A method, system and medium for characterizing the ability of protective materials to resist laser hard damage

Abstract

The present invention relates to a method, system and medium for characterizing the ability of a protective material to resist laser hard damage, comprising: photographing a surface image M of a protective material sample as a sample background; irradiating the surface of the protective material sample with a laser source n times; calibrating a spot area Sn irradiated on the surface of the protective material sample each time; photographing an image N of the position of the laser source irradiating the surface of the protective material sample each time; drawing the edge contour of a damaged part of the protective material sample after each laser source irradiation and calculating the damage area An according to the image M and the image N; solving an average value A / S of the ratio of the damage area An to the spot area Sn according to the calculated damage area An each time and the spot area Sn irradiated on the surface of the protective material sample each time by the laser source, and using the average value A / S to characterize the ability of the protective material to resist laser hard damage; the purpose is to reflect both the ability of the protective material to resist laser hard damage and the ability of the laser to strike a specific material.

Description

Technical Field

[0001] The present invention belongs to the field of laser technology, and in particular relates to a method, system and medium for characterizing the ability of protective materials to resist laser hard damage. Background Art

[0002] When laser protective materials are irradiated by strong laser, the strong laser interacts with the laser protective materials, causing thermal and mechanical damage to the laser protective materials, manifested as thermal ablation and layer cracking. Therefore, the laser hard damage resistance of protective materials is particularly critical to the development and selection of highly resistant laser damage protective materials.

[0003] Prior art 1: The document [Infrared laser hard damage to visible light imaging system [J]. High Power Laser and Particle Beams, 2010, 22(09): 2023-2026.] reported that when the irradiation level is constant, the smaller the aperture size, the less likely the optical system is to suffer hard damage. The aperture size reflects the energy entering the imaging system to a certain extent, but cannot reflect the material's ability to resist laser hard damage, nor can it reflect the laser's striking ability.

[0004] Prior art 2: Currently, the laser damage threshold method is the main method for evaluating laser hard damage ability. The patent with publication number CN202916206U discloses a device for measuring and evaluating the ability of thin films to resist laser damage. It uses a beam with uniform spatial energy distribution to induce film damage, and changes the relative distance between the focusing lens and the sample to be tested to adjust the light energy density irradiated on the sample to be tested. The device has a small measurement error, a high degree of automation, and is quick and easy to use. The laser damage threshold method evaluates the threshold for hard damage, which is based on the premise of zero damage probability and cannot reflect the laser's ability to strike materials or devices. Summary of the invention

[0005] The present invention mainly aims at the above problems and proposes a method, system and medium for characterizing the ability of protective materials to resist laser hard damage. Its purpose is to reflect both the ability of protective materials to resist laser hard damage and the ability of lasers to strike specific materials.

[0006] To achieve the above object, the present invention provides a method for characterizing the ability of a protective material to resist laser hard damage, comprising the following steps:

[0007] Step 1: Take a protective material sample surface image M as the sample background;

[0008] Step 2: irradiate the surface of the protective material sample n times using a laser source;

[0009] Step 3: calibrate the spot area Sn irradiated on the surface of the protective material sample each time;

[0010] Step 4: photographing an image N of the position on the surface of the protective material sample irradiated by the laser source each time;

[0011] Step 5: based on the image M and the image N, draw the edge contour of the damaged part of the protective material sample after each laser source irradiation and calculate the damaged area An;

[0012] Step 6: According to the damage area An calculated each time and the spot area Sn irradiated by the laser source on the surface of the protective material sample each time, solve the average value A / S of the ratio of the damage area An to the spot area Sn, and use the average value A / S to characterize the ability of the protective material to resist laser hard damage.

[0013] Furthermore, in step 2, the laser source is a continuous laser source, a pulsed laser source, or a combination of a continuous laser source and a pulsed laser source.

[0014] Furthermore, before step 2, the method further includes setting laser source irradiation parameters, wherein the laser source irradiation parameters include laser power, pulse energy, pulse frequency, and irradiation duration.

[0015] Furthermore, in step 2, the number of times n≥10 times the surface of the protective material sample is irradiated by the laser source, and a different position of the protective material sample is irradiated each time.

[0016] Furthermore, in step 3, the spot area Sn irradiated on the surface of the protective material sample each time is calibrated using four-wave shearing interferometry.

[0017] Furthermore, in step 5, the calculation method of the damage area An includes:

[0018] Subtracting the image M from the image N to obtain the edge contour of the damaged part of the protective material sample after each laser source irradiation;

[0019] The radiation damage area An is obtained by multiplying the number of pixels contained in the edge contour by the area of ​​a single pixel.

[0020] Furthermore, in step 1 and step 4, the image M and the image N are photographed by a CCD camera.

