module, a pulse width detection module and an upper computer. The filter wheel rotating system comprises a pulse width detection window and a plurality of laser wavelength detection windows; and the upper computer is used for controlling the filter wheel rotating system to rotate and receiving detection data acquired by the laser power density detection module and the pulse width detection module. The rotating filter wheel rotating system is matched with the laser power density detection module and the pulse width detection module, so that laser power density detection and laser pulse width detection processes are realized. When irradiated by laser, the laser power density detection module captures the laser at the first time, rotates based on the filter wheel rotating system, receives detection data acquired by the laser power density detection module and detection data acquired by the pulse width detection module, and realizes the rapid and accurate measurement process of laser with different wavelengths.

Description

Technical Field

[0001] The invention relates to the technical field of laser parameter measurement, and in particular to a far-field laser measurement device. Background Art

[0002] In the process of laser technology research and development, the specific parameters of the laser are the core indicators to measure the performance of the laser device, especially in the application of laser radar and laser weapons. In the laser radar system, different wavelengths correspond to different targets to be measured.

[0003] In the existing methods, the laser wavelength range is relatively large, and it is difficult to measure lasers of different wavelengths. How to quickly and accurately achieve the measurement of lasers of different wavelengths is an important issue that needs to be urgently solved in the industry. Summary of the invention

[0004] The invention provides a far-field laser measuring device for realizing the measuring process of lasers with different wavelengths quickly and accurately.

[0005] The present invention provides a far-field laser measurement device, comprising: a filter wheel rotation system, a laser power density detection module, a pulse width detection module and a host computer; The filter wheel rotation system includes a pulse width detection window and a plurality of laser wavelength detection windows, the pulse width detection module is fixedly arranged behind the pulse width detection window, and the laser power density detection module is fixedly arranged behind any one of the laser wavelength detection windows; The laser power density detection module is used to detect the laser power density through different laser wavelength detection windows when the filter wheel rotation system rotates; The pulse width detection module is used to detect the laser pulse width through the pulse width detection window; The host computer is respectively connected to the filter wheel rotation system, the laser power density detection module and the pulse width detection module for controlling the filter wheel rotation system to rotate and receiving the detection data acquired by the laser power density detection module and the detection data acquired by the pulse width detection module. The multiple laser wavelength detection windows include a blank quartz window loaded with a blank quartz plate and multiple filter windows loaded with narrow-band filters of different wavelengths.

[0006] According to a far-field laser measurement device provided by the present invention, the host computer is specifically used for: The filter wheel rotation system is controlled to rotate to an initial state to perform laser detection. When the laser power density detection module detects laser, the laser power density data obtained by the laser power density detection module and the pulse width measurement data obtained by the pulse width detection module are received. The initial state is that the pulse width detection module detects through the pulse width detection window, and the laser power density detection module detects laser through the blank quartz window.

[0007] According to a far-field laser measurement device provided by the present invention, the host computer is also used for: After receiving the laser power density data and the pulse width measurement data, the filter wheel rotation system is controlled to rotate so that the laser power density detection module detects the laser through narrow-band filters of different wavelengths, and when it is determined that the laser power density detection module detects the laser, the detected laser wavelength data is determined based on the wavelength of the narrow-band filter in the current laser wavelength detection window.

[0008] According to a far-field laser measurement device provided by the present invention, the host computer is also used for: When the laser wavelength data is obtained, the filter wheel rotation system is controlled to rotate to the initial state.

[0009] According to a far-field laser measurement device provided by the present invention, the filter wheel rotation system includes a stepper motor and a circular filter wheel; The stepper motor is connected to the circular filter wheel and is used to drive the circular filter wheel to rotate. The circular filter wheel is provided with a pulse width detection window and a plurality of laser wavelength detection windows; The multiple laser wavelength detection windows are evenly distributed on the outer side of the filter wheel, and the pulse width detection windows are distributed on the inner side of the circular filter wheel.

[0010] According to a far-field laser measurement device provided by the present invention, the wavelength of the narrow-band filter includes at least 532nm, 633nm, 660nm, 808nm, 980nm, 1064nm, 1550nm, 2.94μm, 3.39μm and 10.6μm.

[0011] According to a far-field laser measurement device provided by the present invention, the pulse width detection module includes a silicon photodiode, an indium gallium arsenide photodiode and a mercury chromium telluride photodiode.

