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IVMD and energy estimation combined DSPI phase filtering method

A technology of phase filtering and energy estimation, which is applied in the direction of phase impact characteristic measurement, calculation, and measurement devices, which can solve the problems of inability to obtain phase information, inability to process noise, and lack of self-adaptability, so as to improve phase accuracy information and avoid Parameter setting, the effect of improving the signal-to-noise ratio

Active Publication Date: 2018-04-13
TIANJIN UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Both Gabor filtering and wavelet threshold denoising methods filter out interference noise by manually setting the threshold, which is not adaptive and cannot obtain accurate phase information; the empirical mode decomposition method has modal aliasing, over-envelope, Shortcomings such as under-envelope cannot effectively deal with noise

Method used

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  • IVMD and energy estimation combined DSPI phase filtering method
  • IVMD and energy estimation combined DSPI phase filtering method
  • IVMD and energy estimation combined DSPI phase filtering method

Examples

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Embodiment 1

[0040] A DSPI phase filtering method combining IVMD and energy estimation, see figure 1 , the DSPI phase filtering method comprises the following steps:

[0041] 101: Collecting the DSPI phase diagram, estimating the number of decomposed mode components according to the length and width of the phase diagram, and extracting the optimal mode number by using the orthogonal index;

[0042] 102: Perform variational modal decomposition on the DSPI phase diagram according to the number of decomposed components to obtain a series of modal function components, that is, frequency modulation and amplitude modulation components;

[0043] 103: Calculate the energy of the FM and AM components, and use the energy of the decomposed components to estimate the energy of the noise component;

[0044] 104: Analyzing the curve change diagram of the energy logarithm value and the number of modal components, extracting the noise-free component, and obtaining the filtered DSPI phase diagram.

[004...

Embodiment 2

[0062] The following is combined with specific calculation formulas, examples, Figure 2-Figure 4 The scheme in Example 1 is further introduced, see the following description for details:

[0063] 201: Combine figure 2 Build a digital speckle interferometry system, and use the CCD camera in the digital speckle interferometry system to collect the DSPI phase images of the measured disc before and after deformation;

[0064] The detailed operation of this step is:

[0065] Build a digital speckle interferometry system, which is composed of CCD camera, imaging lens, laser and so on.

[0066] Among them, the optical path of the measurement system is as follows: figure 2 As shown, the laser light emitted by the laser is divided into two beams of light by the beam splitter. One beam of light illuminates the surface of the measured object, and the other beam of light is transmitted along the optical fiber through the coupling lens as the object light. , Imaging lens, form speck...

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Abstract

An IVMD and energy estimation combined DSPI phase filtering method comprises the following steps: the mode quantity after decomposition is preset in the VMD technology decomposition process, the number of mode components after the decomposition is estimated according to the length and the width of a phase diagram, and an optimal mode quantity is selected by using an orthogonal index; variational mode decomposition is carried out on a DSPI phase diagram according to the optimal mode quantity to obtain a series of mode function components which are frequency modulation and amplitude modulation components; the energy of the frequency modulation and amplitude modulation components is calculated, and the energy of the component after the decomposition is used to estimate the energy of noise components; and a curve change graph between the energy log value and the mode component quantity is analyzed, and noiseless components are extracted to obtain a filtered DSPI phase diagram. The method avoids the problem of setting the mode number in the VMD decomposition process on the premise of a large amount of noises contained in a speckle phase diagram, and uses the IVMD to perform filtering processing on pictures to remove noise interference in order to obtain accurate phase measurement information.

Description

technical field [0001] The invention relates to the fields of laser non-destructive testing and optical image processing, in particular to a DSPI phase filtering method combining IVMD (Improved variational mode decomposition) and energy estimation. Background technique [0002] In recent years, with the development of aerospace, various composite materials have been widely used. However, due to defects such as deformation and displacement during the processing, manufacturing and service of these composite materials, the performance of the components is significantly reduced, and the service time is reduced. For this reason, it is necessary to test and evaluate these composite materials, provide solutions for subsequent emergency repairs, and ensure the healthy operation of aerospace equipment. [0003] Studies have shown that when the surface of an object irradiated by coherent light is deformed or displaced, the deformation of the object surface is transformed into a phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88G01N21/45G01B11/16G01B11/02G06T5/00G06T5/10G06T5/20
CPCG06T5/10G06T5/20G01B11/02G01B11/162G01N21/45G01N21/8851G01N2021/8887G06T5/70
Inventor 肖启阳李健曾周末
Owner TIANJIN UNIV
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