A Realization Method of Visual Extensometer Based on Digital Speckle

A realization method, digital speckle technology, applied in measuring devices, instruments, optical devices, etc., can solve problems such as the difficulty of making different marks, and achieve the effect of wide application range, high measurement efficiency, and simple spraying work

Active Publication Date: 2016-07-06
新拓三维技术(西安)有限公司
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Problems solved by technology

However, some aspects still need to be further improved. First, the core of the extensometer to measure the strain is the light intensity contrast between the sample and the mark. The greater the contrast, the better the tracking effect of the extensometer. Due to the diversity of sample materials and colors, It brings great difficulty to the production of different marks

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  • A Realization Method of Visual Extensometer Based on Digital Speckle
  • A Realization Method of Visual Extensometer Based on Digital Speckle
  • A Realization Method of Visual Extensometer Based on Digital Speckle

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] The present invention proposes a digital speckle-based visual extensometer implementation method, the specific operation steps are as follows figure 1 shown. The hardware device structure adopted is as follows: figure 2 As shown, it is mainly composed of 2 CCD cameras, 2 LED lights, 1 controller and 1 computer.

[0026] The first step, speckle and mark preparation: make speckle on the measurement area on the surface of the sample to be tested, and mark two calculation points (that is, the measured points) on the surface of the sample with black cross lines. Preferably, the preparation requirements: (a) the speckle particles sprayed on the surface of the sample should be randomly distributed; (b) the speckle contrast is obvious and should be greater than a predetermined threshold; (c) the speckle preparation range should be larger than the measured d...

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Abstract

The invention discloses a digital speckle-based visual extensometer realization method, the first step is speckle and mark preparation; the second step is binocular camera calibration; the third step is speckle image acquisition; the fourth step is specifying Image sub-area; the fifth step, image correlation matching; the sixth step, three-dimensional coordinate reconstruction; the seventh step, deformation calculation. Through the above operation steps, the implementation method of the digital speckle-based visual extensometer of the present invention can accurately measure the deformation of the material during the tensile test, and has the characteristics of convenient operation, non-contact measurement, and accurate and reliable measurement results.

Description

technical field [0001] The invention belongs to the technical field of machining measurement, and relates to a method for realizing a visual extensometer, in particular to a method for realizing a visual extensometer based on digital speckle. Background technique [0002] With the continuous development of the processing and manufacturing industry, the performance requirements of the processed materials are getting higher and higher, and correspondingly, the detection methods of the material performance are becoming more and more advanced. The measurement of deformation has developed from the past mechanical measurement to optical non-contact measurement. When the mechanical contact knife-edge extensometer measures the deformation of the material during stretching, the friction between the knife-edge and the measured piece will produce relative motion (slip), which affects the accuracy of the measurement results. The non-contact video extensometer is produced on the basis o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/16
Inventor 唐正宗李磊刚卢岗
Owner 新拓三维技术(西安)有限公司
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