[0012] According to a far-field laser measurement device provided by the present invention, the pulse width detection module is specifically used for: Pulse width measurement data is determined based on the light response pulse waveforms in the silicon photodiode, the indium gallium arsenide photodiode, and the mercury chromium telluride photodiode.

[0013] The present invention also provides a mobile laser measurement device, comprising the far-field laser measurement device as described above and a bearing platform; The carrying platform is connected to the laser measuring device and is used to carry the laser measuring device to perform inspection in the target area, so that the laser measuring device detects laser in the target area.

[0014] According to a mobile laser measurement device provided by the present invention, the carrying platform includes an electronically controlled pan-tilt platform and an unmanned aerial vehicle airborne platform; The electronically controlled pan / tilt platform is connected to the laser measuring device and is used to drive the laser measuring device to perform multi-angle scanning; The UAV airborne platform is connected to the electric-controlled pan-tilt platform and is used to carry the electric-controlled pan-tilt platform to move in the target area, so that the laser measuring device detects laser in the target area.

[0015] The present invention provides a far-field laser measurement device, which realizes the laser power density detection and laser pulse width detection processes by adopting a rotatable filter wheel rotation system in conjunction with a power density detection module and a pulse width detection module. Scanning in a larger range of dimensions is realized, and the laser in the surrounding environment is monitored in real time. When irradiated by laser, the laser power density detection module will capture it at the first time, and rotate based on the filter wheel rotation system, receive the detection data obtained by the laser power density detection module and the detection data obtained by the pulse width detection module, and realize the fast and accurate measurement process of lasers of different wavelengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the far-field laser measurement device provided by the present invention.

[0018] Figure 2 It is a structural schematic diagram of the filter wheel rotation system provided by the present invention.

[0019] Figure 3 It is a motion simulation schematic diagram of the filter wheel rotation system provided by the present invention.

[0020] Figure 4 It is a structural schematic diagram of the mobile laser measuring device provided by the present invention.

[0021] Figure 5It is a schematic diagram of the appearance structure of the far-field laser measurement device provided by the present invention.

[0022] Figure 6 It is a schematic diagram of the back layout of the far-field laser measurement device provided by the present invention.

[0023] Figure 7 It is a control logic schematic diagram provided by the present invention.

[0024] Reference numerals: 1: Far-field laser measurement device; 2: Electronically controlled gimbal; 3: UAV airborne platform; 4: Removable protective shell; 5: PTZ connection hole; 6: Filter wheel system front cover; 7: filter wheel rotation system; 8: blank quartz window; 9: narrow band filter; 10: reserved position for pulse width detection; 11: silicon photodiode; 12: indium gallium arsenide photodiode; 13: Mercury chromium telluride photodiode; 14: Stepper motor; 15: Power socket; 16: Main power button; 17: USB port; 18: Working indicator light; 19: Data transmission indicator light; 20: Fault indicator light; 21: Rear heat dissipation hole. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Laser, the English name of Light Amplification by Stimulated Emission of Radiation, means "light amplification by stimulated emission of radiation". The principle of laser is that when the electrons in atoms absorb energy and jump from low energy level to high energy level, and then fall back from high energy level to low energy level, the released energy is released in the form of photons. The optical properties of the photons in these excited photon beams are highly consistent, so laser has better monochromaticity, directionality and higher brightness than ordinary light sources.

[0027] Lasers have developed into two systems: continuous lasers and pulsed lasers. Continuous wave lasers can output lasers continuously and stably; while pulsed lasers output lasers in the form of pulses, which have the characteristics of high peak power and narrow pulse width. Based on laser technology, it has been widely developed in the fields of industry, medicine, scientific research and military. In the industrial field, lasers are often used in material processing, which improves production efficiency and product quality; in the medical field, lasers are widely used in minimally invasive surgeries in ophthalmology, otolaryngology and dermatology, with the advantages of less trauma and faster recovery; in the field of scientific research, laser technology can be used to develop technologies such as laser radar, laser spectroscopy and laser interferometers, which provide more accurate and sensitive measurement methods for scientific research; in the military field, laser weapons represented by laser cannons and laser blinding weapons have the characteristics of high precision, high energy and high speed, which have attracted widespread attention in the military field.

