Supersonic guide-wave time reversion detection apparatus and method for defect of pipeline

A time-reversal, ultrasonic guided wave technology, used in pipeline systems, mechanical equipment, gas/liquid distribution and storage, etc., can solve problems such as limiting the flexibility of guided wave detection methods, difficulty in waveform identification, and difficulty in small defect identification.
CN1978977AActive Publication Date: 2007-06-13BEIJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING UNIV OF TECH
Publication Date
2007-06-13

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Abstract

The invention relates to pipeline defect ultrasound guided wave time reversal detection device and method. The method includes the following steps: selecting detecting frequency according to the detected pipeline corresponding free hollow column structure group velocity dispersion curve; inputting the frequency into the arbitrary function generator to generate center frequency used as single sound signal; sending the signal to each passage of exciting / receiving set to transducer unit; exciting longitudinal axis symmetry guided wave modal; sending the reflected signal to the computer and gaining reversal excitation signal by time reversal; repeatedly exciting guided signal to detect. The invention realize space and time focus for guided wave detection, greatly improve detection capability for little defect.
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Description

technical field

[0001] The invention relates to an ultrasonic guided wave time-reversal detection device and method for pipeline defects, belonging to the field of non-destructive testing. Background technique

[0002] As an important part of production systems, transportation and manufacturing equipment, pipelines play an irreplaceable role in industries such as machinery, petroleum, chemical, food and urban water supply. However, after the pipeline has been in service for a long time, pipeline leakage due to corrosion, wear, accidental damage and other reasons occurs from time to time, causing great losses to the country and the people. Therefore, it is imminent to vigorously develop pipeline detection technology.

[0003] Ultrasonic guided wave has the characteristics of small attenuation along the propagation path and long propagation distance. The detection signal can also contain the overall information from the excitation point to the receiving point. It is very suit...

Claims

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