Sheet workpiece phased array ultrasonic guided wave imaging detection system and detection method thereof

Abstract

The invention relates to a sheet workpiece phased array ultrasonic guided wave imaging detection system and a detection method of the system. The system comprises a phased array ultrasonic detector, a phased array ultrasonic guided wave probe and a position encoder. The phased array ultrasonic guided wave probe comprises a phased array ultrasonic probe body and an ultrasonic guided wave wedge, an inclined rectangular groove is formed in the vertical side face of the ultrasonic guided wave wedge, the phased array ultrasonic probe body further comprises a probe main body and array wafers, the phased array ultrasonic probe body is installed on the inclined face of the ultrasonic guided wave wedge, the phased array ultrasonic probe body is tightly combined with the ultrasonic guided wave wedge through a coupling agent, and the array wafers are distributed on the inclined face in the depth direction of the inclined rectangular groove. The ultrasonic guided wave wedge and the array wafers are adopted for large-area detection, so that detection efficiency is improved, edges of detection areas are covered with each other in an overlapped mode, and detection results are more accurate; the inclined rectangular groove is formed to generate a coupling monitoring signal and a detection signal which are matched with each other so that defects of sheet workpieces can be judged, and accuracy of the detection results is further improved.

Description

technical field [0001] The invention relates to an ultrasonic detection device, in particular to a thin-plate workpiece phased array ultrasonic guided wave imaging detection system and a detection method thereof. Background technique [0002] For thin-plate workpieces, it is very difficult to use traditional ultrasonic flaw detection methods such as transverse wave oblique incident primary wave and secondary wave flaw detection, or longitudinal wave vertical incident flaw detection, but ultrasonic guided waves are very suitable for large-area rapid detection of thin plate workpieces. The generation mechanism is that the ultrasonic waves reciprocate and reflect repeatedly in a space-limited medium, and further produce complex superposition interference and geometric dispersion. [0003] The key component of guided wave detection is the ultrasonic guided wave probe. The traditional ultrasonic guided wave probe has a single-chip probe structure. The single-chip probe generates ...

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Problems solved by technology

[0003] The key component of the guided wave detection is the ultrasonic guided wave probe. The traditional ultrasonic guided wave probe has a single-chip probe structure. The single-chip probe generates a beam of guided waves. The detection coverage is an acoustic beam line, which is realized by moving the single-chip probe. Due to the coverage of the area, scanning images of a certain area cannot be observed at the same time; or a ring-shaped multi-chip probe is used, and all the chips of the probe are simultaneously excited to generate multiple beams of guided waves to detect within a certain area, but this application is mainly used for pipeline inspection , and the detection generally does not use the phased array focusing method

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