[0028] LiDAR (Light Detection And Ranging) is an active detection and ranging system that uses laser as the light source. Its working principle is very similar to that of radar, that is, the radar transmitting system sends a signal (here, a laser pulse), which is reflected by the target and collected by the receiving system. By measuring the running time (or frequency difference) of the reflected light, the distance of the target (or parameters such as relative speed) can be determined. Specifically, the laser radar emits a pulsed laser through the laser, which hits the targets such as trees, roads, bridges and buildings on the ground, causing scattering. Part of the light wave will be reflected to the receiver of the laser radar, and the distance from the laser radar to the target point will be calculated according to the laser ranging principle (such as time of flight ToF or frequency modulated continuous wave FMCW, etc.). The pulsed laser continuously scans the target object, and the data of all target points on the target object can be obtained. After imaging processing with these data, an accurate three-dimensional stereo image can be obtained.

[0029] LiDAR has the characteristics of high precision, high efficiency, high stability and reliability. In military reconnaissance, LiDAR can penetrate adverse weather conditions such as rain, fog, and dust, provide stable and reliable environmental perception capabilities, and can detect and identify enemy targets such as vehicles, personnel, and buildings at a long distance, providing important intelligence support for military operations. At the same time, LiDAR also plays an important role in military navigation and positioning. By measuring the laser signals reflected from different targets, LiDAR can determine the position and distance of the target and provide accurate navigation information for military operations. In addition to the above aspects, LiDAR has other applications in the military field. For example, LiDAR can play an important role in chemical warfare agent detection and underwater detection. In addition, LiDAR can also be used in military communications and interference to improve the confidentiality and anti-interference capabilities of military communications.

[0030] Laser weapons are directed energy weapons that use directed laser beams to directly damage or disable targets. The working principle of laser weapons is based on the characteristics of lasers, namely the focusing of light and the high concentration of energy density. The amplified light beam is focused through an optical system to concentrate the energy of the beam into a very small area, producing high temperature, high pressure or high energy effects, which are used to kill, destroy or interfere with targets. As a tactical weapon, laser has many unique advantages. First, it can fly at the speed of light and can hit the target quickly. Laser weapons do not need to carry ammunition. As long as there is enough electricity, there is theoretically unlimited ammunition. Therefore, its operational cost and safety are better than traditional weapons. Compared with commonly used interceptor missiles, laser weapons have a low cost per interception and can position airborne laser platforms above clouds, so that they can engage rockets in enemy areas or near borders, overcoming weather restrictions and atmospheric interference.

[0031] In the process of laser technology research and development, the specific parameters of the laser are the core indicators for measuring the performance of laser devices, especially in the application of laser radar and laser weapons. In the laser radar system, different wavelengths correspond to different targets to be measured; the pulse energy determines the detection distance and penetration ability of the laser radar; the pulse width determines the longitudinal resolution of the laser radar; and the pulse repetition frequency determines the data acquisition frequency of the laser radar. In the laser weapon system, the laser wavelength determines the laser's penetration ability and the destructive effect on different targets; the laser beam energy and pulse width directly determine the destructive ability of the laser beam. In summary, the measurement and calibration of laser parameters play a vital role in the development of laser technology applications. By accurately controlling these parameters, the performance and application effect of the system can be optimized, and various parameters of the emitted laser in laser guidance, laser lighting, etc. can be tested, providing a reference for the accuracy, effectiveness, reliability and real-time performance of laser warning detection equipment and devices. At the same time, in the detection and response of non-cooperative laser devices, identifying the opponent's laser parameters can also grasp the non-cooperative laser information in advance and evade it, and even counter and destroy the enemy's laser targets.

[0032] In the process of laser detection, due to the wide range of laser wavelengths, it is difficult to measure lasers of different wavelengths.

[0033] In view of the defects in the related methods, the present invention provides a far-field laser measurement device. Figure 1 : is a schematic diagram of the structure of the far-field laser measurement device provided by the present invention, such as Figure 1 As shown, the device includes: a filter wheel rotating system 110 , a laser power density detection module 120 , a pulse width detection module 130 and a host computer 140 .

[0034] The filter wheel rotation system 110 includes a pulse width detection window and multiple laser wavelength detection windows, the pulse width detection module 130 is fixedly arranged behind the pulse width detection window, and the laser power density detection module 120 is fixedly arranged behind any one of the laser wavelength detection windows.

[0035] It should be noted that the pulse width detection module 130 can detect the laser pulse width through the pulse width detection window in the filter wheel rotation system 110 .

[0036] The filter wheel rotating system 110 can rotate under control, so that the laser power density detection module can detect the laser power density through different laser wavelength detection windows when the filter wheel rotating system rotates.

