Multilayer buried pipeline leakage source locating device and method based on acoustic emission inspection

Abstract

The invention belongs to the field of pipeline detection, and particularly relates to a multilayer buried pipeline leakage source locating device and method based on acoustic emission inspection. The locating device is characterized in that a first waveguide rod and a second waveguide rod are fixed to the two sides of a leakage source respectively; the lower end of a first piezoelectric acceleration sensor and the lower end of a second piezoelectric acceleration sensor are bonded to the surfaces of the first waveguide rod and the second waveguide rod respectively; the upper end of the first piezoelectric acceleration sensor and the upper end of the second piezoelectric acceleration sensor are connected with a first preamplifier and a second preamplifier respectively through wires; then signals are transmitted to a first data acquisition module and a second data acquisition module; the signals are transmitted to an A / D converter through the two data acquisition modules to be converted to digital signals; the A / D converter transmits the digital signals to a host, and the host determines the position of the leakage source of a pipeline finally. According to the multilayer leakage source locating method, local locating and accurate locating are combined, local locating based on signal amplitude damping is adopted, accurate locating of the pipeline leakage source under a complex working condition is achieved finally based on acoustic emission inspection, and the method is suitable for locating of leakage of the pipeline under a buried condition.

Description

Technical field [0001] The invention belongs to the field of pipeline detection, and in particular relates to a method for multi-level positioning of leakage points of buried pipelines under non-excavation inspection, in particular to a multi-level positioning device and method for buried pipeline leakage sources based on acoustic emission detection . Background technique [0002] Pipeline transportation occupies an important position in the global transportation of energy materials (including crude oil, refined oil, natural gas, oilfield associated gas, etc.), becoming the fifth largest transportation industry after railway, highway, water transportation, and air transportation. With the development of pipeline transportation industry, the appearance of pipeline leakage and the losses caused by leakage have brought opportunities for development of pipeline leakage detection. [0003] Because the acoustic emission signal collected when the pipeline leaks is very complex, it includ...

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Problems solved by technology

[0005] The pipeline is buried in the soil, and when the pipeline leaks, the leakage material penetrates through the soil to the ground surface. In order to overcome the defect that the existing technology cannot accurately locate the leakage location, the present invention provides a multi-level location of pipeline leakage based on acoustic emission detection. Device and method capable of realizing accurate positioning of buried pipelines without excavation

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