Unlock instant, AI-driven research and patent intelligence for your innovation.

Reconfiguration optimization method of phased-array ultrasonic image based on frequency domain compression perception

A frequency domain compression, ultrasonic image technology, applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, material analysis using sonic/ultrasonic/infrasonic waves, and processing response signals of detection, etc., which can solve problems such as large amount of data

Inactive Publication Date: 2018-08-24
TIANJIN UNIV
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a phased array ultrasonic image reconstruction optimization method based on frequency-domain compressed sensing. The present invention aims at the problem of huge amount of data in ultrasonic phased array defect detection, and uses the Orthogonal Matching Pursuit (OMP) algorithm to The experimental image of the artificial defect echo is compressed and reconstructed, and the superiority of the frequency domain method is proved by comparing the reconstruction effect with the time domain compressed sensing. See the description below for details:

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Reconfiguration optimization method of phased-array ultrasonic image based on frequency domain compression perception
  • Reconfiguration optimization method of phased-array ultrasonic image based on frequency domain compression perception
  • Reconfiguration optimization method of phased-array ultrasonic image based on frequency domain compression perception

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] An embodiment of the present invention provides a phased array ultrasonic image reconstruction optimization method based on frequency domain compressed sensing, see figure 1 , the method includes the following steps:

[0041] 101: Build an ultrasonic phased array defect detection experimental system to obtain the echo image reflected by the defect position of the test piece for subsequent analysis;

[0042] 102: Select the discrete Fourier basis as the sparse basis for frequency-domain compressive sensing of ultrasonic phased array defect images, construct a random Gaussian matrix as the sensing matrix for frequency-domain compressive sensing of ultrasonic phased array defect images, and select the orthogonal matching pursuit algorithm Ultrasonic phased array defect frequency domain images are reconstructed; the compression rate is defined as the ratio of the compressed signal length to the original signal length, and the peak signal-to-noise ratio is selected to quanti...

Embodiment 2

[0050] Combine below Figure 1-Figure 6 , specific examples, and calculation formulas further introduce the scheme in Embodiment 1, see the following description for details:

[0051] 201: Build an ultrasonic phased array defect detection experimental system, and obtain the echo image reflected by the defect position of the test piece 5 for subsequent analysis;

[0052] The detailed operation of this step is:

[0053] 1) Build an ultrasonic phased array defect detection system, which includes: host computer 1, ultrasonic phased array detector 2, ultrasonic phased array transducer 3, resin wedge 4, test piece 5, the detection system is as follows: figure 2 As shown, the defect settings are as image 3shown. Among them, the material of the tested part 5 is aluminum, which contains artificially processed through-hole defects with a diameter of 1mm, and the horizontal and vertical distances between the defects are both 10mm.

[0054] 2) The target area is detected by linear s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a reconfiguration optimization method of a phased-array ultrasonic image based on frequency domain compression perception; the reconfiguration optimization method is as follows: an ultrasonic phased-array defect detection experimental system is constructed, and an echo image reflected by a defect position of a to-be-tested part is obtained; a discrete Fourier transform baseis used as a sparse matrix of the frequency-domain compression perception of an ultrasonic phased-array defect image, a random gaussian matrix as a sensing matrix of the frequency-domain compressionperception of the ultrasonic phased-array defect image is constructed, and an orthogonal matching pursuit algorithm is selected for reconfiguration of the ultrasonic phased-array defect frequency-domain image; the compression ratio is a ratio of a compressed signal length to an original signal length, and a peak signal to noise ratio is selected to quantitatively evaluate the accuracy of a reconstruction algorithm; the original defect echo image is subjected to frequency domain transform and compression reconstruction, and reconstruction errors under different sampling rates and compression rates are calculated; and by comparing the reconstruction result of frequency domain compression perception of the image and time domain conditions, the optimization effect is evaluated. The frequency domain compression perception is used in the field of compression reconstruction of the phased-array ultrasonic image, and a good effect is obtained.

Description

technical field [0001] The invention relates to the field of ultrasonic phased array image compression, in particular to a phased array ultrasonic image reconstruction optimization method based on frequency domain compressed sensing. Background technique [0002] As a unique non-destructive testing technology, ultrasonic phased array testing technology has been widely used in aerospace, national defense, nuclear industry, railway, machinery manufacturing and petrochemical industries. [1] . In particular, its unique deflection and focusing characteristics and three working modes of linear scanning, sectoral scanning and dynamic focusing provide convenient conditions for the detection of complex structures and composite materials. [0003] The first step in phased array detection is the digital sampling of the analog signal, so it is limited by the Nyquist sampling theorem, that is, in order to avoid aliasing, the sampling rate must be more than twice the highest frequency, p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/06G01N29/44
CPCG01N29/069G01N29/4409G01N2291/023
Inventor 白志亮陈世利贾乐成曾周末
Owner TIANJIN UNIV