[0037] The laser power density detection module 120 is used to detect laser power density through different laser wavelength detection windows when the filter wheel rotation system rotates.

[0038] The filter wheel rotating system 110 is composed of a blank quartz window for loading a blank quartz plate and a plurality of filter windows for loading narrow-band filters of different wavelengths.

[0039] Different detection functions can be achieved based on different laser wavelength detection windows.

[0040] Specifically, the blank quartz window can be used to capture laser light of any wavelength. When laser light is irradiated to the far-field laser measurement device, the laser light is incident through the blank quartz window in the filter wheel and is received by the laser power density detection module 120 .

[0041] After capturing the laser, the filter wheel rotation system 110 rotates, and the laser power density detection module 120 detects the laser based on filters with different filtering wavelengths. When the laser power density detection module 120 receives the laser signal again, it automatically records the position of the filter wheel at this moment, and the corresponding narrow-band filter wavelength at this position is the wavelength of the laser. It can be understood that the filter can filter wavelengths that are not corresponding to the filter.

[0042] The pulse width detection module 130 is used to detect the laser pulse width through the pulse width detection window, so as to obtain the laser pulse width measurement data.

[0043] The host computer 140 is respectively connected to the filter wheel rotation system 110 , the laser power density detection module 120 , and the pulse width detection module 130 for communication.

[0044] The host computer 140 is used to implement the control process of laser measurement and receive measurement data.

[0045] The host computer 140 can control the filter wheel rotation system 110 to rotate, so that the laser power density detection module 120 detects the laser based on filters with different filtering wavelengths to obtain detection data, and receives the detection data obtained by the pulse width detection module 130 through the pulse width detection window.

[0046] The present invention provides a far-field laser measurement device, which realizes the laser power density detection and laser pulse width detection processes by adopting a rotatable filter wheel rotation system in conjunction with a power density detection module and a pulse width detection module. Scanning in a larger range of dimensions is realized, and the laser in the surrounding environment is monitored in real time. When irradiated by laser, the laser power density detection module will capture it at the first time, and rotate based on the filter wheel rotation system, receive the detection data obtained by the laser power density detection module and the detection data obtained by the pulse width detection module, and realize the fast and accurate measurement process of lasers of different wavelengths.

[0047] In one embodiment, the host computer is specifically used to: control the filter wheel rotation system to rotate to an initial state to perform laser detection, and when the laser power density detection module detects laser, receive the laser power density data obtained by the laser power density detection module and the pulse width measurement data obtained by the pulse width detection module, wherein the initial state is that the pulse width detection module detects through the pulse width detection window, and the laser power density detection module detects laser through the blank quartz window.

[0048] After receiving the laser power density data and the pulse width measurement data, the filter wheel rotation system is controlled to rotate so that the laser power density detection module detects the laser through narrow-band filters of different wavelengths, and when it is determined that the laser power density detection module detects the laser, the detected laser wavelength data is determined based on the wavelength of the narrow-band filter in the current laser wavelength detection window.

[0049] When the laser wavelength data is obtained, the filter wheel rotation system is controlled to rotate to the initial state.

[0050] Specifically, the filter wheel rotation system is controlled to rotate to the initial state. The laser power density detection module directly captures the laser signal through the white quartz window. When the laser is irradiated to the laser measurement device, the laser will be incident through the blank quartz window in the filter wheel rotation system and received by the laser power density detection module. At this time, the movement of the electric control pan / tilt is automatically locked immediately, and the acquired signal is directly transmitted to the host computer for the next step of processing.

[0051] After the laser power density detection module finds and locks the laser, the pulse width detection module will also detect the pulse gate width of the laser at the same time. The pulse width detection module can use high-speed silicon photodiodes, indium gallium arsenide photodiodes and mercury chromium telluride photodiodes as detection devices for ultraviolet-visible light, near-infrared and mid-to-far infrared bands respectively. A roughened quartz sheet is installed on the window corresponding to the filter wheel rotation system to protect the photodiode. During the pulse width measurement process, the filter wheel rotation system rotates continuously, and the high-speed silicon photodiode, indium gallium arsenide photodiode and mercury chromium telluride photodiode will capture the pulse width signal of the non-cooperative laser accordingly. After further processing by the oscilloscope, the laser pulse width data will be uploaded to the host computer for the next step of processing.

