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Global optimal ultrasonic signal denoising method

An ultrasonic signal, global optimal technology, applied in the recognition of patterns in signals, instruments, characters and pattern recognition, etc., can solve the problems of long running time, large amount of calculation and high algorithm complexity

Active Publication Date: 2021-05-11
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these algorithms are complex, computationally intensive, and run for a long time.

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Embodiment Construction

[0041] Such as Figure 1 to Figure 2 As shown, a global optimal ultrasonic signal denoising method of the present invention comprises the following steps:

[0042] Step 1. Acquisition and storage of the ultrasonic echo signal: the ultrasonic echo signal f(t) is acquired by the signal acquisition device 1, and the ultrasonic echo signal f(t) is stored in the computer 2, and the ultrasonic echo signal f(t) is obtained by the signal acquisition device 1 The wave signal f(t) is the signal to be processed and f(t)=[f(t 1 ), f(t 2 ),...,f(t n ),...,f(t N )], where n is the sampling moment number and n=1,2,...,N, N is the length of the signal, f(t n ) for f(t) at t n The sampling point at time ;

[0043] During actual implementation, make the standard defect test block 3, the shape of the standard defect test block 3 is a cuboid, its length and width are 5D, and the standard defect test block 3 has a height range of λ is the wavelength of ultrasonic waves in the test block 3 ...

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Abstract

The invention discloses a global optimal ultrasonic signal denoising method. The method comprises the following steps: 1, acquiring and storing an ultrasonic echo signal; and 2, de-noising the ultrasonic echo signal: to be specific, 201, performing sparse decomposition based on parameter optimization; 202, searching for an optimal time-frequency parameter; and 203, performing iteration stop condition judgment. The sparse decomposition method based on parameter optimization is adopted to find the optimal matching atom, the self-adaptive iteration stop condition and the self-adaptive search step length are combined, the signal-to-noise ratio of the denoised signal can be effectively improved, the denoising speed is increased, meanwhile, the tripping parameter is introduced, so that the situation that fruit fly optimization depends on the position of the optimal taste concentration selected through iteration each time is avoided, the optimal taste concentration is sunk into local optimum, the searching ability is improved, and the error of reconstructed signals is small.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic signal denoising, and in particular relates to a globally optimal ultrasonic signal denoising method. Background technique [0002] In ultrasonic testing, the ultrasonic probe can convert the electrical signal into an ultrasonic signal, and transmit it to the material to be tested through the coupling agent. When the ultrasonic wave encounters a defect during the propagation process, reflection and refraction will occur. By analyzing the echo, the position and size of the defect can be estimated. However, in actual testing, when ultrasonic waves propagate inside the material, they will interact with defects, interfaces, boundaries, etc., resulting in transmission, scattering and other phenomena that lead to problems such as energy attenuation and mode conversion, resulting in a large amount of noise in the echo, making it difficult to detect defects. The echo is separated, which affects the ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06N3/00
CPCG06N3/006G06F2218/04
Inventor 董明李敬
Owner XIAN UNIV OF SCI & TECH