Prism speckle monocular real-time measurement method suitable for three-dimensional deformation

Abstract

The invention discloses a prism speckle monocular real-time measurement method suitable for three-dimensional deformation, which can be used for deformation measurement of a material surface in industrial manufacturing, and comprises the following steps: determining the position of a prism; acquiring an image of the calibration plate; solving internal and external parameters of the camera; speckles are sprayed on the tested material; speckle patterns before and after deformation are collected; speckle images are matched, feature points are described through BEBLID detection, and stereo matching three-dimensional reconstruction is completed; deformation parameters are calculated. Measurement and display of three-dimensional deformation of the workpiece surface are achieved through the single camera and the prism, and the device is low in cost and suitable for a narrow space; in addition, the problem that images collected by a binocular camera are not synchronous can be solved, and the method is very suitable for a high-speed camera shooting image to-be-processed site.

Description

technical field [0001] The invention belongs to the technical fields of engineering materials, optical mechanics and deformation measurement, and relates to a prism speckle monocular real-time measurement method suitable for three-dimensional deformation. Background technique [0002] In recent years, with the continuous development of science and technology and the continuous expansion of people's living needs, new materials in various fields have emerged in an endless stream. The mechanical properties of materials have a great influence on the engineering use of materials. The most important thing is deformation measurement. Three-dimensional micro-deformation measurement of materials can be used for strain deformation measurement of large oil pipelines, concrete mechanical performance tests, etc. to analyze the degree of micro-deformation of materials, and can predict The safety performance and service life of materials in various engineering scenarios provide a theoretic...

AI Technical Summary

Problems solved by technology

[0003] Existing methods for measuring material deformation include traditional methods such as resistance strain gauges, extensometers, etc., which are pasted on the surface of the specimen to observe the deformation of the area of ​​interest in the material, but they can only measure the material one by one. Point measurement cannot obtain full-field data, so it is impossible to measure excessive deformation; in recent years, optical-based deformation measurement methods include photoelasticity, laser holographic interferometry, etc., which need to use laser as a light source and the optical path is complicated and difficult to arrange, and the measurement results are easily affected. External influence, convenient for research in the laboratory, but for the actual engineering site, its application is limited

[0004] The three-dimensional deformation (out-of-plane displacement) of the material requires a binocular camera to shoot. However, for some small spaces, the binocular camera is bulky. In addition, the binocular camera has the problem of asynchronous shooting and high equipment cost

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