[0052] After the laser power detection and laser pulse width detection are completed, the filter wheel rotation system starts to rotate at a set speed under the control of the host computer. In the rotating state, narrow-band filters of different wavelengths will pass in front of the laser power density detection module at a uniform speed. When the laser power detection module receives the laser signal again, it automatically records the position of the filter wheel at this moment. The wavelength of the narrow-band filter corresponding to this position is the wavelength of the non-cooperative laser.

[0053] After completing the parameter detection of the laser, the processed data can be automatically saved and archived in the form of charts and data based on the host computer. Then the filter wheel rotation system needs to be returned to the initial state to ensure that the window of the laser power density detection module is facing the blank quartz window position of the filter wheel rotation system to ensure that the next laser parameter measurement can be started at any time.

[0054] In one embodiment, the filter wheel rotation system includes a stepper motor and a circular filter wheel; the stepper motor is connected to the circular filter wheel to drive the circular filter wheel to rotate, and a pulse width detection window and a plurality of laser wavelength detection windows are provided on the circular filter wheel; the plurality of laser wavelength detection windows are evenly distributed on the outer side of the filter wheel, and the pulse width detection windows are distributed on the inner side of the circular filter wheel.

[0055] The overall structure of the filter wheel rotation system is as follows: Figure 2The structural schematic diagram of the filter wheel rotation system provided by the present invention is shown. In the initial working state, the blank quartz window 8 is located at the front end of the optical window of the laser power detection device to ensure that non-cooperative lasers of any wavelength can be captured. The inner side of the filter wheel automatic rotation system is hollowed out to provide a pulse width detection reserved position 10 for the pulse width detection module. The filter wheel rotation system 7 can be provided with a plurality of narrow-band filters 9, and the narrow-band filters 9 are placed in the narrow-band filter window. The window is provided with an SM1 thread inside to specifically place narrow-band filters 9 of different wavelengths. After placement, the specific wavelength position of the narrow-band filter 9 will be recorded in the host computer, and the stepper motor driver will be controlled to perform speed and position control, and the real-time position and speed of the filter wheel rotation system 7 will be fed back to identify the filter lens 9 at the current position, thereby realizing the judgment of the laser band.

[0056] Figure 3 The motion simulation diagram of the filter wheel rotation system provided by the present invention is shown in the figure. The stepper motor 14 drives the filter wheel automatic rotation system 7 to rotate, so as to realize the automatic switching of the narrow-band filter 9 at the front end of the far-field laser measurement device. The pulse width detection module includes a silicon photodiode, an indium gallium arsenide photodiode and a mercury chromium telluride photodiode. The pulse width detection reserved position 10 includes a silicon photodiode 11, an indium gallium arsenide photodiode 12, and a mercury chromium telluride photodiode 13, all of which are protected by frosted quartz sheets and placed on the inner circumference of the filter wheel rotation system 7, and serve as detection devices for the ultraviolet-visible light, near infrared, and mid-to-far infrared bands, respectively.

[0057] In one embodiment, the wavelengths of the narrowband filter include at least 532 nm, 633 nm, 660 nm, 808 nm, 980 nm, 1064 nm, 1550 nm, 2.94 μm, 3.39 μm, and 10.6 μm.

[0058] It is understandable that the filter wheel rotation system starts to rotate at a set speed under the control of the host computer. The filter wheel in the rotating state will pass narrow-band filters of different wavelengths in front of the laser power density detection module at a uniform speed. When the laser power detection module receives the laser signal again, it automatically records the position of the filter wheel at this moment, and the corresponding narrow-band filter wavelength at this position is the wavelength of the non-cooperative laser.

[0059] Based on the setting of the above-mentioned narrow-band filters of different commonly used wavelengths, the process of determining the laser wavelength can be realized.

[0060] In one embodiment, the pulse width detection module includes a silicon photodiode, an indium gallium arsenide photodiode and a mercury chromium telluride photodiode. The pulse width detection module determines pulse width measurement data based on light response pulse waveforms in the silicon photodiode, the indium gallium arsenide photodiode and the mercury chromium telluride photodiode.

[0061] High-speed silicon photodiodes, indium gallium arsenide photodiodes and mercury chromium telluride photodiodes are used as detectors for the ultraviolet-visible light, near infrared and mid- and far infrared bands, respectively. During the measurement process, the filter wheel rotation system is continuously rotated to collect photoelectric signals through the scattered light path, and the pulse width of the optical signal is obtained based on the light response pulse waveform on the silicon, indium gallium arsenide and mercury chromium telluride detectors.