[0021] To achieve the above object, the present invention provides a system for characterizing the ability of protective materials to resist laser hard damage, the system comprising:

[0022] A laser control module, wherein the laser control module is used to control the direction of the laser beam so as to control and change the position of the laser spot incident on the surface of the protective material sample;

[0023] A laser generating module, the laser generating module comprising a laser source and a parameter control device, the laser source is used to generate a laser beam and incident the laser beam to the laser control module, the parameter control device is used to adjust the parameters of the laser beam generated by the laser source;

[0024] An acquisition module, the acquisition module is used to acquire an image M of the protective material sample before the test, an image N after the test, and a spot area Sn irradiated on the surface of the protective material sample each time;

[0025] The processing module is used to draw the edge contour of the damaged part of the protective material sample after each laser source irradiation according to the image M and the image N, and calculate the damage area An; based on the calculated damage area An each time and the spot area Sn on the surface of the protective material sample each time the laser source irradiates, solve the average value A / S of the ratio of the damage area An to the spot area Sn to obtain the test result for the protective material sample.

[0026] To achieve the above object, the present invention provides a system for characterizing the ability of protective materials to resist laser hard damage, the system comprising:

[0027] processor;

[0028] A memory stores a computer program that can be run on the processor, wherein when the computer program is executed by the processor, the method for characterizing the ability of a protective material to resist laser hard damage is implemented.

[0029] To achieve the above-mentioned purpose, the present invention provides a computer-readable storage medium, on which a data processing program is stored. When the data processing program is processed and executed, the method for characterizing the ability of a protective material to resist laser hard damage is implemented.

[0030] The above technical solution of the present invention has the following advantages: the method uses the average value A / S of the ratio of the surface damage area An of the protective material sample to the irradiated laser spot area Sn as the basis for evaluating the ability of the protective material to resist laser hard damage. Taking the irradiated spot area as a reference, the smaller the A / S, the stronger the ability of the protective material to resist laser hard damage. This characterization method can reflect both the ability of the protective material to resist laser hard damage and the ability of the laser to strike a specific material. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A flow chart of a method for characterizing the ability of a protective material to resist laser hard damage disclosed by the present invention;

[0032] Figure 2 This is a framework diagram of a system for characterizing the ability of protective materials to resist laser hard damage disclosed by the present invention.

[0033] In the figure: 10, laser control module; 20, laser generation module; 30, acquisition module; 40, processing module. DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In one aspect of the present invention, a method for characterizing the ability of a protective material to resist laser hard damage is provided, and this characterization method can reflect both the ability of the protective material to resist laser hard damage and the ability of the laser to strike a specific material.

[0038] The above method for characterizing the ability of protective materials to resist laser hard damage may include, but is not limited to, the following steps.

[0039] Step 1: Select a strong laser source for testing; the strong laser source may be selected from, but is not limited to, a continuous laser source, a pulsed laser source, or a continuous and pulsed combined laser source;

[0040] Step 2: setting the irradiation parameters of the strong laser source; the irradiation parameters of the strong laser source include laser power, pulse energy, pulse frequency, irradiation time, etc. During the test, n measurements are performed under the same setting parameters.

[0041] Step 3: Observe and photograph the surface of the protective material sample using a microscope with an integrated CCD camera to obtain an image M as the sample background, specifically:

[0042] Before shooting, adjust the focal length, aperture size, light source intensity, etc. of the microscope, adjust the exposure intensity, exposure time, gain and other parameters of the CCD camera. In order to eliminate the error of the protective material sample image taken due to parameter changes, fix the microscope parameters and CCD camera parameters during the subsequent entire shooting process.

[0043] Step 4: irradiate the surface of the protective material sample n (n≥10) times using a strong laser source, irradiating a different position of the protective material sample each time;

[0044] Step 5: Use the four-wave shearing interferometry method in the prior art with patent number CN202110625100.3 to calibrate the spot area Sn irradiated on the surface of the protective material sample each time.

[0045] Step 6: Use a CCD camera to capture an image N of the laser irradiation position on the surface of the protective material sample each time;

[0046] Step seven, subtract image M from image N, draw the edge contour of the damaged part of the protective material sample after each laser irradiation and calculate the damage area An. Specifically, subtract image M from image N to obtain the edge contour of the damaged part of the protective material sample after each laser irradiation, multiply the number of pixels contained in the edge contour by the area of ​​a single pixel to obtain the irradiation damage area An.

[0047] Step 8. Calculate the average value A / S of An / Sn of the protective material sample irradiated by laser n times, and the ability of the protective material to resist laser hard damage is characterized by A / S.

[0048] It should also be understood that the above-mentioned embodiments of the method for characterizing the ability of protective materials to resist laser hard damage can be performed in a systematic manner, for example:

[0049] A system for characterizing the ability of protective materials to resist laser hard damage, the system comprising:

[0050] A laser control module 10, which is used to control the direction of the laser beam to control and change the position of the laser spot incident on the surface of the protective material sample;

[0051] A laser generating module 20, the laser generating module comprising a laser source and a parameter control device, the laser source is used to generate a laser beam and incident the laser beam to the laser control module, the parameter control device is used to adjust the parameters of the laser beam generated by the laser source;

[0052] An acquisition module 30, which is used to acquire an image M of the protective material sample before the test, an image N after the test, and a spot area Sn irradiated on the surface of the protective material sample each time;

[0053] The processing module 40 is used to draw the edge contour of the damaged part of the protective material sample after each laser source irradiation according to the image M and the image N, and calculate the damage area An; based on the calculated damage area An each time and the spot area Sn on the surface of the protective material sample each time the laser source irradiates, solve the average value A / S of the ratio of the damage area An to the spot area Sn to obtain the test result for the protective material sample.

