Nonlinear ultrasonic guided wave detection method and device for pipeline micro damage

A non-linear ultrasonic and detection method technology, which is applied in the direction of using sound wave/ultrasonic wave/infrasonic wave to analyze solids, etc. It can solve complex signal processing problems, achieve high sensitivity, reduce instrument nonlinear interference, and ensure stable pressure.

Inactive Publication Date: 2014-08-06
XIAMEN UNIV
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Problems solved by technology

Chinese document CN 102866202 A discloses a method for non-linear ultrasonic guided wave time-reversal detection of pipeline micro-crack accumulation areas, using non-linear third harmonics for detection, and its signal processing is more complicated

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  • Nonlinear ultrasonic guided wave detection method and device for pipeline micro damage
  • Nonlinear ultrasonic guided wave detection method and device for pipeline micro damage
  • Nonlinear ultrasonic guided wave detection method and device for pipeline micro damage

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[0029] Example: see Figure 1 to Figure 3 A non-linear ultrasonic guided wave detection device for pipeline micro-damage, comprising an excitation / reception unit 1 for ultrasonic guided wave signals, an impedance device 2, an excitation transducer 3, a receiving transducer 4, and a receiving preamplifier (power amplifier 5), filter 6, oscilloscope 7, in which the excitation / reception unit 1 of the signal excites an ultrasonic signal of a certain frequency, passes through the impedance 2 to reduce noise and connects the developed excitation transducer 3 to the tested specimen N through the coupling agent , the other end of the test piece is connected to the receiving transducer 4 to detect the propagated guided wave signal, and after being filtered by the amplifier 5, it is sent to the oscilloscope 7, and the signal is averaged 1000 times in the oscilloscope 7 to improve the signal-to-noise ratio. storage. The stored signals are further analyzed on the oscilloscope 7, or analy...

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Abstract

The invention discloses a nonlinear ultrasonic guided wave detection method and a nonlinear ultrasonic guided wave detection device for pipeline micro damage. An exciting transducer capable of exciting single guided wave modal state and a matched receiving transducer are adopted, the transducers can wind a pipeline to excite axisymmetric modal states, the receiving efficiency of a second order harmonic signal is improved by a matching and corresponding receiving probe, the detection capacity of the system on second order harmonic waves of the guided waves is improved. The nonlinear change of a material is characterized by detecting the ratio of nonlinear response to propagation distance, nonlinear interference of instruments is effectively reduced, nonlinear ultrasonic guided wave evaluation of the pipeline material is realized, and nonlinear ultrasonic high sensitivity can be used for early detection of the pipeline micro defects.

Description

technical field [0001] The invention discloses a non-linear ultrasonic guided wave detection method and device for pipeline micro-damage, which belongs to the technical field of non-destructive testing according to the International Patent Classification (IPC). Linear response detects microscopic defects inside structural materials. Background technique [0002] Ultrasonic guided waves can conduct large-area, rapid and overall detection of the conductor to be tested. This detection method can not only detect the surface defects of the sample, but also detect and evaluate the internal damage of the sample. Guided wave detection technology is also an effective method for detecting inaccessible or concealed areas in structural components. In addition, guided waves are widely used as an effective detection method because of their flexible excitation and detection methods and the ability to carry a large amount of information required for detection. In the pipeline, the energy...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/07
Inventor 李卫彬秦晓旭胡诗诚
Owner XIAMEN UNIV
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