[0062] The present invention also provides a mobile laser measuring device, such as Figure 4 As shown in the structural schematic diagram of the mobile laser measurement device provided by the present invention, the whole device includes a far-field laser measurement device 1, an electric-controlled pan-tilt platform 2, and an unmanned aerial vehicle airborne platform 3. When not in operation, the far-field laser measurement device 1 and the unmanned aerial vehicle airborne platform 3 are uniformly placed in a portable protective box for storage and transportation, and the operation of the electric-controlled pan-tilt platform 2 is controlled by the host computer software.

[0063] The specific appearance and structure of the far-field laser measurement device 1 are as follows: Figure 5 As shown in the schematic diagram of the appearance structure of the far-field laser measurement device provided by the present invention, a detachable protective shell 4 of a composite material forms a main frame, a reserved pan / tilt connection hole 5 is located at the upper end of the main detachable protective shell 4, a front cover plate 6 of a filter wheel system can prevent stray light from entering the optical windows of each detection device, and a filter wheel rotation system 7 is placed at the front end of the far-field laser measurement device 1 and inside the front cover plate 6 of the filter wheel system.

[0064] The back of the far-field laser measuring device 1 is arranged as follows Figure 6 The back layout diagram of the far-field laser measurement device provided by the present invention is shown. The AC220V power socket 15 provides overall power supply for the far-field laser measurement device 1, and the main power button 16 is placed in the middle position, on the right side of the AC220V power socket 15. The USB interface 17 is placed on the far right, which is responsible for transmitting the measurement unit test data with the host computer. After a series of internal structural automatic control and processing of the host computer, the relevant parameters are directly transmitted and recorded through the USB interface 17. The working indicator light 18, the data transmission indicator light 19 and the fault indicator light 20 can directly display the current working state of the far-field laser measurement device, and the user can quickly understand the overall condition of the instrument, so as to make corresponding operations or adjustments. After the host computer issues an instruction to enter the working mode, a series of instructions will be carried out inside the far-field laser measurement device 1. After the operation is completed, the working indicator light 18 will enter the constant light mode for confirmation. When the host computer issues instructions and receives measurement data, the data transmission indicator light 19 will provide feedback in the form of flashing. When the instrument fails or an abnormal situation occurs, the fault indicator light 20 will light up, which helps to find and solve the fault in time to prevent the situation from further deteriorating. The back of the far-field laser measurement device also includes rear heat dissipation holes 21 for heat dissipation.

[0065] Optionally, the host computer software specific control logic is as follows Figure 7The control logic diagram provided by the present invention is shown in the following figure. The software control program of the host computer can mainly realize the following functions: Read the collected signal data through the USB interface; Data filtering, data operation; Data preservation, historical data extraction; Data is displayed in real time and curves are shown.

[0066] The host computer software can be implemented through the operating system. The detection sequence of the overall system is: energy detection > pulse width detection > wavelength detection. The final detection data is displayed in the form of tables and curves to facilitate data reading and storage.

[0067] Preparation before testing. The far-field laser measuring device is connected to the tripod through an electric-controlled pan-tilt platform. Turn on the main control power of the measuring device, connect the portable computer to the testing device through a USB cable, check the serial port status, and check whether the indicators on the back panel of the measuring device are normal. After ensuring that the communication of each device is normal, the laser measuring device is put into working state through the upper computer software, and the electric-controlled pan-tilt platform starts to rotate at a constant speed, waiting to capture the non-cooperative laser.

[0068] Laser power detection. After the far-field laser measurement device enters the inspection and scanning state, the measurement and recording of the entire laser parameters will be realized in an automatic detection manner. After the pan / tilt enters the rotation state, the laser power density detection module will simultaneously enter the detection mode. At this time, the filter wheel remains locked in the initial position, and the laser power meter directly captures the non-cooperative strong field laser signal through the quartz window. When a non-cooperative strong field laser irradiates the laser measurement device, the laser will be incident through the blank quartz window in the filter wheel and received by the laser power detection module. At this time, the program will immediately automatically lock the movement of the electronically controlled pan / tilt, and transmit the acquired signal directly to the host computer for the next step of processing.

