Structured light-based two-dimensional DIC optical extensometer out-of-plane compensation device and method
A technology of optical extensometer and compensation device, applied in the direction of using optical device, measurement device, calculation, etc., can solve the problem of low measurement accuracy, and achieve the effect of improving measurement accuracy
Inactive Publication Date: 2020-07-17
UNIV OF SCI & TECH OF CHINA
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When the measurement surface has out-of-plane displacement (including out-of-plane translation and out-of-plane rotation) or the optical axis of the camera is installed non-perpendicular to the measurement surface, the 2D-DIC method will produce false strains, making the final measurement accuracy low
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[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0046] As mentioned in the background technology, the basic principle of the 2D-DIC method is to use a fixed camera to capture digital images of the plane specimen before and after deformation, and by matching the images before and after deformation, the pixel deformation information of the measurement surface of the specimen can be obtained. Therefore, the 2D-DIC method can only measure the in-plane displacement of planar specimens. When the measurement surfa...
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The invention provides a structured light-based two-dimensional DIC optical extensometer out-of-plane compensation device and method. A light source device irradiates a calibration surface of a calibration plate and a measurement surface of a test piece; a structured light projection device projects structured light to the calibration surface; after a camera acquires a calibration image of the calibration surface and a calibration light bar image of the corresponding light bar of the calibration surface projected by the structured light, the structured light projection device projects the structured light to the measurement surface, and the camera acquires a speckle image of the measurement surface and a light bar image of the corresponding light bar of the measurement surface projected bythe structured light; and the image processing device calibrates the camera and the structured light according to the calibration image and the calibration light bar image to obtain an internal parameter, an external parameter and a structured light plane equation of the camera, and substitutes the light bar image into the structured light plane equation to obtain out-of-plane displacement so asto compensate pseudo-strain. According to the technical scheme provided by the invention, pseudo strain generated by out-of-plane displacement and non-vertical installation of the optical axis can becompensated, and the measurement precision is improved.
Description
technical field [0001] The present invention relates to the fields of experimental mechanics and optical detection, and more specifically relates to a two-dimensional DIC (Digital Image Correlation, Digital Image Correlation) optical extensometer out-of-plane compensation device and method based on structured light. Background technique [0002] After nearly 40 years of research, 3D-DIC using two cameras has made great progress and is relatively mature in theory and technology. However, 3D-DIC still has some inherent disadvantages, such as relatively complex optical system, mis-matching of corresponding points of binocular cameras, expensive hardware cost, and cumbersome camera calibration, etc. In order to reduce hardware costs, some scholars combine 2D-DIC technology and fringe projection technology, and use a fringe projector instead of one of the cameras to realize 3D-DIC. However, the fringe projection method requires a time-consuming and complicated dephasing process,...
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IPC IPC(8): G01B11/16G06T7/80
CPCG01B11/16G01B11/167G06T2207/10004G06T7/80
Inventor 翟超李慧汪连坡顾永刚
Owner UNIV OF SCI & TECH OF CHINA