Novel single-camera three-dimensional digital image correlation system using light combining prism

Abstract

The invention relates to a full-target surface single-camera three-dimensional digital image correlation measurement system and method using an X-cube prism and a single color camera. The system comprises an X-cube prism (4), a lighting source (2), a plane mirror (3), a color camera (5), a light barrier (1) and a computer (6); the plane mirror reflects light from different perspectives into the X-cube prism (4), the prism separates the colors of the light and combines the light into a beam of light, the beam of light enters a target surface of the camea through a lens, and the camera collectsbinocular stereo images with separated color channels. The matching of images of different color channels is performed by using the traditional 3D-DIC algorithm to obtain parallax error data of red and blue images, and the three-dimensional shape, displacement and deformation of a measured object are obtained. The full-target surface single-camera three-dimensional digital image correlation measurement system provided by the invention has a compact structure, the system parameters can be easily adjusted, the stereoscopic imaging quality is high, when experiments of three-dimensional shape anddeformation are performed in special fields such as microscopy and high speed and the like, the high-precision three-dimensional measurement can be completed more conveniently and efficiently.

Description

technical field [0001] The invention relates to the field of photomechanics, in particular to a method for measuring three-dimensional shape, displacement and deformation based on digital image correlation. Background technique [0002] At present, the non-contact optical measurement method of 3D digital image correlation (3DDigital Image Correlation, 3D-DIC) is generally used to measure the three-dimensional shape, displacement and deformation of the object. This technique typically uses two or more synchronized cameras for measurement. However, the system based on multiple cameras still has some shortcomings in the actual use process: the use of multiple cameras will increase the cost exponentially; and multiple cameras must be strictly synchronized, requiring complex synchronization trigger devices and technologies; The characteristics of the cameras will not be exactly the same, and the differences will make the DIC calculation difficult. These issues are especially ac...

AI Technical Summary

Problems solved by technology

However, the system based on multiple cameras still has some shortcomings in the actual use process: the use of multiple cameras will increase the cost exponentially; and multiple cameras must be strictly synchronized, requiring complex synchronization trigger devices and technologies; The characteristics of the cameras will not be exactly the same, and their differences will make the DIC calculation difficult

However, the above single-camera 3D-DIC solutions based on diffraction, refraction and reflection all have an important deficiency: these methods all image in different areas of the same target surface, and achieve single-camera 3D-DIC measurement at the expense of the spatial resolution of the camera target surface

However, in the scheme, the blue and green channels have been transmitted twice, the energy attenuation is high, and the lighting requirements are very high.

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