[0054] If the system of the above characterization method is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention can implement all or part of the process in the characterization of the laser hard damage resistance of a protective material described in the above embodiment, and can also be completed by pointing to the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, the steps of the above method embodiment can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media does not include electrical carrier signals and telecommunication signals.

[0055] In the specification and claims of the present application, the words "include / comprise" and the words "have / include" and their variations are used to specify the existence of stated features, values, steps or components, but do not exclude the existence or addition of one or more other features, values, steps, components or combinations thereof.

[0056] Some features of the present invention are described in different embodiments for clarity of description, however, these features may also be described in combination in a single embodiment. Conversely, some features of the present invention are described in only a single embodiment for brevity, however, these features may also be described in different embodiments alone or in any suitable combination.

[0057] It should be noted that, under the premise of no conflict, the various embodiments and / or technical features in the various embodiments described in this application can be arbitrarily combined with each other, and the technical solutions obtained after the combination should also fall within the protection scope of this application. It should be understood that in the various embodiments of this application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for characterizing the ability of protective materials to resist laser hard damage, characterized in that: The following steps are involved: Step 1: Take a surface image M of the protective material sample as the sample background; Step 2: irradiate the surface of the protective material sample n times using a laser source; Step 3: calibrating the spot area Sn irradiated on the surface of the protective material sample each time: using the four-wave shearing interferometry method to calibrate the spot area Sn irradiated on the surface of the protective material sample each time; Step 4: photographing an image N of the position on the surface of the protective material sample irradiated by the laser source each time; Step 5: Based on the image M and the image N, draw the edge contour of the damaged part of the protective material sample after each laser source irradiation and calculate the damage area An: subtract the image M from the image N to obtain the edge contour of the damaged part of the protective material sample after each laser source irradiation; multiply the number of pixels contained in the edge contour by the area of ​​a single pixel to obtain the irradiation damage area An; Step 6: According to the damage area An calculated each time and the spot area Sn irradiated by the laser source on the surface of the protective material sample each time, solve the average value A / S of the ratio of the damage area An to the spot area Sn, and use the average value A / S to characterize the ability of the protective material to resist laser hard damage.

2. A method for characterizing the ability of protective materials to resist laser hard damage as claimed in claim 1, characterized in that: In step 2, the laser source is a continuous laser source, a pulsed laser source, or a combination of a continuous laser source and a pulsed laser source.

3. A method for characterizing the ability of protective materials to resist laser hard damage as claimed in claim 1, characterized in that: Before step 2, the method further includes setting laser source irradiation parameters, wherein the laser source irradiation parameters include laser power, pulse energy, pulse frequency, and irradiation duration.

4. A method for characterizing the ability of protective materials to resist laser hard damage as claimed in claim 1, characterized in that: In step 2, the number of times n≥10 times the surface of the protective material sample is irradiated by a laser source, and a different position of the protective material sample is irradiated each time.

5. A method for characterizing the ability of protective materials to resist laser hard damage as claimed in claim 1, characterized in that: In step 1 and step 4, the image M and the image N are photographed by a CCD camera.

6. A system for characterizing the ability of protective materials to resist laser hard damage, characterized in that: The system is used to implement the method for characterizing the ability of a protective material to resist laser hard damage as described in any one of claims 1 to 5, and comprises: A laser control module, wherein the laser control module is used to control the direction of the laser beam so as to control and change the position of the laser spot incident on the surface of the protective material sample; A laser generating module, the laser generating module comprising a laser source and a parameter control device, the laser source is used to generate a laser beam and incident the laser beam to the laser control module, the parameter control device is used to adjust the parameters of the laser beam generated by the laser source; An acquisition module, the acquisition module is used to acquire an image M of the protective material sample before the test, an image N after the test, and a spot area Sn irradiated on the surface of the protective material sample each time; The processing module is used to draw the edge contour of the damaged part of the protective material sample after each laser source irradiation according to the image M and the image N, and calculate the damage area An; based on the calculated damage area An each time and the spot area Sn on the surface of the protective material sample each time the laser source irradiates, solve the average value A / S of the ratio of the damage area An to the spot area Sn to obtain the test result for the protective material sample.

7. A system for characterizing the ability of protective materials to resist laser hard damage, characterized in that: The system comprises: processor; A memory storing a computer program executable on the processor, wherein when the computer program is executed by the processor, a method for characterizing the ability of a protective material to resist laser hard damage as described in any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a data processing program, and when the data processing program is processed and executed, a method for characterizing the ability of a protective material to resist laser hard damage as described in any one of claims 1 to 5 is implemented.

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