Magnetostrictive guide wave damage-free detection method

A magnetostrictive, defect-free technology, applied in the direction of material analysis using sonic emission technology, which can solve problems such as difficulty, low detection accuracy, and single-mode guided waves.

Inactive Publication Date: 2008-02-20
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

The above technologies are mainly carried out around piezoelectric ultrasonic guided waves, mainly focusing on how to obtain guided waves with a single mode
Since the magnetostrictive guided wave is difficult to o

Method used

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  • Magnetostrictive guide wave damage-free detection method
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  • Magnetostrictive guide wave damage-free detection method

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0022] As shown in Figure 1, the inventive method comprises the following steps:

[0023] (1) The excitation unit and the receiving unit of the magnetostrictive guided wave sensor are respectively installed on the non-defective standard sample member, and the induced electrical signal of the receiving unit is collected, and the collection duration is T 0 , to obtain the measurement signal X of a set of non-defective standard samples 0 , where T 0 The value of is determined by the member length and detection range, such as according to the detection requirements, T 0 The value range can be between 2ms and 200ms.

[0024] (2) Take the measurement signal X 0 The maximum value or minimum value of the induction signal of the guided wave passing through the receiving unit for the first time is used as the starting point of the data, and the interce...

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Abstract

The utility model relates to a non-destructive examination method for the magnetostriction guided wave, which belongs to the technical field of non-destructive examination; wherein, a group of signals are extracted respectively from the zero defects signals of standard samples and the actual detection signals as reference signals and detection signals according to definite length and starting point of the data. The method one is that: a group of signals are acquired via the difference between the detection signals and the reference signals; defects are detected by judging whether the signals are deformed or not; the loss amounts of the section surface of tested members are measured by using the peak-to-peak value of the signals according to the linear relationship between the peak-to-peak value of the defect signals and the loss amounts of the section surface of the tested members. The method two is that: a group of signals are acquired via the difference between the square of the detection signals and the reference signals; defects are examined by judging whether the signals are deformed or not. The originally indistinguishable signals of small defects are processed into signals with easily distinguishable defects through the signal processing method, thus realizing the examination of minor defects defying examination and greatly enhancing the precision of measurement.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a nondestructive testing method for magnetostrictive guided waves. Background technique [0002] Ultrasonic guided wave technology has the advantages of single-point excitation and can detect a certain distance. It has been widely used in the industry in recent years. For example, the invention patent application with application number 200310123047.9 discloses a non-destructive inspection device using guided Invention inspection method (disclosure date is February 2, 2005); application number is 200610072881.3 invention patent application discloses a method for guided wave detection of liquid-filled pipeline with viscoelastic coating (disclosure date is September 6, 2006 No.); the invention patent application with application number 200610144294.0 discloses an ultrasonic guided wave time-reversal detection device and method for pipeline defects (public...

Claims

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Application Information

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IPC IPC(8): G01N29/14
Inventor 武新军徐江王良云康宜华
Owner HUAZHONG UNIV OF SCI & TECH
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