[0069] Laser pulse width detection. After the power density detection module finds and locks the laser, the pulse width detection module will also detect the pulse gate width of the non-cooperative laser at the same time. The pulse width detection module uses high-speed silicon photodiodes, indium gallium arsenide photodiodes and mercury chromium telluride photodiodes as detection devices for ultraviolet-visible light, near-infrared and mid-to-far infrared bands respectively. The three photodiodes are arranged as shown in the figure, and a roughened quartz sheet is installed on the window corresponding to the filter wheel to protect the photodiode. During the pulse width measurement process, the filter wheel rotates continuously, and the high-speed silicon photodiode, indium gallium arsenide photodiode and mercury chromium telluride photodiode will capture the pulse width signal of the non-cooperative laser accordingly. After further processing by the oscilloscope, the laser pulse width data will be uploaded to the host computer for the next step of processing.

[0070] Laser wavelength detection. After the laser power detection and laser pulse width detection are completed, the filter wheel starts to rotate at a set speed under the control of the host computer program and the main control board. The rotating filter wheel will pass narrowband filters of different wavelengths through the blank window position in front of the laser power meter at a uniform speed. When the laser power detection module receives the laser signal again, the main control board will automatically record the position of the filter wheel at this moment. The corresponding narrowband filter wavelength at this position is the wavelength of the non-cooperative laser.

[0071] System control and data processing. The system control is mainly composed of the main control board and the host computer. The main control board is mainly responsible for the control of the motor, pan-tilt and power supply, and the host computer is mainly responsible for controlling the work of the main control board and other modules and processing data. In system control, the main control board is responsible for the distribution of power supply voltage and the rotation state control of the electric pan-tilt, and the host computer is responsible for releasing the working status signal; when the laser power module captures the strong field laser signal of the non-cooperative party, the main control board will receive the command of the host computer to make the electric pan-tilt stop and lock the laser direction; when the laser wavelength is detected, the main control board is responsible for the rotation of the filter wheel and the feedback of the rotation information, and the host computer is responsible for the next calculation based on the information fed back by the main control board; in the process of laser pulse width detection, the signal fed back by the photodiode directly enters the host computer for information processing. In data processing, the main control board is responsible for recording the rotation information of the filter wheel, the host computer is responsible for recording and calculating the power density, wavelength and pulse width of the strong field laser of the non-cooperative party, and the oscilloscope is responsible for converting the electrical signal in the photodiode into a pulse width signal for calculation and storage by the host computer.

[0072] Work after the test. After completing the parameter test of the non-cooperative strong field laser, the host computer needs to automatically save and archive the processed data in the form of charts and data, and then return the filter wheel to the initial position to ensure that the window of the laser power detection module is facing the blank quartz window position of the filter wheel, so that the next laser parameter measurement can be started at any time.

[0073] The far-field laser measurement device has the following advantages: Rapid and concealed detection of all scenarios on land, sea and air. The housing of this device is equipped with a reserved position for pan / tilt adapter.

[0074] It can be carried on aerial drones, surface ships and ground combat units to adapt to various battlefield environments and mission requirements. When the device is carried on a military drone, due to its small size, low flight altitude and high speed, it can stay in the air for a long time for detection, making it difficult to be detected by enemy radar or reconnaissance equipment, and can covertly perform the task of strong light confrontation with non-cooperative targets.

[0075] Real-time detection of wide-band narrow-band lasers. The device uses an automatic continuous filter wheel in conjunction with a power detection module to detect laser wavelengths. There are 8 holes on the filter wheel, and narrow-band filters of corresponding wavelengths are placed on the corresponding holes, which can cover commonly used wavelength filters such as 532nm, 633nm, 660nm, 808nm, 980nm, 1064nm, 1550nm, 2.94μm, 3.39μm, and 10.6μm. When the corresponding wavelength laser passes through the narrow-band filter and is captured by the laser power detection module, the wavelength of the incident laser can be correctly determined.

[0076] Full-band and wide-range spontaneous artery width detection. The device uses high-speed silicon photodiodes, indium gallium arsenide photodiodes and mercury chromium telluride photodiodes as detection devices for ultraviolet-visible light, near infrared and mid- and far infrared bands respectively. During the measurement process, the filter wheel is rotated continuously to collect photoelectric signals through the scattered light path, and the pulse width of the optical signal is obtained based on the light response pulse waveform on the silicon, indium gallium arsenide and mercury chromium telluride detectors.

[0077] High-energy wide-spectrum laser power energy detection. The device uses a thermoelectric ultra-wide spectrum (0.19μm-12μm) probe to detect far-field laser power. The power range covers 100μW~10W. The laser power detection module consists of an optical window, an attenuation plate, a probe and a fixed frame. The measurement of laser energy is based on power measurement. According to the formula Energy measurements can be performed on commonly used lasers.

