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Digital speckle-based high-speed three-dimensional strain measurement method

A technology for strain measurement and speckle quality evaluation. It is applied in the field of strain measurement and can solve the problems of limiting high-speed three-dimensional strain measurement, inability to obtain image sensors, and clear and synchronized speckle images.

Active Publication Date: 2015-08-26
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, this method needs to describe fine standard grids or grid lines on the surface of the measured object, which has certain limitations in practical applications. In addition, for objects with high-speed deformation, ordinary image sensors cannot obtain clear and synchronized speckle images. , become a barrier to limit high-speed three-dimensional strain measurement

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[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0032] Such as figure 1As shown, a typical high-speed three-dimensional strain measurement system includes a workstation 1 , a timing synchronization system 2 , a first high-speed image sensor 3 and a second high-speed image sensor 4 . The first high-speed image sensor 3 and the second high-speed image sensor 4 are connected to the timing synchronization system 2 for taking images of the measur...

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Abstract

The invention discloses a digital speckle-based high-speed three-dimensional strain measurement method. According to the method, a high-speed image acquisition system is adopted to acquire high-speed deformation objects; the quality of speckle images is evaluated through utilizing speckle particle size mean or gray scale gradient of the images; the images have high correlation and high quality in a measurement process assuredly, and the accuracy of measurement can be effectively improved; and therefore, real-time continuous three-dimensional reconstruction and strain measurement can be performed on measured objects in deformation according to the image sequence of the deformation objects which are acquired quickly, and three-dimensional strain measurement of the high-speed deformation objects can be realized finally.

Description

technical field [0001] The invention belongs to the technical field of strain measurement, and more specifically relates to a high-speed three-dimensional strain measurement method based on digital speckle. Background technique [0002] With the rapid development of material science and measurement technology, high-speed strain measurement technology has more and more extensive application prospects in many fields. In the field of experimental mechanics, this technology can be used to perform high-speed tensile tests on the sheet metal, and then obtain the strain information and mechanical parameters of the sheet metal under high-speed tensile state, which is of great significance for the fatigue experiment of materials; in the field of vehicle engineering, This technology can be used to measure and monitor the high-speed deformation information of the car body during the automobile crash test, helping relevant technicians to improve the structural design and improve the saf...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01B11/25
Inventor 李中伟刘行健钟凯
Owner HUAZHONG UNIV OF SCI & TECH
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