Aluminum plate defect detection-based ultrasonic guided-wave focused transducer

Abstract

The invention discloses an aluminum plate defect detection-based ultrasonic guided-wave focused transducer which comprises fan-shaped periodic permanent magnet bodies, grid coils and a detected aluminum plate, wherein the fan-shaped periodic permanent magnet bodies are of fan-shaped structures disposed in a manner of staggered polarities and having fixed spacing; the grid coils are of structures where a current direction and a coil closely winding direction are homocentric and homodromous; the grid coils are wound on the fan-shaped periodic permanent magnet bodies; the detected aluminum plateis located under the fan-shaped periodic permanent magnet bodies and the grid coils. By the adoption of a novel transducer structure, the ultrasonic guided-wave focused transducer enables limited ultrasonic energy to be subjected to signal focusing at a certain specific position of interest, so as to precisely extract a measurement signal and analyze a defect to achieve aims of efficient inspection and flexible detection of defects on the surface of the aluminum plate.

Description

technical field [0001] The invention relates to the technical field of nondestructive testing, in particular to an ultrasonic guided wave focusing transducer based on aluminum plate defect detection. Background technique [0002] Sheet metal is widely used in industrial production, and it is also an important structure that constitutes a variety of important industrial facilities. However, during the long-term operation of the metal plates in these devices, medium corrosion, material aging, geological disasters, external impacts and accidents will inevitably cause defects. If the inspection and repair are not carried out in time, it will have a great negative impact on the safe and stable operation of these devices, which will easily lead to medium leakage, even fire and explosion, resulting in serious environmental pollution, economic losses and even casualties. In order to find the defects in the metal sheet in time, take measures to avoid accidents, and maintain its safe...

AI Technical Summary

Problems solved by technology

At present, the SH guided wave electromagnetic ultrasonic transducer based on omnidirectional transceiver and directional transceiver has been widely used in the actual detection of metal sheet defects, but due to the inherent low energy conversion efficiency of EMAT, there are still problems in defect identification and signal extraction. Therefore, there is an urgent need for an energy-focused electromagnetic ultrasonic transducer to improve defect detection methods and improve detection efficiency

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