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Structural damage identification method based on laser television holographic technique

A holographic technology, a technology for structural damage, applied in the direction of optical testing flaws/defects, etc., can solve problems such as limiting wide application, and achieve the effect of improving calculation accuracy, simplifying damage identification process, and reducing the interference of test noise.

Inactive Publication Date: 2011-06-01
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
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Problems solved by technology

However, if a good prediction effect is to be achieved, a large amount of reliable experimental data needs to be collected to fully train the prediction model, which limits the wide application of this method to a large extent.

Method used

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  • Structural damage identification method based on laser television holographic technique
  • Structural damage identification method based on laser television holographic technique

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Embodiment Construction

[0023] In order to make the technical means, creative features, goals and effects of the present invention easy to understand, the present invention will be further elaborated below in conjunction with the examples.

[0024] like figure 1 As shown, the flow of the damage identification method of the present invention starts at step 100, and at step 200 a training sample set of speckle interference fringe images with a lossless structure is established.

[0025] The pixel value of the speckle interference fringe image is expressed as:

[0026] Val pixel =Acos(θ)J 0 (2πK·δ) (1)

[0027] Among them, A is the intensity of the object light field and the reference light field, which is a normally distributed random quantity; θ is the optical phase difference between the object light field and the reference light field, a random quantity uniformly distributed between (0, 2π); J 0 is the zero-order Bessel function, K is the sensitivity vector, and δ is the displacement amplitude ...

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Abstract

The invention relates to a structural damage identification method based on a laser television holographic technique. The invention discloses a structural damage detecting method comprising the following steps: acquiring speckle interference fringe images of a nondestructive structure, constructing a group of interference fringe images of the nondestructive structure reflecting measurement noise, constructing a damage detection network model by a support vector machine sorting algorithm, and sorting and comparing unknown images to judge whether damage occurs and the position of damage. The method provided by the invention is suitable for structural damage detection, can improve damage identification accuracy, simplify the damage identification process and realize intellectualization in judging structural defects.

Description

technical field [0001] The invention relates to the field of structural damage identification, in particular to a structural damage detection method based on laser television holographic testing technology. Background technique [0002] Laser TV-Holography (Laser TV-Holography) technology is a non-contact full-field real-time measurement technology. Due to its advantages of strong versatility, high measurement accuracy, wide frequency range and simple measurement, it has been widely used in vibration testing and damage detection in recent years. developed rapidly. [0003] The basic principle of the application of laser TV holography technology to damage detection is: under the action of external load, the outer surface of the structural damage will produce non-uniform deformation, and there will be obvious abnormalities in the regular speckle interference fringes. Continuous, abrupt shape changes and spacing changes, etc., so that structural defects and their locations can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
Inventor 刘龙于建川
Owner SHANGHAI MARITIME UNIVERSITY
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