CN-224232199-U - Digital image measurement and analysis system

CN224232199UCN 224232199 UCN224232199 UCN 224232199UCN-224232199-U

Abstract

The utility model provides a digital image measurement analysis system which comprises a material testing machine, an image acquisition module, an illumination module, a signal triggering device and a computer, wherein the material testing machine comprises a device base at the bottom, the image acquisition module is arranged at the front side of the material testing machine, the illumination module is symmetrically distributed at the left side and the right side of the image acquisition module, the distance between the left illumination module and the right illumination module is equal to the width of the device base, the digital image measurement analysis system further comprises a workbench used for placing the material testing machine, the signal triggering device and the computer, the setting height of the image acquisition module and the illumination module is not more than the total height of the material testing machine and the workbench, and the material testing machine, the image acquisition module, the illumination module and the computer are all connected with the signal triggering device in a wired mode. The digital image measurement analysis system can realize high-quality image acquisition, can control illumination conditions, and can realize high-precision real-time linkage among all modules by matching with a signal trigger device.

Inventors

ZHENG WEIFENG
Yu Haini
ShangGuan Ronghai
CHEN Jin
ZHENG PENG
Zheng Shangbang
HUANG WEIPING

Assignees

厦门市计量检定测试院

Dates

Publication Date: 20260512
Application Date: 20250520

Claims (8)

1. The digital image measurement analysis system is characterized by comprising a material testing machine, an image acquisition module, an illumination module, a signal triggering device and a computer, wherein the material testing machine comprises a device base at the bottom, the image acquisition module is arranged at the front side of the material testing machine, the illumination modules are symmetrically distributed at the left side and the right side of the image acquisition module, the distance between the illumination modules is equal to the width of the device base, the digital image measurement analysis system further comprises a workbench used for placing the material testing machine, the signal triggering device and the computer, the setting height of the image acquisition module and the illumination module is not more than the total height of the material testing machine and the workbench, and the material testing machine, the image acquisition module, the illumination module and the computer are all connected with the signal triggering device in a wired mode.
2. The measurement analysis system according to claim 1, wherein the total height of the material testing machine and the workbench is H, and the setting heights of the image acquisition module and the illumination module are 0.8H-H.
3. The measurement analysis system of claim 1, wherein the image acquisition module comprises a binocular CCD camera and a camera mount, the binocular CCD camera is detachably connected to a top end of the camera mount, and the binocular CCD camera is located on a front side central axis of the material testing machine.
4. A measurement analysis system according to claim 3, wherein the top end of the camera support is provided with a laterally directed transverse mounting bar, and the binocular CCD camera is positioned at the midpoint of the transverse mounting bar.
5. The measurement analysis system of claim 4, wherein the illumination module comprises a first LED light source and a second LED light source, and the first LED light source and the second LED light source are symmetrically arranged on two sides of the binocular CCD camera and detachably connected with the transverse mounting rod.
6. The measurement analysis system of claim 5, wherein the first LED light source and the second LED light source each comprise a light source housing and a light source plate disposed in the light source housing, and the surface of the light source plate is provided with an LED array comprising a plurality of LED light beads.
7. The measurement analysis system of claim 1, further comprising a dimmer for adjusting the intensity of illumination of the lighting module, the dimmer being electrically connected to the lighting module.
8. The measurement analysis system of claim 1, wherein the signal triggering device is a DAQ controller.

Description

Digital image measurement and analysis system Technical Field The utility model relates to the technical field of digital image detection, in particular to a digital image measurement and analysis system. Background In the field of research on mechanical properties of materials, digital image measurement and analysis systems are widely used because of the advantages of non-contact type, full-field strain measurement and the like. However, the system in the prior art still has the following limitations that 1. The measurement dimension of an image acquisition module is single, most systems adopt a monocular camera to acquire two-dimensional images, only displacement information in the surface of a material can be acquired, accurate measurement of out-of-plane displacement cannot be realized based on a parallax principle, and the requirement of three-dimensional deformation field analysis is difficult to meet, 2. The illumination stability and suitability of an illumination module are insufficient, the traditional light source is mostly in single-side or asymmetric layout, shadows or light reflection are easily generated on the surface of a test piece, illumination parameters (such as wavelength and brightness) cannot be flexibly adjusted according to the reflection characteristics of the material (such as different reflectances of metal and composite materials), so that the image acquisition quality is unstable and the characteristic identification precision of a digital image correlation method (DIC) is influenced, 3. The synchronous control precision among devices is insufficient, the traditional trigger mechanism is difficult to realize load loading, microsecond grade synchronization of image acquisition and light source control, mechanical data and image sequence space-time misplacement at the moment of material deformation is easy to cause errors of deformation field analysis results. Therefore, the application aims to develop a digital image measurement analysis system with comprehensive measurement dimension, controllable illumination condition and high synchronization precision. Disclosure of utility model The utility model provides a digital image measurement and analysis system for solving the problems existing in the prior art. The application provides a digital image measurement analysis system which comprises a material testing machine, an image acquisition module, an illumination module, a signal triggering device and a computer, wherein the material testing machine comprises a device base at the bottom, the image acquisition module is arranged at the front side of the material testing machine, the illumination module is symmetrically distributed at the left side and the right side of the image acquisition module, the distance between the left illumination module and the right illumination module is equal to the width of the device base, the digital image measurement analysis system further comprises a workbench used for placing the material testing machine, the signal triggering device and the computer, the setting height of the image acquisition module and the illumination module is not more than the total height of the material testing machine and the workbench, and the material testing machine, the image acquisition module, the illumination module and the computer are all connected with the signal triggering device in a wired mode. Through adopting above-mentioned technical scheme to the top surface of device base is experimental plane, utilizes the material testing machine to carry out external load to the material that awaits measuring and applys (including stretching, compression, crooked etc.), and synchronous control between each equipment can be realized to signal triggering device, when the material testing machine applys external load to the material, the synchronous transmission of trigger signal to image acquisition module and lighting module, ensures in the twinkling of an eye that the material takes place to warp, lighting module lights experimental plane with even stable light, and image acquisition module then carries out continuous high definition shooting to the material surface deformation process with the frame rate of settlement, and the image data of gathering passes through wired communication real-time transmission to the computer. Preferably, the total height of the material testing machine and the workbench is H, and the setting height of the image acquisition module and the lighting module is 0.8H-H. Through adopting above-mentioned technical scheme, because the material testing machine applys the height of load and is different according to the kind of applys the load, consequently image acquisition module, lighting module's setting height need be adjusted according to actual scene, set up to 0.8H ~ H and can cover most load and applys the scene. Preferably, the image acquisition module comprises a binocular CCD camera and a camera support, the binocular CCD camera