Speckle pattern manufacturing device for digital image related technology

Abstract

The utility model provides a speckle pattern manufacturing device for a digital image related technology. The speckle pattern manufacturing device comprises a printing module, a columnar mold, an ink supply module and a positioning frame. The printing module wraps the columnar mold, the printing module is connected with the ink supply module, the columnar mold is connected with the positioning frame through a rotating bearing, the printing module is made of an elastic porous material, and the elastic porous material is composed of an elastic porous material substrate and elastic porous material protruding points. And the heights of the elastic porous material salient points protruding out of the elastic porous material substrate are consistent.

Description

Technical Field

[0001] The utility model relates to the technical field of digital image correlation methods, in particular to a speckle pattern making device used in digital image correlation technology. Background Art

[0002] Digital Image Correlation (DIC) is a non-contact optical measurement technology that measures the surface deformation of an object by analyzing pixel changes in a series of images. DIC technology has the advantages of simple optical path, good environmental adaptability, wide measurement range and high degree of automation. It is widely used in civil engineering, mechanical engineering, materials science, electronic packaging, biomedicine and manufacturing industries. In particular, in the study of mechanical properties of materials, DIC technology has been increasingly used due to its high precision and high resolution.

[0003] DIC technology relies on speckle images on the sample surface to calculate deformation, so the quality of the speckle directly affects the measurement accuracy. An ideal speckle image should have high contrast and evenly distributed speckles, which can ensure that the speckle can be accurately tracked and identified during the deformation process. However, the production of speckles is often a difficulty in DIC applications. The production methods and quality vary, which directly affects the reliability and accuracy of DIC measurements. Currently, common speckle production methods include marker pen marking, manual spray painting, sticker transfer, and tool stamping:

[0004] 1. Marker pen marking method: The speckle pattern is manually drawn on the sample surface with a marker pen. This method is flexible and requires low equipment, but the manual drawing of speckle patterns is a huge workload, especially for the testing of large quantities of samples, which is time-consuming and labor-intensive. Manual drawing is also difficult to ensure the uniformity and density of the speckle pattern, and the problem of unstable speckle pattern quality is prominent.

[0005] 2. Manual painting method: Spraying paint on the sample surface to generate speckle patterns is a highly efficient method, but it is extremely dependent on operator experience. Even if the operator is experienced, it is difficult to avoid uneven spraying during the spraying process, which leads to inconsistent speckle pattern quality and affects the standardization of DIC measurement. What is more serious is that excessive spraying of paint may cause the sample to be scrapped, and the operation risk is relatively high.

[0006] 3. Sticker transfer method: This method is simple and easy to use by sticking the pre-printed speckle pattern on the sample surface. However, due to the adhesion between the sticker and the sample surface, the sticker deformation may not fully reflect the actual deformation of the sample, affecting the accuracy of DIC analysis. At the same time, the adhesive coating used for stickers generally has a reflective problem, and the measurement data of the reflective area will be completely lost.

[0007] 4. Tool stamping method: By stamping the sample surface with a pre-made speckle pattern, this method is simple and easy to use, but it is only applicable to flat samples and cannot be used for curved samples and samples with uneven surfaces. At the same time, this method is limited by the fixed stamp pattern, and the randomness of the speckle is difficult to guarantee. The block-by-block speckle making method also limits the speckle making efficiency to a certain extent. Utility Model Content

[0008] In order to partially solve the problems of low speckle production efficiency, uneven speckle quality, poor pattern randomness and limited applicable scenarios in the existing DIC measurement area speckle pattern production tools and methods, the utility model proposes a speckle pattern production device for digital image correlation technology, and the specific technical solution is as follows:

[0009] A speckle pattern making device for digital image correlation technology comprises a printing module, a columnar mold, an ink supply module and a positioning frame. The printing module is wrapped around the columnar mold, the printing module is connected to the ink supply module, the columnar mold is connected to the positioning frame via a rotating bearing, the printing module is an elastic porous material, the elastic porous material is composed of an elastic porous material base and elastic porous material convex points, and the elastic porous material convex points protrude from the elastic porous material base to a consistent height.

[0010] Preferably, the ink supply module consists of an ink storage inner cylinder and an elastic porous ink pad, and the elastic porous ink pad is wrapped around the ink storage inner cylinder.

[0011] Preferably, the wall of the ink storage inner cylinder is provided with a plurality of ink outlet holes.

[0012] Preferably, the ink supply module is connected to the fixing module through an ink storage inner cylinder acting as a rotating bearing.

[0013] Preferably, the elastic porous material protrusions are in contact with the elastic porous ink pad.

