Remote pipeline imaging method and system based on guided wave gathered scanning

Abstract

The invention discloses a remote pipeline imaging method and system based on guided wave gathered scanning, relating to the technical fields of ultrasonic measurement and pipeline systems. Electric energy is converted into sound energy by utilizing a transducer to send an ultrasonic signal, amplitude modulation is realized through a circuit, and a time sequence is added into a transducer array in an algorithm, so that different time delays are realized. Sound signals excited by transducer arrays with different time delays and amplitude values are mutually acted and combined, and a maximum characteristic reflected signal is obtained in a special propagation direction and distance, i.e., focusing is realized; and then, the amplitude value and the time delay are continuously changed through the algorithm and the circuit so that the focusing position is changed, multiple focusing is realized at different positions, and an image is constructed through combination. According to the invention, the ultrasonic signal is excited by the transducer so that higher excitation energy, longer detection distance, higher precision and more accuracy in location are realized.

Description

technical field [0001] The invention is a long-distance pipeline imaging method and system based on guided wave focusing scanning. The field of measurement and piping technology involving ultrasound. Background technique [0002] Thousands of long pipelines are located all over the world, many of which suffer from problems such as corrosion due to long periods of service, and material anomalies in in-service pipelines can lead to catastrophic failures. Therefore, regular testing of pipeline integrity has become an indispensable guide for maintaining these pipelines. [0003] In the past few decades, phased array focused scanning has received considerable attention in non-destructive testing (NDT). Most phased array equipment uses bulk waves by changing bulk waves into guided waves, because guided waves The energy is confined to the boundary and can travel long distances along the boundary, making it possible to test entire structures such as steel plates and steel pipes. ...

AI Technical Summary

Problems solved by technology

But the excitation voltage they use is low, so the detection distance is very short

CN1521503A discloses an all-digital phased array ultrasonic non-destructive testing system and method, which conducts beam focus scanning detection on the detection area, digitally and accurately determines the focused sound beam scanning scheme and the position of the defect reflection source, but cannot focus multiple times and detect The distance is short, and the accuracy and positioning are still not accurate enough

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