Device and method for equivalently detecting damage of double-moving-platform intense laser to typical target material

Abstract

The invention belongs to the field of laser damage threshold measurement of a target material, and particularly relates to an equivalent detection device and method for damage of a typical target material by strong laser of a double-acting platform, and the device comprises a laser which emits a laser beam to a first spectroscope; the first spectroscope is used for dividing the incident laser into two beams, one beam is incident to the light spot analyzer, and the other beam is incident to the second spectroscope; the second spectroscope is used for dividing the incident laser into two beams, one beam is incident on the optical power meter / optical energy meter, and the other beam is incident on the damage equivalent detection device through the laser galvanometer; the damage equivalent detection device comprises a target material for receiving the laser, photosensitive photographic paper for receiving the laser after puncturing the target material and sensing light to generate an electric signal, and a light collector for preventing the laser from overflowing; and the computer is used for receiving the electric signal of the photosensitive photographic paper, controlling the on-off of the laser, recording the laser irradiation time of the target material, controlling the on-off of the light spot analyzer and the optical power meter / optical energy meter, and recording test data.

Description

Technical Field

[0001] The present application belongs to the field of laser damage threshold measurement of target materials, and in particular relates to an equivalent detection device and method for damage equivalent to typical target materials by strong laser using a dual-moving platform. Background Art

[0002] The idea of ​​using light as a weapon can be traced back to ancient times. In the Middle Ages, there was a legend that the ancient Greek scientist Archimedes used focused sunlight to ignite enemy warships. In 1960, American scientist Maiman first realized the output of the first laser beam based on a ruby ​​laser, and since then the laser field has developed rapidly.

[0003] Since the invention of lasers, they have been widely used in welding, communication, distance measurement, military radar and weapons. Laser weapons are directed energy weapons that use directed laser beams to directly damage or disable targets. They can shoot and damage distant targets, and have excellent properties such as fast, flexible, accurate and anti-electromagnetic interference. They can play a unique role in optoelectronic confrontation, air defense and strategic defense.

[0004] The research on the damage characteristics of laser weapon systems mainly targets the various threat targets that future laser weapons will face. It conducts research on the damage mechanism and damage effect of continuous and pulsed lasers, provides damage effect analysis and damage thresholds for different types of targets and different materials under the action of lasers, and provides preliminary data support for further research on laser weapon combat scenarios and combat indicator systems. Summary of the invention

[0005] In order to solve the above problems, the present application provides a double-moving platform strong laser damage equivalent detection device for typical target materials, comprising:

[0006] A laser emits a laser beam to the first beam splitter;

[0007] The first beam splitter splits the incident laser into two beams, one beam is incident on the spot analyzer, and the other beam is incident on the second beam splitter;

[0008] The second beam splitter splits the incident laser into two beams, one beam is incident on the optical power meter / optical energy meter, and the other beam is incident on the damage equivalent detection device through the laser galvanometer;

[0009] Optical power meter / optical energy meter, measuring the power / energy of incident laser;

[0010] Spot analyzer, which measures the spot size and beam quality of the incident laser;

[0011] A damage equivalent detection device, comprising a target material for receiving laser light, a photosensitive photographic paper for receiving the laser light after penetrating the target material and generating an electrical signal through light, and a light collector for preventing laser light from overflowing;

[0012] The computer receives the electrical signal from the photosensitive paper and controls the switch of the laser, records the laser irradiation time of the target material, controls the switch of the spot analyzer and the optical power meter / optical energy meter, and records the test data.

[0013] Preferably, the material of the target material includes aluminum alloy, titanium alloy, or ceramic with a certain thickness.

[0014] Preferably, the laser comprises a continuous high-power laser or a pulsed laser with high single pulse energy.

[0015] Preferably, the first beam splitter and the second beam splitter both comprise high transmission-low reflection type beam splitters with a surface coating and a known beam splitting ratio, and the beam splitting ratio is generally 99:1.

[0016] Preferably, the ratio of the laser intensity incident to the second beam splitter to the laser intensity incident to the spot analyzer is 99:1; the ratio of the laser intensity incident to the damage equivalent detection device to the laser intensity of the optical power meter / optical energy meter is 99:1.

[0017] Preferably, when the laser is a continuous laser, an optical power meter is used to measure the power of the incident laser, and when the laser is a pulsed laser, an optical energy meter is used to measure the energy of the incident laser.

