Portable and multipurpose monocular digital image full-field deformation measuring device

Abstract

The utility model relates to a portable and multipurpose monocular digital image full-field deformation measuring device which comprises a shell, lighting sources, a digital image measuring system, a computer and an integrated board, a plurality of lighting sources are arranged on the front side of the shell, and the digital image measuring system and the integrated board are respectively arranged inside the shell. The integrated board is electrically connected with the illumination light source and the digital image measurement system; the digital image measuring system comprises a stepping motor, a sliding table module, an adapter plate, a camera and a prime lens, the sliding table module is arranged at the bottom in the shell, the stepping motor is arranged on one side of the sliding table module and drives a sliding table on the sliding table module to reciprocate, the adapter plate is arranged at the top of the sliding table, the camera is arranged at the top of the adapter plate, and the prime lens is arranged on the front side of the camera. A strip-shaped through hole is formed in the front side of the shell, and the prime lens penetrates out of the through hole and moves in the through hole. According to the utility model, camera movement control, light adjustment, signal transmission and the like are integrated, the structure is compact, the versatility is strong, and the carrying is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of structure monitoring, in particular to a portable, multi-purpose monocular digital image full-field deformation measuring device. Background Art

[0002] Digital image correlation (DIC) is a non-contact optical measurement technology for measuring the displacement field and strain field of the specimen surface. It is also a method closely related to engineering practice. Digital image correlation has relatively low environmental requirements and good robustness. Digital image correlation calculates the displacement vector of each pixel point by comparing the different states of the surface of the measured target before and after deformation, and completes the two-dimensional deformation field measurement. Further, by collecting images of the measured target at two different angles, the spatial position coordinates of the feature points or pixel points of the specimen before and after deformation are calculated using a three-dimensional imaging model, thereby obtaining the displacement of each feature point or pixel point, and completing the three-dimensional deformation field measurement of the measured target.

[0003] In actual measurement, users often need two sets of measurement devices to meet different two-dimensional or three-dimensional measurement requirements, which is costly and inconvenient to carry. At the same time, when performing 3D-DIC measurement, users often need to adjust the spacing and angle of the camera, which is time-consuming and laborious. Summary of the invention

[0004] The utility model aims to solve the deficiencies of the prior art and provides a portable, multi-purpose monocular digital image full-field deformation measuring device.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a portable, multi-purpose monocular digital image full-field deformation measurement device, comprising a housing, an illumination light source, a digital image measurement system, a computer, and an integrated board, wherein a plurality of illumination light sources are arranged on the front side of the housing, the digital image measurement system and the integrated board are arranged inside the housing respectively, and the integrated board is electrically connected to the illumination light source and the digital image measurement system;

[0006] The digital image measurement system includes a stepper motor, a slide module, an adapter plate, a camera, and a fixed-focus lens. The slide module is arranged at the bottom of the housing, the stepper motor is arranged at one side of the slide module and drives the slide on the slide module to move back and forth, the adapter plate is arranged at the top of the slide, the camera is arranged at the top of the adapter plate, the fixed-focus lens is arranged at the front side of the camera, and a strip-shaped through hole is arranged at the front side of the housing, and the fixed-focus lens passes through the through hole and moves in the through hole;

[0007] The integrated board includes a lighting control module, a high-voltage module, and a computer communication module. The high-voltage module includes a DC power supply, a closed-loop stepper driver, and a controller. The lighting source, the stepper motor, the camera, the lighting control module, the computer communication module, the closed-loop stepper driver, and the controller are electrically connected to the DC power supply respectively. The lighting source is electrically connected to the lighting control module. The closed-loop stepper driver is electrically connected to the stepper motor. The closed-loop stepper driver, the stepper motor, the camera, and the lighting control module are electrically connected to the controller respectively. The camera, the controller, and the computer are connected via the computer communication module.

[0008] Particularly, the housing is composed of a front cover plate, a rear cover plate and an upper cover plate, the front cover plate is in a lying U shape, the rear cover plate is in an L shape, the upper cover plate is in a rectangular shape, and the front cover plate, the rear cover plate and the upper cover plate are connected and fixed by bolts.

[0009] In particular, a through hole is arranged on the front side wall of the front cover plate, and lighting source mounting holes are respectively arranged at both ends of the front side wall of the front cover plate. The lighting source mounting holes are located below the through hole, and the lighting source is installed in the lighting source mounting holes and fixed to the outside of the front side wall of the front cover plate by bolts.