[0078] Automatic inspection of non-cooperative lasers at all angles. The device is placed on a 360° automatic pan-tilt table and driven by a stepper motor to rotate at a fixed speed. Through automatic rotation, this laser measurement device can scan in a wider range of dimensions and monitor non-cooperative laser units in the surrounding environment in real time. When irradiated by a non-cooperative laser, the laser power module will capture it at the first time, and the system will immediately lock the angle of the pan-tilt table and filter wheel to lock the non-cooperative laser.

[0079] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0080] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A far-field laser measurement device, characterized in that: include: Filter wheel rotation system, laser power density detection module, pulse width detection module and host computer; The filter wheel rotation system includes a pulse width detection window and a plurality of laser wavelength detection windows, the pulse width detection module is fixedly arranged behind the pulse width detection window, and the laser power density detection module is fixedly arranged behind any one of the laser wavelength detection windows; The laser power density detection module is used to detect the laser power density through different laser wavelength detection windows when the filter wheel rotation system rotates; The pulse width detection module is used to detect the laser pulse width through the pulse width detection window; The host computer is respectively connected to the filter wheel rotation system, the laser power density detection module and the pulse width detection module for controlling the filter wheel rotation system to rotate and receiving the detection data acquired by the laser power density detection module and the detection data acquired by the pulse width detection module. The multiple laser wavelength detection windows include a blank quartz window loaded with a blank quartz plate and multiple filter windows loaded with narrow-band filters of different wavelengths.

2. The far-field laser measurement device according to claim 1, characterized in that: The host computer is specifically used for: The filter wheel rotation system is controlled to rotate to an initial state to perform laser detection. When the laser power density detection module detects laser, the laser power density data obtained by the laser power density detection module and the pulse width measurement data obtained by the pulse width detection module are received. The initial state is that the pulse width detection module detects through the pulse width detection window, and the laser power density detection module detects laser through the blank quartz window.

3. The far-field laser measurement device according to claim 2, characterized in that: The host computer is also used for: After receiving the laser power density data and the pulse width measurement data, the filter wheel rotation system is controlled to rotate so that the laser power density detection module detects the laser through narrow-band filters of different wavelengths, and when it is determined that the laser power density detection module detects the laser, the detected laser wavelength data is determined based on the wavelength of the narrow-band filter in the current laser wavelength detection window.

4. The far-field laser measurement device according to claim 3, characterized in that: The host computer is also used for: When the laser wavelength data is obtained, the filter wheel rotation system is controlled to rotate to the initial state.

5. The far-field laser measurement device according to claim 1, characterized in that: The filter wheel rotation system includes a stepper motor and a circular filter wheel; The stepper motor is connected to the circular filter wheel and is used to drive the circular filter wheel to rotate. The circular filter wheel is provided with a pulse width detection window and a plurality of laser wavelength detection windows; The multiple laser wavelength detection windows are evenly distributed on the outer side of the filter wheel, and the pulse width detection windows are distributed on the inner side of the circular filter wheel.

6. The far-field laser measurement device according to claim 1, characterized in that: The wavelengths of the narrowband filter include at least 532 nm, 633 nm, 660 nm, 808 nm, 980 nm, 1064 nm, 1550 nm, 2.94 μm, 3.39 μm and 10.6 μm.

7. The far-field laser measurement device according to claim 1, characterized in that: The pulse width detection module includes a silicon photodiode, an indium gallium arsenide photodiode and a mercury chromium telluride photodiode.

8. The far-field laser measurement device according to claim 7, characterized in that: The pulse width detection module is specifically used for: Pulse width measurement data is determined based on the light response pulse waveforms in the silicon photodiode, the indium gallium arsenide photodiode, and the mercury chromium telluride photodiode.

9. A mobile laser measurement device, comprising the far-field laser measurement device according to any one of claims 1 to 8 and a carrying platform; The carrying platform is connected to the laser measuring device and is used to carry the laser measuring device to perform inspection in the target area, so that the laser measuring device detects laser in the target area.

10. The mobile laser measuring device according to claim 9, characterized in that: The carrying platform includes an electronically controlled gimbal and a UAV airborne platform; The electronically controlled pan / tilt platform is connected to the laser measuring device and is used to drive the laser measuring device to perform multi-angle scanning; The UAV airborne platform is connected to the electric-controlled pan-tilt platform and is used to carry the electric-controlled pan-tilt platform to move in the target area, so that the laser measuring device detects laser in the target area.

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