[0018] A method for equivalent detection of damage to typical target materials based on strong laser, using the double-moving platform strong laser damage equivalent detection device for typical target materials:

[0019] Turn on the laser;

[0020] The spot size and beam quality of the incident laser are measured by a spot analyzer; the power / energy of the incident laser is measured by an optical power meter / optical energy meter;

[0021] The laser galvanometer is adjusted to allow the laser to radiate the target material in a preset manner;

[0022] After the laser penetrates the target material, the laser is incident on the photosensitive paper. At this time, the computer controls the laser machine to shut down and records the total time of laser irradiation on the target material.

[0023] Based on the power / energy of the incident laser, the light power / energy irradiated to the target is calculated through the beam splitting ratio of the second beam splitter, and the laser damage threshold of the target is calculated by combining the total laser irradiation time of the target with the spot size and beam quality of the incident laser.

[0024] Preferably, the method of adjusting the laser galvanometer so that the laser irradiates the target material in a preset manner includes:

[0025] Obtain the motion characteristics, optical characteristics, and outer atmospheric turbulence and boundary layer of the laser emission end and the flying target;

[0026] The equivalent amplitude and spot offset are calculated using theoretical models;

[0027] The light spot offset is used as input and the moving speed of the flying target is used as a reference to simulate the laser irradiation of the flying target to achieve the simulation of the light spot scanning offset.

[0028] The advantages of the present application include: 1. providing a device and method for equivalent detection of damage to typical target materials by strong laser on a double-moving platform under double-moving platform conditions;

[0029] 2. The laser spot size and beam quality are measured by a high-precision spot analyzer, and the THz wave parameter up-conversion signal is detected by a high-sensitivity photodetector and spectrometer. The detection noise equivalent power is small and the damage threshold measurement accuracy is high;

[0030] 3. By using photosensitive paper, combined with computer data transmission and control signals, the time for laser irradiation on the target can be accurately controlled, avoiding the traditional manual observation of the target surface state and control of the laser switching time, greatly improving the measurement accuracy of the laser damage threshold;

[0031] 4. The device used has a compact structure, works at room temperature and has a fast response speed;

[0032] Finally, a double-moving platform strong laser damage equivalent detection device for typical target materials was realized under double-moving platform conditions, which can work at room temperature, have fast response speed and high measurement accuracy, greatly improving the accuracy and measurement efficiency of laser damage threshold measurement of typical target materials such as aluminum alloy, titanium alloy and ceramics. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an equivalent detection device for damage of a typical target material by a strong laser on a double-moving platform under the double-moving platform condition of the present invention. DETAILED DESCRIPTION

[0034] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail with reference to the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0035] The device and method for equivalent detection of damage to typical target materials by strong laser using a double-moving platform under double-moving platform conditions of the present invention greatly improve the accuracy and efficiency of laser damage threshold measurement of typical target materials such as aluminum alloys, titanium alloys and ceramics. The invention discloses an equivalent detection device for damage of a typical target material by a strong laser on a double-moving platform under the condition of a double-moving platform. The laser adopts a high-power continuous laser or a pulsed laser with high single pulse energy. The first beam splitter divides the laser generated by the laser into two beams. One beam of laser is incident on a spot analyzer for measuring information such as the spot size and beam quality of the laser beam. The other beam of laser is incident on a second beam splitter and divided into two beams. One beam of laser is incident on an optical power meter / optical energy meter for measuring the power / energy of the laser incident on the target material. The other beam of laser is incident on a laser galvanometer. The laser galvanometer can change the position of the target material irradiated by the laser. The laser is incident on the target material after being deflected by the galvanometer. After the laser penetrates the target material, the laser is incident on photosensitive photographic paper. At this time, the computer controls the laser machine to shut down, and records the total time of laser irradiation on the target material, and calculates the laser damage threshold of the target material.

[0036] like Figure 1 As shown, the double-moving platform high-intensity laser damage equivalent detection device for typical target materials under the double-moving platform condition of the present invention specifically includes a laser 1 and a beam splitter and a reflector for receiving the output light of the laser 1. The laser 1 is a high-power continuous laser or a pulse laser with high single pulse energy, and the output wavelength is generally 1064nm, and the polarization state is generally linearly polarized light polarized along the z-axis direction. It is also provided with:

[0037] The first beam splitter 2 is a high-transmission-low-reflection beam splitter with a known beam splitting ratio of the surface coating, and the beam splitting ratio is generally 99:1, which is used to split the incident laser into two beams, one beam is incident on the spot analyzer 3, and the other beam is incident on the second beam splitter 4. The spot analyzer 3 is a high-sensitivity, high-precision automatic spot analyzer. With the help of special software, information such as the laser spot size and beam quality can be read on a computer. The second beam splitter 4 is also a high-transmission-low-reflection beam splitter with a known beam splitting ratio of the surface coating, and the beam splitting ratio is generally 99:1. It is used to split the incident laser into two beams, one beam is incident on the optical power meter / optical energy meter 5, and the other beam is incident on the laser galvanometer 6.