[0010] Particularly, an external power supply interface and an external communication interface are respectively provided at one end of the rear side wall of the rear cover plate, the DC power supply is connected to the external power supply through the external power supply interface, and the computer communication module is connected to the computer through the external communication interface.

[0011] Particularly, the DC power supply, the closed-loop stepping driver, the controller, the computer communication module, and the slide module are respectively mounted on the top of the bottom wall of the rear cover plate, and the lighting control module is fixed inside the front side wall of the front cover plate by bolts.

[0012] Particularly, buffer pads are provided on the inner walls of both ends of the guide rails on the slide module.

[0013] The beneficial effects of the utility model are as follows: the utility model integrates camera movement control, light adjustment, signal transmission, etc. into one by arranging a shell, an illumination light source, a digital image measurement system, a computer, and an integrated board; the utility model has a compact structure and strong versatility; under the premise of ensuring accuracy, the space is compressed to the maximum extent possible, and the device is convenient to carry; and the device can perform two-dimensional deformation field measurement or three-dimensional deformation field measurement of the sample as required, and is flexible and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the digital image measurement system of the utility model;

[0016] Figure 3 This is a schematic diagram of the integrated board structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the connection between the camera and the fixed-focus lens of the utility model;

[0018] Figure 5 This is a schematic diagram of the locations of the external power supply interface and the external communication interface of the utility model;

[0019] Figure 6 This is a schematic diagram of the shell structure of the utility model;

[0020] In the figure: 1-housing; 101-through hole; 102-front cover; 103-rear cover; 104-upper cover; 105-illumination light source mounting hole; 106-external power supply interface; 107-external communication interface;

[0021] 2- Lighting source;

[0022] 3-digital image measurement system; 301-stepping motor; 302-slide module; 303-adapter plate; 304-camera; 305-fixed focus lens;

[0023] 4-integrated board; 401-lighting control module; 402-power module; 4021-DC power supply; 4022-closed loop stepper driver; 4023-controller; 403-computer communication module;

[0024] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0025] Compared with the existing digital image measuring device that separates the measurement of two-dimensional deformation field and three-dimensional deformation field, the utility model includes a set of 2D-DIC measurement system with a fixed field of view and a set of 3D-DIC measurement system with a fixed field of view. The device can adjust the test system or the position of the target to be measured according to the actual measurement requirements, so that the surface of the target to be measured is within the effective measurement area of ​​the field of view suitable for the 2D-DIC or 3D-DIC subsystem, and then accurately control the movement of the camera 304 to collect images in sequence at the specified position to complete the two-dimensional or three-dimensional deformation field measurement of the target to be measured. The utility model has a compact structure, strong versatility, is convenient and quick to use, and is easy to carry.

[0026] Under the premise that the resolution of the camera 304 is determined, the utility model can successively select different measurement modes to measure the target to be measured, and collect images of the target area through different camera 304 movement modes, without changing the equipment midway, to obtain the two-dimensional deformation field or three-dimensional deformation field measurement data of the target to be measured.

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0028] like Figure 1-Figure 6As shown, a portable, multi-purpose monocular digital image full-field deformation measuring device includes a shell 1, an illumination light source 2, a digital image measuring system 3, a computer, and an integrated board 4. A plurality of illumination light sources 2 are arranged at the front side of the shell 1, the digital image measuring system 2 and the integrated board 4 are respectively arranged inside the shell 1, and the integrated board 4 is electrically connected to the illumination light source 2 and the digital image measuring system 3; the shell 1 is composed of a front cover plate 102, a rear cover plate 103, and an upper cover plate 104. The front cover plate 102 is in a lying U-shape, the rear cover plate 103 is in an L-shape, and the upper cover plate 104 is in a rectangular shape. The front cover plate 102, the rear cover plate 103, and the upper cover plate 104 are connected and fixed by bolts. The front cover plate 102, the rear cover plate 103, and the upper cover plate 104 are convenient to disassemble and assemble, so as to facilitate the maintenance of internal components.

[0029] The digital image measurement system 3 includes a stepper motor 301, a slide module 302, an adapter plate 303, a camera 304, and a fixed-focus lens 305. The slide module 302 is arranged at the bottom of the housing 1. The stepper motor 301 is arranged on one side of the slide module 301 and drives the slide on the slide module 302 to move back and forth. Buffer pads are arranged on the inner walls of both ends of the guide rail on the slide module 302. The adapter plate 303 is arranged on the top of the slide. The camera 304 is arranged on the top of the adapter plate 303. The fixed-focus lens 305 05 is arranged on the front side of the camera 304, a strip-shaped through hole 101 is arranged on the front side of the housing 1, and the fixed-focus lens 305 passes through the through hole 101 and moves in the through hole 101; the through hole 101 is arranged on the front side wall of the front cover plate 102, and both ends of the front side wall of the front cover plate 102 are respectively provided with lighting source mounting holes 105, the lighting source mounting holes 105 are located below the through hole 101, and the lighting source 2 is installed in the lighting source mounting hole 105 and fixed to the outside of the front side wall of the front cover plate 102 by bolts;

