Single-channel bidirectional receiving and transmitting ultrasonic guided wave pipeline monitoring system and imaging method

Abstract

The invention discloses an ultrasonic guided wave array pipeline defect imaging detection system and an imaging method. The system has the advantages of being long in monitoring distance, simple in structure, low in power consumption and high in imaging precision. The method comprises the steps that firstly, one annular excitation sensor array and two annular receiving sensor arrays are arranged on a pipeline, the annular receiving sensor arrays are located at the two sides of the annular excitation sensor array and receive ultrasonic guided wave signals bidirectionally and simultaneously, bidirectional simultaneous monitoring of the annular excitation sensor array is realized, the monitoring distance is greatly prolonged, and system cost is lowered; secondly, array elements of the annularexcitation sensor array sequentially perform excitation, the annular receiving sensor arrays at the two sides receive the ultrasonic guided wave signals sequentially and cyclically, it is only neededto maintain operation of one excitation array element and two receiving array elements in the monitoring process, hardware configuration of the system is simplified, operation is performed in a low-power-consumption state, and long-time online monitoring is realized; and thirdly, a pipeline monitoring region is imaged through collected full-matrix data in combination with full-waveform inversion,synthetic aperture focusing, full focusing and other algorithms, and positioning and quantitative monitoring of pipeline corrosion and other defects are realized.

Description

technical field [0001] The present invention relates to the technical field of ultrasonic guided wave detection, and more specifically, to a single-channel, two-way transmitting and receiving ultrasonic guided wave pipeline monitoring system and imaging method. Background technique [0002] As one of the five mainstream means of transportation, pipelines play a pivotal role in the transportation of liquid, gas, two-phase flow and other goods. Pipeline transportation has the advantages of high efficiency, stability, and safety, and is widely used in oil, natural gas, and chemical fields. After decades of development, my country has formed a pipeline transportation network that runs from north to south and across east and west, which greatly coordinates the uneven distribution of energy and promotes the coordinated development of the eastern and western economies. However, pipelines are exposed to various environments all the time, and various forms of damage are going on, su...

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Problems solved by technology

CN201510398585.1 describes the ultrasonic detection device and method for thick-walled pipelines. By using the flat probe for detecting axial defects and the directional probe for detecting circumferential defects at the same time, it can reduce the defect detection rate and improve dete...

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