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Multi-scale digital image correlation measurement method

A digital image and related measurement technology, which is applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems of poor accuracy and stability, difficult operation, etc.

Inactive Publication Date: 2021-05-28
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] Aiming at the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a multi-scale digital image correlation measurement method to solve the problems of difficult operation, poor precision and stability in the multi-scale speckle production process in the prior art; the present invention Used in conjunction with a multi-scale digital image correlation system to ensure that the digital speckle field at each scale corresponds to the optimal digital speckle field at that scale in the measurement system, so as to meet the measurement requirements of different resolution scales and improve the multi-scale performance of objects or components. Measurement accuracy and efficiency

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[0032] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.

[0033] refer to Image 6 As shown, a kind of multi-scale digital image correlation measurement method of the present invention, the steps are as follows:

[0034] 1) Create a multi-scale digital speckle field;

[0035] 2) Build a multi-band / multi-spectral digital image correlation measurement system;

[0036] 3) Calculate the deformation field at each scale.

[0037] The multi-scale in the present invention refers to multiple measurement scales, multiple measurement dimensions, and multiple measurement resolutions.

[0038] The multi-scale measurement in the present invention refers to the high-precision and high-efficiency measurement that the same object to be measured can still maintai...

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Abstract

The invention discloses a multi-scale digital image correlation measurement method. The method comprises the following steps: 1) making a multi-scale digital speckle field; 2) constructing a multiband / multispectral digital image correlation measurement system, and collecting each speckle pattern; 3) calculating the deformation field of each scale. The method is used in combination with a multi-scale digital image related system, it is guaranteed that the digital speckle field of each scale corresponds to the optimal digital speckle field under the scale in a measurement system, the measurement requirements of different resolution scales are met, and the precision and efficiency of multi-scale measurement of objects or components are improved.

Description

technical field [0001] The invention belongs to the technical field of experimental solid mechanics, and the invention relates to the digital image correlation measurement under different resolution scales (scale) and the optimized production of the repeatable digital speckle field, as well as the multi-scale digital speckle field produced by using this optimization. The digital image correlation measurement performed by the spot field specifically refers to a multi-scale digital image correlation measurement method. Background technique [0002] Digital Image Correlation (DIC) is a new non-contact optical measurement method, which is now applied in many disciplines. It uses speckles randomly distributed on the surface of the measured object as the carrier, and determines the motion and deformation information of the object by tracking the speckles and analyzing the probability correlation before and after deformation. Speckle as a measurement information carrier is divided...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16G01B11/00
CPCG01B11/162G01B11/00
Inventor 陈振宁孙伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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