[0030] The integrated board 4 includes a lighting control module 401, a strong current module 402, and a computer communication module 403. The strong current module 402 includes a DC power supply 4021, a closed-loop stepping driver 4022, and a controller 4023. The lighting source 2, the stepping motor 301, the camera 304, the lighting control module 401, the computer communication module 403, the closed-loop stepping driver 4022, and the controller 4023 are electrically connected to the DC power supply 4021, and are powered by the DC power supply 4021. The lighting source 2 is electrically connected to the lighting control module 401, and the closed-loop stepping driver 4022 is electrically connected to the stepping motor 301. The closed-loop stepper driver 4022, the stepper motor 301, the camera 304, and the light control module 401 are electrically connected to the controller 4023 respectively, and the camera 304, the controller 4023 and the computer are connected via the computer communication module 403; the digital image information collected by the camera 304 is transmitted to the computer via the computer communication module 403; wherein, the DC power supply 4021 can adopt the SE-450 power supply, the closed-loop stepper driver 4022 can adopt the LCDA357H three-phase closed-loop stepper driver, and the controller 4023 can adopt the LCDA86H two-phase closed-loop stepper driver.

[0031] An external power supply interface 106 and an external communication interface 107 are respectively provided at one end of the rear side wall of the rear cover plate 103. The DC power supply 4021 is connected to the external power supply through the external power supply interface 106, and the computer communication module 403 is connected to the computer through the external communication interface 107; the DC power supply 4021, the closed-loop stepper driver 4022, the controller 4023, the computer communication module 403, and the slide module 302 are respectively installed on the top of the bottom wall of the rear cover plate 103, and the lighting control module 401 is fixed to the inside of the front side wall of the front cover plate 102 by bolts.

[0032] The illumination light source 2 adjusts the brightness through the lighting control module 401, and is used to actively illuminate the surface of the test sample. The camera 304 is used to photograph the test target with texture or artificial speckle on the surface, and transmits the digital image of the test sample surface before and after deformation to the computer. The 2D-DIC and 3D-DIC digital image correlation measurement systems use different measurement methods and obtain different results. When the system is used for measuring a two-dimensional deformation field, the position of the camera 304 is fixed, and the images of the test target before and after deformation are collected. When used for measuring a three-dimensional deformation field, it is necessary to move the position of the camera 304 through the slide mold 302, and collect the images of the target before deformation at both ends of the slide rail. After the test target is deformed, the above process is repeated to achieve the measurement of the deformation field through the principle of binocular vision.

[0033] Camera movement control software and digital image correlation measurement and analysis software are installed in the computer. According to the selected measurement mode (two-dimensional or three-dimensional), the above software is used to control the movement of the camera 403 through the slide module 302 and analyze and process the images collected by the camera 403, and generate displacement diagrams and strain diagrams.

[0034] Specifically, the two-dimensional or three-dimensional measurement system shares the same measurement unit, and the camera movement control software in the computer controls the slide module 302 to control the movement of the measurement unit to obtain the surface image of the target being measured collected by the camera 403 at the specified position; the slide module 302 in the measurement system adopts a separate motor configuration, that is, the lead screw in the slide module 302 is connected to the main shaft of the stepper motor 301 through a coupling, and the coupling can be directly replaced after wear, and a buffer pad is set inside the end of the guide rail to accurately control the stroke of the measurement unit.

[0035] When the utility model works, it includes the following steps:

[0036] 1. Install the measuring device on a tripod, connect it to a computer and turn on the power supply. Adjust the image acquisition frequency and the brightness of the illumination source 2 according to the actual situation so that the image grayscale is within an appropriate range.

[0037] 2. Determine the selected field of view: adjust the position of the measuring device or the target to be measured according to the area size and working distance of the target to be measured, until the speckles sprayed on the surface of the target to be measured are clearly visible in the field of view of the camera 403;

[0038] 3. Calibrate the camera 403 in the measurement unit, collect multiple images, and determine external parameters such as the position of the camera 403 and internal parameters such as the position of the lens optical center, so as to facilitate subsequent calculations;

[0039] 4. Start measuring. When the 2D-DIC measurement mode is selected, there is no need to move the position of the measuring unit. It is always in the center of the slide rail in the slide module 302 before and after the measured target is deformed. When the 3D-DIC measurement mode is selected, the position of the measuring unit needs to be moved by the computer camera movement control software, and the image of the target before deformation is collected at both ends of the slide rail. After the measured target is deformed, the measuring unit is moved to both ends of the slide rail again to collect the image after deformation. If multiple deformation measurements are required, the above process is repeated.