[0014] Preferably, the positioning frame consists of a fixing module and a holding module.

[0015] Preferably, the columnar mold and the ink storage inner cylinder are fixed in place by the fixing module.

[0016] Preferably, the elastic porous material is a high-density sponge.

[0017] Preferably, the elastic porous ink pad material is a low-density sponge.

[0018] Preferably, the ink supply module may be formed by the elastic porous material substrate.

[0019] The utility model also provides a method for producing a speckle pattern, the method adopts the speckle pattern producing device, and the method comprises the following steps:

[0020] Step A: carving elastic porous material convex points on an elastic porous material substrate to form a printing module;

[0021] Step B: wrapping the printing module in a cylindrical mold to assemble into a cylindrical printing module;

[0022] Step C: installing the columnar printing module and the ink supply module on a positioning frame to assemble into a speckle pattern making device;

[0023] Step D: adding ink into the ink supply module until the elastic porous ink pad is completely soaked with ink;

[0024] Step E: Apply a single-color primer on the surface of the test area, and keep the sample still until the single-color primer is dry and solidified;

[0025] Step F: rolling a speckle pattern on the single-color base coating by using the speckle pattern making device.

[0026] Preferably, the density of the protrusions of the elastic porous material in step A is lower than the preset speckle density, so as to ensure that the speckle pattern is highly random by rolling the measuring area multiple times.

[0027] Preferably, the ink in step D is a quick-drying matte ink.

[0028] Preferably, the color of the monochrome primer in step E has a high contrast with the color of the matte ink in step D.

[0029] Preferably, the single-color primer in step E is a matte primer.

[0030] Preferably, the operation of rolling the speckle pattern in step F needs to be performed multiple times to ensure that a speckle pattern with moderate density, uniform distribution and regular randomness is obtained.

[0031] Compared with the prior art, the utility model has the following advantages:

[0032] 1. The efficiency of speckle production is greatly improved. The speckle pattern printing module of the utility model is a rollable cylinder. The efficiency of rolling speckle pattern printing is much higher than the efficiency of printing speckle pattern by block and partition through stamp. The measured results show that when producing speckle patterns of the same area, the time required for rolling speckle pattern printing is only about 1 / 30 of the time required for stamp. At the same time, the utility model has its own ink supply module, and there is no need to replenish ink through an external ink pad during use, which further improves the efficiency of speckle pattern printing.

[0033] 2. The scope of application is significantly expanded. The speckle pattern printing module of the utility model is a rollable cylinder, which is applicable to both plane and cylindrical samples. The speckle pattern printing module is a convex point of elastic porous material. The strong deformation ability of the material enables it to adapt to the uneven surface of the measurement area. The scope of application is significantly expanded compared with the existing speckle pattern production tools.

[0034] 3. The overall cost is relatively low. The materials used in the present invention are all common materials, and do not involve complicated and expensive processing techniques. The overall cost is relatively low compared to existing speckle pattern production tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is an axonometric diagram of a speckle pattern making device in an embodiment of the utility model;

[0036] Figure 2 This is an axonometric diagram of a printing module in an embodiment of the utility model;

[0037] Figure 3 It is an axonometric view of a cylindrical mold in an embodiment of the utility model;

[0038] Figure 4 This is an axonometric diagram of the ink supply module in the embodiment of the utility model;

[0039] Figure 5 It is an axonometric diagram of the positioning frame in the embodiment of the utility model;

[0040] Figure 6 This is a schematic diagram of the operation of making speckles on a cylindrical surface in an embodiment of the utility model;

[0041] Figure 7 is a speckle pattern in an embodiment of the present utility model;

[0042] Reference numerals:

[0043] 1. Printing module; 11. Elastic porous material substrate; 12. Elastic porous material protrusions; 2. Columnar module; 21. Rotating bearing; 3. Ink supply module; 31. Ink storage inner cylinder; 32. Elastic porous ink pad; 4. Positioning frame; 41. Fixing module; 42. Holding module; 5. Ink storage inner cylinder cover; 6. Cylindrical sample. DETAILED DESCRIPTION

[0044] In order to make the purpose and advantages of the utility model more concise and clear, the utility model will be explained with the following specific embodiments, but the utility model is by no means limited to these embodiments. The following embodiments are only preferred embodiments of the utility model and are only used to illustrate the utility model and cannot be understood as limiting the scope of the utility model. It should be pointed out that any modifications, equivalent substitutions and improvements made within the essence and principles of the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

[0045] Example

[0046] A speckle pattern making device for digital image correlation technology comprises a printing module 1, a columnar mold 2, an ink supply module 3 and a positioning frame 4. The printing module 1 is wrapped around the columnar mold 2, the printing module 1 is connected to the ink supply module 3, the columnar mold 2 is connected to the positioning frame 4 through a rotating bearing 21, the printing module 1 is an elastic porous material, the elastic porous material is composed of an elastic porous material base 11 and elastic porous material convex points 12, and the elastic porous material convex points 12 protrude from the elastic porous material base 11 to a consistent height.

