Multicoil ultrasonic guided-wave device of arbitrary frequency, and guided wave excitation method and receiving method thereof

Abstract

The invention belongs to the technical field of nondestructive test, and more specifically relates to a multicoil ultrasonic guided-wave device of arbitrary frequency, and a guided wave excitation method and a guided wave receiving method thereof. The multicoil ultrasonic guided-wave device is used for nondestructive test of metal sheets and pipes, and comprises a multichannel excitation and receiving circuit device, a magnet, a magnetic induced contraction band, and a multicoil subassembly. The guided wave excitation method comprises following steps: 1, the arrangement manner of the transmitting multicoil subassembly is determined; 2, the type of guided wave is selected; 3, the frequency dispersion curve of guided wave in a piece to be tested is calculated; 4, guided wave mode and working points thereof are selected; 5, the phase difference of excitation current in the coils are calculated; 6, drive pulse is generated based on calculate results obtained in step 4, and ultrasonic guided-wave is transmitted. The guided wave receiving method comprise following steps: 1, the combination arrangement manner of the receiving multicoil is determined; 2, the type of guided wave is selected; 3, the frequency dispersion curve of guided wave in the piece to be tested is calculated; 4, the type, mode, and working points of guided wave are selected; 5, the phase difference of each coil in signal receiving is calculated; and 6, phase shift and superposition of the receiving signals of the coils are realized.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and in particular relates to a multi-coil ultrasonic guided wave device of any frequency and a guided wave excitation and receiving method thereof, which are used for non-destructive testing of metal plates and pipe fittings. Background technique [0002] With the rapid development of my country's national economy, the demand for plates and pipe fittings has gradually increased. However, during the production and use of plates and pipe fittings, defects such as inclusions, cracks, and corrosion will occur, causing potential safety hazards. Therefore, regular non-destructive testing or long-term online monitoring can not only improve economic benefits, but also avoid accidents. [0003] Among many non-destructive testing technologies, the non-contact electromagnetic ultrasonic transducer uses the principle of electromagnetic induction to directly excite ultrasonic waves on the sur...

AI Technical Summary

Problems solved by technology

Therefore, the problems of low transduction efficiency of the existing ultrasonic guided wave device and single guided wave type, mode and operating frequency for transducer excitation are solved.

[0005] In order to solve the above-mentioned technical problems, the present invention belongs to the technical field of non-destructive testing, and specifically relates to a multi-coil ultrasonic waveguide device of any frequency, including a multi-channel excitation and receiving circuit device, a magnet, a magnetostrictive band and a multi-coil combination, which solves the problem of The existing ultrasonic guided wave device has low transducing efficiency, and the guided wave type, mode and operating frequency of transducer excitation are single.

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