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Optimization preparation method of experiment speckle field

A speckle field and speckle technology, which is applied in the field of photomechanics, can solve the problems of poor speckle accuracy and consistency, and achieve the effect of good consistency, direct and reliable consistent speckle, and easy production

Active Publication Date: 2017-01-04
SOUTHEAST UNIV
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Problems solved by technology

[0004] Technical problem: The present invention provides an experimental speckle field that can solve the problem of poor accuracy and consistency of speckle accuracy in practical applications, realize controllable transfer of high-quality experimental speckle fields, repeatable, controllable precision, and simple production. Optimal preparation method of spot field

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  • Optimization preparation method of experiment speckle field

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Embodiment Construction

[0037] The present invention will be further explained below in conjunction with the embodiments and the drawings of the specification.

[0038] figure 1 It is the flow chart of the present invention, which is mainly divided into three parts (1), (2) and (3). The preparation of the repeatable experimental speckle field with controllable precision and simple operation can be realized according to the following operation steps:

[0039] (1) Computer-generated high-quality digital speckle field:

[0040] a. Generation of digital speckle field:

[0041] First, for any given speckle size d, a regularly arranged speckle field rich in parameter information such as d and rand can be given according to the following formula (such as Figure 2a ):

[0042] x i ′ = π / 2 X d X ( mod ( i / n ) ) , y i ′ = π / 2 X d X ( int ( i / n ) + 1 ) , i A [ 1 , n ]

[0043] Where (x′ i , Y′...

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Abstract

The present invention discloses an optimization preparation method of an experiment speckle field. The method comprises: selecting an optimal digital speckle field according to the computer speckle design program and the speckle quality assessment criterion, employing indirect preparation method such as transfer print (hydrographics transfer printing, heat transfer printing and the like), laser cutting, silk screen printing, photosensitive stamp, hollow template to transfer the integrated information of the digital speckle field to the surface of an object to be measured for providing high-precision and good-consistency speckle field for digital image relation measurement. Through optimization selection and direct transferring of the digital speckle field generated by the computer, the problems are solved that the digital image relation method measurement precision is undetermined caused by unstable quality of the speckle field and the traditional spraying making random speckle field method and others depend on the technicians' operation skill levels so as to ensure the reliability of the digital image relation method in the scientific research and the real engineering measurement.

Description

Technical field [0001] The invention belongs to the technical field of photometric mechanics, and relates to a digital and controllable speckle field generation method suitable for digital image correlation methods. Background technique [0002] Digital image correlation method is a new type of non-contact optical measurement method, which is now used in many disciplines. It uses randomly distributed speckles attached to the surface of the measured object as a carrier, and determines the movement and deformation characteristics of the object by tracking the speckles and analyzing the probability correlation before and after deformation. Therefore, the production of high-quality speckles is a prerequisite for accurate measurement of digital image correlation methods. [0003] However, in practical applications, due to the large differences in speckles produced by different methods or by different personnel, the quality of the actual speckle field is different, and the calculation r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
CPCG01B11/16
Inventor 何小元陈振宁
Owner SOUTHEAST UNIV
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