Defect detecting method based on ultrasonic flaw detection

A defect detection and ultrasonic flaw detection technology, which is applied in the processing of detection response signals, the use of sonic/ultrasonic/infrasonic waves for material analysis, measurement devices, etc. question

Active Publication Date: 2019-03-22
XIAN UNIV OF SCI & TECH
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Problems solved by technology

[0008] In addition, when using the sparse decomposition method for signal denoising (also called signal extraction), the essence is to use the matching pursuit algorithm for signal extraction. Because in the matching pursuit algorithm, firstly, the selection of Gabor atoms has no physical meaning, and secondly, if If a wrong Gabor atom is selected in a certain iteration, the subsequent ite

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  • Defect detecting method based on ultrasonic flaw detection

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Embodiment Construction

[0151] like figure 1 A defect detection method based on ultrasonic flaw detection shown includes the following steps:

[0152] Step 1. Ultrasonic echo signal acquisition and synchronous upload: use the ultrasonic flaw detection device 1 to perform ultrasonic detection on the object under test, obtain the ultrasonic echo signal F(t) of the object under test, and transfer the obtained ultrasonic echo signal F(t) t) synchronously transmitted to the data processing device 2;

[0153] in, t represents the time parameter, t i is the i-th sampling moment of the ultrasonic flaw detection device 1, f(t i) is the signal value sampled at the ith sampling time of the ultrasonic flaw detection device 1, i is a positive integer and i=1, 2, 3, ..., N z , N z is a positive integer and it is the signal length of the ultrasonic echo signal F(t);

[0154] Step 2. Determination of peaks and troughs: use data processing equipment 2 to determine all peaks and all troughs of the ultrasonic ec...

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Abstract

The invention discloses a defect detecting method based on ultrasonic flaw detection. The method comprises the following steps: 1, acquiring an ultrasonic echo signal and uploading the ultrasonic echosignal synchronously; 2, determining wave crests and wave troughs; 3, eliminating extreme points; 4, dividing the signal: determining a time interval between every two adjacent extreme points, judging dividing points, determining sampling moments of the dividing points, judging signal division, sorting the dividing points and dividing the signal; 5, judging signal separation and performing signalseparation; and 6, identifying a defect. The method is simple in steps, reasonable in design, convenient to implement and good in using effect; the judgment of the dividing points and the determination of the sampling moments of the dividing points are achieved by performing threshold judgment on the time interval between every two adjacent extreme points, and the ultrasonic echo signal is divided; then signal separation judgment and signal separation are respectively performed on every divided signal, and independent ultrasonic echo signals at multiple defect positions in the same ultrasonicecho signal can be quickly and accurately identified.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic flaw detection, and in particular relates to a defect detection method based on ultrasonic flaw detection. Background technique [0002] Ultrasonic flaw detection (also known as ultrasonic testing or ultrasonic testing) is a non-destructive testing method that uses the difference in acoustic properties of materials and their defects to reflect the reflection of ultrasonic wave propagation and the energy change of penetration time to test the internal defects of materials. The principle of ultrasonic flaw detection is that the transmission loss of ultrasonic waves in solids is very small, and the detection depth is large. Since ultrasonic waves will reflect and refract on heterogeneous interfaces, especially if they cannot pass through gas-solid interfaces, if there are pores, cracks, Defects such as delamination (gas in the defect) or inclusions, when the ultrasonic wave (also called ultrasonic...

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Application Information

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IPC IPC(8): G01N29/44
CPCG01N29/44G01N29/4418G01N29/4445G01N29/4454G01N2291/0234G01N2291/0289
Inventor 齐爱玲
Owner XIAN UNIV OF SCI & TECH
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