Pipeline axial ultrasonic guided wave energy exchange probe

Abstract

The invention relates to a pipeline axial ultrasonic guided wave energy exchange probe, which is characterized in that the pipeline axial ultrasonic guided wave energy exchange probe comprises a premagnetized nickel-iron alloy sheet and a plurality of groups of coil belts, wherein the nickel-iron alloy sheet is tightly fixed on the outer wall of a pipeline to be detected in the circumferential direction of the pipeline to be detected, the rest magnetic flux density on the nickel-iron alloy sheet is distributed along the circumferential direction of the pipeline to be detected, a plurality of groups of coil belts are a plurality of groups of coil belts formed by winding a conducting wire on the premagnetized nickel-iron alloy fixed on the outer wall of the pipeline to be detected, the two adjacent groups of coils have the same center distance, and in addition, the two adjacent groups of coils have the opposite winding directions. A pulse power amplifier is connected with the starting end of the conducting wire for winding a plurality of groups of coil belts, and the tail end of the conducting wire for winding a plurality of groups of coil belts is sequentially connected with a wave filter amplification circuit and an oscilloscope. The invention can be widely applied to the field of nondestructive detection of the pipeline.

Description

technical field [0001] The invention relates to a pipeline non-destructive testing device, in particular to a pipeline axial ultrasonic guided wave transducer probe used in the pipeline non-destructive testing device. Background technique [0002] It is an effective way to use axial ultrasonic guided waves to detect defects such as welds and circumferential cracks on the pipeline to be tested. The existing ultrasonic transducers for exciting and receiving axial ultrasonic guided waves generally use piezoelectric transducers. Its detection principle is: when the axial ultrasonic guided wave propagates in the pipeline to be tested and encounters a weld or a circumferential crack on the pipeline to be tested, the axial ultrasonic guided wave is reflected immediately, and the excitation of the axial ultrasonic guided wave The end receives the reflected axial ultrasonic guided wave, and calculates the product of the time difference between excitation and reception of the axial ul...

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Problems solved by technology

[0003] The existing piezoelectric transducer probe needs to grind the outer wall of the pipeline to be tested before use, so it is very inconvenient to use, and the amplitude of the axial ultrasonic guided wave excited by it is small, the propagation distance is short, and the detection is difficult. The length range of the pipe to be tested is limited

In the published literature "Magnetostrictive Effect Excitation of Longitudinal Guided Wave in Circular Tube" (Publication Date: 2005.10, Journal Number: ISSN: 0577-6686) has disclosed a The structure of the electromagnetic ultrasonic transducer probe based on the principle of hysteresis stretching, the transducer probe can excite and receive the axial ultrasonic guided wave on the ferromagnetic material pipeline, although the amplitude of the axial ultrasonic guided wave is relatively large, and the propagation distance is long However, because it can only be used to detect ferromagnetic materials in the pipeline to be tested, the application range of this transducer probe is narrow, and it is necessary to install an external magnetic field such as an electromagnet or a permanent magnet to make this transduction probe The structure of the probe is relatively complicated and inconvenient to use, so it needs to be improved

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