[0047] Preferably, the ink supply module 3 is composed of an ink storage inner cylinder 31 and an elastic porous ink pad 32 , and the elastic porous ink pad 32 is wrapped around the ink storage inner cylinder 31 .

[0048] Preferably, the wall of the ink storage inner cylinder 31 is provided with a plurality of ink outlet holes.

[0049] Preferably, the ink supply module 3 is connected to the fixing module 41 through the ink storage inner cylinder 31 acting as a rotating bearing.

[0050] Preferably, the elastic porous material protrusions 12 are in contact with the elastic porous ink pad 32 .

[0051] Preferably, the positioning frame 4 consists of a fixing module 41 and a holding module 42 .

[0052] Preferably, the columnar mold 2 and the ink storage inner cylinder 31 are fixed in place by the fixing module 41 .

[0053] Preferably, the elastic porous material is a high-density sponge.

[0054] Preferably, the elastic porous ink pad material is a low-density sponge.

[0055] Preferably, the ink supply module 3 can be made of the elastic porous material substrate 11 .

[0056] The utility model also provides a method for producing a speckle pattern, the method adopts the speckle pattern producing device, and the method comprises the following steps:

[0057] Step A: carving elastic porous material convex points on an elastic porous material substrate to form a printing module;

[0058] Step B: wrapping the printing module in a cylindrical mold to assemble into a cylindrical printing module;

[0059] Step C: installing the columnar printing module and the ink supply module on a positioning frame to assemble into a speckle pattern making device;

[0060] Step D: adding ink into the ink supply module until the elastic porous ink pad is completely soaked with ink;

[0061] Step E: Apply a single-color primer on the surface of the test area, and keep the sample still until the single-color primer is dry and solidified;

[0062] Step F: rolling a speckle pattern on the single-color base coating by using the speckle pattern making device.

[0063] Preferably, the density of the protrusions of the elastic porous material in step A is lower than the preset speckle density, so as to ensure that the speckle pattern is highly random by rolling the measuring area multiple times.

[0064] Preferably, the ink in step D is a quick-drying matte ink.

[0065] Preferably, the color of the monochrome primer in step E has a high contrast with the color of the matte ink in step D.

[0066] Preferably, the single-color primer in step E is a matte primer.

[0067] Preferably, the operation of rolling the speckle pattern in step F needs to be performed multiple times to ensure that a speckle pattern with moderate density, uniform distribution and regular randomness is obtained.

[0068] The above description is only a specific implementation mode of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions 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 should be based on the protection scope of the claims. According to the disclosure and teaching of the above specification, technicians in the technical field to which the present utility model belongs can also change and modify the above implementation mode. Therefore, the protection scope is not limited to the specific implementation modes disclosed and described above, and some modifications and changes to the claims should also fall within the protection scope of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the present utility model.

Claims

1. A speckle pattern production device for digital image correlation technology, characterized in that: It includes a printing module, a columnar mold, an ink supply module and a positioning frame; The printing module is wrapped around the columnar mold, the printing module is connected to the ink supply module, and the columnar mold is connected to the positioning frame via a rotating bearing; The printing module is an elastic porous material, which is composed of an elastic porous material base and elastic porous material convex points, and the elastic porous material convex points protrude from the elastic porous material base at the same height.

2. The speckle pattern making device according to claim 1, characterized in that: The ink supply module is composed of an ink storage inner cylinder and an elastic porous ink pad; the elastic porous ink pad is wrapped around the ink storage inner cylinder, and a plurality of ink outlet holes are opened on the wall of the ink storage inner cylinder.

3. The speckle pattern making device according to claim 2, characterized in that: The positioning frame is composed of a fixing module and a holding module, and the columnar mold and the ink storage inner cylinder are fixed and positioned by the fixing module.

4. The speckle pattern making device according to claim 2, characterized in that: The elastic porous material substrate and the elastic porous material convex points are high-density sponges, and the elastic porous ink pad is a low-density sponge.

5. The speckle pattern making device according to claim 2, characterized in that: The elastic porous material protrusions are in contact with the elastic porous ink pad.

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