[0038] The optical power meter / optical energy meter 5 is an optical power meter / optical energy meter with high precision, high sensitivity and large dynamic range. When the laser 1 is a continuous laser, the optical power meter is used to measure the power of the incident laser. When the laser 1 is a pulsed laser, the optical energy meter is used to measure the energy of the incident laser. In combination with the beam splitting ratio of the second beam splitter 4, the optical power / energy irradiated to the target can be calculated.

[0039] The laser galvanometer 6 is used to simulate the motion characteristics and optical characteristics of the aircraft and the target, as well as the influence of changes in the external atmospheric turbulence, boundary layer, etc. The equivalent amplitude and the light spot offset are calculated using the theoretical model. The equivalent offset calculated by the theoretical model is used as input, and the target moving speed is used as a reference to simulate the laser irradiation of the target flying at a certain speed, so as to realize the simulation of the light spot scanning offset.

[0040] The target material 7 is a typical target material such as aluminum alloy, titanium alloy, ceramic, etc. with a certain thickness, which is used to study the laser damage threshold of the typical target material. The laser ablates or impacts the surface of the target material and then is incident on the photosensitive paper 8.

[0041] The surface of the photosensitive paper 8 is coated with a highly sensitive photosensitive material. When the photosensitive paper is significantly exposed or changed, a signal will be transmitted to the computer, and the computer will issue a system shutdown command. The light collector 9 is a high-power / high single pulse energy light collector, which is used to block the end of the light path to prevent the transmitted light after the target material breaks through from causing damage to the laboratory environment and test personnel. The material is a stainless steel plate.

[0042] Computer 10 and its supporting cables are an assembly workstation, which is used to receive signals transmitted by the photosensitive paper and control the switch of the laser, record the laser irradiation target time, control the switch of the spot analyzer and the optical power meter / optical energy meter, record the test data, and calculate the laser damage threshold of the target to be tested.

[0043] The working principle of the double-moving platform strong laser damage equivalent detection device for typical target materials under double-moving platform conditions of the present invention is: a high-power continuous laser or a pulsed laser with high single pulse energy is used to generate laser, and two beam splitters with a beam splitting ratio of generally 99:1 and a high-transmittance-low-reflection beam splitting film on the surface are used to split the laser beam, which are respectively used to measure the spot size and beam quality, the laser power / energy incident on the target material, and the irradiation on the target material. After the laser ablates or impacts the surface of the target material, it is incident on the photosensitive photographic paper. After the photosensitive photographic paper is exposed, the computer automatically controls the laser to turn off, and records the total laser irradiation time of the target material, calculates the laser damage threshold of the target material, and realizes high-precision strong laser damage equivalent detection of typical target materials such as aluminum alloy, titanium alloy and ceramics under double-moving platform conditions.

[0044] The method of the automatic measuring device for the laser damage threshold of a typical target material of the present invention comprises the following processes: a laser generates laser light, a first beam splitter divides the laser light generated by the laser into two beams, one beam of laser light is incident on a spot analyzer for measuring information such as the spot size and beam quality of the laser beam, another beam of laser light is incident on a second beam splitter and divided into two beams, one beam of laser light is incident on an optical power meter / optical energy meter for measuring the power / energy of the laser light incident on the target material, and another beam of laser light is incident on a laser galvanometer, which can change the position of the laser irradiating the target material, the laser light is incident on the target material after being deflected by the galvanometer, after the laser breaks through the target material, the laser light is incident on a photosensitive photographic paper, at which time a computer controls the laser machine to shut down, and records the total time of the laser irradiating the target material, calculates the laser damage threshold of the target material, and realizes high-precision strong laser damage equivalent detection of typical target materials such as aluminum alloy, titanium alloy and ceramic under double-moving platform conditions.

