Nonlinear ultrasonic phased array imaging method for micro-crack detection

An ultrasonic phased array and phased array technology, which is applied in the analysis of solids using sonic/ultrasonic/infrasonic waves, can solve the problems of limited detection range, lack of nonlinear ultrasonic imaging methods, limited spatial average value, etc.

Inactive Publication Date: 2015-10-28
BEIJING UNIV OF TECH
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Problems solved by technology

However, the current nonlinear ultrasonic measurement results are either limited to spatial averages, or implicitly localized through cumbersome imaging, and lack effective nonlinear ultrasonic imaging methods
At the same time, these

Method used

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  • Nonlinear ultrasonic phased array imaging method for micro-crack detection
  • Nonlinear ultrasonic phased array imaging method for micro-crack detection
  • Nonlinear ultrasonic phased array imaging method for micro-crack detection

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Experimental program
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Embodiment Construction

[0037] The effectiveness of the method of the present invention will be described in detail below using the data obtained from the detection experiment.

[0038] The test system used is figure 1 As shown, the linear array phased array probe used in the experiment, the model is 5L-32A5, and its parameters are shown in Table 1. The test piece such as Figure 4 As shown, the material is steel, the size is 240mm×47mm×25mm, there is a 20mm long wire-cut notch in the middle, and a fatigue crack with a length of about 9mm is processed at the top of the wire-cut by a fatigue testing machine, so the crack tip is 20mm away from the testing surface. The center frequency of the excitation signal is 5MHz, and the sampling frequency is 16.6MHz.

[0039] Table 1 Basic parameters of the probe

[0040]

[0041] Step 1: Use the ultrasonic phased array detection system to collect detection signals in the sequential focus and parallel focus modes;

[0042] (1) will be as figure 1 The ultr...

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Abstract

The invention relates to a nonlinear ultrasonic phased array imaging method for micro-crack detection. According to the method, an ultrasonic phased array detection system is utilized to collect the detection signals in the sequence focusing mode and the parallel focusing mode, the appropriate receiving delay tr and the width T of the time-domain intercepting window are determined, the intercepted detection signals are subjected to Fourier transform, the sound kinetic energies Es and Ep of the sequence focusing method and the parallel focusing method and the relative energy difference gamma of the two focusing methods are respectively calculated, and the nonlinear source position is determined according to the gamma, ie., the micro-defect position.

Description

technical field [0001] The invention belongs to the field of nondestructive testing, and in particular relates to a nonlinear ultrasonic phased array imaging method, which is used for detecting and identifying nonlinear sources (such as fatigue cracks). Background technique [0002] During long-term service, the structure will gradually age under the effects of fatigue load, impact, corrosion, high temperature and other environmental factors, showing different degrees of damage. Among them, the fatigue crack is an unstable defect, which has the greatest potential harm to the structure. Under the action of external factors, fatigue cracks may expand rapidly and cause the structure to break suddenly. Therefore, it is very important to take effective measures to realize the early detection and location of structural fatigue cracks to ensure the normal operation of major infrastructure and the safety of people's lives and property. [0003] Nonlinear ultrasonic technology is h...

Claims

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Application Information

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IPC IPC(8): G01N29/06
Inventor 焦敬品马婷杨素方何存富吴斌
Owner BEIJING UNIV OF TECH
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