New enginering structure and material deformation measuring technology

A technology for engineering structure and material deformation, applied in the direction of analyzing materials, optical testing flaws/defects, instruments, etc., can solve the problem of inapplicability of large deformation measurement

Inactive Publication Date: 2003-11-26
TIANJIN UNIV
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Problems solved by technology

Compared with electrical measurement, this method has the advantages of non-contact, simple optical path and avoiding fringe processing. However, the mathematical basis of this method is based on the theory of small deformation, which is not applicable to the measurement of larger deformation.
The above methods have certain

Method used

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  • New enginering structure and material deformation measuring technology
  • New enginering structure and material deformation measuring technology
  • New enginering structure and material deformation measuring technology

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Embodiment Construction

[0008] The carrier of the deformation information is the feature point, which must first be extracted or prepared on the surface of the measured object.

[0009] The following is attached figure 1 Describe the measurement process of this technique. The light source (1) and the CCD camera (2) are adjusted to obtain clear video signals of feature points, and the three-dimensional mobile platform (3) is adjusted so that the normal direction of the measured object is perpendicular to the axis of the CCD camera (2). Before the object is deformed, the feature point images on the surface of the object are taken by the CCD camera, and the taken images are transmitted to the control computer (4), and converted into digital images by the analog-to-digital conversion of the image acquisition card in the computer, and stored in the computer to form data files. During the detection process, all instruments and equipment cannot be moved. With the deformation of the object, the image acquis...

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Abstract

The present invention provides the characteristic point analyzing and distinguishing technology for accurate measurement of deformation in engineering structure and material. The new measurement technology adopts light source, CCD camera, 3D shift stage, control computer and analysis and distinguishing system. On the surface of the tested object, several "characteristic points" for describing the structural deformation are made or selected, their images before and after deformation or in different deformation stages are taken via the CCD camera and the obtained video signals are transmittedinto the control computer and formed into data files. The "characteristic points" relevant coefficient judgment criterions are used in the measurement of object deformation. The present invention may be used in engineering site measurement, has no special limitation in measured object and deformation causes, and may be used in the measurement of various mechanical performance of different materials.

Description

technical field [0001] The invention relates to a measurement technology for engineering structure and material deformation in the field of optical mechanical image analysis. Background technique [0002] It is a problem that many engineering fields may encounter to measure the deformation of the structure or material surface in the engineering field under the action of some reason. Commonly used methods are electrical measurement and mechanical measurement, both of which are contact point measurement methods. At present, electrical measurement is the most widely used method, and close-range testing is done through lead wires. In addition to certain restrictions on the degree of deformation, this method cannot be used for displacement measurement of rigid bodies. In recent years, optical testing technology has developed rapidly, such as interference optical methods, which have higher requirements on the experimental environment, such as shockpr...

Claims

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Application Information

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IPC IPC(8): G01N21/88G01N35/00
Inventor 亢一澜王怀文张志锋富东慧
Owner TIANJIN UNIV
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