[0045] The specific implementation scheme of the double-moving platform strong laser damage equivalent detection device for typical target materials under the double-moving platform condition of the present invention is embodied as follows Figure 1 In the schematic diagram of a typical target laser damage threshold automatic measurement device shown in FIG. Figure 1 In the device shown, a computer controls the opening of the laser. After the photosensitive paper receives the laser, the computer automatically controls the closing of the laser and records the total time the laser is on. The spot analyzer is used to measure information such as the spot size and beam quality of the incident light, as well as the beam splitting ratio of the optical power meter / optical energy meter and the spectroscope. The power / single pulse energy of the laser incident on the target is calculated, and finally the laser damage threshold of the target is automatically calculated, which greatly improves the accuracy and efficiency of the laser damage threshold measurement of typical target materials such as aluminum alloys, titanium alloys and ceramics.

[0046] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A double-moving platform strong laser damage equivalent detection device for typical target materials, characterized in that: include: A laser (1) emits a laser beam toward a first beam splitter (2); A first beam splitter (2) splits the incident laser into two beams, one beam is incident on a light spot analyzer (3), and the other beam is incident on a second beam splitter (4); A second beam splitter (4) splits the incident laser into two beams, one beam is incident on the optical power meter / optical energy meter (5), and the other beam is incident on the damage equivalent detection device through the laser galvanometer (6); An optical power meter / optical energy meter (5) for measuring the power / energy of incident laser light; A spot analyzer (3) measures the spot size and beam quality of the incident laser; A damage equivalent detection device comprises a target material (7) for receiving laser light, a photosensitive photographic paper (8) for receiving the laser light after penetrating the target material (7) and generating an electrical signal through light exposure, and a light collector (9) for preventing laser light from overflowing; The computer (10) receives the electrical signal from the photosensitive paper (8) and controls the switching of the laser (1), records the time of laser irradiation of the target material (7), controls the switching of the spot analyzer (3) and the optical power meter / optical energy meter (5), and records the test data.

2. The double-moving platform high-intensity laser damage equivalent detection device for typical target materials as claimed in claim 1 is characterized in that: The target material (7) includes aluminum alloy, titanium alloy, and ceramics with a certain thickness.

3. The double-moving platform high-intensity laser damage equivalent detection device for typical target materials as claimed in claim 1 is characterized in that: The laser (1) comprises a continuous high-power laser or a pulse laser with high single pulse energy.

4. The double-moving platform high-intensity laser damage equivalent detection device for typical target materials as claimed in claim 1, characterized in that: The first beam splitter (2) and the second beam splitter (4) both comprise high-transmission-low-reflection type beam splitters with a known beam splitting ratio and a surface coating, and the beam splitting ratio is 99:

1.

5. The double-moving platform high-intensity laser damage equivalent detection device for typical target materials as claimed in claim 4 is characterized in that: The ratio of the laser intensity incident on the second beam splitter (4) to the laser intensity incident on the light spot analyzer (3) is 99:1; the ratio of the laser intensity incident on the damage equivalent detection device to the laser intensity of the optical power meter / optical energy meter (5) is 99:

1.

6. The double-moving platform high-intensity laser damage equivalent detection device for typical target materials as claimed in claim 1, characterized in that: When the laser (1) is a continuous laser, an optical power meter is used to measure the power of the incident laser; when the laser (1) is a pulsed laser, an optical energy meter is used to measure the energy of the incident laser.

7. A method for equivalent detection of damage to typical target materials based on strong laser, using the double-moving platform strong laser damage equivalent detection device for typical target materials as described in any one of claims 1 to 6, characterized in that: Turn on the laser (1); The spot size and beam quality of the incident laser are measured by a spot analyzer (3); the power / energy of the incident laser is measured by an optical power meter / optical energy meter (5); The laser galvanometer (6) is adjusted so that the laser irradiates the target material (7) in a preset manner; The computer (10) records the total time from when the laser (1) is turned on to when the laser penetrates the target material (7) and the photosensitive paper (8) starts to transmit electrical signals; Based on the power / energy of the incident laser, the light power / energy irradiated to the target is calculated through the beam splitting ratio of the second beam splitter (4), and the laser damage threshold of the target is calculated by combining the total time with the spot size and beam quality of the incident laser.

8. The equivalent detection method for damage to typical target materials based on a double-moving platform strong laser as claimed in claim 7 is characterized in that: The method for obtaining the preset mode includes: Obtain the motion characteristics, optical characteristics, and outer atmospheric turbulence and boundary layer of the laser emission end and the flying target; The equivalent amplitude and spot offset are calculated using theoretical models; The light spot offset is used as input and the moving speed of the flying target is used as a reference to simulate the laser irradiation of the flying target to achieve the simulation of the light spot scanning offset.

Images