[0040] 5. The image data collected by the digital image correlation measurement system is transmitted to the computer, and the two-dimensional deformation field or three-dimensional deformation field of the measured target is calculated by the digital image correlation measurement analysis software.

[0041] 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.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The utility model is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the utility model is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the utility model, or are directly applied to other occasions without improvement, they are all within the protection scope of the utility model.

Claims

1. A portable, multi-purpose monocular digital image full-field deformation measurement device, characterized in that: The device comprises a housing (1), an illumination light source (2), a digital image measurement system (3), a computer, and an integrated board (4); a plurality of illumination light sources (2) are arranged on the front side of the housing (1); the digital image measurement system (3) and the integrated board (4) are arranged inside the housing (1), respectively; and the integrated board (4) is electrically connected to the illumination light source (2) and the digital image measurement system (3); The digital image measurement system (3) comprises a stepper motor (301), a slide module (302), an adapter plate (303), a camera (304), and a fixed-focus lens (305); the slide module (302) is arranged at the bottom of the housing (1); the stepper motor (301) is arranged at one side of the slide module (302) and drives the slide on the slide module (302) to move back and forth; the adapter plate (303) is arranged at the top of the slide; the camera (304) is arranged at the top of the adapter plate (303); the fixed-focus lens (305) is arranged at the front side of the camera (304); a strip-shaped through hole (101) is arranged at the front side of the housing (1); and the fixed-focus lens (305) passes through the through hole (101) and moves in the through hole (101); The integrated board (4) comprises a lighting control module (401), a strong current module (402), and a computer communication module (403); the strong current module (402) comprises a direct current power supply (4021), a closed-loop stepping driver (4022), and a controller (4023); the lighting light source (2), the stepping motor (301), the camera (304), the lighting control module (401), the computer communication module (403), the closed-loop stepping driver (4022), and the controller (4023) are respectively electrically connected to the direct current power supply (4021); the lighting light source (2) is electrically connected to the lighting control module (401); the closed-loop stepping driver (4022) is electrically connected to the stepping motor (301); the closed-loop stepping driver (4022), the stepping motor (301), the camera (304), and the lighting control module (401) are respectively electrically connected to the controller (4023); and the camera (304), the controller (4023), and the computer are connected via the computer communication module (403).

2. A portable, multi-purpose monocular digital image full-field deformation measurement device according to claim 1, characterized in that: The housing (1) is composed of a front cover plate (102), a rear cover plate (103), and an upper cover plate (104); the front cover plate (102) is in a lying U-shape, the rear cover plate (103) is in an L-shape, and the upper cover plate (104) is in a rectangular shape; the front cover plate (102), the rear cover plate (103), and the upper cover plate (104) are connected and fixed by bolts.

3. A portable, multi-purpose monocular digital image full-field deformation measurement device according to claim 2, characterized in that: A through hole (101) is provided on the front side wall of the front cover plate (102); lighting source mounting holes (105) are respectively provided at both ends of the front side wall of the front cover plate (102); the lighting source mounting holes (105) are located below the through hole (101); and the lighting source (2) is mounted in the lighting source mounting holes (105) and is fixed to the outside of the front side wall of the front cover plate (102) by means of bolts.

4. A portable, multi-purpose monocular digital image full-field deformation measurement device according to claim 2, characterized in that: An external power supply interface (106) and an external communication interface (107) are respectively provided at one end of the rear side wall of the rear cover plate (103); the DC power supply (4021) is connected to an external power supply via the external power supply interface (106); and the computer communication module (403) is connected to a computer via the external communication interface (107).

5. The portable, multi-purpose monocular digital image full-field deformation measurement device according to claim 2 is characterized in that: A direct current power supply (4021), a closed-loop stepping driver (4022), a controller (4023), a computer communication module (403), and a slide module (302) are respectively mounted on the top of the bottom wall of the rear cover plate (103), and the light control module (401) is fixed inside the front side wall of the front cover plate (102) by bolts.

6. The portable, multi-purpose monocular digital image full-field deformation measurement device according to claim 1 is characterized in that: Buffer pads are provided on the inner walls of both ends of the guide rails on the slide module (302).

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